/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.felix.scr.impl.manager;
import java.security.Permission;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.felix.scr.impl.BundleComponentActivator;
import org.apache.felix.scr.impl.config.ReferenceManager;
import org.apache.felix.scr.impl.helper.BindMethod;
import org.apache.felix.scr.impl.helper.BindMethods;
import org.apache.felix.scr.impl.helper.BindParameters;
import org.apache.felix.scr.impl.helper.Coercions;
import org.apache.felix.scr.impl.helper.MethodResult;
import org.apache.felix.scr.impl.metadata.ReferenceMetadata;
import org.apache.felix.scr.impl.metadata.ReferenceMetadata.ReferenceScope;
import org.apache.felix.scr.impl.metadata.ServiceMetadata.Scope;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServicePermission;
import org.osgi.framework.ServiceReference;
import org.osgi.service.component.ComponentConstants;
import org.osgi.service.component.ComponentException;
import org.osgi.service.log.LogService;
/**
* The <code>DependencyManager</code> manages the references to services
* declared by a single <code><reference></code element in component
* descriptor.
*/
public class DependencyManager<S, T> implements ReferenceManager<S, T>
{
// the component to which this dependency belongs
private final AbstractComponentManager<S> m_componentManager;
// Reference to the metadata
private final ReferenceMetadata m_dependencyMetadata;
private final int m_index;
private final Customizer<S, T> m_customizer;
//only set once, but it's not clear there is enough other synchronization to get the correct object before it's used.
private volatile BindMethods m_bindMethods;
//reset on filter change
private volatile ServiceTracker<T, RefPair<S, T>> m_tracker;
// the target service filter string
private volatile String m_target;
// the target service filter
private volatile Filter m_targetFilter;
private volatile int m_minCardinality;
/**
* Constructor that receives several parameters.
* @param dependency An object that contains data about the dependency
* @param index index of the dependency manager in the metadata
*/
DependencyManager( AbstractComponentManager<S> componentManager, ReferenceMetadata dependency, int index )
{
m_componentManager = componentManager;
m_dependencyMetadata = dependency;
m_index = index;
m_customizer = newCustomizer();
m_minCardinality = defaultMinimumCardinality( dependency );
// dump the reference information if DEBUG is enabled
if ( m_componentManager.isLogEnabled( LogService.LOG_DEBUG ) )
{
m_componentManager
.log(
LogService.LOG_DEBUG,
"Dependency Manager {0} created: interface={1}, filter={2}, policy={3}, cardinality={4}, bind={5}, unbind={6}",
new Object[]
{ getName(), dependency.getInterface(), dependency.getTarget(), dependency.getPolicy(),
dependency.getCardinality(), dependency.getBind(), dependency.getUnbind() }, null );
}
}
private static int defaultMinimumCardinality(ReferenceMetadata dependency)
{
return dependency.isOptional()? 0: 1;
}
int getIndex()
{
return m_index;
}
/**
* Initialize binding methods.
*/
void initBindingMethods(BindMethods bindMethods)
{
m_bindMethods = bindMethods;
}
private interface Customizer<S, T> extends ServiceTrackerCustomizer<T, RefPair<S, T>>
{
/**
* attempt to obtain the services from the tracked service references that will be used in inital bind calls
* before activation.
* @param key TODO
* @return true if there are enough services for activation.
*/
boolean prebind(ComponentContextImpl<S> key);
void close();
Collection<RefPair<S, T>> getRefs( AtomicInteger trackingCount );
boolean isSatisfied();
void setTracker( ServiceTracker<T, RefPair<S, T>> tracker );
void setTrackerOpened();
void setPreviousRefMap( Map<ServiceReference<T>, RefPair<S, T>> previousRefMap );
}
private abstract class AbstractCustomizer implements Customizer<S, T>
{
private final Map<ServiceReference<T>, RefPair<S, T>> EMPTY_REF_MAP = Collections.emptyMap();
private volatile boolean trackerOpened;
private volatile Map<ServiceReference<T>, RefPair<S, T>> previousRefMap = EMPTY_REF_MAP;
public void setTracker( ServiceTracker<T, RefPair<S, T>> tracker )
{
m_tracker = tracker;
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracker reset (closed)", new Object[] {getName()}, null );
trackerOpened = false;
}
public boolean isSatisfied()
{
ServiceTracker<T, RefPair<S, T>> tracker = getTracker();
if ( tracker == null)
{
return false;
}
return cardinalitySatisfied( tracker.getServiceCount() );
}
protected ServiceTracker<T, RefPair<S, T>> getTracker()
{
return m_tracker;
}
/**
*
* @return whether the tracker
*/
protected boolean isActive()
{
return getTracker().isActive();
}
protected boolean isTrackerOpened()
{
return trackerOpened;
}
public void setTrackerOpened()
{
trackerOpened = true;
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracker opened", new Object[] {getName()}, null );
}
protected void deactivateTracker()
{
ServiceTracker<T, RefPair<S, T>> tracker = getTracker();
if ( tracker != null )
{
tracker.deactivate();
}
}
protected Map<ServiceReference<T>, RefPair<S, T>> getPreviousRefMap()
{
return previousRefMap;
}
public void setPreviousRefMap( Map<ServiceReference<T>, RefPair<S, T>> previousRefMap )
{
if ( previousRefMap != null )
{
this.previousRefMap = previousRefMap;
}
else
{
this.previousRefMap = EMPTY_REF_MAP;
}
}
protected void ungetService( RefPair<S, T> ref )
{
Object service = ref.unsetServiceObject(null);
if ( service != null )
{
BundleContext bundleContext = m_componentManager.getBundleContext();
if ( bundleContext != null )
{
bundleContext.ungetService( ref.getRef() );
}
}
}
protected void tracked( int trackingCount )
{
m_componentManager.tracked( trackingCount );
}
}
private class FactoryCustomizer extends AbstractCustomizer {
public RefPair<S, T> addingService( ServiceReference<T> serviceReference )
{
RefPair<S, T> refPair = newRefPair(serviceReference);
return refPair;
}
public void addedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount, int serviceCount )
{
if ( cardinalityJustSatisfied( serviceCount ) )
{
m_componentManager.activateInternal( trackingCount );
}
}
public void modifiedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
}
public void removedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
refPair.setDeleted( true );
if ( !cardinalitySatisfied( getTracker().getServiceCount() ) )
{
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
}
}
public boolean prebind(ComponentContextImpl<S> key)
{
AtomicInteger trackingCount = new AtomicInteger( );
int serviceCount = getTracker().getTracked( true, trackingCount ).size();
return cardinalitySatisfied( serviceCount );
}
public void close()
{
deactivateTracker();
}
public Collection<RefPair<S, T>> getRefs( AtomicInteger trackingCount )
{
return Collections.emptyList();
}
}
private class MultipleDynamicCustomizer extends AbstractCustomizer {
private RefPair<S, T> lastRefPair;
private int lastRefPairTrackingCount;
public RefPair<S, T> addingService( ServiceReference<T> serviceReference )
{
RefPair<S, T> refPair = getPreviousRefMap().get( serviceReference );
if ( refPair == null )
{
refPair = newRefPair(serviceReference);
}
return refPair;
}
public void addedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount, int serviceCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic added {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
boolean tracked = false;
if ( getPreviousRefMap().remove( serviceReference ) == null )
{
if (isActive())
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic already active, binding {2}", new Object[] {getName(), trackingCount, serviceReference}, null );
m_componentManager.invokeBindMethod( DependencyManager.this, refPair, trackingCount );
if ( refPair.isFailed() )
{
m_componentManager.registerMissingDependency( DependencyManager.this, serviceReference, trackingCount );
}
}
else if ( isTrackerOpened() && cardinalityJustSatisfied( serviceCount ) )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic, activating", new Object[] {getName(), trackingCount}, null );
tracked( trackingCount );
tracked = true;
m_componentManager.activateInternal( trackingCount );
}
else
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic, inactive, doing nothing: tracker opened: {2}, optional: {3}", new Object[] {getName(), trackingCount, isTrackerOpened(), isOptional()}, null );
}
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic added {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
if ( !tracked )
{
tracked(trackingCount);
}
}
public void modifiedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic modified {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
if (isActive())
{
m_componentManager.invokeUpdatedMethod( DependencyManager.this, refPair, trackingCount );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic modified {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
tracked( trackingCount );
}
public void removedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic removed {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
refPair.setDeleted( true );
boolean unbind = cardinalitySatisfied( getTracker().getServiceCount() );
if ( unbind )
{
if ( isActive() )
{
m_componentManager.invokeUnbindMethod( DependencyManager.this, refPair, trackingCount );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic removed (unbind) {2}", new Object[] {getName(), trackingCount, serviceReference}, null );
tracked( trackingCount );
}
else
{
lastRefPair = refPair;
lastRefPairTrackingCount = trackingCount;
tracked( trackingCount );
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
lastRefPair = null;
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleDynamic removed (deactivate) {2}", new Object[] {getName(), trackingCount, serviceReference}, null );
}
ungetService( refPair );
}
public boolean prebind(ComponentContextImpl<S> key)
{
int serviceCount = 0;
AtomicInteger trackingCount = new AtomicInteger( );
SortedMap<ServiceReference<T>, RefPair<S, T>> tracked = getTracker().getTracked( true, trackingCount );
for (RefPair<S, T> refPair: tracked.values())
{
if (getServiceObject( key, m_bindMethods.getBind(), refPair ))
{
serviceCount++;
}
else
{
m_componentManager.registerMissingDependency( DependencyManager.this, refPair.getRef(), trackingCount.get() );
}
}
return cardinalitySatisfied( serviceCount );
}
public void close()
{
AtomicInteger trackingCount = new AtomicInteger( );
for ( RefPair<S, T> ref : getRefs( trackingCount ) )
{
ungetService( ref );
}
deactivateTracker();
}
public Collection<RefPair<S, T>> getRefs( AtomicInteger trackingCount )
{
if ( lastRefPair == null )
{
ServiceTracker<T, RefPair<S, T>> tracker = getTracker();
if (tracker == null) {
trackingCount.set( lastRefPairTrackingCount );
return Collections.emptyList();
}
return getTracker().getTracked( null, trackingCount ).values();
}
else
{
trackingCount.set( lastRefPairTrackingCount );
return Collections.singletonList( lastRefPair );
}
}
}
private class MultipleStaticGreedyCustomizer extends AbstractCustomizer {
public RefPair<S, T> addingService( ServiceReference<T> serviceReference )
{
RefPair<S, T> refPair = newRefPair(serviceReference);
return refPair;
}
public void addedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount, int serviceCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticGreedy added {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
tracked( trackingCount );
if (isActive())
{
m_componentManager.log( LogService.LOG_DEBUG,
"Dependency Manager: Static dependency on {0}/{1} is broken", new Object[]
{getName(), m_dependencyMetadata.getInterface()}, null );
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
m_componentManager.activateInternal( trackingCount );
}
else if ( isTrackerOpened() && cardinalityJustSatisfied( serviceCount ) )
{
m_componentManager.activateInternal( trackingCount );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticGreedy added {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
}
public void modifiedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticGreedy modified {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
if (isActive())
{
m_componentManager.invokeUpdatedMethod( DependencyManager.this, refPair, trackingCount );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticGreedy modified {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
tracked( trackingCount );
}
public void removedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticGreedy removed {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
refPair.setDeleted( true );
tracked( trackingCount );
if ( isActive() )
{
//deactivate while ref is still tracked
m_componentManager.log( LogService.LOG_DEBUG,
"Dependency Manager: Static dependency on {0}/{1} is broken", new Object[]
{getName(), m_dependencyMetadata.getInterface()}, null );
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
//try to reactivate after ref is no longer tracked.
m_componentManager.activateInternal( trackingCount );
}
else if ( !cardinalitySatisfied( getTracker().getServiceCount() ) ) //may be called from an old tracker, so getTracker() may give a different answer
{
m_componentManager.log( LogService.LOG_DEBUG,
"Dependency Manager: Static dependency on {0}/{1} is broken", new Object[]
{getName(), m_dependencyMetadata.getInterface()}, null );
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
}
//This is unlikely
ungetService( refPair );
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticGreedy removed {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
}
public boolean prebind(ComponentContextImpl<S> key)
{
int serviceCount = 0;
AtomicInteger trackingCount = new AtomicInteger( );
final ServiceTracker<T, RefPair<S, T>> tracker = getTracker();
SortedMap<ServiceReference<T>, RefPair<S, T>> tracked = tracker.getTracked( cardinalitySatisfied( tracker.getServiceCount() ), trackingCount );
for (RefPair<S, T> refPair: tracked.values())
{
if ( getServiceObject( key, m_bindMethods.getBind(), refPair ) )
{
serviceCount++;
}
else
{
m_componentManager.registerMissingDependency( DependencyManager.this, refPair.getRef(),
trackingCount.get() );
}
}
return cardinalitySatisfied( serviceCount );
}
public void close()
{
AtomicInteger trackingCount = new AtomicInteger( );
for ( RefPair<S, T> ref: getRefs( trackingCount ))
{
ungetService( ref );
}
deactivateTracker();
}
public Collection<RefPair<S, T>> getRefs( AtomicInteger trackingCount )
{
ServiceTracker<T, RefPair<S, T>> tracker = getTracker();
if (tracker == null) {
return Collections.emptyList();
}
return tracker.getTracked( null, trackingCount ).values();
}
}
private class MultipleStaticReluctantCustomizer extends AbstractCustomizer {
private final AtomicReference<Collection<RefPair<S, T>>> refs = new AtomicReference<Collection<RefPair<S, T>>>();
private int trackingCount;
public RefPair<S, T> addingService( ServiceReference<T> serviceReference )
{
RefPair<S, T> refPair = newRefPair(serviceReference);
return refPair;
}
public void addedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount, int serviceCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticReluctant added {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
tracked( trackingCount );
if ( isTrackerOpened() && cardinalityJustSatisfied( serviceCount ) && !isActive())
{
m_componentManager.activateInternal( trackingCount );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticReluctant added {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
}
public void modifiedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticReluctant modified {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
Collection<RefPair<S, T>> refs = this.refs.get();
if (isActive() && refs.contains( refPair ))
{
m_componentManager.invokeUpdatedMethod( DependencyManager.this, refPair, trackingCount );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticReluctant modified {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
tracked( trackingCount );
}
public void removedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticReluctant removed {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
refPair.setDeleted( true );
tracked( trackingCount );
Collection<RefPair<S, T>> refs = this.refs.get();
if ( isActive() && refs != null )
{
if (refs.contains( refPair ))
{
//we are tracking the used refs, so we can deactivate here.
m_componentManager.log( LogService.LOG_DEBUG,
"Dependency Manager: Static dependency on {0}/{1} is broken", new Object[]
{ getName(), m_dependencyMetadata.getInterface() }, null );
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
// FELIX-2368: immediately try to reactivate
m_componentManager.activateInternal( trackingCount );
}
}
else if ( !cardinalitySatisfied( getTracker().getServiceCount() ) )
{
m_componentManager.log( LogService.LOG_DEBUG,
"Dependency Manager: Static dependency on {0}/{1} is broken", new Object[]
{getName(), m_dependencyMetadata.getInterface()}, null );
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
}
ungetService( refPair );
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} MultipleStaticReluctant removed {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
}
public boolean prebind(ComponentContextImpl<S> key)
{
int serviceCount = 0;
Collection<RefPair<S, T>> refs = this.refs.get();
if (refs != null) {
//another thread is concurrently opening, and it got done already
for (RefPair<S, T> refPair: refs)
{
if (getServiceObject( key, m_bindMethods.getBind(), refPair ))
{
serviceCount++;
}
}
return cardinalitySatisfied( serviceCount );
}
refs = new ArrayList<RefPair<S, T>>();
AtomicInteger trackingCount = new AtomicInteger( );
SortedMap<ServiceReference<T>, RefPair<S, T>> tracked = getTracker().getTracked( true, trackingCount );
for (RefPair<S, T> refPair: tracked.values())
{
if (getServiceObject( key, m_bindMethods.getBind(), refPair ))
{
serviceCount++;
}
refs.add(refPair) ;
}
if ( this.refs.compareAndSet( null, refs ) )
{
this.trackingCount = trackingCount.get();
}
else
{
//some other thread got done first. If we have more refPairs, we might need to unget some services.
Collection<RefPair<S, T>> actualRefs = this.refs.get();
refs.removeAll( actualRefs );
for (RefPair<S, T> ref: refs)
{
ungetService( ref );
}
}
return cardinalitySatisfied( serviceCount );
}
public void close()
{
Collection<RefPair<S, T>> refs = this.refs.getAndSet( null );
if ( refs != null )
{
for ( RefPair<S, T> ref: refs )
{
ungetService( ref );
}
}
deactivateTracker();
}
public Collection<RefPair<S, T>> getRefs( AtomicInteger trackingCount )
{
trackingCount.set( this.trackingCount );
Collection<RefPair<S, T>> refs = this.refs.get();
return refs == null? Collections.<RefPair<S, T>>emptyList(): refs;
}
}
private class SingleDynamicCustomizer extends AbstractCustomizer {
private RefPair<S, T> refPair;
private int trackingCount;
public RefPair<S, T> addingService( ServiceReference<T> serviceReference )
{
RefPair<S, T> refPair = getPreviousRefMap().get( serviceReference );
if ( refPair == null )
{
refPair = newRefPair(serviceReference);
}
return refPair;
}
public void addedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount, int serviceCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleDynamic added {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
boolean tracked = false;
if ( getPreviousRefMap().remove( serviceReference ) == null )
{
if (isActive() )
{
boolean invokeBind;
synchronized ( getTracker().tracked() )
{
invokeBind = this.refPair == null
|| ( !isReluctant() && refPair.getRef().compareTo( this.refPair.getRef() ) > 0 );
}
if ( invokeBind )
{
m_componentManager.invokeBindMethod( DependencyManager.this, refPair, trackingCount );
if ( !refPair.isFailed() )
{
if ( this.refPair != null )
{
m_componentManager.invokeUnbindMethod( DependencyManager.this, this.refPair,
trackingCount );
closeRefPair();
}
}
else
{
m_componentManager.registerMissingDependency( DependencyManager.this, serviceReference,
trackingCount );
}
this.refPair = refPair;
}
}
else if ( isTrackerOpened() && cardinalityJustSatisfied( serviceCount ) )
{
tracked( trackingCount );
tracked = true;
m_componentManager.activateInternal( trackingCount );
}
}
this.trackingCount = trackingCount;
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleDynamic added {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
if ( !tracked )
{
tracked(trackingCount);
}
}
public void modifiedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleDynamic modified {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
boolean invokeUpdated;
synchronized (getTracker().tracked())
{
invokeUpdated = isActive() && refPair == this.refPair;
}
if ( invokeUpdated )
{
m_componentManager.invokeUpdatedMethod( DependencyManager.this, refPair, trackingCount );
}
this.trackingCount = trackingCount;
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleDynamic modified {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
tracked( trackingCount );
}
public void removedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleDynamic removed {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
refPair.setDeleted( true );
boolean deactivate = false;
boolean untracked = true;
RefPair<S, T> oldRefPair = null;
RefPair<S, T> nextRefPair = null;
synchronized ( getTracker().tracked() )
{
if ( refPair == this.refPair && isActive() )
{
if ( !getTracker().isEmpty() )
{
AtomicInteger trackingCount2 = new AtomicInteger();
SortedMap<ServiceReference<T>, RefPair<S, T>> tracked = getTracker().getTracked( true, //TODO true here looks odd.
trackingCount2 );
nextRefPair = tracked.values().iterator().next();
}
//n.b. we cannot use cardinalitySatisfied( serviceCount ) here as the call may come from an old tracker during target change.
if ( isEffectivelyOptional() || nextRefPair != null )
{
oldRefPair = this.refPair;
this.refPair = null;
}
else
{
deactivate = true; //required and no replacement service, deactivate
}
}
else if ( !cardinalitySatisfied( getTracker().getServiceCount() ) && this.refPair == null)
{
deactivate = true;
}
}
if ( nextRefPair != null )
{
m_componentManager.invokeBindMethod( DependencyManager.this, nextRefPair,
trackingCount );
}
if ( oldRefPair != null )
{
this.trackingCount = trackingCount;
m_componentManager.invokeUnbindMethod( DependencyManager.this, oldRefPair, trackingCount );
synchronized ( getTracker().tracked() )
{
this.refPair = nextRefPair;
}
tracked( trackingCount );
untracked = false;
}
else if ( deactivate )
{
this.trackingCount = trackingCount;
tracked( trackingCount );
untracked = false;
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
}
if ( oldRefPair != null )
{
ungetService( oldRefPair );
}
if (untracked) // not ours
{
this.trackingCount = trackingCount;
tracked( trackingCount );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleDynamic removed {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
}
public boolean prebind(ComponentContextImpl<S> key)
{
RefPair<S, T> refPair = null;
boolean success = cardinalitySatisfied( 0 );
AtomicInteger trackingCount = new AtomicInteger();
synchronized ( getTracker().tracked() )
{
if ( success || !getTracker().isEmpty() )
{
SortedMap<ServiceReference<T>, RefPair<S, T>> tracked = getTracker().getTracked( true, trackingCount );
if ( !tracked.isEmpty() )
{
refPair = tracked.values().iterator().next();
this.refPair = refPair;
}
}
}
if (refPair != null)
{
success |= getServiceObject( key, m_bindMethods.getBind(), refPair );
if ( refPair.isFailed() )
{
m_componentManager.registerMissingDependency( DependencyManager.this, refPair.getRef(),
trackingCount.get() );
}
}
return success;
}
public void close()
{
closeRefPair();
deactivateTracker();
}
private void closeRefPair()
{
if ( refPair != null )
{
ungetService( refPair );
}
refPair = null;
}
public Collection<RefPair<S, T>> getRefs( AtomicInteger trackingCount )
{
Object monitor = getTracker() == null? null: getTracker().tracked();
if ( monitor != null )
{
synchronized ( monitor )
{
trackingCount.set( this.trackingCount );
return refPair == null? Collections.<RefPair<S, T>> emptyList(): Collections.singleton( refPair );
}
}
else
{
return Collections.<RefPair<S, T>> emptyList();
}
}
}
private class SingleStaticCustomizer extends AbstractCustomizer
{
private RefPair<S, T> refPair;
private int trackingCount;
public RefPair<S, T> addingService( ServiceReference<T> serviceReference )
{
RefPair<S, T> refPair = newRefPair(serviceReference);
return refPair;
}
public void addedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount, int serviceCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleStatic added {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
this.trackingCount = trackingCount;
tracked( trackingCount );
if ( isActive() )
{
boolean reactivate;
synchronized (getTracker().tracked())
{
reactivate = !isReluctant() && ( this.refPair == null || refPair.getRef().compareTo( this.refPair.getRef() ) > 0 );
}
if ( reactivate )
{
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
m_componentManager.activateInternal( trackingCount );
}
else
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleStatic active but new {2} is worse match than old {3}", new Object[] {getName(), trackingCount, refPair, this.refPair, }, null );
}
}
else if (isTrackerOpened() && cardinalityJustSatisfied( serviceCount ) )
{
m_componentManager.activateInternal( trackingCount );
}
else
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleStatic active: {2} trackerOpened: {3} optional: {4}", new Object[] {getName(), trackingCount, isActive(), isTrackerOpened(), isOptional()}, null );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleStatic added {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
}
public void modifiedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleStatic modified {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
boolean invokeUpdated;
synchronized (getTracker().tracked())
{
invokeUpdated = isActive() && refPair == this.refPair;
}
if ( invokeUpdated )
{
m_componentManager.invokeUpdatedMethod( DependencyManager.this, refPair, trackingCount );
}
this.trackingCount = trackingCount;
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleStatic modified {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
tracked( trackingCount );
}
public void removedService( ServiceReference<T> serviceReference, RefPair<S, T> refPair, int trackingCount )
{
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleStatic removed {2} (enter)", new Object[] {getName(), trackingCount, serviceReference}, null );
refPair.setDeleted( true );
this.trackingCount = trackingCount;
tracked( trackingCount );
boolean reactivate;
final Object sync = getTracker().tracked();
synchronized (sync)
{
reactivate = ( isActive() && refPair == this.refPair) || ( !cardinalitySatisfied( getTracker().getServiceCount() ));
if (!reactivate && refPair == this.refPair) {
this.refPair = null;
}
}
if ( reactivate )
{
m_componentManager.deactivateInternal( ComponentConstants.DEACTIVATION_REASON_REFERENCE, false, false );
synchronized ( sync )
{
if (refPair == this.refPair)
{
this.refPair = null;
}
}
m_componentManager.activateInternal( trackingCount );
}
m_componentManager.log( LogService.LOG_DEBUG, "dm {0} tracking {1} SingleStatic removed {2} (exit)", new Object[] {getName(), trackingCount, serviceReference}, null );
}
public boolean prebind(ComponentContextImpl<S> key)
{
boolean success = cardinalitySatisfied( 0 );
if ( success || !getTracker().isEmpty() )
{
RefPair<S, T> refPair = null;
AtomicInteger trackingCount = new AtomicInteger();
synchronized ( getTracker().tracked() )
{
SortedMap<ServiceReference<T>, RefPair<S, T>> tracked = getTracker().getTracked( true, trackingCount );
if ( !tracked.isEmpty() )
{
refPair = tracked.values().iterator().next();
this.refPair = refPair;
}
}
if ( refPair != null )
{
success |= getServiceObject( key, m_bindMethods.getBind(), refPair );
if ( refPair.isFailed() )
{
m_componentManager.registerMissingDependency( DependencyManager.this, refPair.getRef(),
trackingCount.get() );
}
}
}
return success;
}
public void close()
{
ServiceTracker<T, RefPair<S, T>> tracker = getTracker();
if ( tracker != null )
{
RefPair<S, T> ref;
synchronized ( tracker.tracked() )
{
ref = refPair;
refPair = null;
}
if ( ref != null )
{
ungetService( ref );
}
tracker.deactivate();
}
}
public Collection<RefPair<S, T>> getRefs( AtomicInteger trackingCount )
{
Object monitor = getTracker() == null? null: getTracker().tracked();
if ( monitor != null )
{
synchronized ( monitor )
{
trackingCount.set( this.trackingCount );
return refPair == null? Collections.<RefPair<S, T>> emptyList(): Collections.singleton( refPair );
}
}
else
{
return Collections.<RefPair<S, T>> emptyList();
}
}
}
private class NoPermissionsCustomizer implements Customizer<S, T>
{
public boolean prebind(ComponentContextImpl<S> key)
{
return false;
}
public void close()
{
}
public Collection<RefPair<S, T>> getRefs( AtomicInteger trackingCount )
{
return Collections.emptyList();
}
public boolean isSatisfied()
{
return isOptional();
}
public void setTracker( ServiceTracker<T, RefPair<S, T>> tRefPairServiceTracker )
{
}
public void setTrackerOpened()
{
}
public void setPreviousRefMap( Map<ServiceReference<T>, RefPair<S, T>> previousRefMap )
{
}
public RefPair<S, T> addingService( ServiceReference<T> tServiceReference )
{
return null;
}
public void addedService( ServiceReference<T> tServiceReference, RefPair<S, T> service, int trackingCount, int serviceCount )
{
}
public void modifiedService( ServiceReference<T> tServiceReference, RefPair<S, T> service, int trackingCount )
{
}
public void removedService( ServiceReference<T> tServiceReference, RefPair<S, T> service, int trackingCount )
{
}
}
private String getServiceName()
{
return m_dependencyMetadata.getInterface();
}
boolean isOptional()
{
return m_dependencyMetadata.isOptional();
}
private boolean isEffectivelyOptional()
{
return m_minCardinality == 0;
}
private boolean cardinalitySatisfied(int serviceCount)
{
return m_minCardinality <= serviceCount;
}
private boolean cardinalityJustSatisfied(int serviceCount)
{
return m_minCardinality == serviceCount;
}
private boolean isMultiple()
{
return m_dependencyMetadata.isMultiple();
}
private boolean isStatic()
{
return m_dependencyMetadata.isStatic();
}
private boolean isReluctant()
{
return m_dependencyMetadata.isReluctant();
}
//---------- Service tracking support -------------------------------------
void deactivate()
{
m_customizer.close();
}
/**
* Returns the number of services currently registered in the system,
* which match the service criteria (interface and optional target filter)
* configured for this dependency. The number returned by this method has
* no correlation to the number of services bound to this dependency
* manager. It is actually the maximum number of services which may be
* bound to this dependency manager.
*
* @see #isSatisfied()
*/
int size()
{
AtomicInteger trackingCount = new AtomicInteger( );
return m_tracker.getTracked( null, trackingCount ).size();
}
private ServiceReference<T>[] getFrameworkServiceReferences( String targetFilter )
{
if ( hasGetPermission() )
{
// component activator may be null if disposed concurrently
BundleComponentActivator bca = m_componentManager.getActivator();
if ( bca == null )
{
return null;
}
// get bundle context, may be null if component deactivated since getting bca
BundleContext bc = bca.getBundleContext();
if ( bc == null )
{
return null;
}
try
{
return ( ServiceReference<T>[] ) bc.getServiceReferences(
m_dependencyMetadata.getInterface(), targetFilter );
}
catch ( IllegalStateException ise )
{
// bundle context is not valid any longer, cannot log
}
catch ( InvalidSyntaxException ise )
{
m_componentManager.log( LogService.LOG_ERROR, "Unexpected problem with filter ''{0}''", new Object[]
{ targetFilter }, ise );
return null;
}
}
m_componentManager.log( LogService.LOG_DEBUG, "No permission to access the services", null );
return null;
}
/**
* Returns a <code>ServiceReference</code> instances for a service
* implementing the interface and complying to the (optional) target filter
* declared for this dependency. If no matching service can be found
* <code>null</code> is returned. If the configured target filter is
* syntactically incorrect an error message is logged with the LogService
* and <code>null</code> is returned. If multiple matching services are
* registered the service with the highest service.ranking value is
* returned. If multiple matching services have the same service.ranking
* value, the service with the lowest service.id is returned.
* <p>
*/
private RefPair<S, T> getBestRefPair()
{
Collection<RefPair<S, T>> refs = m_customizer.getRefs( new AtomicInteger( ) );
if (refs.isEmpty())
{
return null;
}
return refs.iterator().next();
}
/**
* Returns the service instance for the service reference returned by the
* {@link #getBestRefPair()} method. If this returns a
* non-<code>null</code> service instance the service is then considered
* bound to this instance.
* @param key TODO
*/
T getService(ComponentContextImpl<S> key)
{
RefPair<S, T> sr = getBestRefPair();
return getService( key, sr );
}
/**
* Returns an array of service instances for the service references returned
* by the customizer. If no services
* match the criteria configured for this dependency <code>null</code> is
* returned. All services returned by this method will be considered bound
* after this method returns.
* @param key TODO
*/
T[] getServices(ComponentContextImpl<S> key)
{
Collection<RefPair<S, T>> refs = m_customizer.getRefs( new AtomicInteger( ) );
List<T> services = new ArrayList<T>( refs.size() );
for ( RefPair<S, T> ref: refs)
{
T service = getService(key, ref);
if (service != null)
{
services.add( service );
}
}
return services.isEmpty()? null: (T[])services.toArray( new Object[ services.size()] );
}
//---------- bound services maintenance -----------------------------------
/* (non-Javadoc)
* @see org.apache.felix.scr.impl.manager.ReferenceManager#getServiceReferences()
*/
public List<ServiceReference<?>> getServiceReferences()
{
Collection<RefPair<S, T>> bound = m_customizer.getRefs( new AtomicInteger( ) );
List<ServiceReference<?>> result = new ArrayList<ServiceReference<?>>(bound.size());
for (RefPair<S, T> ref: bound)
{
result.add(ref.getRef());
}
return result;
}
/**
* Returns the RefPair containing the given service reference and the bound service
* or <code>null</code> if this is instance is not currently bound to that
* service.
*
* @param serviceReference The reference to the bound service
*
* @return RefPair the reference and service for the reference
* if the service is bound or <code>null</code> if the service is not
* bound.
*/
private RefPair<S, T> getRefPair( ServiceReference<T> serviceReference )
{
final ServiceTracker<T, RefPair<S, T>> tracker = m_tracker;
if ( tracker != null )
{
AtomicInteger trackingCount = new AtomicInteger( );
return tracker.getTracked( null, trackingCount ).get( serviceReference );
}
return null;
}
/**
* Returns the service described by the ServiceReference. If this instance
* is already bound the given service, that bound service instance is
* returned. Otherwise the service retrieved from the service registry
* and kept as a bound service for future use.
* @param key TODO
* @param serviceReference The reference to the service to be returned
*
* @return The requested service or <code>null</code> if no service is
* registered for the service reference (any more).
*/
T getService( ComponentContextImpl<S> key, ServiceReference<T> serviceReference )
{
// check whether we already have the service and return that one
RefPair<S, T> refPair = getRefPair( serviceReference );
return getService( key, refPair );
}
private T getService( ComponentContextImpl<S> key, RefPair<S, T> refPair )
{
if (refPair == null)
{
//we don't know about this reference
return null;
}
T serviceObject;
if ( (serviceObject = refPair.getServiceObject(key)) != null )
{
return serviceObject;
}
// otherwise acquire the service
final BundleContext bundleContext = m_componentManager.getBundleContext();
if (bundleContext == null)
{
m_componentManager.log( LogService.LOG_ERROR, "Bundle shut down while getting service {0} ({1}/{2,number,#})", new Object[]
{ getName(), m_dependencyMetadata.getInterface(),
refPair.getRef().getProperty( Constants.SERVICE_ID ) }, null );
return null;
}
try
{
refPair.getServiceObject(key, bundleContext, m_componentManager);
serviceObject = refPair.getServiceObject( key );
}
catch ( Exception e )
{
// caused by getService() called on invalid bundle context
// or if there is a service reference cycle involving service
// factories !
m_componentManager.log( LogService.LOG_ERROR, "Failed getting service {0} ({1}/{2,number,#})", new Object[]
{ getName(), m_dependencyMetadata.getInterface(),
refPair.getRef().getProperty( Constants.SERVICE_ID ) }, e );
return null;
}
// return the acquired service (may be null of course)
//even if we did not set the service object, all the getService are for the same bundle so will have the same object.
return serviceObject;
}
//---------- DependencyManager core ---------------------------------------
/* (non-Javadoc)
* @see org.apache.felix.scr.impl.manager.ReferenceManager#getName()
*/
public String getName()
{
return m_dependencyMetadata.getName();
}
/**
* Returns <code>true</code> if this dependency manager is satisfied, that
* is if either the dependency is optional or the number of services
* registered in the framework and available to this dependency manager is
* not zero.
*/
public boolean isSatisfied()
{
return m_customizer.isSatisfied();
}
/**
* Returns <code>true</code> if the component providing bundle has permission
* to get the service described by this reference.
*/
public boolean hasGetPermission()
{
if ( System.getSecurityManager() != null )
{
Permission perm = new ServicePermission( getServiceName(), ServicePermission.GET );
return m_componentManager.getBundle().hasPermission( perm );
}
// no security manager, hence permission given
return true;
}
boolean prebind(ComponentContextImpl<S> key)
{
return m_customizer.prebind(key);
}
/**
* initializes a dependency. This method binds all of the service
* occurrences to the instance object
* @param edgeInfo Edge info for the combination of this component instance and this dependency manager.
*
* @return true if the dependency is satisfied and at least the minimum
* number of services could be bound. Otherwise false is returned.
*/
boolean open( ComponentContextImpl<S> componentContext, EdgeInfo edgeInfo )
{
int serviceCount = 0;
AtomicInteger trackingCount = new AtomicInteger( );
Collection<RefPair<S, T>> refs;
CountDownLatch openLatch;
synchronized ( m_tracker.tracked() )
{
refs = m_customizer.getRefs( trackingCount );
edgeInfo.setOpen( trackingCount.get() );
openLatch = edgeInfo.getOpenLatch( );
}
m_componentManager.log( LogService.LOG_DEBUG,
"For dependency {0}, optional: {1}; to bind: {2}",
new Object[]{ getName(), isOptional(), refs }, null );
for ( RefPair<S, T> refPair : refs )
{
if ( !refPair.isDeleted() && !refPair.isFailed() )
{
if ( !doInvokeBindMethod( componentContext, refPair ) )
{
m_componentManager.log( LogService.LOG_DEBUG,
"For dependency {0}, failed to invoke bind method on object {1}",
new Object[] {getName(), refPair}, null );
}
serviceCount++;
}
}
openLatch.countDown();
return cardinalitySatisfied(serviceCount);
}
/**
* Revoke the given bindings. This method cannot throw an exception since
* it must try to complete all that it can
* @param componentContext instance we are unbinding from.
* @param edgeInfo EdgeInfo for the combination of this component instance and this dependency manager.
*/
void close( ComponentContextImpl<S> componentContext, EdgeInfo edgeInfo )
{
// only invoke the unbind method if there is an instance (might be null
// in the delayed component situation) and the unbind method is declared.
boolean doUnbind = componentContext != null && m_dependencyMetadata.getUnbind() != null;
AtomicInteger trackingCount = new AtomicInteger();
Collection<RefPair<S, T>> refPairs;
CountDownLatch latch;
synchronized ( m_tracker.tracked() )
{
refPairs = m_customizer.getRefs( trackingCount );
edgeInfo.setClose( trackingCount.get() );
latch = edgeInfo.getCloseLatch( );
}
m_componentManager.log( LogService.LOG_DEBUG,
"DependencyManager: {0} close component unbinding from {1} at tracking count {2} refpairs: {3}",
new Object[] {getName(), componentContext, trackingCount.get(), refPairs}, null );
m_componentManager.waitForTracked( trackingCount.get() );
for ( RefPair<S, T> boundRef : refPairs )
{
if ( doUnbind && !boundRef.isFailed() )
{
invokeUnbindMethod( componentContext, boundRef, trackingCount.get(), edgeInfo );
}
}
latch.countDown();
}
public void invokeBindMethodLate( final ServiceReference<T> ref, int trackingCount )
{
if ( !isSatisfied() )
{
return;
}
if ( !isMultiple() )
{
Collection<RefPair<S, T>> refs = m_customizer.getRefs( new AtomicInteger( ) );
if (refs.isEmpty())
{
return;
}
RefPair<S, T> test = refs.iterator().next();
if ( ref != test.getRef())
{
//another ref is now better
return;
}
}
//TODO dynamic reluctant
RefPair<S, T> refPair = m_tracker.getService( ref );
//TODO this check is no longer correct, fix it!
// if (refPair.getServiceObject(key) != null)
// {
// m_componentManager.log( LogService.LOG_DEBUG,
// "DependencyManager : late binding of service reference {1} skipped as service has already been located",
// new Object[] {ref}, null );
// //something else got the reference and may be binding it.
// return;
// }
m_componentManager.invokeBindMethod( this, refPair, trackingCount );
}
/**
* Calls the bind method. In case there is an exception while calling the
* bind method, the service is not considered to be bound to the instance
* object
* <p>
* If the reference is singular and a service has already been bound to the
* component this method has no effect and just returns <code>true</code>.
*
*
*
* @param componentContext instance we are binding to
* @param refPair the service reference, service object tuple.
* @param trackingCount service event counter for this service.
* @param edgeInfo EdgeInfo for the combination of this instance and this dependency manager.
* @return true if the service should be considered bound. If no bind
* method is found or the method call fails, <code>true</code> is
* returned. <code>false</code> is only returned if the service must
* be handed over to the bind method but the service cannot be
* retrieved using the service reference.
*/
boolean invokeBindMethod( ComponentContextImpl<S> componentContext, RefPair<S, T> refPair, int trackingCount, EdgeInfo info )
{
// The bind method is only invoked if the implementation object is not
// null. This is valid for both immediate and delayed components
if ( componentContext.getImplementationObject( false ) != null )
{
synchronized ( m_tracker.tracked() )
{
if (info.outOfRange( trackingCount ) )
{
//ignore events before open started or we will have duplicate binds.
return true;
}
}
//edgeInfo open has been set, so binding has started.
return doInvokeBindMethod( componentContext, refPair );
}
else
{
m_componentManager.log( LogService.LOG_DEBUG,
"DependencyManager : component not yet created, assuming bind method call succeeded",
null );
return true;
}
}
private boolean doInvokeBindMethod(ComponentContextImpl<S> componentContext, RefPair<S, T> refPair)
{
if ( !getServiceObject( componentContext, m_bindMethods.getBind(), refPair ))
{
m_componentManager.log( LogService.LOG_WARNING,
"DependencyManager : invokeBindMethod : Service not available from service registry for ServiceReference {0} for reference {1}",
new Object[] {refPair.getRef(), getName()}, null );
return false;
}
BindParameters bp = new BindParameters(componentContext, refPair);
MethodResult result = m_bindMethods.getBind().invoke( componentContext.getImplementationObject( false ), bp, MethodResult.VOID, m_componentManager );
if ( result == null )
{
return false;
}
m_componentManager.setServiceProperties( result );
return true;
}
/**
* Calls the updated method.
*
* @param componentContext instance we are calling updated on.
* @param refPair A service reference corresponding to the service whose service
* @param edgeInfo EdgeInfo for the comibination of this instance and this dependency manager.
*/
void invokeUpdatedMethod( ComponentContextImpl<S> componentContext, final RefPair<S, T> refPair, int trackingCount, EdgeInfo info )
{
if ( m_dependencyMetadata.getUpdated() == null )
{
return;
}
// The updated method is only invoked if the implementation object is not
// null. This is valid for both immediate and delayed components
if ( componentContext != null )
{
synchronized ( m_tracker.tracked() )
{
if (info.outOfRange( trackingCount ) )
{
//ignore events after close started or we will have duplicate unbinds.
return;
}
}
info.waitForOpen( m_componentManager, getName(), "invokeUpdatedMethod" );
if ( !getServiceObject( componentContext, m_bindMethods.getUpdated(), refPair ))
{
m_componentManager.log( LogService.LOG_WARNING,
"DependencyManager : invokeUpdatedMethod : Service not available from service registry for ServiceReference {0} for reference {1}",
new Object[] {refPair.getRef(), getName()}, null );
return;
}
BindParameters bp = new BindParameters(componentContext, refPair);
MethodResult methodResult = m_bindMethods.getUpdated().invoke( componentContext.getImplementationObject( false ), bp, MethodResult.VOID, m_componentManager );
if ( methodResult != null)
{
m_componentManager.setServiceProperties( methodResult );
}
}
else
{
// don't care whether we can or cannot call the updated method
// if the component instance has already been cleared by the
// close() method
m_componentManager.log( LogService.LOG_DEBUG,
"DependencyManager : Component not set, no need to call updated method", null );
}
}
/**
* Calls the unbind method.
* <p>
* If the reference is singular and the given service is not the one bound
* to the component this method has no effect and just returns
* <code>true</code>.
*
* @param componentContext instance we are unbinding from
* @param refPair A service reference, service pair that will be unbound
* @param trackingCount service event count for this reference
* @param info EdgeInfo for the combination of this instance and this dependency manager
*/
void invokeUnbindMethod( ComponentContextImpl<S> componentContext, final RefPair<S, T> refPair, int trackingCount, EdgeInfo info )
{
// The unbind method is only invoked if the implementation object is not
// null. This is valid for both immediate and delayed components
if ( componentContext != null )
{
synchronized ( m_tracker.tracked() )
{
if (info.beforeRange( trackingCount ))
{
//never bound
return;
}
}
info.waitForOpen( m_componentManager, getName(), "invokeUnbindMethod" );
boolean outOfRange;
synchronized ( m_tracker.tracked() )
{
outOfRange = info.afterRange( trackingCount );
}
if ( outOfRange )
{
//wait for unbinds to complete
info.waitForClose( m_componentManager, getName(), "invokeUnbindMethod" );
//ignore events after close started or we will have duplicate unbinds.
return;
}
if ( !getServiceObject( componentContext, m_bindMethods.getUnbind(), refPair ))
{
m_componentManager.log( LogService.LOG_WARNING,
"DependencyManager : invokeUnbindMethod : Service not available from service registry for ServiceReference {0} for reference {1}",
new Object[] {refPair.getRef(), getName()}, null );
return;
}
BindParameters bp = new BindParameters(componentContext, refPair);
MethodResult methodResult = m_bindMethods.getUnbind().invoke( componentContext.getImplementationObject( false ), bp, MethodResult.VOID, m_componentManager );
if ( methodResult != null )
{
m_componentManager.setServiceProperties( methodResult );
}
}
else
{
// don't care whether we can or cannot call the unbind method
// if the component instance has already been cleared by the
// close() method
m_componentManager.log( LogService.LOG_DEBUG,
"DependencyManager : Component not set, no need to call unbind method", null );
}
}
//------------- Service target filter support -----------------------------
/**
* Returns <code>true</code> if the <code>properties</code> can be
* dynamically applied to the component to which the dependency manager
* belongs.
* <p>
* This method applies the following heuristics (in the given order):
* <ol>
* <li>If there is no change in the target filter for this dependency, the
* properties can be applied</li>
* <li>If the dependency is static and there are changes in the target
* filter we cannot dynamically apply the configuration because the filter
* may (assume they do for simplicity here) cause the bindings to change.</li>
* <li>If there is still at least one service matching the new target filter
* we can apply the configuration because the depdency is dynamic.</li>
* <li>If there are no more services matching the filter, we can still
* apply the configuration if the dependency is optional.</li>
* <li>Ultimately, if all other checks do not apply we cannot dynamically
* apply.</li>
* </ol>
*/
boolean canUpdateDynamically( Map<String, Object> properties )
{
// 1. no target filter change
final String newTarget = ( String ) properties.get( m_dependencyMetadata.getTargetPropertyName() );
final String currentTarget = getTarget();
int newMinimumCardinality = getMinimumCardinality( properties );
if ( m_minCardinality == newMinimumCardinality &&
( ( currentTarget == null && newTarget == null )
|| ( currentTarget != null && currentTarget.equals( newTarget ) ) ) )
{
// can update if target filter is not changed, since there is
// no change is service binding
return true;
}
// invariant: target filter change
// 2. if static policy, cannot update dynamically
// (for simplicity assuming change in target service binding)
if ( m_dependencyMetadata.isStatic() )
{
// cannot update if services are statically bound and the target
// filter is modified, since there is (potentially at least)
// a change is service bindings
return false;
}
// invariant: target filter change + dynamic policy
// 3. check optionality
if ( newMinimumCardinality == 0 )
{
// can update since even if no service matches the new filter, this
// makes no difference because the dependency is optional
return true;
}
// invariant: target filter change + mandatory + dynamic policy
// 4. check target services matching the new filter
ServiceReference<T>[] refs = getFrameworkServiceReferences( newTarget );
if ( refs != null )
{
// Return whether there are enough target services
return newMinimumCardinality <= refs.length;
}
// invariant: target filter change + dynamic policy + no more matching service + required
// 5. There are no services, and some are required.
return false;
}
/**
* Sets the target filter from target filter property contained in the
* properties. The filter is taken from a property whose name is derived
* from the dependency name and the suffix <code>.target</code> as defined
* for target properties on page 302 of the Declarative Services
* Specification, section 112.6.
*
* @param properties The properties containing the optional target service
* filter property
*/
void setTargetFilter( Map<String, Object> properties )
{
Integer minimumCardinality = getMinimumCardinality( properties );
setTargetFilter( ( String ) properties.get( m_dependencyMetadata.getTargetPropertyName() ),
minimumCardinality);
}
private int getMinimumCardinality(Map<String, Object> properties)
{
Integer minimumCardinality = null;
try
{
minimumCardinality = Coercions.coerceToInteger( properties.get( m_dependencyMetadata.getMinCardinalityName()));
}
catch (ComponentException e)
{
m_componentManager.log( LogService.LOG_WARNING, "Invalid minimum cardinality property for dependency {0}: {1}", new Object[]
{getName(), e.getMessage()}, null );
}
if (minimumCardinality != null &&
(minimumCardinality < defaultMinimumCardinality( m_dependencyMetadata ) ||
(!m_dependencyMetadata.isMultiple() && minimumCardinality > 1 )))
{
minimumCardinality = null;
}
if ( minimumCardinality == null)
{
minimumCardinality = defaultMinimumCardinality( m_dependencyMetadata );
}
return minimumCardinality;
}
/**
* Sets the target filter of this dependency to the new filter value. If the
* new target filter is the same as the old target filter, this method has
* not effect. Otherwise any services currently bound but not matching the
* new filter are unbound. Likewise any registered services not currently
* bound but matching the new filter are bound.
*
* @param target The new target filter to be set. This may be
* <code>null</code> if no target filtering is to be used.
*/
private void setTargetFilter( String target, int minimumCardinality )
{
// if configuration does not set filter, use the value from metadata
if (target == null)
{
target = m_dependencyMetadata.getTarget();
}
// do nothing if target filter does not change
if ( ( m_target == null && target == null ) || ( m_target != null && m_target.equals( target ) ) )
{
m_componentManager.log( LogService.LOG_DEBUG, "No change in target property for dependency {0}: currently registered: {1}", new Object[]
{getName(), m_tracker != null}, null );
if (m_tracker != null)
{
m_minCardinality = minimumCardinality;
return;
}
}
m_target = target;
String filterString = "(" + Constants.OBJECTCLASS + "=" + m_dependencyMetadata.getInterface() + ")";
if (m_target != null)
{
filterString = "(&" + filterString + m_target + ")";
}
final ServiceTracker<T, RefPair<S, T>> oldTracker = m_tracker;
AtomicInteger trackingCount = new AtomicInteger();
SortedMap<ServiceReference<T>, RefPair<S, T>> refMap = unregisterServiceListener( trackingCount );
if ( trackingCount.get() != -1 )
{
//wait for service events to complete before processing initial set from new tracker.
m_componentManager.waitForTracked( trackingCount.get() );
}
m_componentManager.log( LogService.LOG_DEBUG, "Setting target property for dependency {0} to {1}", new Object[]
{getName(), target}, null );
BundleContext bundleContext = m_componentManager.getBundleContext();
if ( bundleContext != null )
{
try
{
m_targetFilter = bundleContext.createFilter( filterString );
}
catch ( InvalidSyntaxException ise )
{
m_componentManager.log( LogService.LOG_ERROR, "Invalid syntax in target property for dependency {0} to {1}", new Object[]
{getName(), target}, null );
//create a filter that will never be satisfied
filterString = "(component.id=-1)";
try
{
m_targetFilter = bundleContext.createFilter( filterString );
}
catch ( InvalidSyntaxException e )
{
//this should not happen
return;
}
}
}
else
{
m_componentManager.log( LogService.LOG_ERROR, "Bundle is shut down for dependency {0} to {1}", new Object[]
{getName(), target}, null );
return;
}
m_customizer.setPreviousRefMap( refMap );
boolean initialActive = oldTracker != null && oldTracker.isActive();
m_componentManager.log( LogService.LOG_DEBUG, "New service tracker for {0}, initial active: {1}, previous references: {2}", new Object[]
{getName(), initialActive, refMap}, null );
ServiceTracker<T, RefPair<S, T>> tracker = new ServiceTracker<T, RefPair<S, T>>( bundleContext, m_targetFilter, m_customizer, initialActive );
m_customizer.setTracker( tracker );
//set minimum cardinality
m_minCardinality = minimumCardinality;
tracker.open( m_componentManager.getTrackingCount() );
m_customizer.setTrackerOpened();
if ( oldTracker != null )
{
oldTracker.completeClose( refMap );
}
m_componentManager.log( LogService.LOG_DEBUG, "registering service listener for dependency {0}", new Object[]
{getName()}, null );
}
private Customizer<S, T> newCustomizer()
{
Customizer<S, T> customizer;
if (!hasGetPermission())
{
customizer = new NoPermissionsCustomizer();
m_componentManager.log( LogService.LOG_INFO, "No permission to get services for {0}", new Object[]
{getName()}, null );
}
else if (m_componentManager.isFactory())
{
customizer = new FactoryCustomizer();
}
else if ( isMultiple() )
{
if ( isStatic() )
{
if ( isReluctant() )
{
customizer = new MultipleStaticReluctantCustomizer();
}
else
{
customizer = new MultipleStaticGreedyCustomizer();
}
}
else
{
customizer = new MultipleDynamicCustomizer();
}
}
else
{
if ( isStatic() )
{
customizer = new SingleStaticCustomizer();
}
else
{
customizer = new SingleDynamicCustomizer();
}
}
return customizer;
}
SortedMap<ServiceReference<T>, RefPair<S, T>> unregisterServiceListener( AtomicInteger trackingCount )
{
SortedMap<ServiceReference<T>, RefPair<S, T>> refMap;
ServiceTracker<T, RefPair<S, T>> tracker = m_tracker;
if ( tracker != null )
{
refMap = tracker.close( trackingCount );
m_tracker = null;
m_componentManager.log( LogService.LOG_DEBUG, "unregistering service listener for dependency {0}", new Object[]
{getName()}, null );
}
else
{
refMap = new TreeMap<ServiceReference<T>, RefPair<S, T>>(Collections.reverseOrder());
m_componentManager.log( LogService.LOG_DEBUG, " No existing service listener to unregister for dependency {0}", new Object[]
{getName()}, null );
trackingCount.set( -1 );
}
// m_registered = false;
return refMap;
}
/* (non-Javadoc)
* @see org.apache.felix.scr.impl.manager.ReferenceManager#getTarget()
*/
public String getTarget()
{
return m_target;
}
public String toString()
{
return "DependencyManager: Component [" + m_componentManager + "] reference [" + getName() + "]";
}
boolean getServiceObject(ComponentContextImpl<S> key, BindMethod bindMethod, RefPair<S, T> refPair)
{
BundleContext bundleContext = m_componentManager.getBundleContext();
if ( bundleContext != null )
{
return bindMethod.getServiceObject( key, refPair, bundleContext, m_componentManager );
}
else
{
refPair.setFailed();
return false;
}
}
RefPair<S, T> newRefPair(ServiceReference<T> serviceReference)
{
if ( m_dependencyMetadata.getScope() == ReferenceScope.bundle )
{
return new SingleRefPair<S, T>( serviceReference );
}
if ( m_componentManager.getComponentMetadata().getServiceScope() == Scope.singleton )
{
return new SinglePrototypeRefPair<S, T>(m_componentManager.getBundleContext(), serviceReference);
}
return new MultiplePrototypeRefPair<S, T>(m_componentManager.getBundleContext(), serviceReference);
}
}