/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.dependency.plugins;
import org.jboss.dependency.spi.Controller;
import org.jboss.dependency.spi.ControllerContext;
import org.jboss.dependency.spi.ControllerMode;
import org.jboss.dependency.spi.ControllerState;
import org.jboss.dependency.spi.DependencyInfo;
import org.jboss.dependency.spi.DependencyItem;
import org.jboss.logging.Logger;
import org.jboss.util.JBossObject;
import org.jboss.util.JBossStringBuilder;
/**
* A DependencyItem.
*
* @author <a href="adrian@jboss.com">Adrian Brock</a>
* @version $Revision: 57321 $
*/
public class AbstractDependencyItem extends JBossObject implements DependencyItem
{
/** The log */
private static final Logger log = Logger.getLogger(AbstractDependencyItem.class);
/** What I depend on */
private Object iDependOn;
/** My name */
private Object name;
/** When the dependency is required */
private ControllerState whenRequired = ControllerState.DESCRIBED;
/** The state of the dependency */
private ControllerState dependentState;
/** Whether we are resolved */
private boolean resolved;
/**
* Create a new dependency item
*/
public AbstractDependencyItem()
{
}
/**
* Create a new dependency item
*
* @param name my name
* @param iDependOn what I depend on
* @param whenRequired when the dependency is required
* @param dependentState the required state of the dependent
*/
public AbstractDependencyItem(Object name, Object iDependOn, ControllerState whenRequired, ControllerState dependentState)
{
this.name = name;
this.iDependOn = iDependOn;
this.whenRequired = whenRequired;
this.dependentState = dependentState;
}
public Object getName()
{
return name;
}
public Object getIDependOn()
{
return iDependOn;
}
public ControllerState getWhenRequired()
{
return whenRequired;
}
public ControllerState getDependentState()
{
return dependentState;
}
public boolean isResolved()
{
return resolved;
}
public boolean resolve(Controller controller)
{
boolean previous = resolved;
ControllerContext context;
if (dependentState == null)
context = controller.getInstalledContext(iDependOn);
else
{
context = controller.getContext(iDependOn, dependentState);
if (context == null)
{
if (dependentState == ControllerState.INSTALLED)
context = controller.getInstalledContext(iDependOn);
}
}
if (context == null)
{
resolved = false;
ControllerContext unresolvedContext = controller.getContext(iDependOn, null);
if (unresolvedContext != null && ControllerMode.ON_DEMAND.equals(unresolvedContext.getMode()))
{
try
{
controller.enableOnDemand(unresolvedContext);
}
catch (Throwable ignored)
{
if (log.isTraceEnabled())
log.trace("Unexpected error", ignored);
}
}
}
else
{
addDependsOnMe(controller, context);
resolved = true;
}
if (previous != resolved)
{
flushJBossObjectCache();
if (log.isTraceEnabled())
{
if (resolved)
log.trace("Resolved " + this);
else
log.trace("Unresolved " + this);
}
}
return resolved;
}
public void unresolved(Controller controller)
{
if (resolved)
{
resolved = false;
flushJBossObjectCache();
log.trace("Forced unresolved " + this);
}
}
public void toString(JBossStringBuilder buffer)
{
buffer.append("name=").append(name);
buffer.append(" dependsOn=").append(iDependOn);
if (whenRequired != null)
buffer.append(" whenRequired=").append(whenRequired.getStateString());
if (dependentState != null)
buffer.append(" dependentState=").append(dependentState.getStateString());
buffer.append(" resolved=").append(resolved);
}
public void toShortString(JBossStringBuilder buffer)
{
buffer.append(name).append(" dependsOn ").append(iDependOn);
}
/**
* Register a dependency with another context
*
* @param controller the controller
* @param context the other context
*/
protected void addDependsOnMe(Controller controller, ControllerContext context)
{
DependencyInfo info = context.getDependencyInfo();
if (info != null)
info.addDependsOnMe(this);
}
/**
* Set what I depend upon
*
* @param iDependOn what I depend upon
*/
protected void setIDependOn(Object iDependOn)
{
this.iDependOn = iDependOn;
flushJBossObjectCache();
}
/**
* Set the resolved state
*
* @param resolved the new resolved state
*/
protected void setResolved(boolean resolved)
{
this.resolved = resolved;
flushJBossObjectCache();
}
}