/*
* Sonatype Nexus (TM) Open Source Version
* Copyright (c) 2007-2014 Sonatype, Inc.
* All rights reserved. Includes the third-party code listed at http://links.sonatype.com/products/nexus/oss/attributions.
*
* This program and the accompanying materials are made available under the terms of the Eclipse Public License Version 1.0,
* which accompanies this distribution and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Sonatype Nexus (TM) Professional Version is available from Sonatype, Inc. "Sonatype" and "Sonatype Nexus" are trademarks
* of Sonatype, Inc. Apache Maven is a trademark of the Apache Software Foundation. M2eclipse is a trademark of the
* Eclipse Foundation. All other trademarks are the property of their respective owners.
*/
package org.sonatype.nexus.capability.internal;
import javax.inject.Inject;
import org.sonatype.nexus.capability.CapabilityContextAware;
import org.sonatype.nexus.capability.Condition;
import org.sonatype.nexus.capability.ConditionEvent;
import org.sonatype.nexus.capability.condition.SatisfiedCondition;
import org.sonatype.nexus.capability.condition.UnsatisfiedCondition;
import org.sonatype.nexus.capability.support.condition.Conditions;
import org.sonatype.sisu.goodies.common.ComponentSupport;
import org.sonatype.sisu.goodies.eventbus.EventBus;
import com.google.common.eventbus.AllowConcurrentEvents;
import com.google.common.eventbus.Subscribe;
import com.google.inject.assistedinject.Assisted;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Handles capability activation by reacting capability activation condition being satisfied/unsatisfied.
*
* @since capabilities 2.0
*/
public class ActivationConditionHandler
extends ComponentSupport
{
private final EventBus eventBus;
private final DefaultCapabilityReference reference;
private final Conditions conditions;
private Condition activationCondition;
@Inject
ActivationConditionHandler(final EventBus eventBus,
final Conditions conditions,
final @Assisted DefaultCapabilityReference reference)
{
this.eventBus = checkNotNull(eventBus);
this.conditions = checkNotNull(conditions);
this.reference = checkNotNull(reference);
}
boolean isConditionSatisfied() {
return activationCondition != null && activationCondition.isSatisfied();
}
@AllowConcurrentEvents
@Subscribe
public void handle(final ConditionEvent.Satisfied event) {
if (event.getCondition() == activationCondition) {
reference.activate();
}
}
@AllowConcurrentEvents
@Subscribe
public void handle(final ConditionEvent.Unsatisfied event) {
if (event.getCondition() == activationCondition) {
reference.passivate();
}
}
ActivationConditionHandler bind() {
if (activationCondition == null) {
try {
Condition capabilityActivationCondition = reference.capability().activationCondition();
if (capabilityActivationCondition == null) {
capabilityActivationCondition = new SatisfiedCondition("Capability has no activation condition");
}
activationCondition = conditions.logical().and(
capabilityActivationCondition,
conditions.nexus().active(),
conditions.capabilities().capabilityHasNoFailures()
);
if (activationCondition instanceof CapabilityContextAware) {
((CapabilityContextAware) activationCondition).setContext(reference.context());
}
}
catch (Exception e) {
activationCondition = new UnsatisfiedCondition("Failed to determine activation condition");
log.error(
"Could not get activation condition from capability {} ({}). Considering it as non activatable",
reference.capability(), reference.context().id(), e
);
}
activationCondition.bind();
eventBus.register(this);
}
return this;
}
ActivationConditionHandler release() {
if (activationCondition != null) {
eventBus.unregister(this);
activationCondition.release();
activationCondition = null;
}
return this;
}
@Override
public String toString() {
return String.format(
"Watching '%s' condition to activate/passivate capability '%s (id=%s)'",
activationCondition, reference.capability(), reference.context().id()
);
}
public String explainWhyNotSatisfied() {
return isConditionSatisfied() ? null : activationCondition.explainUnsatisfied();
}
}