/
ActivationManagerImpl.java
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/
ActivationManagerImpl.java
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/*
* JBoss, Home of Professional Open Source
* Copyright 2012 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* 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.infinispan.eviction;
import org.infinispan.config.ConfigurationException;
import org.infinispan.configuration.cache.Configuration;
import org.infinispan.factories.annotations.Inject;
import org.infinispan.factories.annotations.Start;
import org.infinispan.jmx.annotations.MBean;
import org.infinispan.jmx.annotations.ManagedAttribute;
import org.infinispan.jmx.annotations.ManagedOperation;
import org.infinispan.jmx.annotations.MeasurementType;
import org.infinispan.loaders.CacheLoaderException;
import org.infinispan.loaders.CacheLoaderManager;
import org.infinispan.loaders.CacheStore;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
import java.util.concurrent.atomic.AtomicLong;
/**
* Concrete implementation of activation logic manager.
*
* @author Galder Zamarreño
* @since 5.2
*/
@MBean(objectName = "Activation",
description = "Component that handles activating entries that have been passivated to a CacheStore by loading them into memory.")
public class ActivationManagerImpl implements ActivationManager {
private static final Log log = LogFactory.getLog(ActivationManagerImpl.class);
private static final boolean trace = log.isTraceEnabled();
private final AtomicLong activations = new AtomicLong(0);
private CacheLoaderManager clm;
private CacheStore store;
private Configuration cfg;
private boolean enabled;
@ManagedAttribute(description = "Enables or disables the gathering of statistics by this component", displayName = "Statistics enabled", writable = true)
private boolean statisticsEnabled = false;
@Inject
public void inject(CacheLoaderManager clm, Configuration cfg) {
this.clm = clm;
this.cfg = cfg;
}
@Start(priority = 10) // Just before the passivation manager
public void start() {
enabled = clm.isUsingPassivation() && !clm.isShared();
if (enabled) {
store = clm.getCacheStore();
if (store == null)
throw new ConfigurationException(
"Passivation can only be used with a CacheLoader that implements CacheStore!");
statisticsEnabled = cfg.jmxStatistics().enabled();
}
}
@Override
public void activate(Object key) {
if (enabled) {
try {
if (trace)
log.tracef("Try to activate key=%s removing it from the store", key);
if (store.remove(key) && statisticsEnabled) {
activations.incrementAndGet();
}
} catch (CacheLoaderException e) {
log.unableToRemoveEntryAfterActivation(key, e);
}
} else {
if (trace)
log.trace("Don't remove entry from shared cache store after activation.");
}
}
@Override
public long getActivationCount() {
return activations.get();
}
@ManagedAttribute(
description = "Number of activation events",
displayName = "Number of cache entries activated",
measurementType = MeasurementType.TRENDSUP
)
public String getActivations() {
if (!statisticsEnabled)
return "N/A";
return String.valueOf(getActivationCount());
}
@ManagedOperation(
description = "Resets statistics gathered by this component",
displayName = "Reset statistics"
)
public void resetStatistics() {
activations.set(0);
}
}