/*
* JBoss, Home of Professional Open Source
* Copyright 2009 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.interceptors;
import org.infinispan.commands.FlagAffectedCommand;
import org.infinispan.commands.read.GetKeyValueCommand;
import org.infinispan.commands.write.InvalidateCommand;
import org.infinispan.commands.write.PutKeyValueCommand;
import org.infinispan.commands.write.RemoveCommand;
import org.infinispan.commands.write.ReplaceCommand;
import org.infinispan.container.EntryFactory;
import org.infinispan.container.entries.CacheEntry;
import org.infinispan.container.entries.InternalCacheEntry;
import org.infinispan.container.entries.MVCCEntry;
import org.infinispan.context.Flag;
import org.infinispan.context.InvocationContext;
import org.infinispan.factories.annotations.Inject;
import org.infinispan.factories.annotations.Start;
import org.infinispan.interceptors.base.JmxStatsCommandInterceptor;
import org.infinispan.jmx.annotations.MBean;
import org.infinispan.jmx.annotations.ManagedAttribute;
import org.infinispan.jmx.annotations.ManagedOperation;
import org.infinispan.loaders.CacheLoader;
import org.infinispan.loaders.CacheLoaderManager;
import org.infinispan.notifications.cachelistener.CacheNotifier;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
import org.rhq.helpers.pluginAnnotations.agent.MeasurementType;
import org.rhq.helpers.pluginAnnotations.agent.Metric;
import org.rhq.helpers.pluginAnnotations.agent.Operation;
import java.util.concurrent.atomic.AtomicLong;
@MBean(objectName = "CacheLoader", description = "Component that handles loading entries from a CacheStore into memory.")
public class CacheLoaderInterceptor extends JmxStatsCommandInterceptor {
private final AtomicLong cacheLoads = new AtomicLong(0);
private final AtomicLong cacheMisses = new AtomicLong(0);
protected CacheLoaderManager clm;
protected CacheNotifier notifier;
protected CacheLoader loader;
private EntryFactory entryFactory;
private static final Log log = LogFactory.getLog(CacheLoaderInterceptor.class);
@Override
protected Log getLog() {
return log;
}
@Inject
protected void injectDependencies(CacheLoaderManager clm, EntryFactory entryFactory, CacheNotifier notifier) {
this.clm = clm;
this.notifier = notifier;
this.entryFactory = entryFactory;
}
@Start(priority = 15)
protected void startInterceptor() {
loader = clm.getCacheLoader();
}
@Override
public Object visitPutKeyValueCommand(InvocationContext ctx, PutKeyValueCommand command) throws Throwable {
Object key;
if ((key = command.getKey()) != null) {
loadIfNeeded(ctx, key, false, command);
}
return invokeNextInterceptor(ctx, command);
}
@Override
public Object visitGetKeyValueCommand(InvocationContext ctx, GetKeyValueCommand command) throws Throwable {
Object key;
if ((key = command.getKey()) != null) {
loadIfNeededAndUpdateStats(ctx, key, true, command);
}
return invokeNextInterceptor(ctx, command);
}
@Override
public Object visitInvalidateCommand(InvocationContext ctx, InvalidateCommand command) throws Throwable {
Object[] keys;
if ((keys = command.getKeys()) != null && keys.length > 0) {
for (Object key : command.getKeys()) {
loadIfNeeded(ctx, key, false, command);
}
}
return invokeNextInterceptor(ctx, command);
}
@Override
public Object visitRemoveCommand(InvocationContext ctx, RemoveCommand command) throws Throwable {
Object key;
if ((key = command.getKey()) != null) {
loadIfNeededAndUpdateStats(ctx, key, false, command);
}
return invokeNextInterceptor(ctx, command);
}
@Override
public Object visitReplaceCommand(InvocationContext ctx, ReplaceCommand command) throws Throwable {
Object key;
if ((key = command.getKey()) != null) {
loadIfNeededAndUpdateStats(ctx, key, false, command);
}
return invokeNextInterceptor(ctx, command);
}
protected boolean isPrimaryOwner(Object key) {
return false;
}
private boolean loadIfNeeded(InvocationContext ctx, Object key, boolean isRetrieval, FlagAffectedCommand cmd) throws Throwable {
if (cmd.hasFlag(Flag.SKIP_CACHE_STORE) || cmd.hasFlag(Flag.SKIP_CACHE_LOAD)) {
return false; //skip operation
}
// If this is a remote call, skip loading UNLESS we are the coordinator/primary data owner of this key, and
// are using eviction or write skew checking.
if (!isRetrieval && !ctx.isOriginLocal() && !isPrimaryOwner(key)) return false;
// first check if the container contains the key we need. Try and load this into the context.
CacheEntry e = ctx.lookupEntry(key);
if (e == null || e.isNull() || e.getValue() == null) {
InternalCacheEntry loaded = loader.load(key);
if (loaded != null) {
MVCCEntry mvccEntry = entryFactory.wrapEntryForPut(ctx, key, loaded, false);
recordLoadedEntry(ctx, key, mvccEntry, loaded);
return true;
} else {
return false;
}
} else {
return true;
}
}
/**
* This method records a loaded entry, performing the following steps: <ol> <li>Increments counters for reporting via
* JMX</li> <li>updates the 'entry' reference (an entry in the current thread's InvocationContext) with the contents
* of 'loadedEntry' (freshly loaded from the CacheStore) so that the loaded details will be flushed to the
* DataContainer when the call returns (in the LockingInterceptor, when locks are released)</li> <li>Notifies
* listeners</li> </ol>
*
* @param ctx the current invocation's context
* @param key key to record
* @param entry the appropriately locked entry in the caller's context
* @param loadedEntry the internal entry loaded from the cache store.
*/
private MVCCEntry recordLoadedEntry(InvocationContext ctx, Object key, MVCCEntry entry, InternalCacheEntry loadedEntry) throws Exception {
boolean entryExists = loadedEntry != null;
if (log.isTraceEnabled()) {
log.trace("Entry exists in loader? " + entryExists);
}
if (getStatisticsEnabled()) {
if (entryExists) {
cacheLoads.incrementAndGet();
} else {
cacheMisses.incrementAndGet();
}
}
if (entryExists) {
final Object value = loadedEntry.getValue();
// FIXME: There's no point to trigger the entryLoaded/Activated event twice.
sendNotification(key, value, true, ctx);
entry.setValue(value);
entry.setLifespan(loadedEntry.getLifespan());
entry.setMaxIdle(loadedEntry.getMaxIdle());
// TODO shouldn't we also be setting last used and created timestamps?
entry.setValid(true);
sendNotification(key, value, false, ctx);
}
return entry;
}
protected void sendNotification(Object key, Object value, boolean pre, InvocationContext ctx) {
notifier.notifyCacheEntryLoaded(key, value, pre, ctx);
}
private void loadIfNeededAndUpdateStats(InvocationContext ctx, Object key, boolean isRetrieval, FlagAffectedCommand cmd) throws Throwable {
boolean found = loadIfNeeded(ctx, key, isRetrieval, cmd);
if (!found && getStatisticsEnabled()) {
cacheMisses.incrementAndGet();
}
}
@ManagedAttribute(description = "Number of entries loaded from cache store")
@Metric(displayName = "Number of cache store loads", measurementType = MeasurementType.TRENDSUP)
public long getCacheLoaderLoads() {
return cacheLoads.get();
}
@ManagedAttribute(description = "Number of entries that did not exist in cache store")
@Metric(displayName = "Number of cache store load misses", measurementType = MeasurementType.TRENDSUP)
public long getCacheLoaderMisses() {
return cacheMisses.get();
}
@Override
@ManagedOperation(description = "Resets statistics gathered by this component")
@Operation(displayName = "Reset Statistics")
public void resetStatistics() {
cacheLoads.set(0);
cacheMisses.set(0);
}
}