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/**
* Copyright Terracotta, Inc.
*
* Licensed 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 net.sf.ehcache.distribution;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.Element;
import net.sf.ehcache.Status;
import java.io.Serializable;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Listens to {@link net.sf.ehcache.CacheManager} and {@link net.sf.ehcache.Cache} events and propagates those to
* {@link CachePeer} peers of the Cache.
*
* @author Greg Luck
* @version $Id: RMISynchronousCacheReplicator.java 5631 2012-05-10 08:31:33Z teck $
*/
public class RMISynchronousCacheReplicator implements CacheReplicator {
private static final Logger LOG = LoggerFactory.getLogger(RMISynchronousCacheReplicator.class.getName());
/**
* The status of the replicator. Only replicates when STATUS_ALIVE
*/
protected Status status;
/**
* Whether to replicate puts.
*/
protected final boolean replicatePuts;
/**
* Whether a put should replicated by copy or by invalidation, (a remove).
*
* By copy is best when the entry is expensive to produce. By invalidation is best when
* we are really trying to force other caches to sync back to a canonical source like a database.
* An example of a latter usage would be a read/write cache being used in Hibernate.
*
* This setting only has effect if #replicateUpdates is true.
*/
protected boolean replicatePutsViaCopy;
/**
* Whether to replicate updates.
*/
protected final boolean replicateUpdates;
/**
* Whether an update (a put) should be by copy or by invalidation, (a remove).
*
* By copy is best when the entry is expensive to produce. By invalidation is best when
* we are really trying to force other caches to sync back to a canonical source like a database.
* An example of a latter usage would be a read/write cache being used in Hibernate.
*
* This setting only has effect if #replicateUpdates is true.
*/
protected final boolean replicateUpdatesViaCopy;
/**
* Whether to replicate removes
*/
protected final boolean replicateRemovals;
/**
* Constructor for internal and subclass use
*
* @param replicatePuts
* @param replicateUpdates
* @param replicateUpdatesViaCopy
* @param replicateRemovals
*/
public RMISynchronousCacheReplicator(
boolean replicatePuts,
boolean replicatePutsViaCopy,
boolean replicateUpdates,
boolean replicateUpdatesViaCopy,
boolean replicateRemovals) {
this.replicatePuts = replicatePuts;
this.replicatePutsViaCopy = replicatePutsViaCopy;
this.replicateUpdates = replicateUpdates;
this.replicateUpdatesViaCopy = replicateUpdatesViaCopy;
this.replicateRemovals = replicateRemovals;
status = Status.STATUS_ALIVE;
}
/**
* Called immediately after an element has been put into the cache. The {@link net.sf.ehcache.Cache#put(net.sf.ehcache.Element)} method
* will block until this method returns.
*
* Implementers may wish to have access to the Element's fields, including value, so the element is provided.
* Implementers should be careful not to modify the element. The effect of any modifications is undefined.
*
* @param cache the cache emitting the notification
* @param element the element which was just put into the cache.
*/
public void notifyElementPut(final Ehcache cache, final Element element) throws CacheException {
if (notAlive()) {
return;
}
if (!replicatePuts) {
return;
}
if (!element.isSerializable()) {
if (LOG.isWarnEnabled()) {
LOG.warn("Object with key " + element.getObjectKey() + " is not Serializable and cannot be replicated");
}
return;
}
if (replicatePutsViaCopy) {
replicatePutNotification(cache, element);
} else {
replicateRemovalNotification(cache, (Serializable) element.getObjectKey());
}
}
/**
* Does the actual RMI remote call.
*
* If a Throwable occurs a SEVERE log message will be logged, but attempts to replicate to the other
* peers will continue.
*/
protected static void replicatePutNotification(Ehcache cache, Element element) throws RemoteCacheException {
List cachePeers = listRemoteCachePeers(cache);
for (Object cachePeer1 : cachePeers) {
CachePeer cachePeer = (CachePeer) cachePeer1;
try {
cachePeer.put(element);
} catch (Throwable t) {
LOG.error("Exception on replication of putNotification. " + t.getMessage() + ". Continuing...", t);
}
}
}
/**
* Called immediately after an element has been put into the cache and the element already
* existed in the cache. This is thus an update.
*
* The {@link net.sf.ehcache.Cache#put(net.sf.ehcache.Element)} method
* will block until this method returns.
*
* Implementers may wish to have access to the Element's fields, including value, so the element is provided.
* Implementers should be careful not to modify the element. The effect of any modifications is undefined.
*
* @param cache the cache emitting the notification
* @param element the element which was just put into the cache.
*/
public void notifyElementUpdated(final Ehcache cache, final Element element) throws CacheException {
if (notAlive()) {
return;
}
if (!replicateUpdates) {
return;
}
if (replicateUpdatesViaCopy) {
if (!element.isSerializable()) {
if (LOG.isWarnEnabled()) {
LOG.warn("Object with key " + element.getObjectKey()
+ " is not Serializable and cannot be updated via copy");
}
return;
}
replicatePutNotification(cache, element);
} else {
if (!element.isKeySerializable()) {
if (LOG.isWarnEnabled()) {
LOG.warn("Key " + element.getObjectKey() + " is not Serializable and cannot be replicated.");
}
return;
}
replicateRemovalNotification(cache, (Serializable) element.getObjectKey());
}
}
/**
* Called immediately after an attempt to remove an element. The remove method will block until
* this method returns.
*
* This notification is received regardless of whether the cache had an element matching
* the removal key or not. If an element was removed, the element is passed to this method,
* otherwise a synthetic element, with only the key set is passed in.
*
*
* @param cache the cache emitting the notification
* @param element the element just deleted, or a synthetic element with just the key set if
* no element was removed.param element just deleted
*/
public void notifyElementRemoved(final Ehcache cache, final Element element) throws CacheException {
if (notAlive()) {
return;
}
if (!replicateRemovals) {
return;
}
if (!element.isKeySerializable()) {
if (LOG.isWarnEnabled()) {
LOG.warn("Key " + element.getObjectKey() + " is not Serializable and cannot be replicated.");
}
return;
}
replicateRemovalNotification(cache, (Serializable) element.getObjectKey());
}
/**
* Does the actual RMI remote call.
*
* If a Throwable occurs a SEVERE log message will be logged, but attempts to replicate to the other
* peers will continue.
*/
protected static void replicateRemovalNotification(Ehcache cache, Serializable key) throws RemoteCacheException {
List cachePeers = listRemoteCachePeers(cache);
for (Object cachePeer1 : cachePeers) {
CachePeer cachePeer = (CachePeer) cachePeer1;
try {
cachePeer.remove(key);
} catch (Throwable t) {
LOG.error("Exception on replication of removeNotification. " + t.getMessage() + ". Continuing...", t);
}
}
}
/**
* {@inheritDoc}
*
* This implementation does not propagate expiries. It does not need to do anything because the element will
* expire in the remote cache at the same time. If the remote peer is not configured the same way they should
* not be in an cache cluster.
*/
public final void notifyElementExpired(final Ehcache cache, final Element element) {
/*do not propagate expiries. The element should expire in the remote cache at the same time, thus
preseerving coherency.
*/
}
/**
* Called immediately after an element is evicted from the cache. Evicted in this sense
* means evicted from one store and not moved to another, so that it exists nowhere in the
* local cache.
*
* In a sense the Element has been removed from the cache, but it is different,
* thus the separate notification.
*
* This replicator does not propagate these events
*
* @param cache the cache emitting the notification
* @param element the element that has just been evicted
*/
public void notifyElementEvicted(final Ehcache cache, final Element element) {
/**
* do not notify these
*/
}
/**
* Called during {@link net.sf.ehcache.Ehcache#removeAll()} to indicate that the all
* elements have been removed from the cache in a bulk operation. The usual
* {@link #notifyElementRemoved(net.sf.ehcache.Ehcache,net.sf.ehcache.Element)}
* is not called.
*
* This notification exists because clearing a cache is a special case. It is often
* not practical to serially process notifications where potentially millions of elements
* have been bulk deleted.
*
* @param cache the cache emitting the notification
*/
public void notifyRemoveAll(final Ehcache cache) {
if (notAlive()) {
return;
}
if (!replicateRemovals) {
return;
}
replicateRemoveAllNotification(cache);
}
/**
* Does the actual RMI remote call.
*
* If a Throwable occurs a SEVERE log message will be logged, but attempts to replicate to the other
* peers will continue.
*
*/
protected void replicateRemoveAllNotification(Ehcache cache) {
List cachePeers = listRemoteCachePeers(cache);
for (Object cachePeer1 : cachePeers) {
CachePeer cachePeer = (CachePeer) cachePeer1;
try {
cachePeer.removeAll();
} catch (Throwable t) {
LOG.error("Exception on replication of removeAllNotification. " + t.getMessage() + ". Continuing...", t);
}
}
}
/**
* Package protected List of cache peers
*
* @param cache
* @return a list of {@link CachePeer} peers for the given cache, excluding the local peer.
*/
static List listRemoteCachePeers(Ehcache cache) {
CacheManagerPeerProvider provider = cache.getCacheManager().getCacheManagerPeerProvider("RMI");
return provider.listRemoteCachePeers(cache);
}
/**
* @return whether update is through copy or invalidate
*/
public final boolean isReplicateUpdatesViaCopy() {
return replicateUpdatesViaCopy;
}
/**
* Asserts that the replicator is active.
*
* @return true if the status is not STATUS_ALIVE
*/
public final boolean notAlive() {
return !alive();
}
/**
* Checks that the replicator is is STATUS_ALIVE.
*/
public final boolean alive() {
if (status == null) {
return false;
} else {
return (status.equals(Status.STATUS_ALIVE));
}
}
/**
* Give the replicator a chance to cleanup and free resources when no longer needed
*/
public void dispose() {
status = Status.STATUS_SHUTDOWN;
}
/**
* Creates a clone of this listener. This method will only be called by ehcache before a cache is initialized.
*
* This may not be possible for listeners after they have been initialized. Implementations should throw
* CloneNotSupportedException if they do not support clone.
*
* @return a clone
* @throws CloneNotSupportedException if the listener could not be cloned.
*/
public Object clone() throws CloneNotSupportedException {
//shutup checkstyle
super.clone();
return new RMISynchronousCacheReplicator(replicatePuts, replicatePutsViaCopy, replicateUpdates,
replicateUpdatesViaCopy, replicateRemovals);
}
}
