Configuration
Message Queue Configuration
Each cluster needs to use a fixed topic name for replication. Set up a topic using the tools in your message queue. Out of the box, both ActiveMQ and Open MQ support auto creation of destinations, so this step may be optional.
Ehcache Configuration
Configuration is done in the ehcache.xml.
There are two things to configure:
The JMSCacheManagerPeerProviderFactory which is done once per CacheManager and therefore once per ehcache.xml file.
The JMSCacheReplicatorFactory which is added to each cache's configuration if you want that cache replicated.
The main configuration happens in the JGroupsCacheManagerPeerProviderFactory connect sub-property. A connect property is passed directly to the JGroups channel and therefore all the protocol stacks and options available in JGroups can be set.
Configuring the JMSCacheManagerPeerProviderFactory
Following is the configuration instructions as it appears in the sample ehcache.xml shipped with ehcache:
{Configuring JMS replication}.
===========================
The JMS PeerProviderFactory uses JNDI to maintain message queue independence.
Refer to the manual for full configuration examples using ActiveMQ and Open Message Queue.
Valid properties are:
* initialContextFactoryName (mandatory) - the name of the factory used to create
* the message queue initial context.
* providerURL (mandatory) - the JNDI configuration information for the service
* provider to use.
* topicConnectionFactoryBindingName (mandatory) - the JNDI binding name for the
* TopicConnectionFactory
* topicBindingName (mandatory) - the JNDI binding name for the topic name
* securityPrincipalName - the JNDI java.naming.security.principal
* securityCredentials - the JNDI java.naming.security.credentials
* urlPkgPrefixes - the JNDI java.naming.factory.url.pkgs
* userName - the user name to use when creating the TopicConnection to the
* Message Queue
* password - the password to use when creating the TopicConnection to the Message
* Queue
* acknowledgementMode - the JMS Acknowledgement mode for both publisher and
* subscriber.
The available choices are
AUTO_ACKNOWLEDGE, DUPS_OK_ACKNOWLEDGE and SESSION_TRANSACTED.
The default is AUTO_ACKNOWLEDGE.
* listenToTopic - true or false. If false, this cache will send to the JMS topic
* but will not listen for updates.
* Default is true.
Example - JMSCacheManagerPeerProviderFactory for Active MQ
This configuration works with Active MQ out of the box.
<cacheManagerPeerProviderFactory
class="net.sf.ehcache.distribution.jms.JMSCacheManagerPeerProviderFactory"
properties="initialContextFactoryName=ExampleActiveMQInitialContextFactory,
providerURL=tcp://localhost:61616,
topicConnectionFactoryBindingName=topicConnectionFactory,
topicBindingName=ehcache"
propertySeparator=","
/>
You need to provide your own ActiveMQInitialContextFactory for the initialContextFactoryName. An example which should work for most purposes is:
public class ExampleActiveMQInitialContextFactory
extends ActiveMQInitialContextFactory {
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings("unchecked")
public Context getInitialContext(Hashtable environment)
throws NamingException
{
Map<String, Object> data = new ConcurrentHashMap<String, Object>();
String factoryBindingName =
(String)environment.get(JMSCacheManagerPeerProviderFactory
.TOPIC_CONNECTION_FACTORY_BINDING_NAME);
try {
data.put(factoryBindingName, createConnectionFactory(environment));
} catch (URISyntaxException e) {
throw new NamingException("Error initialisating ConnectionFactory"
+ " with message "
+ e.getMessage());
}
String topicBindingName =
(String)environment.get(JMSCacheManagerPeerProviderFactory
.TOPIC_BINDING_NAME);
data.put(topicBindingName, createTopic(topicBindingName));
return createContext(environment, data);
}
}
Example - JMSCacheManagerPeerProviderFactory for Open MQ
This configuration works with an out of the box Open MQ.
<cacheManagerPeerProviderFactory
class="net.sf.ehcache.distribution.jms.JMSCacheManagerPeerProviderFactory"
properties="initialContextFactoryName=
com.sun.jndi.fscontext.RefFSContextFactory,
providerURL=file:///tmp,
topicConnectionFactoryBindingName=MyConnectionFactory,
topicBindingName=ehcache"
propertySeparator=","
/>
To set up the Open MQ file system initial context to work with this example use the following imqobjmgr commands to create the requires objects in the context.
imqobjmgr add -t tf -l 'MyConnectionFactory' -j java.naming.provider.url \
=file:///tmp -j java.naming.factory.initial=com.sun.jndi.fscontext.RefFSContextFactory -f
imqobjmgr add -t t -l 'ehcache' -o 'imqDestinationName=EhcacheTopicDest'
-j java.naming.provider.url\
=file:///tmp -j java.naming.factory.initial=com.sun.jndi.fscontext.RefFSContextFactory -f
Configuring the JMSCacheReplicatorFactory
This is the same as configuring any of the cache replicators. The class should be net.sf.ehcache.distribution.jms.JMSCacheReplicatorFactory.
See the following example:
<cache name="sampleCacheAsync"
maxEntriesLocalHeap="1000"
eternal="false"
timeToIdleSeconds="1000"
timeToLiveSeconds="1000"
overflowToDisk="false">
<cacheEventListenerFactory
class="net.sf.ehcache.distribution.jms.JMSCacheReplicatorFactory"
properties="replicateAsynchronously=true,
replicatePuts=true,
replicateUpdates=true,
replicateUpdatesViaCopy=true,
replicateRemovals=true,
asynchronousReplicationIntervalMillis=1000"
propertySeparator=","/>
</cache>
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