Ehcache支持的分布式缓存支持有三种RMI，JGroups，JMS，这里介绍下MRI和JGrpups两种方式，Ehcache使用版本为 1.5.0，关于ehcache的其他信息请参考http://ehcache.sourceforge.net /EhcacheUserGuide.html，关于jgroups的信息请参考http://www.jgroups.org/manual /html_single/index.html。
环境为两台机器 server1 ip：192.168.2.154，server2 ip：192.168.2.23
1. RMI方式：
rmi的方式配置要点（下面均是server1上的配置，server2上的只需要把ip兑换即可）
a. 配置PeerProvider：
Xml代码 < cacheManagerPeerProviderFactory class = "net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory" properties = "peerDiscovery=manual,rmiUrls=//192.168.2.23:40001/userCache|//192.168.2.23:40001/resourceCache" /> <cacheManagerPeerProviderFactory class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory" properties="peerDiscovery=manual,rmiUrls=//192.168.2.23:40001/userCache|//192.168.2.23:40001/resourceCache" />
配置中通过手动方式同步sever2中的userCache和resourceCache。
b. 配置CacheManagerPeerListener：
Xml代码 < cacheManagerPeerListenerFactory class = "net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory" properties = "hostName=192.168.2.154, port=40001,socketTimeoutMillis=2000" /> <cacheManagerPeerListenerFactory class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory" properties="hostName=192.168.2.154, port=40001,socketTimeoutMillis=2000" />
配置中server1监听本机40001端口。
c. 在每一个cache中添加cacheEventListener，例子如下：
Xml代码 < cache name = "userCache" maxElementsInMemory = "10000" eternal = "true" overflowToDisk = "true" timeToIdleSeconds = "0" timeToLiveSeconds = "0" diskPersistent = "false" diskExpiryThreadIntervalSeconds = "120" > < cacheEventListenerFactory class = "net.sf.ehcache.distribution.RMICacheReplicatorFactory" properties = "replicateAsynchronously=true, replicatePuts=true, replicateUpdates=true,replicateUpdatesViaCopy= false, replicateRemovals= true " /> </ cache > <cache name="userCache" maxElementsInMemory="10000" eternal="true" overflowToDisk="true" timeToIdleSeconds="0" timeToLiveSeconds="0" diskPersistent="false" diskExpiryThreadIntervalSeconds="120"> <cacheEventListenerFactory class="net.sf.ehcache.distribution.RMICacheReplicatorFactory" properties="replicateAsynchronously=true, replicatePuts=true, replicateUpdates=true,replicateUpdatesViaCopy= false, replicateRemovals= true " /> </cache>
2. JGroups方式：
ehcache 1.5.0之后版本支持的一种方式，配置起来比较简单，要点：
a. 配置PeerProvider，使用tcp的方式，例子如下：
Xml代码 < cacheManagerPeerProviderFactory class = "net.sf.ehcache.distribution.jgroups.JGroupsCacheManagerPeerProviderFactory" properties =" connect = TCP ( start_port = 7800 ): TCPPING(initial_hosts = 192 .168.2.154[7800],192.168.2.23[7800]; port_range = 10 ; timeout = 3000 ; num_initial_members = 3 ; up_thread = true ; down_thread = true ): VERIFY_SUSPECT(timeout = 1500 ; down_thread = false ; up_thread = false ): pbcast.NAKACK(down_thread = true ; up_thread = true ; gc_lag = 100 ; retransmit_timeout = 3000 ): pbcast.GMS(join_timeout = 5000 ; join_retry_timeout = 2000 ; shun = false ; print_local_addr = false ; down_thread = true ; up_thread = true )" propertySeparator = "::" /> <cacheManagerPeerProviderFactory class="net.sf.ehcache.distribution.jgroups.JGroupsCacheManagerPeerProviderFactory" properties="connect=TCP(start_port=7800): TCPPING(initial_hosts=192.168.2.154[7800],192.168.2.23[7800];port_range=10;timeout=3000; num_initial_members=3;up_thread=true;down_thread=true): VERIFY_SUSPECT(timeout=1500;down_thread=false;up_thread=false): pbcast.NAKACK(down_thread=true;up_thread=true;gc_lag=100;retransmit_timeout=3000): pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;shun=false; print_local_addr=false;down_thread=true;up_thread=true)" propertySeparator="::" />
b.为每个cache添加cacheEventListener：
Xml代码 < cache name = "userCache" maxElementsInMemory = "10000" eternal = "true" overflowToDisk = "true" timeToIdleSeconds = "0" timeToLiveSeconds = "0" diskPersistent = "false" diskExpiryThreadIntervalSeconds = "120" > < cacheEventListenerFactory class = "net.sf.ehcache.distribution.jgroups.JGroupsCacheReplicatorFactory" properties =" replicateAsynchronously = true , replicatePuts = true , replicateUpdates = true , replicateUpdatesViaCopy = false , replicateRemovals = true " /> </ cache > <cache name="userCache" maxElementsInMemory="10000" eternal="true" overflowToDisk="true" timeToIdleSeconds="0" timeToLiveSeconds="0" diskPersistent="false" diskExpiryThreadIntervalSeconds="120"> <cacheEventListenerFactory class="net.sf.ehcache.distribution.jgroups.JGroupsCacheReplicatorFactory" properties="replicateAsynchronously=true, replicatePuts=true, replicateUpdates=true, replicateUpdatesViaCopy=false, replicateRemovals=true"/> </cache>
JGroup方式配置的两个server上的配置文件一样，若有多个server，在initial_hosts中将server ip加上即可。
一个完整的ehcache.xml文件：
Xml代码 <? xml version = "1.0" encoding = "UTF-8" ?> < ehcache xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation = "http://ehcache.sf.net/ehcache.xsd" > < diskStore path = "java.io.tmpdir" /> < cacheManagerPeerProviderFactory class = "net.sf.ehcache.distribution.jgroups.JGroupsCacheManagerPeerProviderFactory" properties =" connect = TCP ( start_port = 7800 ): TCPPING(initial_hosts = 192 .168.2.154[7800],192.168.2.23[7800]; port_range = 10 ; timeout = 3000 ; num_initial_members = 3 ; up_thread = true ; down_thread = true ): VERIFY_SUSPECT(timeout = 1500 ; down_thread = false ; up_thread = false ): pbcast.NAKACK(down_thread = true ; up_thread = true ; gc_lag = 100 ; retransmit_timeout = 3000 ): pbcast.GMS(join_timeout = 5000 ; join_retry_timeout = 2000 ; shun = false ; print_local_addr = false ; down_thread = true ; up_thread = true )" propertySeparator = "::" /> < defaultCache maxElementsInMemory = "10000" eternal = "true" overflowToDisk = "true" timeToIdleSeconds = "0" timeToLiveSeconds = "0" diskPersistent = "false" diskExpiryThreadIntervalSeconds = "120" > < cacheEventListenerFactory class = "net.sf.ehcache.distribution.jgroups.JGroupsCacheReplicatorFactory" properties =" replicateAsynchronously = true , replicatePuts = true , replicateUpdates = true , replicateUpdatesViaCopy = false , replicateRemovals = true " /> </ defaultCache > < cache name = "velcroCache" maxElementsInMemory = "10000" eternal = "true" overflowToDisk = "true" timeToIdleSeconds = "0" timeToLiveSeconds = "0" diskPersistent = "false" diskExpiryThreadIntervalSeconds = "120" > < cacheEventListenerFactory class = "net.sf.ehcache.distribution.jgroups.JGroupsCacheReplicatorFactory" properties =" replicateAsynchronously = true , replicatePuts = true , replicateUpdates = true , replicateUpdatesViaCopy = false , replicateRemovals = true " /> </ cache > < cache name = "userCache" maxElementsInMemory = "10000" eternal = "true" overflowToDisk = "true" timeToIdleSeconds = "0" timeToLiveSeconds = "0" diskPersistent = "false" diskExpiryThreadIntervalSeconds = "120" > < cacheEventListenerFactory class = "net.sf.ehcache.distribution.jgroups.JGroupsCacheReplicatorFactory" properties =" replicateAsynchronously = true , replicatePuts = true , replicateUpdates = true , replicateUpdatesViaCopy = false , replicateRemovals = true " /> </ cache > < cache name = "resourceCache" maxElementsInMemory = "10000" eternal = "true" overflowToDisk = "true" timeToIdleSeconds = "0" timeToLiveSeconds = "0" diskPersistent = "false" diskExpiryThreadIntervalSeconds = "120" > < cacheEventListenerFactory class = "net.sf.ehcache.distribution.jgroups.JGroupsCacheReplicatorFactory" properties =" replicateAsynchronously = true , replicatePuts = true , replicateUpdates = true , replicateUpdatesViaCopy = false , replicateRemovals = true " /> </ cache > </ ehcache >