Ehcache Distributed Cache implementation

Opening

ehcache提供三种网络连接策略来实现集群，rmi,jgroup还有jms。同时ehcache可以可以实现多播的方式实现集群,也可以手动指定集群主机序列实现集群。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.    环境为两台机器 server1 ip：192.168.2.154，server2 ip：192.168.2.23

RMI mode

RMI Mode configuration Essentials (below are the configuration on the Server1, server2 only need to convert the IP)

a. 配置PeerProvider：Xml代码

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

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  = "+"  > <cacheeventlistenerfactory  class  = " Net.sf.ehcache.distribution.RMICacheReplicatorFactory " properties  =< Span class= "Hljs-value" "Replicateasynchronously=true, Replicateputs=true, Replicateupdates=true, Replicateupdatesviacopy= false, Replicateremovals= true "/> 

属性解释：必须属性：        name:设置缓存的名称，用于标志缓存,惟一        maxElementsInMemory:在内存中最大的对象数量        maxElementsOnDisk：在DiskStore中的最大对象数量，如为0，则没有限制        eternal：设置元素是否永久的，如果为永久，则timeout忽略        overflowToDisk：是否当memory中的数量达到限制后，保存到Disk可选的属性：        timeToIdleSeconds：设置元素过期前的空闲时间        timeToLiveSeconds：设置元素过期前的活动时间        diskPersistent：是否disk store在虚拟机启动时持久化。默认为false   diskExpiryThreadIntervalSeconds:运行disk终结线程的时间，默认为120秒        memoryStoreEvictionPolicy：策略关于Eviction缓存子元素：    cacheEventListenerFactory：注册相应的的缓存监听类，用于处理缓存事件，如put,remove,update,和expirebootstrapCacheLoaderFactory:指定相应的BootstrapCacheLoader，用于在初始化缓存，以及自动设置。

JGroups Way

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="::" />

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  = diskexpirythreadintervalseconds  = "+"  > <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];p ort_range=10;timeout=3000;num_initial_members=3;up_thread=true;down_thread=true): Verify_suspect (timeout=1500;down_thread=false;up_thread=false):p bcast. Nakack (down_thread=true;up_thread=true;gc_lag=100;retransmit_timeout=3000):p bcast. 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  = diskexpirythreadintervalseconds  = "+"  > <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  = diskexpirythreadintervalseconds  = "+"  > <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  = diskexpirythreadintervalseconds  = "+"  > <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 " Span class= "Hljs-attribute" >overflowtodisk  = "true"  timetoidleseconds  = "0"  timetoliveseconds  = "0"  diskpersistent  = diskexpirythreadintervalseconds  = "+"  > <cacheeventlistenerfactory class=" Net.sf.ehcache.distribution.jgroups.JGroupsCacheReplicatorFactory "Properties=" Replicateasynchronously=true, Replicateputs=true,replicateupdates=true, Replicateupdatesviacopy=false, Replicateremovals=true "/></Cache></ehcache>

End

The distributed cache support for Ehcache can be accomplished in either of these ways.

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Ehcache Distributed Cache implementation