ehcache.xml

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    i.e. The maximum time between creation time and when an element expires.
    Is only used if the element is not eternal.
    Optional attribute. A value of 0 means that and Element can live for infinity.
    The default value is 0.

    diskPersistent:
    Whether the disk store persists between restarts of the Virtual Machine.
    The default value is false.

    diskExpiryThreadIntervalSeconds:
    The number of seconds between runs of the disk expiry thread. The default value
    is 120 seconds.

    memoryStoreEvictionPolicy:
    Policy would be enforced upon reaching the maxElementsInMemory limit. Default
    policy is Least Recently Used (specified as LRU). Other policies available -
    First In First Out (specified as FIFO) and Less Frequently Used
    (specified as LFU)

    Cache elements can also contain sub elements which take the same format of a factory class
    and properties. Defined sub-elements are:

    * cacheEventListenerFactory - Enables registration of listeners for cache events, such as
      put, remove, update, and expire.

    * bootstrapCacheLoaderFactory - Specifies a BootstrapCacheLoader, which is called by a
      cache on initialisation to prepopulate itself.

    Each cache that will be distributed needs to set a cache event listener which replicates
    messages to the other CacheManager peers. For the built-in RMI implementation this is done
    by adding a cacheEventListenerFactory element of type RMICacheReplicatorFactory to each
    distributed cache's configuration as per the following example:

    <cacheEventListenerFactory class="net.sf.ehcache.distribution.RMICacheReplicatorFactory"
         properties="replicateAsynchronously=true,
         replicatePuts=true,
         replicateUpdates=true,
         replicateUpdatesViaCopy=true,
         replicateRemovals=true "/>

    The RMICacheReplicatorFactory recognises the following properties:

    * replicatePuts=true|false - whether new elements placed in a cache are
      replicated to others. Defaults to true.

    * replicateUpdates=true|false - whether new elements which override an
      element already existing with the same key are replicated. Defaults to true.

    * replicateRemovals=true - whether element removals are replicated. Defaults to true.

    * replicateAsynchronously=true | false - whether replications are
      asynchronous (true) or synchronous (false). Defaults to true.

    * replicateUpdatesViaCopy=true | false - whether the new elements are
      copied to other caches (true), or whether a remove message is sent. Defaults to true.

    * asynchronousReplicationIntervalMillis=<number of milliseconds> - The asynchronous
      replicator runs at a set interval of milliseconds. The default is 1000. The minimum
      is 10. This property is only applicable if replicateAsynchronously=true

    The RMIBootstrapCacheLoader bootstraps caches in clusters where RMICacheReplicators are
    used. It is configured as per the following example:

    <bootstrapCacheLoaderFactory
        class="net.sf.ehcache.distribution.RMIBootstrapCacheLoaderFactory"
        properties="bootstrapAsynchronously=true, maximumChunkSizeBytes=5000000"/>

    The RMIBootstrapCacheLoaderFactory recognises the following optional properties:

    * bootstrapAsynchronously=true|false - whether the bootstrap happens in the background
      after the cache has started. If false, bootstrapping must complete before the cache is
      made available. The default value is true.

    * maximumChunkSizeBytes=<integer> - Caches can potentially be very large, larger than the
      memory limits of the VM. This property allows the bootstraper to fetched elements in
      chunks. The default chunk size is 5000000 (5MB).

    -->

    <!--
    Mandatory Default Cache configuration. These settings will be applied to caches
    created programmtically using CacheManager.add(String cacheName)
    timeToIdleSeconds  对象空闲N秒后失效
    timeToLiveSeconds 对象总共存活时间
    -->
    <defaultCache
            maxElementsInMemory="12345"
            eternal="false"
            timeToIdleSeconds="1200" 
            timeToLiveSeconds="1200"
            overflowToDisk="true"
            maxElementsOnDisk="10000000"
            diskPersistent="false"
            diskExpiryThreadIntervalSeconds="120"
            memoryStoreEvictionPolicy="LRU"
            />
    <!--
    Sample caches. Following are some example caches. Remove these before use.
    -->

    <!--
    Sample cache named sampleCache1
    This cache contains a maximum in memory of 10000 elements, and will expire
    an element if it is idle for more than 5 minutes and lives for more than
    10 minutes.

    If there are more than 10000 elements it will overflow to the
    disk cache, which in this configuration will go to wherever java.io.tmp is
    defined on your system. On a standard Linux system this will be /tmp"
   
    <cache name="sampleCache1"
           maxElementsInMemory="10000"
           maxElementsOnDisk="1000"
           eternal="false"
           overflowToDisk="true"
           timeToIdleSeconds="300"
           timeToLiveSeconds="600"
           memoryStoreEvictionPolicy="LFU"
            />
 -->

    <!--
    Sample cache named sampleCache2
    This cache has a maximum of 1000 elements in memory. There is no overflow to disk, so 1000
    is also the maximum cache size. Note that when a cache is eternal, timeToLive and
    timeToIdle are not used and do not need to be specified.
    
    <cache name="sampleCache2"
           maxElementsInMemory="1000"
           eternal="true"
           overflowToDisk="false"
           memoryStoreEvictionPolicy="FIFO"
            />
-->

    <!--
    Sample cache named sampleCache3. This cache overflows to disk. The disk store is
    persistent between cache and VM restarts. The disk expiry thread interval is set to 10
    minutes, overriding the default of 2 minutes.
   
    <cache name="sampleCache3"
           maxElementsInMemory="500"
           eternal="false"
           overflowToDisk="true"
           timeToIdleSeconds="300"
           timeToLiveSeconds="600"
           diskPersistent="true"
           diskExpiryThreadIntervalSeconds="1"
           memoryStoreEvictionPolicy="LFU"
            />
 -->

    <!--
    Sample distributed cache named sampleDistributedCache1.
    This cache replicates using defaults.
    It also bootstraps from the cluster, using default properties.
    
    <cache name="sampleDistributedCache1"
           maxElementsInMemory="10"
           eternal="false"
           timeToIdleSeconds="100"
           timeToLiveSeconds="100"
           overflowToDisk="false">
        <cacheEventListenerFactory
                class="net.sf.ehcache.distribution.RMICacheReplicatorFactory"/>
        <bootstrapCacheLoaderFactory
                class="net.sf.ehcache.distribution.RMIBootstrapCacheLoaderFactory"/>
    </cache>
-->

    <!--
    Sample distributed cache named sampleDistributedCache2.
    This cache replicates using specific properties.
    It only replicates updates and does so synchronously via copy
   
    <cache name="sampleDistributedCache2"
           maxElementsInMemory="10"
           eternal="false"
           timeToIdleSeconds="100"
           timeToLiveSeconds="100"
           overflowToDisk="false">
        <cacheEventListenerFactory
                class="net.sf.ehcache.distribution.RMICacheReplicatorFactory"
                properties="replicateAsynchronously=false, replicatePuts=false,
                            replicateUpdates=true, replicateUpdatesViaCopy=true,
                            replicateRemovals=false"/>
    </cache>
 -->
    <!--
    Sample distributed cache named sampleDistributedCache3.
    This cache replicates using defaults except that the asynchronous replication
    interval is set to 200ms.
   
    <cache name="sampleDistributedCache3"
           maxElementsInMemory="10"
           eternal="false"
           timeToIdleSeconds="100"
           timeToLiveSeconds="100"
           overflowToDisk="false">
        <cacheEventListenerFactory
                class="net.sf.ehcache.distribution.RMICacheReplicatorFactory"
                properties="asynchronousReplicationIntervalMillis=200"/>
    </cache>
 -->
 
</ehcache>