纯Java的进程内缓存框架-EhCache

Java缓存框架 EhCache EhCache 是一个纯Java的进程内缓存框架，具有快速、精干等特点，是Hibernate中默认的CacheProvider。

JAVA实例：

[java]
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package test.ehcache;

import net.sf.ehcache.Cache;

import net.sf.ehcache.CacheManager;

import net.sf.ehcache.Element;

public class TestCache {

public static
void main(String[] args) {

/**
* Create a singleton CacheManager using defaults, then list caches.

*/
CacheManager.create();
String[] cacheNames = CacheManager.getInstance().getCacheNames();

System.out.println(cacheNames.length);

/**
* Create one CacheManager with a configuration, and list the caches in each.

*/
CacheManager manager2 = CacheManager.newInstance("ehcache1.xml");

String[] cacheNames2 = manager2.getCacheNames();
System.out.println(cacheNames2.length);

/**
* Create a Cache and add it to the CacheManager, then use it.

* Note that Caches are not usable until they have been added to a CacheManager.

*/
CacheManager singletonManager = CacheManager.create();

Cache memoryOnlyCache = new Cache("testCache",
5000, false,
false, 5,
2);
singletonManager.addCache(memoryOnlyCache);

Cache cache = singletonManager.getCache("testCache");

Element element = new Element("key1","value1");

cache.put(element);
Element value = cache.get("key1");

System.out.println(value.getObjectValue());
//value1

System.out.println(value.toString());
//[ key = key1, value=value1, version=1, hitCount=1, CreationTime = 1359130974484, LastAccessTime = 1359130974500 ]

}

}

package test.ehcache;

import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;

public class TestCache {

public static void main(String[] args) {

/**
* Create a singleton CacheManager using defaults, then list caches.
*/
CacheManager.create();
String[] cacheNames = CacheManager.getInstance().getCacheNames();
System.out.println(cacheNames.length);

/**
* Create one CacheManager with a configuration, and list the caches in each.
*/
CacheManager manager2 = CacheManager.newInstance("ehcache1.xml");
String[] cacheNames2 = manager2.getCacheNames();
System.out.println(cacheNames2.length);

/**
* Create a Cache and add it to the CacheManager, then use it.
* Note that Caches are not usable until they have been added to a CacheManager.
*/
CacheManager singletonManager = CacheManager.create();
Cache memoryOnlyCache = new Cache("testCache", 5000, false, false, 5, 2);
singletonManager.addCache(memoryOnlyCache);
Cache cache = singletonManager.getCache("testCache");

Element element = new Element("key1","value1");
cache.put(element);
Element value = cache.get("key1");

System.out.println(value.getObjectValue());
//value1
System.out.println(value.toString());
//[ key = key1, value=value1, version=1, hitCount=1, CreationTime = 1359130974484, LastAccessTime = 1359130974500 ]

}

}

配置文件ehcache1.xml：

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<?xml
version="1.0"
encoding="UTF-8"?>

<ehcache
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:noNamespaceSchemaLocation="ehcache.xsd"
updateCheck="true"

monitoring="autodetect"
dynamicConfig="true">

<diskStore
path="user.dir"
/>

<defaultCache

name="default-cache"

maxElementsInMemory="10000"

maxElementsOnDisk="0"

eternal="false"

overflowToDisk="true"

timeToIdleSeconds="1200"

timeToLiveSeconds="1200">

</defaultCache>

<cache

name="my-cache"

maxElementsInMemory="10000"

maxElementsOnDisk="0"

eternal="false"

overflowToDisk="true"

diskSpoolBufferSizeMB="20"

timeToIdleSeconds="300"

timeToLiveSeconds="600"

memoryStoreEvictionPolicy="FIFO">

</cache>

</ehcache>

<!--
Default Cache configuration. These will applied to caches programmatically created through the CacheManager.

The following attributes are required for defaultCache:

maxInMemory - Sets the maximum number of objects that will be created in memory

eternal - Sets whether elements are eternal. If eternal, timeouts are ignored and the element

is never expired.

timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used

if the element is not eternal. Idle time is now - last accessed time

timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used

if the element is not eternal. TTL is now - creation time

overflowToDisk - Sets whether elements can overflow to disk when the in-memory cache

has reached the maxInMemory limit.

-->