CacheManager类的基本介绍使用

1 、 CacheManager 对象的创建方式  

(1)Create a singleton CacheManager using defaults, then list caches.

CacheManager.create();

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

(2)Create a CacheManager instance using defaults, then list caches.

                CacheManager manager = new CacheManager();

               String[] cacheNames = manager.getCacheNames();

(3)Create two CacheManagers, each with a different configuration, and list the caches in each.

               CacheManager manager1 = new CacheManager("src/config/ehcache1.xml");

               CacheManager manager2 = new CacheManager("src/config/ehcache2.xml");

               String[] cacheNamesForManager1 = manager1.getCacheNames();

               String[] cacheNamesForManager2 = manager2.getCacheNames();

 

2 、 Cache 配置文件的加载方式

       CacheManager 的构造函数如下：

       

    (1) 无参

CacheManager manager = new CacheManager();

(2) 通过配置文件

CacheManager manager = new CacheManager("src/config/ehcache.xml");

    (3) 通过资源

URL url = getClass().getResource("/anotherconfigurationname.xml");

CacheManager manager = new CacheManager(url);

(4) 通过输入流

InputStream fis = new FileInputStream(new File("src/config/ehcache.xml").getAbsolutePath());

try {

             CacheManager manager = new CacheManager(fis);

} finally {

           fis.close();

}

 

3 、增加或删除 Cache

        增加 Cache 有两种方式：

       (1) 使用 CacheManager 的 addCache(String)

CacheManager singletonManager = CacheManager.create();

singletonManager.addCache("testCache");

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

       (2) 新增一个 Cache ，然后加到 CacheManager 中， Cache 在加入 CacheManager 之前是不能使用的

           CacheManager singletonManager = CacheManager.create();

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

manager.addCache(memoryOnlyCache);

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

       从 CachaManager 中删除 Cache

           CacheManager singletonManager = CacheManager.create();

singletonManager.removeCache("sampleCache1");

 

4 、关闭 CacheManager

    CacheManager 在使用之后应该关闭，虽然有自己的 shutdown hook ，建议在程序中手动关闭。

        CacheManager.getInstance().shutdown();

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 "java.io.tmpdir" />

   maxElementsInMemory="500"
   eternal="false"
   timeToIdleSeconds="300"
   timeToLiveSeconds="1200"
   overflowToDisk="true" />
     "com.Menu" maxElementsInMemory="150" eternal="false" timeToLiveSeconds="36000" timeToIdleSeconds="3600" overflowToDisk="true"/>

EhcacheUtil工具类使用： 

 public class EhcacheUtil {

     private static final String path = "/ehcache.xml";

     private URL url;

     private CacheManager manager;

     private static EhcacheUtil ehCache;

     private EhcacheUtil(String path) {
         url = getClass().getResource(path);
         manager = CacheManager.create(url);
     }

     public static EhcacheUtil getInstance() {
         if (ehCache== null) {
             ehCache= new EhcacheUtil(path);
         }
         return ehCache;
     }

     public void put(String cacheName, String key, Object value) {
         Cache cache = manager.getCache(cacheName);
         Element element = new Element(key, value);
         cache.put(element);
     }

     public Object get(String cacheName, String key) {
         Cache cache = manager.getCache(cacheName);
         Element element = cache.get(key);
         return element == null ? null : element.getObjectValue();
     }

     public Cache get(String cacheName) {
         return manager.getCache(cacheName);
     }

     public void remove(String cacheName, String key) {
         Cache cache = manager.getCache(cacheName);
         cache.remove(key);
     }

 }