CacheManager的用法

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();