[Google Guava]-缓存详解

标签：guava cache   cacheloader   

例如，你可以用下面的代码构建LoadingCache：

 @Test
    public void LoadingCache() throws Exception{
        LoadingCache<String,String> cahceBuilder=CacheBuilder
        .newBuilder().maximumSize(10000).expireAfterAccess(10, TimeUnit.MINUTES)
        .build(new CacheLoader<String, String>(){
            @Override
            public String load(String key) throws Exception {        
                return createExpensiveGraph(key);
            }

	   private String createExpensiveGraph(String key) {
		System.out.println("load into cache!");
		return "hello "+key+"!";
	    }
            
        });        
        
        cahceBuilder.get("2");
        cahceBuilder.get("3");
        //第二次就直接从缓存中取出
        cahceBuilder.get("2");
    }

 @Test
    public void callableCache()throws Exception{
        Cache<String, String> cache = CacheBuilder.newBuilder().maximumSize(1000).expireAfterAccess(10, TimeUnit.MINUTES).build();
        //这里可以手動进行缓存
	cache.put("1", "I'm in chche");
        //-----------------------------------------------
        final String key1 = "1";
        String resultVal = cache.get(key1, new Callable<String>() {  
            public String call() {  
                return createExpensiveGraph(key1);
            }  
        });
       
        System.out.println("1 value : " + resultVal);
        //-------------------------------------------------
        resultVal = cache.get("2", new Callable<String>() {  
            public String call() {  
                return createExpensiveGraph(key1);
            }  
        });  
        System.out.println("2 value : " + resultVal);  
        //==================================================
    }
	
	protected String createExpensiveGraph(String string) {
		return "hello "+string+"!";
	}

[Google Guava]-缓存详解

标签：guava cache   cacheloader   

原文地址：http://blog.csdn.net/u012516914/article/details/43483125