ehcache如何判断缓存数据是否存在--isKeyInCache

boolean isKeyInCache(java.lang.Object key)

An inexpensive check to see if the key exists in the cache.

 

Parameters:

key - the key to check for

Returns:

true if an Element matching the key is found in the cache. No assertions are made about the state of the Element.

getQuiet

Element getQuiet(java.lang.Object key)
throws java.lang.IllegalStateException,
CacheException

Gets an element from the cache, without updating Element statistics. Cache statistics are also not updated.

 

 

Parameters:

key - a serializable value

Returns:

the element, or null, if it does not exist.

Throws:

java.lang.IllegalStateException - if the cache is not Status.STATUS_ALIVE

CacheException

Since:

1.2

See Also:

isExpired(net.sf.ehcache.Element)

isExpired

boolean isExpired(Element element)
throws java.lang.IllegalStateException,
java.lang.NullPointerException

Checks whether this cache element has expired.

The element is expired if:

1. the idle time is non-zero and has elapsed, unless the cache is eternal; or
2. the time to live is non-zero and has elapsed, unless the cache is eternal; or
3. the value of the element is null.

 

Parameters:

element - the element to check

Returns:

true if it has expired

Throws:

java.lang.IllegalStateException - if the cache is not Status.STATUS_ALIVE

java.lang.NullPointerException - if the element is null

Element element=cache.getQuiet(key);
        log.info("element:"+element);
        if(element!=null){
            log.info("cache.isExpired(element):"+cache.isExpired(element));
            log.info("cacheName:" + cacheName + " key:" + key + " isExist:true");
            return true;
        }
        else{
            log.info("cacheName:" + cacheName + " key:" + key + " isExist:false");
            return false;
        }