如何定期清除不经常使用的缓存区域？

Question

According to this Ehcache_Configuration_Guide.pdf

How Configuration Affects Element Flushing and Eviction
The following example shows a cache with certain expiration seings:
<cache name="myCache"
eternal="false" timeToIdleSeconds="3600"
timeToLiveSeconds="0" memoryStoreEvictionPolicy="LFU">
</cache>
Note the following about the myCache configuration:
If a client accesses an entry in myCache that has been idle for more than an hour timeToIdleSeconds), that element is evicted.
If an entry expires but is not accessed, and no resource constraints force eviction, then the expired entry remains in place until a periodic evictor removes it.

I didn't find any exemple of how to configure the eviction periodicly,

is it configurable? or it must be hard-coded for hibernate?

According to this page ExpiryTaskExtension.java There is no default schedular for time eviction in ehCache

Answer 1

import java.util.Timer;
import java.util.TimerTask;
import net.sf.ehcache.CacheManager;

public class EhCacheExpiryTask {
    class ExpiryTask extends TimerTask{
        @Override
        public void run() {
            for (CacheManager manager : CacheManager.ALL_CACHE_MANAGERS) {
                for (String name : manager.getCacheNames()) {
                    //manager.getCache(name).getCacheConfiguration().setStatistics(true);
                    manager.getCache(name).evictExpiredElements();                 
                } 
            }        
        }
    }
    private Timer timer;
    private long period;
    private ExpiryTask expiryTask;
    public EhCacheExpiryTask(long period){
        this.period = period;
        this.timer = new Timer();
    } 
    public void stop(){
        timer.cancel();
    }
    public void start(){
        expiryTask = new ExpiryTask();      
        timer.schedule(expiryTask, 10000, period);
    }
}