Ehcache磁盘存储不干净关机

Question

我正在使用具有磁盘存储持久性的缓存.在应用程序的后续重新运行中,我收到以下错误:

net.sf.ehcache.store.DiskStore deleteIndexIfCorrupt
WARNING: The index for data file MyCache.data is out of date,
probably due to an unclean shutdown. Deleting index file MYCache.index

有没有办法解决这个问题,除了明确调用net.sf.ehcache.CacheManager.shutdown()应用程序中的某个地方？

缓存配置:

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="ehcache.xsd"
             updateCheck="true" monitoring="autodetect">

    <diskStore path="C:\work"/>

    <cacheManagerEventListenerFactory class="" properties=""/>

    <cacheManagerPeerProviderFactory
            class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory"
            properties="peerDiscovery=automatic,
                        multicastGroupAddress=230.0.0.1,
                        multicastGroupPort=4446, timeToLive=1"
            propertySeparator=","
            />

    <cacheManagerPeerListenerFactory
            class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory"/>

    <defaultCache
            maxElementsInMemory="1"
            eternal="false"
            timeToIdleSeconds="0"
            timeToLiveSeconds="86400"
            overflowToDisk="true"
            diskSpoolBufferSizeMB="1"
            maxElementsOnDisk="10000"
            diskPersistent="true"
            diskExpiryThreadIntervalSeconds="120"
            memoryStoreEvictionPolicy="LFU"
            />

</ehcache>

用于复制问题的代码:

import java.util.ArrayList;
import java.util.List;

import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;

public class CacheTest {
    static CacheManager manager = new CacheManager(CacheTest.class
            .getResource("ehcache.xml"));
    static Cache cache;

    public static void main(String[] args) {

        // Get a default instance
        manager.addCache("test");
        cache = manager.getCache("test");

        // Generate some junk so that the
        // cache properly flushes to disk
        // as cache.flush() is not working
        List<String> t = new ArrayList<String>();
        for (int i = 0; i < 1000; i++)
            t.add(null);
        // Oddly enough fewer elements
        // do not persist to disk or give
        // an error
        for (int i = 0; i < 100000; i++) {
            cache.put(new Element(i, t));
        }
        cache.flush();

        if (cache.get("key1") == null) {
            System.out.println("key1 not found in cache!");
            cache.put(new Element("key1", "value1"));
        }

        System.out.println(cache.get("key1"));
    }
}

Answer 1

尝试设置系统属性: net.sf.ehcache.enableShutdownHook = true

因此,您可以在程序的开头添加以下行: System.setProperty("net.sf.ehcache.enableShutdownHook","true");

或者,从命令行传递属性: java -Dnet.sf.ehcache.enableShutdownHook=true ...

注意,ehcache网站在使用此关闭钩子时确实提到了一些注意事项: 关闭Ehcache

何时运行关闭钩子,何时不运行

关闭钩子运行时:

• 程序通常存在.例如,调用System.exit(),或者退出最后一个非守护进程线程
• 虚拟机已终止.例如CTRL-C.这对应于Unix系统上的kill -SIGTERM pid或kill -15 pid.

在以下情况下,关闭钩子不会运行:

• 虚拟机中止
• SIGKILL信号被发送到Unix系统上的虚拟机进程.例如杀死-SIGKILL pid或kill -9 pid
• TerminateProcess调用将发送到Windows系统上的进程.

希望它有效:)