我通过infinispan cache .addListener()方法添加了一个CacheEntryExpired侦听器实现。
在条目到期时触发侦听器事件。 问题是,每次事件被触发两次。
我验证了(使用debugger和cache.getListeners())缓存不包含我的同一个Listener的两个实例。 getListeners的结果是:
(java.util.Collections$UnmodifiableSet<E>) [org.infinispan.iteration.impl.LocalEntryRetriever$PartitionListener@666SAT, my.supercool.package.MyExpirationEventListenerImpl@666TAN]
所以只有一个听众。监听器实现接口:
@Listener
public interface TokenExpirationEventListener<T> {
@CacheEntryExpired
public void entryExpired(CacheEntryExpiredEvent<String, T> event);
}
实现如下:
@Override
@CacheEntryExpired
public void entryExpired(CacheEntryExpiredEvent<String, T> event) {
CODE
}
但是从界面中删除@CacheEntryExpired和@Listener注释(只是尝试)并没有导致事件只发生一次。
我有什么问题,我在每个条目到期事件中都会收到两个事件吗?
infinispan版本是8.2.0.final。
EDIT2: 我能够找到导致问题的所有配置。允许重现错误的代码是:
import java.util.concurrent.TimeUnit;
import org.infinispan.Cache;
import org.infinispan.configuration.cache.CacheMode;
import org.infinispan.configuration.cache.ClusteringConfigurationBuilder;
import org.infinispan.configuration.cache.Configuration;
import org.infinispan.configuration.cache.ConfigurationBuilder;
import org.infinispan.configuration.global.GlobalConfigurationBuilder;
import org.infinispan.configuration.global.TransportConfigurationBuilder;
import org.infinispan.manager.DefaultCacheManager;
import org.infinispan.notifications.Listener;
import org.infinispan.notifications.cachelistener.annotation.CacheEntryExpired;
import org.infinispan.notifications.cachelistener.event.CacheEntryExpiredEvent;
@Listener
public class TestMain {
private Cache<String, String> cache;
public static void main(String[] args) throws Exception {
new TestMain().test();
}
private void test() throws Exception{
configureInfinispan();
cache.put("test", "test", 10, TimeUnit.SECONDS);
cache.put("test2", "test", 10, TimeUnit.SECONDS);
while(true){
Thread.sleep(100);
}
}
public void configureInfinispan(){
DefaultCacheManager defaultCacheManager = configureCachaManager();//globalConfigurationBuilder.build(), defaultConfigurationBuilder.build(), /*startNow*/ true)
Configuration conf = defaultCacheManager.getDefaultCacheConfiguration();
ConfigurationBuilder cacheConfigBuilder = new ConfigurationBuilder().read(conf);
cacheConfigBuilder.expiration().enableReaper().wakeUpInterval(5, TimeUnit.SECONDS); //to speed test results
duplicationReason2(cacheConfigBuilder);
defaultCacheManager.defineConfiguration("testCache", cacheConfigBuilder.build());
cache = defaultCacheManager.getCache("testCache");
cache.addListener(new TestMain());
System.out.println("conf");
}
public DefaultCacheManager configureCachaManager(){
GlobalConfigurationBuilder globalConfigurationBuilder = new GlobalConfigurationBuilder();
ConfigurationBuilder defaultConfigurationBuilder = new ConfigurationBuilder();
duplicationReason1(defaultConfigurationBuilder, globalConfigurationBuilder);
return new DefaultCacheManager(globalConfigurationBuilder.build(), defaultConfigurationBuilder.build(), true);
}
@CacheEntryExpired
public void entryExpired(CacheEntryExpiredEvent<String, String> event) {
System.out.println("Expired:" + event.getKey());
}
private void duplicationReason2(ConfigurationBuilder configurationBuilder) {
configurationBuilder.persistence() //enable persistence
.passivation(false)
.addSingleFileStore()
.location("C:/test/infinispan")
// Disable writing anything to the file except when we do shutdown
.maxEntries(0)
.shared(false)
.fetchPersistentState(true)
.async() //write-behind
.enable() //write-behind
.threadPoolSize(Runtime.getRuntime().availableProcessors()) //writing threads
.preload(true); //load data from file on startup
}
private void duplicationReason1(ConfigurationBuilder configurationBuilder, GlobalConfigurationBuilder globalConfigurationBuilder){
configureCacheOperationalMode(configurationBuilder);
configureTransport(globalConfigurationBuilder);
}
private void configureCacheOperationalMode(ConfigurationBuilder configurationBuilder) {
ClusteringConfigurationBuilder clusteringConfigurationBuilder = configurationBuilder.clustering();
clusteringConfigurationBuilder.cacheMode(CacheMode.REPL_ASYNC);
}
private void configureTransport(GlobalConfigurationBuilder globalConfigurationBuilder) {
TransportConfigurationBuilder transportConfigurationBuilder = globalConfigurationBuilder.transport().defaultTransport();
transportConfigurationBuilder.addProperty("configurationFile", "default-configs/default-jgroups-udp.xml");
}
}
运行此将(不幸的是,您之后需要自己杀死主线程)导致事件被打印两次。
有两种方法可以共同导致这种情况。评论其中一个并留下第二个导致事件发生一次。
这些方法名为duplicationReason1和duplicationReason2。
也许在配置中我有些不明白的地方?
答案 0 :(得分:2)
好的,我能够看到你添加的测试用例发生了什么,谢谢!
这是群集缓存atm中的一个错误。我记录了[1]来查看它,如果你想要更新,你应该关注。
虽然我们可以修复重复的问题,但您仍然可能会出现其他可能的重复项,因此您仍然可以处理它们。生成副本的示例可以在“并发过期访问”下的[2]处找到。因此,您通常应该忽略具有空值的到期事件。
[1] https://issues.jboss.org/browse/ISPN-6405 [2] http://blog.infinispan.org/2015/10/expiration-enhancements.html