| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.googlesource.gerrit.plugins.multisite.cache; |
| |
| import com.google.common.cache.RemovalNotification; |
| import com.google.gerrit.extensions.registration.DynamicSet; |
| import com.google.gerrit.server.cache.CacheRemovalListener; |
| import com.google.inject.Inject; |
| import com.googlesource.gerrit.plugins.multisite.forwarder.CacheEvictionForwarder; |
| import com.googlesource.gerrit.plugins.multisite.forwarder.Context; |
| import com.googlesource.gerrit.plugins.multisite.forwarder.ForwarderTask; |
| import com.googlesource.gerrit.plugins.multisite.forwarder.events.CacheEvictionEvent; |
| import java.util.concurrent.Executor; |
| |
| class CacheEvictionHandler<K, V> implements CacheRemovalListener<K, V> { |
| private final Executor executor; |
| private final DynamicSet<CacheEvictionForwarder> forwarders; |
| private final CachePatternMatcher matcher; |
| |
| @Inject |
| CacheEvictionHandler( |
| DynamicSet<CacheEvictionForwarder> forwarders, |
| @CacheExecutor Executor executor, |
| CachePatternMatcher matcher) { |
| this.forwarders = forwarders; |
| this.executor = executor; |
| this.matcher = matcher; |
| } |
| |
| @Override |
| public void onRemoval(String plugin, String cache, RemovalNotification<K, V> notification) { |
| if (!Context.isForwardedEvent() && !notification.wasEvicted() && matcher.matches(cache)) { |
| executor.execute(new CacheEvictionTask(new CacheEvictionEvent(cache, notification.getKey()))); |
| } |
| } |
| |
| class CacheEvictionTask extends ForwarderTask { |
| CacheEvictionEvent cacheEvictionEvent; |
| |
| CacheEvictionTask(CacheEvictionEvent cacheEvictionEvent) { |
| this.cacheEvictionEvent = cacheEvictionEvent; |
| } |
| |
| @Override |
| public void run() { |
| forwarders.forEach(f -> f.evict(this, cacheEvictionEvent)); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format( |
| "Evict key '%s' from cache '%s' in target instance", |
| cacheEvictionEvent.key, cacheEvictionEvent.cacheName); |
| } |
| } |
| } |