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The implementation module of Ehcache 3
/*
* Copyright Terracotta, Inc.
*
* 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 org.ehcache.impl.internal.loaderwriter.writebehind;
import java.util.concurrent.BlockingQueue;
import org.ehcache.impl.internal.concurrent.ConcurrentHashMap;
import org.ehcache.impl.internal.loaderwriter.writebehind.operations.SingleOperation;
import org.ehcache.spi.loaderwriter.CacheLoaderWriter;
import org.ehcache.spi.loaderwriter.WriteBehindConfiguration;
import org.ehcache.core.spi.service.ExecutionService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import static org.ehcache.impl.internal.executor.ExecutorUtil.shutdown;
/**
*
* @author cdennis
*/
public class NonBatchingLocalHeapWriteBehindQueue extends AbstractWriteBehind {
private static final Logger LOGGER = LoggerFactory.getLogger(NonBatchingLocalHeapWriteBehindQueue.class);
private final CacheLoaderWriter cacheLoaderWriter;
private final ConcurrentMap> latest = new ConcurrentHashMap<>();
private final BlockingQueue executorQueue;
private final ExecutorService executor;
public NonBatchingLocalHeapWriteBehindQueue(ExecutionService executionService, String defaultThreadPool, WriteBehindConfiguration config, CacheLoaderWriter cacheLoaderWriter) {
super(cacheLoaderWriter);
this.cacheLoaderWriter = cacheLoaderWriter;
this.executorQueue = new LinkedBlockingQueue<>(config.getMaxQueueSize());
if (config.getThreadPoolAlias() == null) {
this.executor = executionService.getOrderedExecutor(defaultThreadPool, executorQueue);
} else {
this.executor = executionService.getOrderedExecutor(config.getThreadPoolAlias(), executorQueue);
}
}
@Override
protected SingleOperation getOperation(K key) {
return latest.get(key);
}
@Override
protected void addOperation(final SingleOperation operation) {
latest.put(operation.getKey(), operation);
submit(() -> {
try {
operation.performOperation(cacheLoaderWriter);
} catch (Exception e) {
LOGGER.warn("Exception while processing key '{}' write behind queue : {}", operation.getKey(), e);
} finally {
latest.remove(operation.getKey(), operation);
}
});
}
@Override
public void start() {
//no-op
}
@Override
public void stop() {
shutdown(executor);
}
private void submit(Runnable operation) {
executor.submit(operation);
}
@Override
public long getQueueSize() {
return executorQueue.size();
}
}