AsyncCacheWriter.java
- /*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you 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.apache.commons.jcs3.jcache.extras.writer;
- import javax.cache.Cache;
- import javax.cache.configuration.Factory;
- import javax.cache.integration.CacheWriter;
- import javax.cache.integration.CacheWriterException;
- import java.io.Closeable;
- import java.io.IOException;
- import java.util.Collection;
- import java.util.List;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- import java.util.concurrent.ThreadFactory;
- import java.util.concurrent.atomic.AtomicInteger;
- import java.util.logging.Level;
- import java.util.logging.Logger;
- public class AsyncCacheWriter<K, V> implements CacheWriter<K, V>, Closeable, Factory<CacheWriter<K, V>>
- {
- private static final Logger LOGGER = Logger.getLogger(AsyncCacheWriter.class.getName());
- private final CacheWriter<K, V> writer;
- private final ExecutorService pool;
- public AsyncCacheWriter(final CacheWriter<K, V> delegate, final int poolSize)
- {
- writer = delegate;
- pool = Executors.newFixedThreadPool(
- poolSize, new DaemonThreadFactory(delegate.getClass().getName() + "-" + delegate.hashCode() + "-"));
- }
- @Override
- public void write(final Cache.Entry<? extends K, ? extends V> entry) throws CacheWriterException
- {
- pool.submit(new ExceptionProtectionRunnable()
- {
- @Override
- public void doRun()
- {
- writer.write(entry);
- }
- });
- }
- @Override
- public void writeAll(final Collection<Cache.Entry<? extends K, ? extends V>> entries) throws CacheWriterException
- {
- pool.submit(new ExceptionProtectionRunnable()
- {
- @Override
- public void doRun()
- {
- writer.writeAll(entries);
- }
- });
- }
- @Override
- public void delete(final Object key) throws CacheWriterException
- {
- pool.submit(new ExceptionProtectionRunnable()
- {
- @Override
- public void doRun()
- {
- writer.delete(key);
- }
- });
- }
- @Override
- public void deleteAll(final Collection<?> keys) throws CacheWriterException
- {
- pool.submit(new ExceptionProtectionRunnable()
- {
- @Override
- public void doRun()
- {
- writer.deleteAll(keys);
- }
- });
- }
- @Override
- public void close() throws IOException
- {
- final List<Runnable> runnables = pool.shutdownNow();
- for (final Runnable r : runnables)
- {
- r.run();
- }
- }
- @Override
- public CacheWriter<K, V> create()
- {
- return this;
- }
- // avoid dep on impl
- private static class DaemonThreadFactory implements ThreadFactory
- {
- private final AtomicInteger index = new AtomicInteger(1);
- private final String prefix;
- public DaemonThreadFactory(final String prefix)
- {
- this.prefix = prefix;
- }
- @Override
- public Thread newThread( final Runnable runner )
- {
- final Thread t = new Thread( runner );
- t.setName(prefix + index.getAndIncrement());
- t.setDaemon(true);
- return t;
- }
- }
- private static abstract class ExceptionProtectionRunnable implements Runnable
- {
- @Override
- public void run()
- {
- try
- {
- doRun();
- }
- catch (final Exception e)
- {
- LOGGER.log(Level.SEVERE, e.getMessage(), e);
- }
- }
- protected abstract void doRun();
- }
- }