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/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.impl.client.cache;
import ch.boye.httpclientandroidlib.annotation.ThreadSafe;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Immediately schedules any incoming validation request. Relies on
* {@link CacheConfig} to configure the used {@link java.util.concurrent.ThreadPoolExecutor}.
*
* @since 4.3
*/
@ThreadSafe
public class ImmediateSchedulingStrategy implements SchedulingStrategy {
private final ExecutorService executor;
/**
* Uses a {@link java.util.concurrent.ThreadPoolExecutor} which is configured according to the
* given {@link CacheConfig}.
* @param cacheConfig specifies thread pool settings. See
* {@link CacheConfig#getAsynchronousWorkersMax()},
* {@link CacheConfig#getAsynchronousWorkersCore()},
* {@link CacheConfig#getAsynchronousWorkerIdleLifetimeSecs()},
* and {@link CacheConfig#getRevalidationQueueSize()}.
*/
public ImmediateSchedulingStrategy(final CacheConfig cacheConfig) {
this(new ThreadPoolExecutor(
cacheConfig.getAsynchronousWorkersCore(),
cacheConfig.getAsynchronousWorkersMax(),
cacheConfig.getAsynchronousWorkerIdleLifetimeSecs(),
TimeUnit.SECONDS,
new ArrayBlockingQueue<Runnable>(cacheConfig.getRevalidationQueueSize()))
);
}
ImmediateSchedulingStrategy(final ExecutorService executor) {
this.executor = executor;
}
public void schedule(final AsynchronousValidationRequest revalidationRequest) {
if (revalidationRequest == null) {
throw new IllegalArgumentException("AsynchronousValidationRequest may not be null");
}
executor.execute(revalidationRequest);
}
public void close() {
executor.shutdown();
}
/**
* Visible for testing.
*/
void awaitTermination(final long timeout, final TimeUnit unit) throws InterruptedException {
executor.awaitTermination(timeout, unit);
}
}
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