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/*
* Copyright (c) 2008-2015, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.client.spi.impl;
import com.hazelcast.client.spi.ClientExecutionService;
import com.hazelcast.core.ExecutionCallback;
import com.hazelcast.core.ICompletableFuture;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;
import com.hazelcast.util.executor.CompletableFutureTask;
import com.hazelcast.util.executor.PoolExecutorThreadFactory;
import com.hazelcast.util.executor.SingleExecutorThreadFactory;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public final class ClientExecutionServiceImpl implements ClientExecutionService {
private static final ILogger LOGGER = Logger.getLogger(ClientExecutionService.class);
private static final long TERMINATE_TIMEOUT_SECONDS = 30;
private static final ExecutionCallback FAILURE_LOGGING_EXECUTION_CALLBACK = new ExecutionCallback() {
@Override
public void onResponse(Object response) {
}
@Override
public void onFailure(Throwable t) {
LOGGER.warning("Rejected internal execution on scheduledExecutor", t);
}
};
private final ExecutorService userExecutor;
private final ExecutorService internalExecutor;
private final ScheduledExecutorService scheduledExecutor;
public ClientExecutionServiceImpl(String name, ThreadGroup threadGroup, ClassLoader classLoader, int poolSize) {
int executorPoolSize = poolSize;
if (executorPoolSize <= 0) {
executorPoolSize = Runtime.getRuntime().availableProcessors();
}
internalExecutor = new ThreadPoolExecutor(2, 2, 0L, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue(),
new PoolExecutorThreadFactory(threadGroup, name + ".internal-", classLoader),
new RejectedExecutionHandler() {
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
String message = "Internal executor rejected task: " + r + ", because client is shutting down...";
LOGGER.finest(message);
throw new RejectedExecutionException(message);
}
});
userExecutor = new ThreadPoolExecutor(executorPoolSize, executorPoolSize, 0L, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue(),
new PoolExecutorThreadFactory(threadGroup, name + ".user-", classLoader),
new RejectedExecutionHandler() {
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
String message = "Internal executor rejected task: " + r + ", because client is shutting down...";
LOGGER.finest(message);
throw new RejectedExecutionException(message);
}
});
scheduledExecutor = Executors.newSingleThreadScheduledExecutor(
new SingleExecutorThreadFactory(threadGroup, classLoader, name + ".scheduled"));
}
public ICompletableFuture submitInternal(Runnable runnable) {
CompletableFutureTask futureTask = new CompletableFutureTask(runnable, null, internalExecutor);
internalExecutor.submit(futureTask);
return futureTask;
}
public void executeInternal(Runnable runnable) {
internalExecutor.execute(runnable);
}
@Override
public void execute(Runnable command) {
userExecutor.execute(command);
}
@Override
public ICompletableFuture submit(Runnable task) {
CompletableFutureTask futureTask = new CompletableFutureTask(task, null, getAsyncExecutor());
userExecutor.submit(futureTask);
return futureTask;
}
/**
* Utilized when given command needs to make a remote call. Response of remote call is not handled in runnable itself
* but rather in execution callback so that executor is not blocked because of a remote operation
*
* @param command
* @param delay
* @param unit
* @param executionCallback
* @return scheduledFuture
*/
public ScheduledFuture schedule(final Runnable command, long delay, TimeUnit unit,
final ExecutionCallback executionCallback) {
return scheduledExecutor.schedule(new Runnable() {
public void run() {
executeInternalSafely(command, executionCallback);
}
}, delay, unit);
}
@Override
public ICompletableFuture submit(Callable task) {
CompletableFutureTask futureTask = new CompletableFutureTask(task, getAsyncExecutor());
userExecutor.submit(futureTask);
return futureTask;
}
@Override
public ScheduledFuture schedule(final Runnable command, long delay, TimeUnit unit) {
return scheduledExecutor.schedule(new Runnable() {
public void run() {
executeInternalSafely(command, FAILURE_LOGGING_EXECUTION_CALLBACK);
}
}, delay, unit);
}
@Override
public ScheduledFuture scheduleAtFixedRate(final Runnable command, long initialDelay, long period, TimeUnit unit) {
return scheduledExecutor.scheduleAtFixedRate(new Runnable() {
public void run() {
executeInternalSafely(command, FAILURE_LOGGING_EXECUTION_CALLBACK);
}
}, initialDelay, period, unit);
}
@Override
public ScheduledFuture scheduleWithFixedDelay(final Runnable command, long initialDelay, long period, TimeUnit unit) {
return scheduledExecutor.scheduleWithFixedDelay(new Runnable() {
public void run() {
executeInternalSafely(command, FAILURE_LOGGING_EXECUTION_CALLBACK);
}
}, initialDelay, period, unit);
}
@Override
public ExecutorService getAsyncExecutor() {
return userExecutor;
}
public void shutdown() {
shutdownExecutor("scheduled", scheduledExecutor);
shutdownExecutor("user", userExecutor);
shutdownExecutor("internal", internalExecutor);
}
private void executeInternalSafely(Runnable command, ExecutionCallback executionCallback) {
try {
submitInternal(command).andThen(executionCallback);
} catch (RejectedExecutionException e) {
executionCallback.onFailure(e);
}
}
private void shutdownExecutor(String name, ExecutorService executor) {
executor.shutdown();
try {
boolean success = executor.awaitTermination(TERMINATE_TIMEOUT_SECONDS, TimeUnit.SECONDS);
if (!success) {
LOGGER.warning(name + " executor awaitTermination could not completed in "
+ TERMINATE_TIMEOUT_SECONDS + " seconds");
}
} catch (InterruptedException e) {
LOGGER.warning(name + " executor await termination is interrupted", e);
}
}
}
