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A general programming library in Java/Android. It's easy to learn and simple to use with concise and powerful APIs.
/*
* Copyright (c) 2015, Haiyang Li.
*
* 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.landawn.abacus.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.FutureTask;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.function.BiPredicate;
import java.util.function.Predicate;
import com.landawn.abacus.annotation.Internal;
import com.landawn.abacus.logging.Logger;
import com.landawn.abacus.logging.LoggerFactory;
/**
*
* @author Haiyang Li
* @since 0.8
*/
public class AsyncExecutor {
private static final Logger logger = LoggerFactory.getLogger(AsyncExecutor.class);
private static final int DEFAULT_CORE_POOL_SIZE = Math.max(8, IOUtil.CPU_CORES);
private static final int DEFAULT_MAX_THREAD_POOL_SIZE = Math.max(16, IOUtil.CPU_CORES * 2);
private final int coreThreadPoolSize;
private final int maxThreadPoolSize;
private final long keepAliveTime;
private final TimeUnit unit;
private volatile Executor executor;
public AsyncExecutor() {
this(DEFAULT_CORE_POOL_SIZE, DEFAULT_MAX_THREAD_POOL_SIZE, 180L, TimeUnit.SECONDS);
}
public AsyncExecutor(int coreThreadPoolSize, int maxThreadPoolSize, long keepAliveTime, TimeUnit unit) {
N.checkArgNotNegative(coreThreadPoolSize, "coreThreadPoolSize");
N.checkArgNotNegative(maxThreadPoolSize, "maxThreadPoolSize");
N.checkArgNotNegative(keepAliveTime, "keepAliveTime");
N.checkArgNotNull(unit, "unit");
this.coreThreadPoolSize = coreThreadPoolSize;
this.maxThreadPoolSize = Math.max(coreThreadPoolSize, maxThreadPoolSize);
this.keepAliveTime = keepAliveTime;
this.unit = unit;
}
public AsyncExecutor(final Executor executor) {
this(getCorePoolSize(executor), getMaximumPoolSize(executor), getKeepAliveTime(executor), TimeUnit.MILLISECONDS);
this.executor = executor;
}
private static int getCorePoolSize(final Executor executor) {
return executor instanceof ThreadPoolExecutor ? ((ThreadPoolExecutor) executor).getCorePoolSize() : DEFAULT_CORE_POOL_SIZE;
}
private static int getMaximumPoolSize(final Executor executor) {
return executor instanceof ThreadPoolExecutor ? ((ThreadPoolExecutor) executor).getMaximumPoolSize() : DEFAULT_CORE_POOL_SIZE;
}
private static long getKeepAliveTime(final Executor executor) {
return executor instanceof ThreadPoolExecutor ? ((ThreadPoolExecutor) executor).getKeepAliveTime(TimeUnit.MILLISECONDS)
: TimeUnit.SECONDS.toMillis(180);
}
/**
*
* @param command
* @return
*/
public ContinuableFuture execute(final Throwables.Runnable command) {
return execute(new FutureTask<>(() -> {
command.run();
return null;
}));
}
/**
*
* @param command
* @param actionInFinal
* @return
*/
public ContinuableFuture execute(final Throwables.Runnable command, final java.lang.Runnable actionInFinal) {
return execute(new FutureTask<>(() -> {
try {
command.run();
return null;
} finally {
actionInFinal.run();
}
}));
}
/**
*
* @param commands
* @return
* @deprecated
*/
@Deprecated
@SafeVarargs
public final List> execute(final Throwables.Runnable... commands) {
if (N.isNullOrEmpty(commands)) {
return new ArrayList<>();
}
final List> results = new ArrayList<>(commands.length);
for (com.landawn.abacus.util.Throwables.Runnable command : commands) {
results.add(execute(command));
}
return results;
}
/**
*
* @param commands
* @return
*/
public List> execute(final List> commands) {
if (N.isNullOrEmpty(commands)) {
return new ArrayList<>();
}
final List> results = new ArrayList<>(commands.size());
for (Throwables.Runnable cmd : commands) {
results.add(execute(cmd));
}
return results;
}
/**
*
* @param
* @param command
* @return
*/
public ContinuableFuture execute(final Callable command) {
return execute(new FutureTask<>(command));
}
/**
*
* @param
* @param command
* @param actioInFinal
* @return
*/
public ContinuableFuture execute(final Callable command, final java.lang.Runnable actioInFinal) {
return execute(new FutureTask<>(() -> {
try {
return command.call();
} finally {
actioInFinal.run();
}
}));
}
/**
*
* @param
* @param commands
* @return
* @deprecated
*/
@Deprecated
@SafeVarargs
public final List> execute(final Callable... commands) {
if (N.isNullOrEmpty(commands)) {
return new ArrayList<>();
}
final List> results = new ArrayList<>(commands.length);
for (Callable command : commands) {
results.add(execute(command));
}
return results;
}
/**
*
* @param
* @param commands
* @return
*/
public List> execute(final Collection> commands) {
if (N.isNullOrEmpty(commands)) {
return new ArrayList<>();
}
final List> results = new ArrayList<>(commands.size());
for (Callable cmd : commands) {
results.add(execute(cmd));
}
return results;
}
/**
*
* @param action
* @param retryTimes
* @param retryInterval
* @param retryCondition
* @return
*/
public ContinuableFuture execute(final Throwables.Runnable action, final int retryTimes, final long retryInterval,
final Predicate retryCondition) {
return execute((Callable) () -> {
Retry.of(retryTimes, retryInterval, retryCondition).run(action);
return null;
});
}
/**
*
* @param
* @param action
* @param retryTimes
* @param retryInterval
* @param retryCondition
* @return
*/
public ContinuableFuture execute(final Callable action, final int retryTimes, final long retryInterval,
final BiPredicate retryCondition) {
return execute((Callable) () -> {
final Retry retry = Retry.of(retryTimes, retryInterval, retryCondition);
return retry.call(action);
});
}
/**
*
* @param
* @param futureTask
* @return
*/
protected ContinuableFuture execute(final FutureTask futureTask) {
final Executor executor = getExecutor();
executor.execute(futureTask);
return new ContinuableFuture<>(futureTask, null, executor);
}
/**
* Gets the executor.
*
* @return
*/
@Internal
public Executor getExecutor() {
if (executor == null) {
synchronized (this) {
if (executor == null) {
final ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(coreThreadPoolSize, maxThreadPoolSize, keepAliveTime, unit,
new LinkedBlockingQueue<>());
// if (keepAliveTime > 0 && coreThreadPoolSize == maxThreadPoolSize) {
// threadPoolExecutor.allowCoreThreadTimeOut(true);
// }
executor = threadPoolExecutor;
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
shutdown(120, TimeUnit.SECONDS);
}
});
}
}
}
return executor;
}
public synchronized void shutdown() {
shutdown(0, TimeUnit.SECONDS);
}
public synchronized void shutdown(final long terminationTimeout, final TimeUnit timeUnit) {
if (executor == null || !(executor instanceof ExecutorService executorService)) {
return;
}
logger.warn("Starting to shutdown task in AsyncExecutor");
try {
executorService.shutdown();
if (terminationTimeout > 0) {
if (!executorService.isTerminated()) {
executorService.awaitTermination(terminationTimeout, timeUnit);
}
}
} catch (InterruptedException e) {
logger.warn("Not all the requests/tasks executed in AsyncExecutor are completed successfully before shutdown.");
} finally {
executor = null;
logger.warn("Completed to shutdown task in AsyncExecutor");
}
}
@Override
public String toString() {
final String activeCount = executor instanceof ThreadPoolExecutor ? "" + ((ThreadPoolExecutor) executor).getActiveCount() : "?";
return "{coreThreadPoolSize: " + coreThreadPoolSize + ", maxThreadPoolSize: " + maxThreadPoolSize + ", activeCount: " + activeCount
+ ", keepAliveTime: " + unit.toMillis(keepAliveTime) + "ms, Executor: " + N.toString(executor) + "}";
}
}