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java.util.concurrent.Executors Maven / Gradle / Ivy
package java.util.concurrent;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.util.Collection;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
public class Executors {
private Executors() {
}
public static ExecutorService newFixedThreadPool(int nThreads) {
return new ThreadPoolExecutor(nThreads, nThreads, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue());
}
public static ExecutorService newFixedThreadPool(int nThreads, ThreadFactory threadFactory) {
return new ThreadPoolExecutor(nThreads, nThreads, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue(), threadFactory);
}
public static ExecutorService newSingleThreadExecutor() {
return new FinalizableDelegatedExecutorService(new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue()));
}
public static ExecutorService newSingleThreadExecutor(ThreadFactory threadFactory) {
return new FinalizableDelegatedExecutorService(new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue(), threadFactory));
}
public static ExecutorService newCachedThreadPool() {
return new ThreadPoolExecutor(0, Integer.MAX_VALUE, 60L, TimeUnit.SECONDS, new SynchronousQueue());
}
public static ExecutorService newCachedThreadPool(ThreadFactory threadFactory) {
return new ThreadPoolExecutor(0, Integer.MAX_VALUE, 60L, TimeUnit.SECONDS, new SynchronousQueue(), threadFactory);
}
public static ScheduledExecutorService newSingleThreadScheduledExecutor() {
return new DelegatedScheduledExecutorService(new ScheduledThreadPoolExecutor(1));
}
public static ScheduledExecutorService newSingleThreadScheduledExecutor(ThreadFactory threadFactory) {
return new DelegatedScheduledExecutorService(new ScheduledThreadPoolExecutor(1, threadFactory));
}
public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize) {
return new ScheduledThreadPoolExecutor(corePoolSize);
}
public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize, ThreadFactory threadFactory) {
return new ScheduledThreadPoolExecutor(corePoolSize, threadFactory);
}
public static ExecutorService unconfigurableExecutorService(ExecutorService executor) {
Objects.requireNonNull(executor);
return new DelegatedExecutorService(executor);
}
public static ScheduledExecutorService unconfigurableScheduledExecutorService(ScheduledExecutorService executor) {
Objects.requireNonNull(executor);
return new DelegatedScheduledExecutorService(executor);
}
public static ThreadFactory defaultThreadFactory() {
return new DefaultThreadFactory();
}
public static ThreadFactory privilegedThreadFactory() {
return new DefaultThreadFactory();
}
public static Callable callable(Runnable task, T result) {
Objects.requireNonNull(task);
return new RunnableAdapter(task, result);
}
public static Callable callable(Runnable task) {
Objects.requireNonNull(task);
return new RunnableAdapter(task, null);
}
public static Callable callable(final PrivilegedAction action) {
Objects.requireNonNull(action);
return new Callable() {
public Object call() {
return action.run();
}
};
}
public static Callable callable(final PrivilegedExceptionAction action) {
Objects.requireNonNull(action);
return new Callable() {
public Object call() throws Exception {
return action.run();
}
};
}
public static Callable privilegedCallable(Callable callable) {
Objects.requireNonNull(callable);
return callable;
}
public static Callable privilegedCallableUsingCurrentClassLoader(Callable callable) {
Objects.requireNonNull(callable);
return callable;
}
static final class RunnableAdapter implements Callable {
final Runnable task;
final T result;
RunnableAdapter(Runnable task, T result) {
this.task = task;
this.result = result;
}
public T call() {
task.run();
return result;
}
}
static class DefaultThreadFactory implements ThreadFactory {
private static final AtomicInteger poolNumber = new AtomicInteger(1);
private final ThreadGroup group;
private final AtomicInteger threadNumber = new AtomicInteger(1);
private final String namePrefix;
DefaultThreadFactory() {
SecurityManager s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
namePrefix = "pool-" + poolNumber.getAndIncrement() + "-thread-";
}
public Thread newThread(Runnable r) {
Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
if (t.isDaemon()) t.setDaemon(false);
if (t.getPriority() != Thread.NORM_PRIORITY) t.setPriority(Thread.NORM_PRIORITY);
return t;
}
}
static class DelegatedExecutorService extends AbstractExecutorService {
private final ExecutorService e;
DelegatedExecutorService(ExecutorService executor) {
e = executor;
}
public void execute(Runnable command) {
e.execute(command);
}
public void shutdown() {
e.shutdown();
}
public List shutdownNow() {
return e.shutdownNow();
}
public boolean isShutdown() {
return e.isShutdown();
}
public boolean isTerminated() {
return e.isTerminated();
}
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
return e.awaitTermination(timeout, unit);
}
public Future submit(Runnable task) {
return e.submit(task);
}
public Future submit(Callable task) {
return e.submit(task);
}
public Future submit(Runnable task, T result) {
return e.submit(task, result);
}
public List> invokeAll(Collection> tasks) throws InterruptedException {
return e.invokeAll(tasks);
}
public List> invokeAll(Collection> tasks, long timeout, TimeUnit unit)
throws InterruptedException {
return e.invokeAll(tasks, timeout, unit);
}
public T invokeAny(Collection> tasks)
throws InterruptedException, ExecutionException {
return e.invokeAny(tasks);
}
public T invokeAny(Collection> tasks, long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
return e.invokeAny(tasks, timeout, unit);
}
}
static class FinalizableDelegatedExecutorService extends DelegatedExecutorService {
FinalizableDelegatedExecutorService(ExecutorService executor) {
super(executor);
}
protected void finalize() {
super.shutdown();
}
}
static class DelegatedScheduledExecutorService extends DelegatedExecutorService implements ScheduledExecutorService {
private final ScheduledExecutorService e;
DelegatedScheduledExecutorService(ScheduledExecutorService executor) {
super(executor);
e = executor;
}
public ScheduledFuture schedule(Runnable command, long delay, TimeUnit unit) {
return e.schedule(command, delay, unit);
}
public ScheduledFuture schedule(Callable callable, long delay, TimeUnit unit) {
return e.schedule(callable, delay, unit);
}
public ScheduledFuture scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) {
return e.scheduleAtFixedRate(command, initialDelay, period, unit);
}
public ScheduledFuture scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
return e.scheduleWithFixedDelay(command, initialDelay, delay, unit);
}
}
}
