207 lines
5.9 KiB
Java
207 lines
5.9 KiB
Java
package org.warp.commonutils.concurrency.executor;
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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import java.time.Duration;
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import java.util.Collection;
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import java.util.List;
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import java.util.Objects;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Future;
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import java.util.concurrent.RejectedExecutionException;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import javax.annotation.Nonnull;
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import org.jetbrains.annotations.NotNull;
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public class BlockingOnFullQueueExecutorServiceDecorator implements BoundedExecutorService {
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private static final class PermitReleasingRunnableDecorator implements Runnable {
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@Nonnull
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private final Runnable delegate;
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@Nonnull
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private final Semaphore semaphore;
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private PermitReleasingRunnableDecorator(@Nonnull final Runnable task, @Nonnull final Semaphore semaphoreToRelease) {
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this.delegate = task;
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this.semaphore = semaphoreToRelease;
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}
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@Override
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public void run() {
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try {
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this.delegate.run();
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}
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finally {
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// however execution goes, release permit for next task
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this.semaphore.release();
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}
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}
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@Override
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public final String toString() {
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return String.format("%s[delegate='%s']", getClass().getSimpleName(), this.delegate);
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}
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}
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private static final class PermitReleasingCallableDecorator<T> implements Callable<T> {
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@Nonnull
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private final Callable<T> delegate;
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@Nonnull
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private final Semaphore semaphore;
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private PermitReleasingCallableDecorator(@Nonnull final Callable<T> task, @Nonnull final Semaphore semaphoreToRelease) {
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this.delegate = task;
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this.semaphore = semaphoreToRelease;
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}
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@Override
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public T call() throws Exception {
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try {
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return this.delegate.call();
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} finally {
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// however execution goes, release permit for next task
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this.semaphore.release();
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}
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}
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@Override
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public final String toString() {
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return String.format("%s[delegate='%s']", getClass().getSimpleName(), this.delegate);
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}
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}
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@Nonnull
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private final Semaphore taskLimit;
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@Nonnull
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private final Duration timeout;
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@Nonnull
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private final ExecutorService delegate;
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public BlockingOnFullQueueExecutorServiceDecorator(@Nonnull final ExecutorService executor, final int maximumTaskNumber, @Nonnull final Duration maximumTimeout) {
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this.delegate = Objects.requireNonNull(executor, "'executor' must not be null");
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if (maximumTaskNumber < 1) {
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throw new IllegalArgumentException(String.format("At least one task must be permitted, not '%d'", maximumTaskNumber));
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}
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this.timeout = Objects.requireNonNull(maximumTimeout, "'maximumTimeout' must not be null");
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if (this.timeout.isNegative()) {
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throw new IllegalArgumentException("'maximumTimeout' must not be negative");
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}
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this.taskLimit = new Semaphore(maximumTaskNumber);
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}
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private void preExecute(Object command) {
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Objects.requireNonNull(command, "'command' must not be null");
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try {
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// attempt to acquire permit for task execution
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if (!this.taskLimit.tryAcquire(this.timeout.toMillis(), MILLISECONDS)) {
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throw new RejectedExecutionException(String.format("Executor '%s' busy", this.delegate));
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}
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}
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catch (final InterruptedException e) {
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// restore interrupt status
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Thread.currentThread().interrupt();
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throw new IllegalStateException(e);
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}
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}
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@Override
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public final void execute(final Runnable command) {
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preExecute(command);
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this.delegate.execute(new PermitReleasingRunnableDecorator(command, this.taskLimit));
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}
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@Override
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public void shutdown() {
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this.delegate.shutdown();
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}
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@NotNull
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@Override
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public List<Runnable> shutdownNow() {
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return this.delegate.shutdownNow();
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}
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@Override
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public boolean isShutdown() {
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return this.delegate.isShutdown();
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}
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@Override
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public boolean isTerminated() {
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return this.delegate.isTerminated();
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}
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@Override
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public boolean awaitTermination(long timeout, @NotNull TimeUnit unit) throws InterruptedException {
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return this.delegate.awaitTermination(timeout, unit);
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}
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@NotNull
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@Override
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public <T> Future<T> submit(@NotNull Callable<T> task) {
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preExecute(task);
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return this.delegate.submit(new PermitReleasingCallableDecorator<>(task, this.taskLimit));
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}
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@NotNull
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@Override
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public <T> Future<T> submit(@NotNull Runnable task, T result) {
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preExecute(task);
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return this.delegate.submit(new PermitReleasingRunnableDecorator(task, this.taskLimit), result);
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}
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@NotNull
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@Override
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public Future<?> submit(@NotNull Runnable task) {
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preExecute(task);
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return this.delegate.submit(new PermitReleasingRunnableDecorator(task, this.taskLimit));
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}
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@NotNull
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@Override
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public <T> List<Future<T>> invokeAll(@NotNull Collection<? extends Callable<T>> tasks) throws InterruptedException {
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throw new UnsupportedOperationException("invokeAll(tasks) is not supported");
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}
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@NotNull
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@Override
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public <T> List<Future<T>> invokeAll(@NotNull Collection<? extends Callable<T>> tasks,
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long timeout,
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@NotNull TimeUnit unit) throws InterruptedException {
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throw new UnsupportedOperationException("invokeAll(tasks, timeout, unit) is not supported");
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}
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@NotNull
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@Override
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public <T> T invokeAny(@NotNull Collection<? extends Callable<T>> tasks)
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throws InterruptedException, ExecutionException {
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throw new UnsupportedOperationException("invokeAny(tasks) is not supported");
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}
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@Override
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public <T> T invokeAny(@NotNull Collection<? extends Callable<T>> tasks, long timeout, @NotNull TimeUnit unit)
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throws InterruptedException, ExecutionException, TimeoutException {
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throw new UnsupportedOperationException("invokeAny(tasks, timeout, unit) is not supported");
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}
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@Override
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public final String toString() {
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return String.format("%s[availablePermits='%s',timeout='%s',delegate='%s']", getClass().getSimpleName(), this.taskLimit.availablePermits(),
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this.timeout, this.delegate);
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}
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} |