| /* |
| * 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. |
| */ |
| |
| package org.apache.flink.streaming.runtime.tasks.mailbox; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.api.common.operators.MailboxExecutor; |
| import org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor; |
| import org.apache.flink.streaming.runtime.tasks.mailbox.TaskMailbox.MailboxClosedException; |
| import org.apache.flink.util.Preconditions; |
| import org.apache.flink.util.WrappingRuntimeException; |
| import org.apache.flink.util.function.ThrowingRunnable; |
| |
| import javax.annotation.Nonnull; |
| |
| import java.util.Optional; |
| import java.util.concurrent.RejectedExecutionException; |
| |
| /** Implementation of an executor service build around a mailbox-based execution model. */ |
| @Internal |
| public final class MailboxExecutorImpl implements MailboxExecutor { |
| |
| /** The mailbox that manages the submitted runnable objects. */ |
| @Nonnull private final TaskMailbox mailbox; |
| |
| private final int priority; |
| |
| private final StreamTaskActionExecutor actionExecutor; |
| |
| private final MailboxProcessor mailboxProcessor; |
| |
| public MailboxExecutorImpl( |
| @Nonnull TaskMailbox mailbox, int priority, StreamTaskActionExecutor actionExecutor) { |
| this(mailbox, priority, actionExecutor, null); |
| } |
| |
| public MailboxExecutorImpl( |
| @Nonnull TaskMailbox mailbox, |
| int priority, |
| StreamTaskActionExecutor actionExecutor, |
| MailboxProcessor mailboxProcessor) { |
| this.mailbox = mailbox; |
| this.priority = priority; |
| this.actionExecutor = Preconditions.checkNotNull(actionExecutor); |
| this.mailboxProcessor = mailboxProcessor; |
| } |
| |
| public boolean isIdle() { |
| return !mailboxProcessor.isDefaultActionAvailable() |
| && !mailbox.hasMail() |
| && mailbox.getState().isAcceptingMails(); |
| } |
| |
| @Override |
| public void execute( |
| final ThrowingRunnable<? extends Exception> command, |
| final String descriptionFormat, |
| final Object... descriptionArgs) { |
| try { |
| mailbox.put( |
| new Mail( |
| command, priority, actionExecutor, descriptionFormat, descriptionArgs)); |
| } catch (MailboxClosedException mbex) { |
| throw new RejectedExecutionException(mbex); |
| } |
| } |
| |
| @Override |
| public void yield() throws InterruptedException { |
| Mail mail = mailbox.take(priority); |
| try { |
| mail.run(); |
| } catch (Exception ex) { |
| throw WrappingRuntimeException.wrapIfNecessary(ex); |
| } |
| } |
| |
| @Override |
| public boolean tryYield() { |
| Optional<Mail> optionalMail = mailbox.tryTake(priority); |
| if (optionalMail.isPresent()) { |
| try { |
| optionalMail.get().run(); |
| } catch (Exception ex) { |
| throw WrappingRuntimeException.wrapIfNecessary(ex); |
| } |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public boolean shouldInterrupt() { |
| // TODO: FLINK-35051 we shouldn't interrupt for every mail, but only for the time sensitive |
| // ones, for example related to checkpointing. |
| return mailbox.hasMail(); |
| } |
| } |