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com.signalfx.shaded.jetty.util.thread.strategy.ProduceExecuteConsume Maven / Gradle / Ivy

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//  Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
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//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
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//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
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//  You may elect to redistribute this code under either of these licenses.
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package com.signalfx.shaded.jetty.util.thread.strategy;

import java.util.concurrent.Executor;

import com.signalfx.shaded.jetty.util.log.Log;
import com.signalfx.shaded.jetty.util.log.Logger;
import com.signalfx.shaded.jetty.util.thread.ExecutionStrategy;
import com.signalfx.shaded.jetty.util.thread.Invocable;
import com.signalfx.shaded.jetty.util.thread.Invocable.InvocationType;
import com.signalfx.shaded.jetty.util.thread.Locker;
import com.signalfx.shaded.jetty.util.thread.Locker.Lock;

/**
 * 

A strategy where the caller thread iterates over task production, submitting each * task to an {@link Executor} for execution.

*/ public class ProduceExecuteConsume implements ExecutionStrategy { private static final Logger LOG = Log.getLogger(ProduceExecuteConsume.class); private final Locker _locker = new Locker(); private final Producer _producer; private final Executor _executor; private State _state = State.IDLE; public ProduceExecuteConsume(Producer producer, Executor executor) { _producer = producer; _executor = executor; } @Override public void produce() { try (Lock locked = _locker.lock()) { switch (_state) { case IDLE: _state = State.PRODUCE; break; case PRODUCE: case EXECUTE: _state = State.EXECUTE; return; } } // Produce until we no task is found. while (true) { // Produce a task. Runnable task = _producer.produce(); if (LOG.isDebugEnabled()) LOG.debug("{} produced {}", _producer, task); if (task == null) { try (Lock locked = _locker.lock()) { switch (_state) { case IDLE: throw new IllegalStateException(); case PRODUCE: _state = State.IDLE; return; case EXECUTE: _state = State.PRODUCE; continue; } } } // Execute the task. if (Invocable.getInvocationType(task) == InvocationType.NON_BLOCKING) task.run(); else _executor.execute(task); } } @Override public void dispatch() { _executor.execute(() -> produce()); } private enum State { IDLE, PRODUCE, EXECUTE } }




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