org.jboss.weld.manager.SingleThreadExecutorServices Maven / Gradle / Ivy

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.weld.manager;

import org.jboss.weld.manager.api.ExecutorServices;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/**
 * @author pmuir
 */
public class SingleThreadExecutorServices implements ExecutorServices {

    private final transient ExecutorService taskExecutor = Executors.newSingleThreadExecutor();


    /**
     * Provides access to the executor service used for asynchronous tasks.
     *
     * @return the ExecutorService for this manager
     */
    public ExecutorService getTaskExecutor() {
        return taskExecutor;
    }

    public void cleanup() {
        taskExecutor.shutdown();
        try {
            // Wait a while for existing tasks to terminate
            if (!taskExecutor.awaitTermination(60, TimeUnit.SECONDS)) {
                taskExecutor.shutdownNow(); // Cancel currently executing tasks
                // Wait a while for tasks to respond to being cancelled
                if (!taskExecutor.awaitTermination(60, TimeUnit.SECONDS)) {
                    // Log the error here
                }
            }
        } catch (InterruptedException ie) {
            // (Re-)Cancel if current thread also interrupted
            taskExecutor.shutdownNow();
            // Preserve interrupt status
            Thread.currentThread().interrupt();
        }
    }

}