    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *     http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.exec;
    018
    019import java.io.File;
    020import java.util.concurrent.ThreadFactory;
    021
    022/**
    023 * Runs daemon processes asynchronously. Callers are expected to register a {@link ProcessDestroyer} before executing any processes.
    024 *
    025 * @since 1.3
    026 */
    027public class DaemonExecutor extends DefaultExecutor {
    028
    029    /**
    030     * Constructs a new builder.
    031     *
    032     * @since 1.4.0
    033     */
    034    public static class Builder extends DefaultExecutor.Builder<Builder> {
    035
    036        /**
    037         * Creates a new configured DaemonExecutor.
    038         *
    039         * @return a new configured DaemonExecutor.
    040         */
    041        @Override
    042        public DefaultExecutor get() {
    043            return new DaemonExecutor(getThreadFactory(), getExecuteStreamHandler(), getWorkingDirectory());
    044        }
    045
    046    }
    047
    048    /**
    049     * Creates a new builder.
    050     *
    051     * @return a new builder.
    052     * @since 1.4.0
    053     */
    054    public static Builder builder() {
    055        return new Builder();
    056    }
    057
    058    /**
    059     * Constructs a new instance.
    060     *
    061     * @deprecated Use {@link Builder#get()}.
    062     */
    063    @Deprecated
    064    public DaemonExecutor() {
    065        // super
    066    }
    067
    068    private DaemonExecutor(final ThreadFactory threadFactory, final ExecuteStreamHandler executeStreamHandler, final File workingDirectory) {
    069        super(threadFactory, executeStreamHandler, workingDirectory);
    070    }
    071
    072    /**
    073     * Factory method to create a thread waiting for the result of an asynchronous execution.
    074     *
    075     * @param runnable the runnable passed to the thread.
    076     * @param name     the name of the thread.
    077     * @return the thread.
    078     */
    079    @Override
    080    protected Thread createThread(final Runnable runnable, final String name) {
    081        final Thread thread = super.createThread(runnable, name);
    082        thread.setDaemon(true);
    083        return thread;
    084    }
    085}