    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 */
    017
    018package org.apache.commons.exec;
    019
    020import java.io.IOException;
    021import java.io.InputStream;
    022import java.io.OutputStream;
    023
    024/**
    025 * Handles stream of subprocesses for {@link Executor}s.
    026 */
    027public interface ExecuteStreamHandler {
    028
    029    /**
    030     * Sets a handler for the error stream of the subprocess.
    031     *
    032     * @param inputStream input stream to read from the error stream from the subprocess.
    033     * @throws IOException thrown when an I/O exception occurs.
    034     */
    035    void setProcessErrorStream(InputStream inputStream) throws IOException;
    036
    037    /**
    038     * Sets a handler for the input stream of the subprocess.
    039     *
    040     * @param outputStream output stream to write to the standard input stream of the subprocess.
    041     * @throws IOException thrown when an I/O exception occurs.
    042     */
    043    void setProcessInputStream(OutputStream outputStream) throws IOException;
    044
    045    /**
    046     * Sets a handler for the output stream of the subprocess.
    047     *
    048     * @param inputStream input stream to read from the error stream from the subprocess.
    049     * @throws IOException thrown when an I/O exception occurs.
    050     */
    051    void setProcessOutputStream(InputStream inputStream) throws IOException;
    052
    053    /**
    054     * Starts handling of the streams.
    055     *
    056     * @throws IOException thrown when an I/O exception occurs.
    057     */
    058    void start() throws IOException;
    059
    060    /**
    061     * Stops handling of the streams - will not be restarted. Will wait for pump threads to complete.
    062     *
    063     * @throws IOException thrown when an I/O exception occurs.
    064     */
    065    void stop() throws IOException;
    066}