    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
    020/**
    021 * Destroys all registered {@link Process} after a certain event, typically when the VM exits.
    022 *
    023 * @see ShutdownHookProcessDestroyer
    024 */
    025public interface ProcessDestroyer {
    026
    027    /**
    028     * Returns {@code true} if the specified {@link Process} was successfully added to the list of processes to be destroy.
    029     *
    030     * @param process the process to add.
    031     * @return {@code true} if the specified {@link Process} was successfully added.
    032     */
    033    boolean add(Process process);
    034
    035    /**
    036     * Returns {@code true} if the specified {@link Process} was successfully removed from the list of processes to be destroy.
    037     *
    038     * @param process the process to remove.
    039     * @return {@code true} if the specified {@link Process} was successfully removed.
    040     */
    041    boolean remove(Process process);
    042
    043    /**
    044     * Returns the number of registered processes.
    045     *
    046     * @return the number of register process.
    047     */
    048    int size();
    049}