    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     */
    018
    019    package org.apache.commons.exec;
    020
    021    /**
    022     * Destroys all registered {@link java.lang.Process} after a certain event,
    023     * typically when the VM exits
    024     * @see org.apache.commons.exec.ShutdownHookProcessDestroyer
    025     */
    026    public interface ProcessDestroyer {
    027
    028            /**
    029             * Returns <code>true</code> if the specified
    030             * {@link java.lang.Process} was
    031             * successfully added to the list of processes to be destroy.
    032             *
    033             * @param process
    034             *      the process to add
    035             * @return <code>true</code> if the specified
    036             *              {@link java.lang.Process} was
    037             *      successfully added
    038             */
    039            boolean add(Process process);
    040
    041            /**
    042             * Returns <code>true</code> if the specified
    043             * {@link java.lang.Process} was
    044             * successfully removed from the list of processes to be destroy.
    045             *
    046             * @param process
    047             *            the process to remove
    048             * @return <code>true</code> if the specified
    049             *              {@link java.lang.Process} was
    050             *      successfully removed
    051             */
    052            boolean remove(Process process);
    053
    054        /**
    055         * Returns the number of registered processes.
    056         *
    057         * @return the number of register process
    058         */
    059        int size();
    060    }