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.camel;
018
019import java.io.IOException;
020
021/**
022 * Represents the core lifecycle API for services which can be initialized, started and stopped
023 */
024public interface Service extends AutoCloseable {
025
026    /**
027     * Initialize the service
028     *
029     * @throws RuntimeCamelException is thrown if initialization failed
030     */
031    default void init() {
032    }
033
034    /**
035     * Starts the service
036     *
037     * @throws RuntimeCamelException is thrown if starting failed
038     */
039    void start();
040
041    /**
042     * Stops the service
043     *
044     * @throws RuntimeCamelException is thrown if stopping failed
045     */
046    void stop();
047
048    /**
049     * Delegates to {@link Service#stop()} so it can be used in
050     * try-with-resources expression.
051     * 
052     * @throws IOException per contract of {@link AutoCloseable} if
053     *             {@link Service#stop()} fails
054     */
055    default void close() throws IOException {
056        try {
057            stop();
058        } catch (RuntimeException e) {
059            throw e;
060        } catch (Exception e) {
061            throw new IOException(e);
062        }
063    }
064}
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