ActiveMQ example source code file (ServiceStopper.java)

This example ActiveMQ source code file (ServiceStopper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

could, exception, exception, iterator, logger, reason, reason, runtimeexception, runtimeexception, service, servicestopper, throwable, throwable, unknown, util

The ActiveMQ ServiceStopper.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.util;

import java.util.Iterator;
import java.util.List;

import org.apache.activemq.Service;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A helper class used to stop a bunch of services, catching and logging any
 * exceptions and then throwing the first exception when everything is stoped.
 * 
 * 
 */
public class ServiceStopper {
    private Throwable firstException;

    /**
     * Stops the given service, catching any exceptions that are thrown.
     */
    public void stop(Service service) {
        try {
            if (service != null) {
                service.stop();
            }
        } catch (Exception e) {
            onException(service, e);
        }
    }

    /**
     * Performs the given code to stop some service handling the exceptions
     * which may be thrown properly
     */
    public void run(Callback stopClosure) {
        try {
            stopClosure.execute();
        } catch (Throwable e) {
            onException(stopClosure, e);
        }
    }

    /**
     * Stops a list of services
     */
    public void stopServices(List services) {
        for (Iterator iter = services.iterator(); iter.hasNext();) {
            Service service = (Service)iter.next();
            stop(service);
        }
    }

    public void onException(Object owner, Throwable e) {
        logError(owner, e);
        if (firstException == null) {
            firstException = e;
        }
    }

    /**
     * Throws the first exception that was thrown if there was one.
     */
    public void throwFirstException() throws Exception {
        if (firstException != null) {
            if (firstException instanceof Exception) {
                Exception e = (Exception)firstException;
                throw e;
            } else if (firstException instanceof RuntimeException) {
                RuntimeException e = (RuntimeException)firstException;
                throw e;
            } else {
                throw new RuntimeException("Unknown type of exception: " + firstException, firstException);
            }
        }
    }

    protected void logError(Object service, Throwable e) {
        Logger log = LoggerFactory.getLogger(service.getClass());
        log.error("Could not stop service: " + service + ". Reason: " + e, e);
    }

}