content: /**
   * 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 {
                  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);
      }
  
  }
  