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.broker;
  
  import java.util.concurrent.atomic.AtomicReference;
  
  /**
   * Like a BrokerFilter but it allows you to switch the getNext().broker. This
   * has more overhead than a BrokerFilter since access to the getNext().broker
   * has to synchronized since it is mutable
   *
   *
   */
  public class MutableBrokerFilter extends BrokerFilter {
  
      protected AtomicReference<Broker> next = new AtomicReference<Broker>();
  
      public MutableBrokerFilter(Broker next) {
      	super(null); // prevent future code from using the inherited 'next'
          this.next.set(next);
      }
  
      @Override
      public Broker getAdaptor(Class<?> type) {
          if (type.isInstance(this)) {
              return this;
          }
          return next.get().getAdaptor(type);
      }
  
      public Broker getNext() {
          return next.get();
      }
  
      public void setNext(Broker next) {
          this.next.set(next);
      }
  
  }
  