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.memory.buffer;
  
  /**
   * Represents a collection of MessageQueue instances which are all bound by the
   * same memory buffer to fix the amount of RAM used to some uppper bound.
   * 
   * 
   */
  public interface MessageBuffer {
  
      int getSize();
  
      /**
       * Creates a new message queue instance
       */
      MessageQueue createMessageQueue();
  
      /**
       * After a message queue has changed we may need to perform some evictions
       * 
       * @param delta
       * @param queueSize
       */
      void onSizeChanged(MessageQueue queue, int delta, int queueSize);
  
      void clear();
  
  }
  