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     */
017    package org.apache.activemq.transport.udp;
018    
019    import java.nio.ByteBuffer;
020    
021    import org.apache.activemq.Service;
022    
023    /**
024     * Represents a pool of {@link ByteBuffer} instances. 
025     * This strategy could just create new buffers for each call or
026     * it could pool them.
027     * 
028     * 
029     */
030    public interface ByteBufferPool extends Service {
031    
032        /**
033         * Extract a buffer from the pool.
034         */
035        ByteBuffer borrowBuffer();
036    
037        /**
038         * Returns the buffer to the pool or just discards it for a non-pool strategy
039         */
040        void returnBuffer(ByteBuffer buffer);
041    
042        /**
043         * Sets the default size of the buffers
044         */
045        void setDefaultSize(int defaultSize);
046    
047    }