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.broker.region.group;
018    
019    /**
020     * A factory to create instances of {@link SimpleMessageGroupMap} when
021     * implementing the <a
022     * href="http://activemq.apache.org/message-groups.html">Message
023     * Groups</a> functionality.
024     * 
025     * @org.apache.xbean.XBean
026     * 
027     * 
028     */
029    public class MessageGroupHashBucketFactory implements MessageGroupMapFactory {
030    
031        private int bucketCount = 1024;
032    
033        public MessageGroupMap createMessageGroupMap() {
034            return new MessageGroupHashBucket(bucketCount);
035        }
036    
037        public int getBucketCount() {
038            return bucketCount;
039        }
040    
041        /**
042         * Sets the number of hash buckets to use for the message group
043         * functionality. This is only applicable to using message groups to
044         * parallelize processing of a queue while preserving order across an
045         * individual JMSXGroupID header value. This value sets the number of hash
046         * buckets that will be used (i.e. the maximum possible concurrency).
047         */
048        public void setBucketCount(int bucketCount) {
049            this.bucketCount = bucketCount;
050        }
051    
052    }