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 }