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 */ 017package org.apache.activemq.broker.region.policy; 018 019import org.apache.activemq.broker.Broker; 020import org.apache.activemq.broker.region.DurableTopicSubscription; 021import org.apache.activemq.broker.region.Subscription; 022import org.apache.activemq.broker.region.cursors.PendingMessageCursor; 023import org.apache.activemq.broker.region.cursors.StoreDurableSubscriberCursor; 024import org.apache.activemq.kaha.Store; 025 026/** 027 * Creates a PendingMessageCursor that access the persistent store to retrieve 028 * messages 029 * 030 * @org.apache.xbean.XBean element="storeDurableSubscriberCursor" 031 * description="Pending messages for a durable 032 * subscriber are referenced from the Store" 033 * 034 */ 035public class StorePendingDurableSubscriberMessageStoragePolicy implements PendingDurableSubscriberMessageStoragePolicy { 036 boolean immediatePriorityDispatch = true; 037 038 public boolean isImmediatePriorityDispatch() { 039 return immediatePriorityDispatch; 040 } 041 042 /** 043 * Ensure that new higher priority messages will get an immediate dispatch 044 * rather than wait for the end of the current cursor batch. 045 * 046 * @param immediatePriorityDispatch 047 */ 048 public void setImmediatePriorityDispatch(boolean immediatePriorityDispatch) { 049 this.immediatePriorityDispatch = immediatePriorityDispatch; 050 } 051 052 /** 053 * Retrieve the configured pending message storage cursor; 054 * @param broker 055 * 056 * @param clientId 057 * @param name 058 * @param maxBatchSize 059 * @param sub 060 * @return the Pending Message cursor 061 */ 062 public PendingMessageCursor getSubscriberPendingMessageCursor(Broker broker,String clientId, String name, int maxBatchSize, DurableTopicSubscription sub) { 063 StoreDurableSubscriberCursor cursor = new StoreDurableSubscriberCursor(broker,clientId, name, maxBatchSize, sub); 064 cursor.setImmediatePriorityDispatch(isImmediatePriorityDispatch()); 065 return cursor; 066 } 067}