| /** |
| * 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.broker.region.policy; |
| |
| import org.apache.activemq.broker.region.TopicSubscription; |
| |
| /** |
| * This PendingMessageLimitStrategy sets the maximum pending message limit value to be |
| * a multiplier of the prefetch limit of the subscription. |
| * |
| * @org.apache.xbean.XBean |
| * |
| * |
| */ |
| public class PrefetchRatePendingMessageLimitStrategy implements PendingMessageLimitStrategy { |
| |
| private double multiplier = 0.5; |
| |
| public int getMaximumPendingMessageLimit(TopicSubscription subscription) { |
| int prefetchSize = subscription.getConsumerInfo().getPrefetchSize(); |
| return (int) (prefetchSize * multiplier); |
| } |
| |
| public double getMultiplier() { |
| return multiplier; |
| } |
| |
| /** |
| * Sets the multiplier of the prefetch size which will be used to define the maximum number of pending |
| * messages for non-durable topics before messages are discarded. |
| */ |
| public void setMultiplier(double rate) { |
| this.multiplier = rate; |
| } |
| |
| } |