com.alibaba.rocketmq.client.producer.selector.SelectMessageQueueByHash Maven / Gradle / Ivy
/**
* Copyright (C) 2010-2013 Alibaba Group Holding Limited
*
* Licensed 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 com.alibaba.rocketmq.client.producer.selector;
import java.util.List;
import com.alibaba.rocketmq.client.producer.MessageQueueSelector;
import com.alibaba.rocketmq.common.message.Message;
import com.alibaba.rocketmq.common.message.MessageQueue;
/**
* @author shijia.wxr
* @since 2013-6-27
*/
public class SelectMessageQueueByHash implements MessageQueueSelector {
@Override
public MessageQueue select(List mqs, Message msg, Object arg) {
int value = arg.hashCode();
if (value < 0) {
value = Math.abs(value);
}
value = value % mqs.size();
return mqs.get(value);
}
}