rocketmq-go/service/mq_fault_strategy.go

/*
 * 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 service

import (
	"errors"
	"github.com/apache/incubator-rocketmq-externals/rocketmq-go/model"
)

type MQFaultStrategy struct {
}

//if first select : random one
//if has error broker before ,skip the err broker
func selectOneMessageQueue(topicPublishInfo *model.TopicPublishInfo, lastFailedBroker string) (mqQueue model.MessageQueue, err error) {
	queueIndex := topicPublishInfo.FetchQueueIndex()
	queues := topicPublishInfo.MessageQueueList
	if len(lastFailedBroker) == 0 {
		mqQueue = queues[queueIndex]
		return
	}
	for i := 0; i < len(queues); i++ {
		nowQueueIndex := queueIndex + i
		if nowQueueIndex >= len(queues) {
			nowQueueIndex = nowQueueIndex - len(queues)
		}
		if lastFailedBroker == queues[nowQueueIndex].BrokerName {
			continue
		}
		mqQueue = queues[nowQueueIndex]
		return
	}
	err = errors.New("send to [" + lastFailedBroker + "] fail,no other broker")
	return
}