/**
* 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.impl.consumer;
import java.util.List;
import java.util.Set;
import com.alibaba.rocketmq.client.consumer.AllocateMessageQueueStrategy;
import com.alibaba.rocketmq.client.consumer.store.OffsetStore;
import com.alibaba.rocketmq.client.consumer.store.ReadOffsetType;
import com.alibaba.rocketmq.client.impl.factory.MQClientFactory;
import com.alibaba.rocketmq.common.MixAll;
import com.alibaba.rocketmq.common.consumer.ConsumeFromWhere;
import com.alibaba.rocketmq.common.message.MessageQueue;
import com.alibaba.rocketmq.common.protocol.heartbeat.MessageModel;
/**
* @author shijia.wxr<vintage.wang@gmail.com>
* @since 2013-6-22
*/
public class RebalancePushImpl extends RebalanceImpl {
private final DefaultMQPushConsumerImpl defaultMQPushConsumerImpl;
public RebalancePushImpl(DefaultMQPushConsumerImpl defaultMQPushConsumerImpl) {
this(null, null, null, null, defaultMQPushConsumerImpl);
}
public RebalancePushImpl(String consumerGroup, MessageModel messageModel,
AllocateMessageQueueStrategy allocateMessageQueueStrategy, MQClientFactory mQClientFactory,
DefaultMQPushConsumerImpl defaultMQPushConsumerImpl) {
super(consumerGroup, messageModel, allocateMessageQueueStrategy, mQClientFactory);
this.defaultMQPushConsumerImpl = defaultMQPushConsumerImpl;
}
@Override
public void dispatchPullRequest(List<PullRequest> pullRequestList) {
// 派发PullRequest
for (PullRequest pullRequest : pullRequestList) {
this.defaultMQPushConsumerImpl.executePullRequestImmediately(pullRequest);
log.info("doRebalance, {}, add a new pull request {}", consumerGroup, pullRequest);
}
}
@Override
public long computePullFromWhere(MessageQueue mq) {
long result = -1;
final ConsumeFromWhere consumeFromWhere =
this.defaultMQPushConsumerImpl.getDefaultMQPushConsumer().getConsumeFromWhere();
final OffsetStore offsetStore = this.defaultMQPushConsumerImpl.getOffsetStore();
switch (consumeFromWhere) {
case CONSUME_FROM_LAST_OFFSET: {
long lastOffset = offsetStore.readOffset(mq, ReadOffsetType.READ_FROM_STORE);
if (lastOffset >= 0) {
result = lastOffset;
}
// 当前订阅组在服务器没有对应的Offset
// 说明是第一次启动
else if (-1 == lastOffset) {
// 如果是重试队列，需要从0开始
if (mq.getTopic().startsWith(MixAll.RETRY_GROUP_TOPIC_PREFIX)) {
result = 0L;
}
// 正常队列则从末尾开始
else {
result = Long.MAX_VALUE;
}
}
// 发生其他错误
else {
result = -1;
}
break;
}
case CONSUME_FROM_LAST_OFFSET_AND_FROM_MIN_WHEN_BOOT_FIRST: {
long lastOffset = offsetStore.readOffset(mq, ReadOffsetType.READ_FROM_STORE);
if (lastOffset >= 0) {
result = lastOffset;
}
// 当前订阅组在服务器没有对应的Offset
// 说明是第一次启动
else if (-1 == lastOffset) {
result = 0L;
}
// 发生其他错误
else {
result = -1;
}
break;
}
case CONSUME_FROM_MAX_OFFSET:
result = Long.MAX_VALUE;
break;
case CONSUME_FROM_MIN_OFFSET:
result = 0L;
break;
default:
break;
}
return result;
}
@Override
public void messageQueueChanged(String topic, Set<MessageQueue> mqAll, Set<MessageQueue> mqDivided) {
}
@Override
public void removeUnnecessaryMessageQueue(MessageQueue mq, ProcessQueue pq) {
this.defaultMQPushConsumerImpl.getOffsetStore().persist(mq);
this.defaultMQPushConsumerImpl.getOffsetStore().removeOffset(mq);
if (this.defaultMQPushConsumerImpl.isConsumeOrderly()) {
this.unlock(mq, true);
}
}
}