Examples with DefaultMQPushConsumer com.alibaba.rocketmq.client.consumer.DefaultMQPushConsumer used on opensource projects

Example 6 with DefaultMQPushConsumer

use of com.alibaba.rocketmq.client.consumer.DefaultMQPushConsumer in project uavstack by uavorg.

the class RocketMQConsumer method initConsumer.

private DefaultMQPushConsumer initConsumer(QueueInfo queueInfo) {
    DefaultMQPushConsumer dmpc = new DefaultMQPushConsumer(consumerConfig.getComsumerGroup());
    /**
     * 设置Consumer第一次启动是从队列头部开始消费还是队列尾部开始消费<br>
     * 如果非第一次启动，那么按照上次消费的位置继续消费
     */
    dmpc.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
    dmpc.setNamesrvAddr(consumerConfig.getNamingServer());
    if (consumerConfig.getPullBatchSize() >= 0) {
        dmpc.setPullBatchSize(50);
    }
    // subscribeTopics
    subscribeTopics(dmpc, queueInfo);
    // 配置是否是单线程的consumer监听，因为在处理事务的时候，使用actor模式，需要单线程处理那些数据库写的请求
    if (consumerConfig.getConsumeThreadMax() != null && consumerConfig.getConsumeThreadMax() > 0) {
        dmpc.setConsumeThreadMax(consumerConfig.getConsumeThreadMax());
    }
    if (consumerConfig.getConsumeThreadMin() != null && consumerConfig.getConsumeThreadMin() > 0) {
        dmpc.setConsumeThreadMin(consumerConfig.getConsumeThreadMin());
    }
    // 进行空值测试，如果没有填写queue类型一律按照queue信息算
    if (MQFactory.QueueType.TOPIC.equals(queueInfo.getQueueType())) {
        dmpc.setMessageModel(MessageModel.BROADCASTING);
    }
    return dmpc;
}