12 客户端高级选项

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12 Advanced client options

12 客户端高级选项

 

This chapter covers

? How to use exclusive consumers

? The power of message groups

? Understanding support for streams and blobs

? The failover transport

? Scheduling message delivery

 

本章内容包括

如何使用排他性消费者

消息群组功能

理解代理对流和二进制消息的支持

失效转移传输

消息发送调度

 

 

In the last chapter we covered advanced ActiveMQ broker features. In this chapter

we’re going to look at some advanced features on the client side of ActiveMQ. We’ll

look at how to ensure that one message consumer will receive messages from a

queue, regardless of how many message consumers have subscribed to it. This feature

is called exclusive consumer, and can be used for ensuring that messages are

always consumed in order, or as a distributed locking mechanism—for which we

have an example. 

 

上一章内容包含了ActiveMQ代理高级特性的相关内容.本章中,我们将看到ActiveMQ代理客户端

的一些高级特性.我们将看到如何确保消息消费者能够从队列收到消息而不管这个队列中注册了多

少个消息消费者.这个特性称为消费者排除,用于保证消息始终被按顺序处理,也可以作为分布式锁

机制--关于这个点我们有个示例.

 

We’ll look  at message  groups, where  messages can  be grouped  together to be

consumed by the same message  consumer. ActiveMQ supports two different  ways to

send  large   payloads  through   ActiveMQ—using  ActiveMQ   streams  and  blob

messages—and we’ll look at both methods. As the client-side failover transport

protocol is  important for  applications to  survive network  outages and broker

failure, we’ll look at its nuances in more detail. And, finally, we’ll look at

sending messages with a delay, and delay using scheduled messages.

 

我们将看到消息群组,使用消息群组后消息可以被分组并且被同一个消息消费者处理.

ActiveMQ支持发送两种类型的负载--使用ActiveMQ流和二进制消息,后面我们将说明

这两种方式的使用方法.在应用程序应对网络故障或者代理失效时,客户端的失效转移连接协议

十分重要,我们将更详细的说明应对上述两种问题的细节.最后,我们将看到消息发送延迟--

使用消息调度实现消息延迟发送.

 

One feature that you might be expecting in this chapter is different modes for

client-side acknowledgement of messages. As we’ll find out in the next chapter on

ActiveMQ performance tuning, choosing the right mode for acknowledgement of

messages is critical for good performance, so we’ll cover acknowledgement modes

and their consequences there.

 

你可能会期望本章内容中会介绍客户端中关于消息确认的不同模式.正如我们将在下面介绍ActiveMQ

性能调优的章节中看到的那样,选择正确的消息确认模式对于性能来说是至关重要的,因此我们将关注

消息确认模式并关注选择了不同小气模式后的结果.