TopicRequestor (Java EE 5)

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javax.jms Class TopicRequestor

java.lang.Object
  javax.jms.TopicRequestor

public class TopicRequestor
extends Object

TopicRequestor 帮助类简化了服务请求的建立。

TopicRequestor 构造方法提供有非事务性 TopicSession 和目的地 Topic。它创建用于响应的 TemporaryTopic，并提供发送请求消息和等待其回复的 request 方法。

这是基本的请求/回复抽象，应该足以满足大部分使用情况。JMS 提供者和客户端可以随意创建更复杂的版本。

version

1.0 - 8 July 1998

See also

javax.jms.QueueRequestor

英文文档：

The TopicRequestor helper class simplifies making service requests.

The TopicRequestor constructor is given a non-transacted TopicSession and a destination Topic. It creates a TemporaryTopic for the responses and provides a request method that sends the request message and waits for its reply.

This is a basic request/reply abstraction that should be sufficient for most uses. JMS providers and clients are free to create more sophisticated versions.

Version:: 1.0 - 8 July 1998
Author:: Mark Hapner, Rich Burridge
See Also:: QueueRequestor

Constructor Summary
`TopicRequestor(TopicSession session, Topic topic)` Constructor for the `TopicRequestor` class.

Method Summary
`void`	`close()` Closes the `TopicRequestor` and its session.
`Message`	`request(Message message)` Sends a request and waits for a reply.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

public TopicRequestor(TopicSession session, Topic topic) throws JMSException
`TopicRequestor` 类的构造方法。
此实现假定会话参数为非事务性，传送模式为 `AUTO_ACKNOWLEDGE` 或 `DUPS_OK_ACKNOWLEDGE`。

session 主题所属的 `TopicSession`

topic 要执行请求/回复调用的主题

Throws JMSException: 如果 JMS 提供者由于某个内部错误无法创建 `TopicRequestor`。

Throws InvalidDestinationException: 如果指定了无效的主题。

英文文档：
TopicRequestor

public TopicRequestor(TopicSession session,
                      Topic topic)
               throws JMSException

Constructor for the TopicRequestor class.

This implementation assumes the session parameter to be non-transacted, with a delivery mode of either AUTO_ACKNOWLEDGE or DUPS_OK_ACKNOWLEDGE.

Parameters:: session - the TopicSession the topic belongs to; topic - the topic to perform the request/reply call on
Throws:: JMSException - if the JMS provider fails to create the TopicRequestor due to some internal error.; InvalidDestinationException - if an invalid topic is specified.

Method Detail

public Message request(Message message) throws JMSException
发送请求并等待回复。临时主题用于 `JMSReplyTo` 目的地；返回第一个回复，并丢弃后面的回复。

message 要发送的消息

return 回复消息

Throws JMSException: 如果 JMS 提供者由于某个内部错误无法完成请求。

英文文档：
request

public Message request(Message message)
                throws JMSException

Sends a request and waits for a reply. The temporary topic is used for the JMSReplyTo destination; the first reply is returned, and any following replies are discarded.

Parameters:: message - the message to send
Returns:: the reply message
Throws:: JMSException - if the JMS provider fails to complete the request due to some internal error.

public void close() throws JMSException
关闭 `TopicRequestor` 及其会话。
由于提供者可能会代表 `TopicRequestor` 分配 Java 虚拟机之外的某些资源，因此不需要这些资源时客户端应该关闭它们。依赖于垃圾收集最终回收这些资源可能不够及时。
注意，此方法关闭传递给 `TopicRequestor` 构造方法的 `TopicSession` 对象。

Throws JMSException: 如果 JMS 提供者由于某个内部错误无法关闭 `TopicRequestor`。

英文文档：
close

public void close()
           throws JMSException

Closes the TopicRequestor and its session.

Since a provider may allocate some resources on behalf of a TopicRequestor outside the Java virtual machine, clients should close them when they are not needed. Relying on garbage collection to eventually reclaim these resources may not be timely enough.

Note that this method closes the TopicSession object passed to the TopicRequestor constructor.

Throws:: JMSException - if the JMS provider fails to close the TopicRequestor due to some internal error.