Topic (Java EE 5 SDK)

A Topic object encapsulates a provider-specific topic name. It is the way a client specifies the identity of a topic to JMS API methods. For those methods that use a Destination as a parameter, a Topic object may used as an argument . For example, a Topic can be used to create a MessageConsumer and a MessageProducer by calling:

Session.CreateConsumer(Destination destination)
Session.CreateProducer(Destination destination)

Many publish/subscribe (pub/sub) providers group topics into hierarchies and provide various options for subscribing to parts of the hierarchy. The JMS API places no restriction on what a Topic object represents. It may be a leaf in a topic hierarchy, or it may be a larger part of the hierarchy.

The organization of topics and the granularity of subscriptions to them is an important part of a pub/sub application's architecture. The JMS API does not specify a policy for how this should be done. If an application takes advantage of a provider-specific topic-grouping mechanism, it should document this. If the application is installed using a different provider, it is the job of the administrator to construct an equivalent topic architecture and create equivalent Topic objects.

版本:: 1.1 - February 2, 2002
作者:: Mark Hapner, Rich Burridge, Kate Stout
另请参见:: Session.createConsumer(Destination), Session.createProducer(Destination), TopicSession.createTopic(String)

方法摘要
`String`	`getTopicName()` Gets the name of this topic.
`String`	`toString()` Returns a string representation of this object.

方法详细信息

getTopicName

String getTopicName()
                    throws JMSException

Gets the name of this topic.

Clients that depend upon the name are not portable.

返回:: the topic name
抛出异常:: JMSException - if the JMS provider implementation of Topic fails to return the topic name due to some internal error.