JMS Selector is a filtering facility provided by JMS Provider or broker. Suppose a client is only interested in listening to some specific messages and not all traffic from Server than it can either filter messages upon receiving, or it can use JMS selector to do the filtering on Broker itself. JMS Selector allows you to specify filtering criteria in the form of String, which is a subset of SQL conditional expression.
For example, if you are interested in messages which are for stocks starts with A, you can specific condition as SYMBOL like "A%", where SYMBOL is a user-defined Message property set by Sender.
Since JMS Selector can not select messages based upon the content of the message body, it's the sender's responsibility to populate an agreed Message Property for each message. Since selection is done on the broker side, a JMS selector is provided to the broker by the consumer while subscribing to a topic or listening to Queue.
After that, this consumer will only receive the message which passes the condition specified as part of the JMS selector string. JMS Selector can be a handy feature to implement load balancing, for example, you can create multiple instances of your application, each listening on a subset of stocks, specified by JMS Selector.
Posted Date:- 2021-11-11 07:40:04
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