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What are Building Blocks of a JMS application?
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Answer / neha
Connection :- It is a virtual connection with JMS provider.
Session :- It is a single threaded context for producing and consuming messages.
Message Producer :- It is created from a session and is using to send messages to destinations.
Message Consumers :- It is also created from a session and is using to receive messages from destination.
Message Selector :- To filter the messages received.
Message :-Message objects are sending in JMS. A JMS message has 3 parts
a)header :- It contains a number of predefined fields using for proper delivery and routing.
b)body :- As the name suggests it is the body of messages. JMS API allows five types of message bodies.
1.TextMessage :- Body contains String data
2.ByteMessage :- Body contains byte data
3. MapMessage :- Body contains data in key/value pair
4.StreamMessage :-Body contains a stream of primitive values
5.ObjectMessage : – Body contains an object
6.Message :- Nothing in body. Only header and properties.
c)properties :- Additional properties other than header.
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