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HFE , message-driven question

Poobhathy Kannan
Ranch Hand

Joined: May 26, 2004
Posts: 94
What�s true about message-driven beans? (Choose all that apply)
A.A message-driven bean has a home interface but no component interface.
B.A client never knows a message-driven bean�s identity.
C.A Client sees a message-driven bean as JavaMail message consumer.
D.The lifetime of a message-driven bean is controlled by the container.

Answer
B,D

My View: There are no clients for message-driven beans, then how can we say "A client never knows a message-driven bean�s identity" ?

Pleas explain


http://learnertobeginner.blogspot.com/
Pradeep bhatt
Ranch Hand

Joined: Feb 27, 2002
Posts: 8919

MDB instances are the consumers of the JMS messages. So the applications which send those messages are the client. An MDB never knows the client directly but only through the JMS broker; Nor do the client knows who will consume the messages they produce, they just send the message to broker. This is how loose coupling is acheived in Message oriented systems.


Groovy
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: HFE , message-driven question