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What is the difference between Message producer and Message consumer?
JMS Interview Questions and Answers
(Continued from previous question...)
23. What is the difference between Message producer and
Message consumer?
A1:
Messaging systems provide a host of powerful
advantages over other conventional distributed
computing models. Primarily, they encourage "loose
coupling" between message consumers and message
producers. There is a high degree of anonymity between
producer and consumer: to the message consumer, it
doesn't matter who produced the message, where the
producer lives on the network, or when the message was
produced.
A2:
In Publish/Subscribe model:
A publish/subscribe (pub/sub) messaging system
supports an event driven model where information
consumers and producers participate in the
transmission of messages. Producers "publish" events,
while consumers "subscribe" to events of interest, and
consume the events. Producers associate messages with
a specific topic, and the messaging system routes
messages to consumers based on the topics the
consumers register interest in.
In Point-To-Point model:
In point to point messaging systems, messages are
routed to an individual consumer which maintains a
queue of "incoming" messages. Messaging applications
send messages to a specified queue, and clients
retrieve messages from a queue.
A3:
In Point-To-Point model, one client can send message to the
another client through the Destination.
There is a guarantee to recieve the message whenever
reciever is connected.
example:your telephone answering machine ,outer send a
message to u,but you can recieve those msg whenever u
coonected to answering machine.
In pub/sub model. one publisher,many no.of clients
willbe there,publisher publish the message,subscriber
or consumer can recieve those messages when he got
subscription through the topic.There is no guarantee
consumer can recieve the messages send by the
publisher.
(Continued on next question...)
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