Instant messaging

[Teja Saab]

Would you consider instant messaging an example of Point-to-Point communication or publish/subscribe communication?

Think about it. Instant messaging can be used between two individuals who are involved in a chat session. On the other hand, it can also be used by someone like a server administrator to send out a broadcast instant message to all employees in the company to indicate that the server would be down for a few minutes.

Without any additional information to go with the question, if you had to select only one of the two JMS messaging models for instant messaging, which one would you choose and why?

Thanks

[Cameron Wallace McKenzie]

It's not publish/subscribe.

[Teja Saab]

Cameron Wallace McKenzie wrote:It's not publish/subscribe.

Hmmm. I was leaning more towards publish/subscribe if I had to select only one since point to point communication just happens to be a specialized case of publish/subscribe where there is exactly one message sender and one message receiver.

In other words,

Publish/Subscribe: One MessageProducer sending to a JMS Destination and multiple (potentially unknown number) of MessageConsumer
Point to Point: One MessageProducer sending to a JMS Destination and one MessageConsumer.

[srivastava ashish]

Teja Saab wrote:

Cameron Wallace McKenzie wrote:It's not publish/subscribe.

Hmmm. I was leaning more towards publish/subscribe if I had to select only one since point to point communication just happens to be a specialized case of publish/subscribe where there is exactly one message sender and one message receiver.

In other words,

Publish/Subscribe: One MessageProducer sending to a JMS Destination and multiple (potentially unknown number) of MessageConsumer
Point to Point: One MessageProducer sending to a JMS Destination and one MessageConsumer.

Instant messaging could be considered an example of JMS queue with only one consumer and message is consumed only once .Broadcast messages are example of JMS topics with publish/subscribe .


Ashish

[Teja Saab]

That was my point. Instant Messaging can be used in a situation where it can be consumed only once (as in a 2 person chat) or can be consumed several times (as in a company wide broadcast by a server administrator). So the question was if you had to select only one of the two, which one would it be?

I think if I select publish/subscribe, it will cater to both situations since point to point happens to be a special case of publish/subscribe.

Just my $.02

[srivastava ashish]

Teja Saab wrote:That was my point. Instant Messaging can be used in a situation where it can be consumed only once (as in a 2 person chat) or can be consumed several times (as in a company wide broadcast by a server administrator). So the question was if you had to select only one of the two, which one would it be?

I think if I select publish/subscribe, it will cater to both situations since point to point happens to be a special case of publish/subscribe.

Just my $.02

In your solution you need to have two separate Topics.One for 1-1 message and the other for broadcast because all active subscriber to a topic will get the message.However if you are using two Topics why not use one Topic and one Queue??

[Teja Saab]

srivastava ashish wrote:

Teja Saab wrote:That was my point. Instant Messaging can be used in a situation where it can be consumed only once (as in a 2 person chat) or can be consumed several times (as in a company wide broadcast by a server administrator). So the question was if you had to select only one of the two, which one would it be?

I think if I select publish/subscribe, it will cater to both situations since point to point happens to be a special case of publish/subscribe.

Just my $.02

In your solution you need to have two separate Topics.One for 1-1 message and the other for broadcast because all active subscriber to a topic will get the message.However if you are using two Topics why not use one Topic and one Queue??

Hi Ashish,

Maybe I did not articulate my point properly. I am not trying to create a solution for Instant Messaging. Rather I am trying to ascertain if Instant Messaging can best be considered as an example of Point to Point messaging, Publish Subscribe Messaging or both.


In other words, if we had a question similar to the one below in Part 1, which one of the options would you select.

Instant Messaging can be considered as an example of .......

(a) Point to Point messaging
(b) Publish Subscribe messaging
(c) Both
(d) Neither

Thanks

[srivastava ashish]

Got your point ..I would consider "Both" as the answer.

[Bernardo Hermont]

Instant Messaging does not require a queue, P2P does.

Regards