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Publish-Subscribe Model: Transport and Session

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Questions and Answers

What is the primary function of a transport?

To publish events to a topic

To receive events from a topic

To establish a conversation between two peers

To connect two peers (correct)

In a publish-subscribe model, what role does a publisher play?

Publishes events to a topic (correct)

Establishes a conversation between peers

Receives events from a topic

Maintains a list of topics

What is a session in the context of peer communication?

A conversation between two peers (correct)

A topic maintained by a broker

A connection between two peers

A role played by a client

What is the role of a subscriber in a publish-subscribe model?

Receives events from a topic Signup and view all the answers

What is the relationship between a client and a role in a publish-subscribe model?

A client can have multiple roles Signup and view all the answers

In an RPC model, what is the primary role of a caller?

Issues calls to the remote procedures along with call arguments Signup and view all the answers

What is the role of a broker in a publish-subscribe model?

Acts as a router and routes messages published to a topic Signup and view all the answers

In an RPC model, what is the primary role of a callee?

Executes the procedures to which the calls are issued Signup and view all the answers

What is the role of a router in an RPC model?

Performs generic call and event routing Signup and view all the answers

What is the relationship between a caller and a callee in an RPC model?

The caller issues the calls and the callee executes the remote procedures Signup and view all the answers

Study Notes

Transport and Session

Transport is a channel that connects two peers.
A session is a conversation between two peers that runs over a transport.

A client can have one or more roles.
In the publish-subscribe model, a client can be a:
- Publisher: Publishes events (including payload) to the topic maintained by the Broker.
- Subscriber: Subscribes to the topics and receives the events including the payload.

RPC Model Roles

In the RPC model, a client can have three main roles:

Caller

Issues calls to remote procedures
Provides call arguments along with the calls

Callee

Executes the procedures called by the caller
Returns the results back to the caller

Router

Performs generic call and event routing
Acts as a broker in the publish-subscribe model

Broker

Routes messages published to a topic to all subscribers
Subscribers are those who have subscribed to the topic

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Description

This quiz covers the basics of the publish-subscribe model, including transport and session definitions, and client roles as publishers and subscribers.