A publish-subscribe messaging framework for GAE

Easy task for GAE app coders.

## Deliverables

I need a Google app that implements implements a publish-subscribe messaging framework in Java.

This should be achievable more or less as follows....

Publish handling:

1) the publisher opens a session, a session Id is sent to the client

2) the publisher sends variable sized chunks of binary/text data to the session

3) if session has subscribers, the received chunks of data are stored with a timestamp and the session Id

4) send fail/success message to publisher

5) repeat from 2 until publisher closes session (by sending a specific message etc.)

6) clear session data

Subscription handling:

1) subscriber subscribes to a session by providing a session id

2) the subscriber polls the server (every X amount of seconds), and

the server replies with all chunks of data for the session not yet retrieved by the client

3) if all subscribers for the session have received all data chunks before time Y, clean up all data chunks with a timestamp less than Y

4) repeat from 2 until subscriber closes session (by sending a specific message etc.)

5) clear subscription related data

IMPORTANT: all the above must be performed withing GAE limitations (including execution preemption) and as efficiently as possible. All communication between publisher/subscriber and the server is over HTTP.

NOTE: Maybe this can be implemented using Channel API for Google App Engine. However note that the publisher/subscriber clients will be applications, not web pages.

Feel free to contact me with any suggestions or clarification queries.

Angelo Zammit

Habilidades: Engenharia, Google App Engine, Java, Linux, Gestão de projetos, Arquitetura de software, Teste de Software, UNIX

Veja mais: not yet received, not received yet, google gae, publish, publish app, messaging app, gae, framework c, channel communication, api coders, google java api, app messaging, google api java, clear linux, google framework, google api suggestions, app java client, subscribe api, google gae java, google publish, app framework, web app framework google, contact java app, google channel, session api

Acerca do Empregador:
( 1 comentário ) Mosta, Malta

ID do Projeto: #3058921

Concedido a:


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$102 USD em 16 dias
(29 Comentários)