get all keys that starts with namespace prefix

[Mudassir Maredia]

I have a web-sockets application where I need to use Redis and Jedis as a client. When  a web sockets request comes in to the controller I save it using Jedis.set("websockets:<long socket id>", "sessionId");
There is another process that sends out data to all sockets. How can I get:

1. all socket IDs that starts with "websockets:" OR all data as collection at least ?
2. To close all sockets when user session time outs , how can I get all socket IDs based on sessionId ?

Mudassir.

[Marcos Lilljedahl]

Mudassir

Why are you storing your socket ids as standard keys? I believe the best thing is to use a hashmap and do something like. 

Jedis.hset("websockets", "<long socket id>", "sessionId")

Then, if you need to retrieve a specific sessionId the operation would be very simple

Jedis.hget("websockets","<long socket id>");

At the same time if you need to retrieve the complete list you can do

Jedis.hgetall("websockets"); 

And this will return the complete list of websockets

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[Mudassir Maredia]

Thanks Marcos,

The approach you highlighted makes more sense. I changed my code to use hset and hget but it is throwing this error while I try to set some value using hset. Do I have to initialze "websockets"collection first ?

Code:
           getJedis().hset("websockets", sock.writeHandlerID(), payload.toString()); // all are strings.

Exception:

redis.clients.jedis.exceptions.JedisDataException: WRONGTYPE Operation against a key holding the wrong kind of value

[Marcos Lilljedahl]

Mudassir, seems like you already have a key that is called "websockets" which is not of hashmap type (maybe you're using it somewhere else). 

Try flushing your redis instance and trying again.

[Mudassir Maredia]

Marcos,

Yes, that was the problem. I flushed redis and it worked :) Thank You !!

-Mudassir.