Re: [nodejs] How To get session of java

[Ben Noordhuis]

On Wed, Dec 12, 2012 at 8:39 AM, ayaz ali <khatri....@gmail.com> wrote:
> hello everyone i have made a nodejs chat app with express and io. i want to
> integrate it with existing java application which is mode on java spring.
> flow will be like that when user login the application i want to get the
> session of java in my nodejs to get user online.

Define 'session'? If you mean the server-side state that the
JSESSIONID cookie refers to, you'll have to devise some RPC protocol
between Spring and node.js for getting that state out of your servlet
container.

[Angel Java Lopez]

Hi people!

Ummmm.. do you need somevalue of session? or only the name of the user, to be used at the chat activitiy?

In any case, I would implement:

- Java (web server, I guess) sends a token to browser. In this context, token is a random key (a GUID, maybe). Java web server keeps a weak dictionary (or something more elaborated, with time expiration) that associate key with the data you want to keep track.

- Web browser send the token to node, in a Socket.IO message

- Node save the token in the client socket object, if you need it more than one time

- Node call a simplre REST service at Java web server, sending the receiving context. If you need more that one data piece, maybe you can send an additional parameter like "email", or "firstName", specifying what you want to get.

- Java web server query the weak dictionary using the token as key, retrieving the required data, and sending it in the response

- You can add security measures to keep the REST service only accesible from your Nodejs machine

- A weak dictionary prevents Java application to hold for ever the data

Another approach:

- Java server sends the token to the web browser

- Java server call a REST service AT NODE JS server, sending the token, and the data you will be use at chat flow (that is, in the case the data you need is known in advance, and you don't need to send data from Node.js to Java)

- Node.js save the info in a dictionary (a simple javascrip object)

- Web browser send the token to node.js/socket.io during chat activity

- Node.js retrieved the rest of the data using the dictionary

- You must provide something to prune the dictionary (every token/key could have a "limit life" of 10 minutes, or delete the key if it is not used after X minutes)

Using the token, no sensible information is send to the browser. Having a random token, prevents cheating from a client.

You could use session.getId() as the key

Instead of calling node.js from java server using a REST service (or something alike) you could try an RPC, like dnode https://github.com/substack/dnode

Angel "Java" Lopez

@ajlopez

gh:ajlopez

On Wed, Dec 12, 2012 at 4:39 AM, ayaz ali <khatri....@gmail.com> wrote:

hello everyone i have made a nodejs chat app with express and io. i want to integrate it with existing java application which is mode on java spring. 

flow will be like that when user login the application i want to get the session of java in my nodejs to get user online.

Thanks 

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[ayaz ali]

i need the complete session object which is created after login. it may contain any thing any solution please

[greelgorke]

it depends on how java session is implemented. is it persisted in a db? then you just have to read the session-id cookie in node and fetch it from db. if its in-memory stored in java, then you have to implement a rpc/rest interface in java, which profides the session data as json to your node application. if it's pure cookie/localstorage based, thans just read them.

[ayaz ali]

its an httpsession

[Angel Java Lopez]

Umm... then, you could serialize the session to JSON, if the objects are suitable for that serialization.

Distributed session using memcached uses that approach

http://code.google.com/p/memcached-session-manager/wiki/SerializationStrategies

I don't know the "state of art" in Java to JSON serialization. Some resources

http://www.javaplex.com/blog/java-json-libraries-for-serialization-deserialization-of-java-objects/

On Wed, Dec 12, 2012 at 6:13 AM, ayaz ali <khatri....@gmail.com> wrote:

its an httpsession

[ayaz ali]

is it possibe to acess session from javascript? hop eits silly questuin :p bt just for confirmation

[Ben Noordhuis]

On Wed, Dec 12, 2012 at 10:21 AM, ayaz ali <khatri....@gmail.com> wrote:
> is it possibe to acess session from javascript? hop eits silly questuin :p
> bt just for confirmation

What exactly is unclear? It's been spelled out for you several times now.

[ayaz ali]

[Angel Java Lopez]

I'm not sure what is your use case.

If you need some value at client side/javascript, and you are using JavaServerPages (JSP), you could try (quick and dirty):

<script>

var myclientsidevalue = '<%= session.getValue("myserversidename") %>'; // I don't remember the exact notation, method call, etc..

</script>

there are other "better" solution (using expression language instead of <%= %>.

But really, I didn't grasp your use case, and real/final problem to solve. And below question is out of topic in this list, I guess.

On Wed, Dec 12, 2012 at 10:23 AM, ayaz ali <khatri....@gmail.com> wrote:

is it possibe to acess session from javascript?

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