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  1.  Home
  2. JAVA400-L
  3. April 2002

RE: Communication between JVM's

A wait queue could be an object that:
- has a maximum number of active threads (say 50)
- accepts an incomming/outgoing communication request,
 'translates' this request to a new Thread to be launched
- whenever the number of active threads < maximum
  the new thread is launched using a tcp/ip port
- whenever the number of active threads = maximum
  the new thread is added to a fifo-queue of objects
  until an active thread ends
- when each communication thread is terminating this
  is signalled to the queue resulting in starting
  a the first thread on the wait queue (if there's one)
...


p.s. isn't jdk1.4 already available as an PTF on the iSeries?

Geert

(I'm off for the weekend)

-----Original Message-----
From: Price, Chris [mailto:chris_price@nsb.co.uk]
Sent: vendredi 12 avril 2002 14:39
To: 'java400-l@midrange.com'
Subject: RE: Communication between JVM's


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Geert,

SocketChannel looks interesting, but it could be a long wait before JDK1.4
becomes available on the iSeries....(vbg)

What is a wait queue - do you know of any example / documentation anywhere.

I am concerned about response times - ideally the servlet that generates
message should wait for acknowledgement from the client that it has received
it before continuing, so a error page can be displayed if necessary.

I'm still in the early design stages, so any suggestion for better ways will
be welcomed.

Chris.

 -----Original Message-----
From:   Geert Van Landeghem [mailto:gvl@reynderseti.be]
Sent:   12 April 2002 15:24
To:     'java400-l@midrange.com'
Subject:        RE: Communication between JVM's

How long do you estimate the duration of the communication?
Have a look at the new Channel classes that allow non-blocking
input from files, sockets, ... perhaps this will benefit you.

I see no difference using sockets to communicate between
two JVM's either on different machines or on the same machine.

If you're afraid of to many socket communications and response time
is not a problem you could implement a wait queue which allows only
a maximum number of socket communications to be active.

Hope this helps.

Geert

-----Original Message-----
From: Price, Chris [mailto:chris_price@nsb.co.uk]
Sent: vendredi 12 avril 2002 14:08
To: 'java400-l@midrange.com'
Subject: RE: Communication between JVM's


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It's kind of a messaging system.

My WAS needs to sends messages to some clients, via a router. The router to
client part I'm happy to be socket based.

If the WAS & the router are running on different machines, then they will
have to use sockets to communicate. BUT if they are the same machine, will
it be inefficient to communicate via sockets?

I'm also nervous about large number of sockets being opened in the WAS, as
each one is going to tie-up a TCP/IP port for the duration of the
conversation.

Chris.

 -----Original Message-----
From:   Geert Van Landeghem [mailto:gvl@reynderseti.be]
Sent:   12 April 2002 15:01
To:     'java400-l@midrange.com'
Subject:        RE: Communication between JVM's

In my humble opinion, no. You could use File objects
on disk, an OODBMS, ... to share information. The most low
level communication is always done by using sockets.
What kind of application do you want to write?

Geert

-----Original Message-----
From: Price, Chris [mailto:chris_price@nsb.co.uk]
Sent: vendredi 12 avril 2002 13:51
To: 'java400-l@midrange.com'
Subject: RE: Communication between JVM's


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Are there no more efficient solutions than sockets (which all these
ultimately use)?

 -----Original Message-----
From:   Geert Van Landeghem [mailto:gvl@reynderseti.be]
Sent:   12 April 2002 14:45
To:     'java400-l@midrange.com'
Subject:        RE: Communication between JVM's

There are several possibilities using:
- sockets
- RMI or Remote Method Invocation (serialized objects over sockets)
- EJB (Application server) to clients
- Servlet/JSP (Application Server) to clients
...

Geert
-----Original Message-----
From: Price, Chris [mailto:chris_price@nsb.co.uk]
Sent: vendredi 12 avril 2002 13:25
To: 'java400-l@midrange.com'
Subject: Communication between JVM's


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All,

What is the best way of communicating between two different JVM's, running
on the same machine?


Chris.

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