Re: Call Java program from RPGLE

David
using TCP/IP sockets sounds intresting,
we have 2 system in production which use data queues,
rpg program writes data to outq, which java program
reads and then it responds to inq, which rpg is
listening,
but there is a draw back to this process, it can only
handle one request at a time, unless you use threads
in java to handle multiple request at a time,
i do not like to use it is a absolute must.

so i would like to know more about this tcp/ip
solution how does it work, does it have the same issue
as data queue, or it can handle multiple request
can you provide some pointers or place where i can get
some information with code sample
i m pretty comfortable with both the languages.

ashish
--- David Gibbs <david@xxxxxxxxxxxx> wrote:

Richard Schoen wrote:

We have a batch RPG job that calls a Java class

which interfaces into

our Enterprise Workflow web service and it seems

to work fine and it's

fast after initial startup.

It also depends on what kind of horsepower the
system your run it on has.

Of course, for a batch job it's not so much of a
issue ... as resources
are allocated to batch jobs differently than
interactive.

When I was initially playing with calling Java from
RPG, the bulk of the
invocations I was looking at were from interactive
jobs. I didn't want
to subject the user to the startup penalty. Plus,
every user would have
to have their own JVM instance ... chewing up system
resources.

We decided to go with a tcp/ip sockets
implementation that talks to our
java server. The java server receives & responds to
the requests. One
instance of the java application, very lightweight
native code
requirements.

The initial design was a bit involved (I was
learning both java and RPG
sockets at the same time), but we wrappered it quite
nicely (love love
love service programs). The server can run on the
System i or a PC (or
unix server).

We send a request from the RPG app to the java
server via tcp/ip ...
simple requests are answered directly on same
connection ... bulk data
requests are written out to specific database files
using jdbc.

Note: What I'm describing is different than the data
queue based
mechanism that I described earlier.

The only drawback is you need some familiarity

with Java, RPG and how

they work together :-)

Drawback? Ha! That's the advantage. Something new
to learn.

In todays world: You snooze you loose ... and that
goes double for the
technology world.

david

--
IBM System i - For when you can't afford to be out
of business

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