[rules-users] Archived documentation for Drools 3?
Hi all, The Drools web site only has the docs/tutorials/etc for version 4 onwards. I am looking for archived documentation of Drools version 3.x.y (I am new to Drools and need to work on a legacy application written with that version). Does anyone happen to have it? Kind regards, Alexandros ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Uses of timer node
Are you running a thread that fires rules [ksession.fireUntilHalt();] as described in the link below? http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-flow/html/ch03.html#sec.timers Renato Herebia wrote: Hi! I'm testing the timer node and I did a simple flow with start node, action node (System.out.println(action node 1);), a timer node, other action node (System.out.println(action node 2);) and the end node. When the process start, the first action node is triggered, after that, the timer node is activated and don't pass for the next action node after the delay time programmed. Has any configuration to do when working with timer nodes (handlers, etc.)? Someone has a simple example like this I'm testing? Thanks! -- Renato Herebia ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Drools Flow, threads and persistence in a clustered environment
Hello, We plan to use Drools (Flow) in our application for managing long-running processes. High-availability is important to us and therefore we target a clustered JBoss environment with 3 nodes. We are looking for advice on how to approach this from a Drools perspective. Can anybody share their experiences on running Drools in a cluster? The following scenarios come to mind: 1) A singleton ksession runs constantly on one of the nodes and does all the work; it migrates when the node goes down to another machine. 2) Multiple ksession instances on different nodes (for distributing load); when one fails the other picks up its processes by having a second ksession instance created on it and resuming execution. Are there any wrapper/utility libraries for Drools that help in clustered environments? Thank you ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Latest Drools with Latest Eclipse
Depends which plugins you're referring to. JBoss Tools 3.0.x only supports Eclipse Ganymede (3.4.x series). Therefore, if you want to use JBoss Tools you can't use the latest Eclipse (3.5.x series) unless you settle for a development milestone version of JBoss Tools 3. Chris Richmond wrote: Is it possible to run all the latest Drools 5.1.0 with the latest version of Eclipse and the Elipse plugins, etc? Has anyone successfully done this? Also, I remember seeing a link to a testing framework within the IDE on the drools blog at some time, but cannot seem to locate it. Does anyone know what I am talking about and can provide the link? Thanks, Chris ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Drools Flow: waiting for process to complete without polling
Hello Kris,
Thank you for your reply.
I am currenty doing test-driven development outside an application
server to learn the API. I launch processes from within a unit test
method; hence my need to wait in this manner so that I can perform a
final assertion on process state (after the process is complete).
You are totally correct to point out that in real life, I will be
executing long-running processes from within JBoss in my application
across multiple executions of the application. So what is the typical
approach for doing that? Do you typically install Drools as a service in
a SAR, or do you launch it with a servlet startup listener when the WAR
starts? Also, how do you make sure a clean undeploy/shutdown occurs
where process execution is gracefully suspended and process states are
saved? Can you give me some pointers?
Thank you.
Kris Verlaenen wrote:
I'm not sure that having a thread wait like this until all processes
have completed is a good idea in general, as in theory processes could
run for a long time (hours/days/weeks/...). Unless of course you are
only using synchronous processes, but in that case the engine will only
return once the process has been completed anyway (if you call it
synchronously).
But the approach you suggest is valid, you can register an event
listener to react whenever a process instance is completed, or similarly
you could use the history log to retrieve this kind of information
(making it decoupled from the actual execution).
Kris
Quoting Alexandros Karypidis akary...@yahoo.gr:
Hello,
I'm not very experienced in the Drools Flow API so I'm looking into
the
best way to code a simple thing: wait for all processes in a session
to
complete without polling.
The only way I could thing of from the javadoc reference I read, is
to
synchronize and do a wait()/notify() using a ProcessEventListener. It
seems a lot of work for a use-case that is too basic. I set up a
listener like this:
pel = new ProcessEventListener() {
// ...
public void afterProcessCompleted(ProcessCompletedEvent
pce) {
synchronized (this) {
notifyAll();
}
}
}
ksession.addEventListener(pel);
...then wait for processes (one in this simplified case) to complete
like this:
synchronized (pel) {
new Thread(new Runnable() {
public void run() {
ksession.fireUntilHalt();
}
}).start();
ksession.startProcess(some.process);
pel.wait(); // the notifyAll() resumes this
}
Is there a better way to do this?
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[rules-users] Drools Flow: waiting for process to complete without polling
Hello,
I'm not very experienced in the Drools Flow API so I'm looking into the
best way to code a simple thing: wait for all processes in a session to
complete without polling.
The only way I could thing of from the javadoc reference I read, is to
synchronize and do a wait()/notify() using a ProcessEventListener. It
seems a lot of work for a use-case that is too basic. I set up a
listener like this:
pel = new ProcessEventListener() {
// ...
public void afterProcessCompleted(ProcessCompletedEvent pce) {
synchronized (this) {
notifyAll();
}
}
}
ksession.addEventListener(pel);
...then wait for processes (one in this simplified case) to complete
like this:
synchronized (pel) {
new Thread(new Runnable() {
public void run() {
ksession.fireUntilHalt();
}
}).start();
ksession.startProcess(some.process);
pel.wait(); // the notifyAll() resumes this
}
Is there a better way to do this?
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