https://answers.axonivy.com/questions/2228/joining-two-signal<p>Hi all</p> <p>I have a requirement as below: <img alt="alt text" src="http://answers.axonivy.com/upfiles/Untitled_850woR8.png"></p> <p>In here i have two process which send two different signals, When one signal has been started, it will wait (by a system task) until the other signal also be started then two signal will join to do another logic. Signal 1 and Signal 2 can be started randomly. If i implement like above picture, the system task will not join to continue when two signals has started already, i guess it's because of there is two different cases. Am i correct?</p> <p>Another approach could be using a boundary signal event. </p> <p>But is there any other approaches which is better than it on ivy? i see in ivy we also has other elements like <em>wait</em>, <em>Call &amp; Wait</em>,... Can i apply it for this requirement.</p> <p>Thanks a lot</p>enThu, 22 Mar 2018 10:26:51 -0400https://answers.axonivy.com/questions/2228/joining-two-signal/3141<p>You can do this in pure java with a <a href="https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CountDownLatch.html">CountDownLatch</a>. Inside the "join tasks" script you a Java class with a static method that does the countDown and await. If you want it per user id, have a map of CounDownLatches.</p>adamfThu, 22 Mar 2018 10:26:51 -0400https://answers.axonivy.com/questions/2228/joining-two-signal/3141https://answers.axonivy.com/questions/2228/joining-two-signal/2239<p>There is no solution out of the box yet. So you have to solve it by yourself. One solution could be to work with a joinging-key. Every Case which has to be finished before a “Process X” can be started is tagged with this joining key. So the “Process X“ can check if there exists running cases with this “joining-key” and will not start until there exists none. The ‘joining-key’ can be created by the initial signal, which creates the parallel cases or has to depend on this case, so that every signaled process use the same 'joining-key'.</p> <p>The below example illustrates this use case. </p> <p><img alt="Join Signals with a joining-key" src="http://answers.axonivy.com/upfiles/JoiningSignals.PNG"></p> <p>I will come back to this question on monday with some further details. And hopefully there is a easier solution to solve such use cases. But to be honest, I think this is a miss usage of signals...</p>Flavio SadeghiThu, 01 Dec 2016 16:17:54 -0500https://answers.axonivy.com/questions/2228/joining-two-signal/2239