Signal Method Concurrency

YASMOABD · November 24, 2023, 2:22pm

If I have a signal method in a workflow, and that signal method is called twice for the same executing workflow, will the 2nd call wait for the first signal method to finish, before starting execution, given that the signal method contains a long running code.

antonio.perez · November 24, 2023, 3:41pm

hi @YASMOABD

they can be processed concurrently, in different threads.

If you need to process the signals secuentially you can create a list where you add the signals

github.com

temporalio/samples-java/blob/4d6427dbd7bbc23e22cbf1bbcbcc04d3913c27e9/core/src/main/java/io/temporal/samples/hello/HelloSignal.java#L101


      
                  // no messages in queue and exit signal was sent, return the received messages
                  return receivedMessages;
                }
                String message = messageQueue.remove(0);
                receivedMessages.add(message);
              }
            }
          
            @Override
            public void waitForName(String name) {
              messageQueue.add("Hello " + name + "!");
            }
          
            @Override
            public void exit() {
              exit = true;
            }
          }
          
          /**
           * With the Workflow and Activities defined, we can now start execution. The main method starts

and process the signals one-by-one in your workflow code https://github.com/temporalio/samples-java/blob/4d6427dbd7bbc23e22cbf1bbcbcc04d3913c27e9/core/src/main/java/io/temporal/samples/hello/HelloSignal.java#L89

given that the signal method contains a long running code.

Does this involve executing activities or other operations, or is it just workflow code?

Antonio

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Signal Method Concurrency

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