Questions Tagged With signals

Signal wildcards behave in an unexpected way

vagabond — Tue, 14 May 2019 10:30:00 -0400

Hi Axon.ivy Team,

I'm using Axon.ivy LTS 7.0.8 and I'm getting an issue related to Signal.

I have 4 signal receivers:

one
one:two
one:two:three
one:two:three:four

When I send the signal one:two:three:four, I expect that only the (4) receiver would be triggered. Unfortunately, I was surprised that all four of them were triggered.

According to the official document, I would expect that only if I use the wildcard in the pattern of the Receiver, I will have the same behaviours (one:*, one:two:*, one:two:three:*) but in this case, the wildcard does not matter much here.

Is it a bug or by design that the Signal Receivers behave like that?

Thanks! Jack

Task changes priority after SignalBoundary

SupportIvyTeam — Mon, 30 Jul 2018 09:10:02 -0400

I have a UserTask that can optionally be cancelled by firing a Signal. When the Signal is actually received the Task seems to change its Priority from HIGH to LOW. Why does that happen?

How to interact with fired signals in CaseMap

SupportIvyTeam — Fri, 03 Nov 2017 09:29:06 -0400

Extracted questions from another post by @trungdv

How to handle case that i have paralell tasks? Example: when employee just come to company, we need to do three things paralelly
In one process of a stage, if i want to break that process to smaller processes and connect them by signal (more flexible), the first mini process will send signal to second process and may be create new ivy task there. In business point of view, this process is completed when all mini processes are completed. Does CaseMap support for visualizing this case?

How to use SingalStart in CaseMap

trungdv — Tue, 31 Oct 2017 05:39:31 -0400

Hi ivyteam

I'm using ivy 7.0.1 and I have the process like this:

My project has two stage, First stage is Data Gathering, Second is Document. In each stage i have a ivy process (could be more in real case), and they are connected by signal (see on picture)

When first process is done, it send signal then second process is started and create task to responsible role, If that activator open task, process can continue with another signal to create another task and so on...

When i use ivy 7, i try with CaseMap, but i can not integrate those process to case map, because i see it only support for Start Process. In this picture i only can browse first startlink, not signal or second task switch.

My question is:

Can i apply CaseMap for my project (it use a lot of signal like this pattern)? Or we need to remove all signal and change to startlink? I see we no need to use signal and task switch. how to handle signal boundary event on startlink?
In case we only use startlink, how to secure them?

Thanks

How to set the data type for Ivy signal?

Nhan Nguyen — Thu, 14 Sep 2017 07:08:19 -0400

I am trying to pass some data into a process via Ivy signal. In the Inscribe Signal Start Event window, how can I specified the datatype (CustomClass instead of Data) in the output tab? Thank you everyone.

Sending Signals, how to define a Signal only once

Stefan13 — Wed, 14 Sep 2016 16:23:04 -0400

Hi,

When using signals, a signal is defined as a string, for example in a Signal Start Event. This string has to be coded at least twice, when you send a signal and when you receive a signal. This can produce a spelling mistake easily, for exmple, somebody sends xxx:awaiting_end_of_rejection_period:start, but the SignalStartEvent waits for xxx:await_end_of_rejection_period:start.

I would like to define all my signal strings in an interface like this in Java:

public interface SignalCodes { public static String INITIALIZE_REQUEST = "xxx:initialize_request:start"; public static String RECOGNIZE_BUSINESS_CASE = "xxx:recognize_business_case:start"; public static String IDENTIFY_REQUESTER = "xxx:identify_requester:start"; public static String CREATE_REQUEST_AND_REQUESTER = "xxx:create_request_and_requester:start"; public static String RATE_REQUEST = "xxx:rate_request:start"; public static String AWAIT_END_OF_REJECTION_PERIOD = "xxx:awaiting_end_of_rejection_period:start"; public static String REJECT_REQUEST = "xxx:reject_request:start"; public static String PEP_CHECK = "xxx:pep_check:start"; public static String MANUAL_HANDLING = "xxx:manual_handling:start"; public static String SEND_CONTRACT_DOCUMENTS = "xxx:send_contract_documents:start"; }

I can use thise definition when i send the signal programmatically, but i can't use it in the SignalStartEvent. There only a hard coded string ca be used.

Is there a solution for this problem? Define a signal string only once and then use ist on both sides, sender and receiver?

I think, the CMS should be the right place to define the signal strings.

How signal be handled in multiple PMV?

trungdv — Wed, 13 Jul 2016 11:45:13 -0400

Hi all

I'm a newbie on signal concept, so I don't know exactly how signal is triggered on multiple PMVs, my usecase is: In the PMV 1 of project A, I created a ivy task. Then some days later, I deploy version 2 or that project, I also create the same task on that version. I have a portal page where it load all task from all PMVs. so from here I can open the old task. I assume that in the implementation of task, when the task is open, it do some stuff then send the signal (code: ABC) to do any other stuffs. So what if I open the old task(on PMV 1) then when it send the signal ABC, is the signal triggered on the PMV 2 ?

Thanks

Issue with receiving and sending the same signal in a process

Lars Tuchel — Tue, 05 Jul 2016 14:08:11 -0400

Hi everyone

So I have a process with a User Task that has a signal boundary event that listens to a certain signal X. After the user task is finished I check some values and depending on that I want to send the same signal X. See the image below:

But when that signal is sent I get the following exception:

java.lang.IllegalStateException: State of Task must be one of the following values CREATED, RESUMED but is DESTROYED
  at ch.ivyteam.api.API.checkObjectState(API.java:323)
  at ch.ivyteam.ivy.workflow.internal.Task.end(Task.java:2642)
  at ch.ivyteam.ivy.workflow.internal.Task$49.execute(Task.java:2618)
  at ch.ivyteam.ivy.persistence.base.AbstractPersistencyService.execute(AbstractPersistencyService.java:176)
  at ch.ivyteam.ivy.persistence.base.AbstractPersistencyService.execute(AbstractPersistencyService.java:233)
  at ch.ivyteam.ivy.persistence.base.ClassPersistencyService.execute(ClassPersistencyService.java:660)
[...]

I uploaded a demo project here: https://drive.google.com/file/d/0B3V8Sh7Fl7FXR3dzMFhzVzJlTEk/view?usp=sharing

Thanks in advance

Is there any possible way to switch SYSTEM session to another regular user's session in a ProgramStart execution?

Genzer Hawker — Fri, 27 May 2016 07:54:55 -0400

In our project, we use ProgramStart to implement cron jobs. The executions will always be carried on by the SYSTEM user using only one ISession(id = 0).

The problem is, we heavily store plenty of Context Information (authentication token, user-session-specific data, etc) into ISession.setAttribute(). It works well on normal situation with logged-in Ivy user. However, because in background jobs, there is only one session, each execution will interfere with each others, trying to set and get the Context Information.

In addition, this happens the same with Signals since execution of those also delegated to SYSTEM.

I've tried to call ivy.session.login() but it threw exception since Axon.ivy refuse to allow logging out of SYSTEM user.

My question is: Is there any possible way to switch from SYSTEM sessions to regular normal user's session?

Thanks