topic Re: Accessing Process Variable in external Groovy Script launched from Java Service Task in Alfresco Archive

Accessing Process Variable in external Groovy Script launched from Java Service Task

sankarts — Tue, 13 Jan 2015 12:18:30 GMT

My requirement is to launch external Groovy script from Java Service Task (which implements JavaDelegate).In the Groovy script, I need to access the "Process Variable" through Execution Context i.e. DelegateExecution. def myArray = [] as ArrayList myArray = (ArrayList)execution.getVariable

Re: Accessing Process Variable in external Groovy Script launched from Java Service Task

sankarts — Wed, 14 Jan 2015 04:57:29 GMT

Any inputs / comments on this please?

Re: Accessing Process Variable in external Groovy Script launched from Java Service Task

martin_grofcik — Wed, 14 Jan 2015 11:11:22 GMT

Hi,
I would prefer to pass variable values to the external script as an arguments.

Regards
Martin

Re: Accessing Process Variable in external Groovy Script launched from Java Service Task

sankarts — Wed, 14 Jan 2015 13:33:11 GMT

Martin,

Thanks for the response.

I do understand passing the variable as argument is the preferred option.

<java>
public class AutoRouteSelection implements JavaDelegate {
….
public void execute(DelegateExecution execution) throws Exception {
            GroovyScriptEngine gse = new GroovyScriptEngine( "." );
     Binding binding = new Binding();
     binding.setVariable("delegateExec", execution);
     gse.run(strGroovyScriptName, binding);
        }
}
</java>

The catch is that how to access "DelegateExecution execution" in Groovy script, which is passed as argument from Java Service Task.

Re: Accessing Process Variable in external Groovy Script launched from Java Service Task

jbarrez — Fri, 16 Jan 2015 15:36:34 GMT

What's wrong with using the script task? Which can be used with Groovy and where the binding is already implemented by us?

Re: Accessing Process Variable in external Groovy Script launched from Java Service Task

sankarts — Mon, 19 Jan 2015 10:12:45 GMT

The Script Task works fine with accessing the process variables.

If Groovy Script involves complex logic, it is better to keep it as external file, rather than inline within the BPMN spec.

PLease refer
<bbcode>
http://forums.activiti.org/content/script-task-using-external-files-source
</bbcode>

and
<bbcode>
http://jira.codehaus.org/browse/ACT-2178
</bbcode>

In this backdrop, how can I pass "DelegateExecution execution", so as to access Process Varibales from external Groovy Script launched from "Service Task"? Thanks.

Re: Accessing Process Variable in external Groovy Script launched from Java Service Task

sankarts — Wed, 21 Jan 2015 06:14:45 GMT

Joram,

Objective: To access Process variables in external Groovy Script file

Can you comment on how we can pass "DelegateExecution execution" context so as to access Process Variables from external Groovy Script? Thanks.

Re: Accessing Process Variable in external Groovy Script launched from Java Service Task

jbarrez — Wed, 21 Jan 2015 13:52:55 GMT

In m opinion, it would be better to expand the ScriptTask to be able to use external files. That way other people who have the same use case would benefit from the effort.

>In this backdrop, how can I pass "DelegateExecution execution", so as to access Process Varibales from external Groovy Script launched from "Service Task"? Thanks.

You would need to create Bindings, like we do : https://github.com/Activiti/Activiti/blob/master/modules/activiti-engine/src/main/java/org/activiti/engine/impl/scripting/ScriptBindings.java