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Allowing expressions in properties of CustomServiceTask

f3lix

Hello,

I followed the user guide and successfully added and entry to the designer's palette by extending AbstractCustomServiceTask and adding the appropiate annotations.

If i have a text property like this:

@Property(type = PropertyType.TEXT, displayName = "Service endpoint URL")
private String endpointURL;
‍‍‍‍

the user can enter text for the field endpointURL, but I also want to allow expressions for this field. How can I do this?

Or put it another way: currently the generated BPMN2 XML will look like this:

   <activiti:field name="endpointURL">
          <activiti:string>${endpointUrl}</activiti:string>
    </activiti:field>
‍‍‍‍‍

How do I get the following (with AbstractCustomServiceTask 😞

   <activiti:field name="endpointURL">
          <activiti:expression>${endpointUrl}</activiti:expression>
    </activiti:field>
‍‍‍‍‍

Regards,
Felix

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Comments

tiesebarrell

Good point. This is something we should support. As a start we could detect whether you entered a string that is probably meant as an expression and generate the other item instead - I'm not sure whether we can effectively catch other scenarios with mixed strings like "ms ${piggy} went to town". One thing I'll need to check is whether the injection in the runtime class needs adjustment or not. Can you please create a Jira issue that references this thread and assign it to me (Tiese Barrell)? Then I'll make sure it makes its way into Designer. Thanks.

f3lix

Thanks for your fast response.

I created a ticket (http://jira.codehaus.org/browse/ACT-877) but could not assign it to you.

Felix

tiesebarrell

Great, thanks. I forgot you can't assign it directly. I claimed the issue.

f3lix

For now I created a workaround by evaluating the expression within the JavaDelegate, so <activiti:string> will also be evaluated as expression.

<br>public class QueryDelegate implements JavaDelegate<br><br> Expression query;<br> Expression endpointURL;<br><br> @Override<br> public void execute (DelegateExecution execution) throws Exception<br> {<br>&nbsp; ExpressionFactory ef = new ExpressionFactoryImpl ();<br>&nbsp; ELContext context = new ActivitiElContext (new VariableScopeElResolver (execution));<br>&nbsp; <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // instead of: String queryString = (String)query.getValue (execution); <br>&nbsp; ValueExpression ex = ef.createValueExpression (context, query.getExpressionText (), String.class);<br>&nbsp; String queryString = (String) ex.getValue (context); <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // instead of: String endpointUrlString = (String)endpointURL.getValue(execution);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>&nbsp; ex = ef.createValueExpression (context, endpointURL.getExpressionText (), String.class);<br>&nbsp; String endpointUrlString = (String) ex.getValue (context); <br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; … <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>}<br>

I am not sure if this will break something, but it seems to work …

Regards,
Felix