topic Is it safe to keep state in Java delegates? in Alfresco Archive https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152109#M106786 <HTML><HEAD></HEAD><BODY><SPAN>I have a use case where I need to reaccess an expression when signaling out of a delegate. Since the signal method does not have the ActivityExecution instance to get the values of an expression, I am thinking of setting the values in a member variable and access it when signaling. Something like:</SPAN><BR /><BR /><SPAN>public class MyTaskDelegate extends BaseTaskDelegate {</SPAN><BR /><BR /><SPAN>&nbsp; private Logger logger = LoggerFactory.getLogger(SymphonyTaskDelegate.class);</SPAN><BR /><SPAN>&nbsp; private Expression inVariables;</SPAN><BR /><SPAN>&nbsp; private Expression outVariables;</SPAN><BR /><SPAN>&nbsp; private String outVariablesStr;</SPAN><BR /><BR /><SPAN>public void execute(ActivityExecution execution) throws Exception {</SPAN><BR /><SPAN>&nbsp; /*Do something*/</SPAN><BR /><SPAN>&nbsp; outVariablesStr = outVariables..getValue(execution);</SPAN><BR /><SPAN>}</SPAN><BR /><BR /><SPAN>public void signal(ActivityExecution execution, String signalName, Object signalData)</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throws Exception {</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp; /*READ outVariablesStr*/</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp; if (outVariablesStr != null) {</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /*Do Something*/</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp; }</SPAN><BR /><SPAN>&nbsp;&nbsp;&nbsp; leave(execution);</SPAN><BR /><SPAN>&nbsp; }</SPAN><BR /><SPAN>}</SPAN><BR /><BR /><SPAN>Is this doable? Can I rely on the delegate state being saved, even if say, I restart the activiti server after execute and before signal?</SPAN></BODY></HTML> Wed, 25 Sep 2013 23:05:03 GMT jorell 2013-09-25T23:05:03Z Is it safe to keep state in Java delegates? https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152109#M106786 I have a use case where I need to reaccess an expression when signaling out of a delegate. Since the signal method does not have the ActivityExecution instance to get the values of an expression, I am thinking of setting the values in a member variable and access it when signaling. Something like<IMG id="smileytongue" class="emoticon emoticon-smileytongue" src="https://migration33.stage.lithium.com/i/smilies/16x16_smiley-tongue.png" alt="Smiley Tongue" title="Smiley Tongue" />u Wed, 25 Sep 2013 23:05:03 GMT https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152109#M106786 jorell 2013-09-25T23:05:03Z Re: Is it safe to keep state in Java delegates? https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152110#M106787 <HTML><HEAD></HEAD><BODY><SPAN>Actually signal does have access to the ActivityExecution instance, my usecase is to call a different method before signalling. This method needs to access 'outVariablesStr' in the above code.</SPAN></BODY></HTML> Wed, 25 Sep 2013 23:55:50 GMT https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152110#M106787 jorell 2013-09-25T23:55:50Z Re: Is it safe to keep state in Java delegates? https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152111#M106788 <HTML><HEAD></HEAD><BODY><SPAN>No: java delegates are statesless. That is the reason why we only allow for expressions: the expression *definition* is injected in the delegate, and evaluated at runtime. </SPAN><BR /><BR /><SPAN>If you inject a String into a delegate, it will be widely know to all delegates (because there is only one)</SPAN></BODY></HTML> Mon, 30 Sep 2013 06:24:11 GMT https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152111#M106788 jbarrez 2013-09-30T06:24:11Z Re: Is it safe to keep state in Java delegates? https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152112#M106789 <HTML><HEAD></HEAD><BODY><SPAN>Got it. Thanks.</SPAN></BODY></HTML> Mon, 30 Sep 2013 23:22:19 GMT https://connect.hyland.com/t5/alfresco-archive/is-it-safe-to-keep-state-in-java-delegates/m-p/152112#M106789 jorell 2013-09-30T23:22:19Z