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en:rule:event_gateway_warning [2023-09-10 12:35] – [Use the event gateway with caution] Anatoly Belaychuken:rule:event_gateway_warning [2024-08-24 15:49] (current) – [Use event gateways with caution] Anatoly Belaychuk
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-====== Use the event gateway with caution ======+====== Use event gateways with caution ======
  
-{{tag>subprocess gateway event}}+{{tag>gateway parallel_gateway event_gateway}}
  
-{{en:underconstruction.png?nolink&200|}}+Event gateway immediately interrupts all catching events when any single one occurs. 
 +For more versatile logic consider the combination of parallel gateway and terminating event.
  
-Utilizing exclusive event-based gateway is a rather common mistake. What's missed in the diagram below is that the payment may arrive while we are discussing the issue with the client. If this happens, the message won't be catched and the process will hang on the gateway. 
 ===== ✔ How to ===== ===== ✔ How to =====
  
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 <definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="sid-38422fae-e03e-43a3-bef4-bd33b32041b2" targetNamespace="http://bpmn.io/bpmn" exporter="http://bpmn.io" exporterVersion="0.10.1"> <definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="sid-38422fae-e03e-43a3-bef4-bd33b32041b2" targetNamespace="http://bpmn.io/bpmn" exporter="http://bpmn.io" exporterVersion="0.10.1">
   <process id="Process_0kf0077">   <process id="Process_0kf0077">
-    <subProcess id="Activity_1tn5n73"> +    <startEvent id="Event_13ec10q"> 
-      <startEvent id="Event_13ec10q"> +      <outgoing>Flow_1v91670</outgoing> 
-        <outgoing>Flow_0c37d4z</outgoing> +    </startEvent> 
-      </startEvent> +    <parallelGateway id="Gateway_08peucq"> 
-      <sequenceFlow id="Flow_0c37d4z" sourceRef="Event_13ec10q" targetRef="Gateway_08peucq" /> +      <incoming>Flow_1v91670</incoming> 
-      <parallelGateway id="Gateway_08peucq"> +      <outgoing>Flow_1bmuvfd</outgoing> 
-        <incoming>Flow_0c37d4z</incoming> +      <outgoing>Flow_1omf6ox</outgoing> 
-        <outgoing>Flow_05uwose</outgoing> +    </parallelGateway> 
-        <outgoing>Flow_1yoh8c2</outgoing> +    <endEvent id="Event_1k1tn88" name="Paid"> 
-      </parallelGateway> +      <incoming>Flow_1x386gx</incoming> 
-      <task id="Activity_1mnvjuz" name="Obtain payment"> +      <terminateEventDefinition id="TerminateEventDefinition_0ku242o" /> 
-        <incoming>Flow_05uwose</incoming> +    </endEvent> 
-        <outgoing>Flow_0xinlw8</outgoing> +    <sequenceFlow id="Flow_1v91670" sourceRef="Event_13ec10q" targetRef="Gateway_08peucq" /> 
-      </task> +    <sequenceFlow id="Flow_1bmuvfd" sourceRef="Gateway_08peucq" targetRef="Event_1hlib99" /> 
-      <sequenceFlow id="Flow_05uwose" sourceRef="Gateway_08peucq" targetRef="Activity_1mnvjuz" /> +    <intermediateCatchEvent id="Event_0r0tew3" name="Payment due date"> 
-      <intermediateCatchEvent id="Event_0r0tew3" name="Payment due date"> +      <incoming>Flow_0tjh6sh</incoming> 
-        <incoming>Flow_0tjh6sh</incoming> +      <outgoing>Flow_0vj1spf</outgoing> 
-        <outgoing>Flow_0vj1spf</outgoing> +      <timerEventDefinition id="TimerEventDefinition_1a77cp0" /> 
-        <timerEventDefinition id="TimerEventDefinition_1a77cp0" /> +    </intermediateCatchEvent> 
-      </intermediateCatchEvent> +    <exclusiveGateway id="Gateway_1jxup79"> 
-      <exclusiveGateway id="Gateway_1jxup79"> +      <incoming>Flow_1fpmuu7</incoming> 
-        <incoming>Flow_1yoh8c2</incoming> +      <incoming>Flow_1omf6ox</incoming> 
-        <incoming>Flow_1fpmuu7</incoming> +      <outgoing>Flow_0tjh6sh</outgoing> 
-        <outgoing>Flow_0tjh6sh</outgoing> +    </exclusiveGateway> 
-      </exclusiveGateway> +    <task id="Activity_12mr8cn" name="Clarify delay with the client"> 
-      <sequenceFlow id="Flow_1yoh8c2" sourceRef="Gateway_08peucq" targetRef="Gateway_1jxup79" /> +      <incoming>Flow_0vj1spf</incoming> 
-      <sequenceFlow id="Flow_0tjh6sh" sourceRef="Gateway_1jxup79" targetRef="Event_0r0tew3" /> +      <outgoing>Flow_0v7giyt</outgoing> 
-      <sequenceFlow id="Flow_0xinlw8" sourceRef="Activity_1mnvjuz" targetRef="Event_1k1tn88" /> +    </task> 
-      <endEvent id="Event_1k1tn88" name="Paid"> +    <exclusiveGateway id="Gateway_0gfb7mo" name="Wait more?"> 
-        <incoming>Flow_0xinlw8</incoming> +      <incoming>Flow_0v7giyt</incoming> 
-        <terminateEventDefinition id="TerminateEventDefinition_0ku242o" /> +      <outgoing>Flow_0xssdyb</outgoing> 
-      </endEvent> +      <outgoing>Flow_1fpmuu7</outgoing> 
-      <task id="Activity_12mr8cn" name="Clarify delay with the client"> +    </exclusiveGateway> 
-        <incoming>Flow_0vj1spf</incoming> +    <endEvent id="Event_04k06ga" name="Not paid"> 
-        <outgoing>Flow_0v7giyt</outgoing> +      <incoming>Flow_0xssdyb</incoming> 
-      </task> +      <terminateEventDefinition id="TerminateEventDefinition_0jd5cs4" /> 
-      <sequenceFlow id="Flow_0vj1spf" sourceRef="Event_0r0tew3" targetRef="Activity_12mr8cn" /> +    </endEvent> 
-      <exclusiveGateway id="Gateway_0gfb7mo" name="Wait more?"> +    <sequenceFlow id="Flow_0tjh6sh" sourceRef="Gateway_1jxup79" targetRef="Event_0r0tew3" /> 
-        <incoming>Flow_0v7giyt</incoming> +    <sequenceFlow id="Flow_0vj1spf" sourceRef="Event_0r0tew3" targetRef="Activity_12mr8cn" /> 
-        <outgoing>Flow_0xssdyb</outgoing> +    <sequenceFlow id="Flow_1fpmuu7" name="yes" sourceRef="Gateway_0gfb7mo" targetRef="Gateway_1jxup79" /> 
-        <outgoing>Flow_1fpmuu7</outgoing> +    <sequenceFlow id="Flow_0v7giyt" sourceRef="Activity_12mr8cn" targetRef="Gateway_0gfb7mo" /> 
-      </exclusiveGateway> +    <sequenceFlow id="Flow_0xssdyb" name="no" sourceRef="Gateway_0gfb7mo" targetRef="Event_04k06ga" /> 
-      <sequenceFlow id="Flow_0v7giyt" sourceRef="Activity_12mr8cn" targetRef="Gateway_0gfb7mo" /> +    <sequenceFlow id="Flow_1omf6ox" sourceRef="Gateway_08peucq" targetRef="Gateway_1jxup79" /> 
-      <sequenceFlow id="Flow_0xssdyb" name="no" sourceRef="Gateway_0gfb7mo" targetRef="Event_04k06ga" /> +    <intermediateCatchEvent id="Event_1hlib99" name="Payment obtained"> 
-      <sequenceFlow id="Flow_1fpmuu7" name="yes" sourceRef="Gateway_0gfb7mo" targetRef="Gateway_1jxup79" /> +      <incoming>Flow_1bmuvfd</incoming> 
-      <endEvent id="Event_04k06ga" name="Not paid"> +      <outgoing>Flow_1x386gx</outgoing> 
-        <incoming>Flow_0xssdyb</incoming> +      <messageEventDefinition id="MessageEventDefinition_0gm96fa" /> 
-        <terminateEventDefinition id="TerminateEventDefinition_0jd5cs4" /> +    </intermediateCatchEvent> 
-      </endEvent> +    <sequenceFlow id="Flow_1x386gx" sourceRef="Event_1hlib99" targetRef="Event_1k1tn88" />
-    </subProcess>+
   </process>   </process>
   <bpmndi:BPMNDiagram id="BpmnDiagram_1">   <bpmndi:BPMNDiagram id="BpmnDiagram_1">
     <bpmndi:BPMNPlane id="BpmnPlane_1" bpmnElement="Process_0kf0077">     <bpmndi:BPMNPlane id="BpmnPlane_1" bpmnElement="Process_0kf0077">
-      <bpmndi:BPMNShape id="Activity_1tn5n73_di" bpmnElement="Activity_1tn5n73" isExpanded="true"> 
-        <omgdc:Bounds x="290" y="-620" width="640" height="330" /> 
-      </bpmndi:BPMNShape> 
       <bpmndi:BPMNShape id="Event_13ec10q_di" bpmnElement="Event_13ec10q">       <bpmndi:BPMNShape id="Event_13ec10q_di" bpmnElement="Event_13ec10q">
-        <omgdc:Bounds x="332" y="-388" width="36" height="36" />+        <omgdc:Bounds x="302" y="-178" width="36" height="36" />
       </bpmndi:BPMNShape>       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="Gateway_1ay1ssw_di" bpmnElement="Gateway_08peucq">       <bpmndi:BPMNShape id="Gateway_1ay1ssw_di" bpmnElement="Gateway_08peucq">
-        <omgdc:Bounds x="405" y="-395" width="50" height="50" /> +        <omgdc:Bounds x="375" y="-185" width="50" height="50" />
-      </bpmndi:BPMNShape> +
-      <bpmndi:BPMNShape id="Activity_1mnvjuz_di" bpmnElement="Activity_1mnvjuz"> +
-        <omgdc:Bounds x="490" y="-410" width="100" height="80" /> +
-        <bpmndi:BPMNLabel /> +
-      </bpmndi:BPMNShape> +
-      <bpmndi:BPMNShape id="Gateway_1jxup79_di" bpmnElement="Gateway_1jxup79" isMarkerVisible="true"> +
-        <omgdc:Bounds x="405" y="-505" width="50" height="50" />+
       </bpmndi:BPMNShape>       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="Event_1f2yzhy_di" bpmnElement="Event_0r0tew3">       <bpmndi:BPMNShape id="Event_1f2yzhy_di" bpmnElement="Event_0r0tew3">
-        <omgdc:Bounds x="522" y="-498" width="36" height="36" />+        <omgdc:Bounds x="492" y="-298" width="36" height="36" />
         <bpmndi:BPMNLabel>         <bpmndi:BPMNLabel>
-          <omgdc:Bounds x="495" y="-455" width="90" height="14" />+          <omgdc:Bounds x="465" y="-255" width="90" height="14" />
         </bpmndi:BPMNLabel>         </bpmndi:BPMNLabel>
 +      </bpmndi:BPMNShape>
 +      <bpmndi:BPMNShape id="Gateway_1jxup79_di" bpmnElement="Gateway_1jxup79" isMarkerVisible="true">
 +        <omgdc:Bounds x="375" y="-305" width="50" height="50" />
       </bpmndi:BPMNShape>       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="Activity_12mr8cn_di" bpmnElement="Activity_12mr8cn">       <bpmndi:BPMNShape id="Activity_12mr8cn_di" bpmnElement="Activity_12mr8cn">
-        <omgdc:Bounds x="620" y="-520" width="100" height="80" />+        <omgdc:Bounds x="590" y="-320" width="100" height="80" />
         <bpmndi:BPMNLabel />         <bpmndi:BPMNLabel />
       </bpmndi:BPMNShape>       </bpmndi:BPMNShape>
-      <bpmndi:BPMNShape id="Event_0s7eoii_di" bpmnElement="Event_1k1tn88"> +      <bpmndi:BPMNShape id="Gateway_0gfb7mo_di" bpmnElement="Gateway_0gfb7mo" isMarkerVisible="true"> 
-        <omgdc:Bounds x="652" y="-388" width="36" height="36" />+        <omgdc:Bounds x="735" y="-305" width="50" height="50" />
         <bpmndi:BPMNLabel>         <bpmndi:BPMNLabel>
-          <omgdc:Bounds x="659" y="-345" width="23" height="14" />+          <omgdc:Bounds x="732" y="-248" width="56" height="14" />
         </bpmndi:BPMNLabel>         </bpmndi:BPMNLabel>
       </bpmndi:BPMNShape>       </bpmndi:BPMNShape>
-      <bpmndi:BPMNShape id="Gateway_0gfb7mo_di" bpmnElement="Gateway_0gfb7mo" isMarkerVisible="true"> +      <bpmndi:BPMNShape id="Event_1kp0poi_di" bpmnElement="Event_04k06ga"> 
-        <omgdc:Bounds x="765" y="-505" width="50" height="50" />+        <omgdc:Bounds x="822" y="-298" width="36" height="36" />
         <bpmndi:BPMNLabel>         <bpmndi:BPMNLabel>
-          <omgdc:Bounds x="762" y="-448" width="56" height="14" />+          <omgdc:Bounds x="819" y="-255" width="42" height="14" />
         </bpmndi:BPMNLabel>         </bpmndi:BPMNLabel>
       </bpmndi:BPMNShape>       </bpmndi:BPMNShape>
-      <bpmndi:BPMNShape id="Event_1kp0poi_di" bpmnElement="Event_04k06ga"> +      <bpmndi:BPMNShape id="Event_07hur9k_di" bpmnElement="Event_1hlib99"> 
-        <omgdc:Bounds x="852" y="-498" width="36" height="36" />+        <omgdc:Bounds x="492" y="-178" width="36" height="36" />
         <bpmndi:BPMNLabel>         <bpmndi:BPMNLabel>
-          <omgdc:Bounds x="849" y="-455" width="42" height="14" />+          <omgdc:Bounds x="466" y="-135" width="89" height="14" />
         </bpmndi:BPMNLabel>         </bpmndi:BPMNLabel>
       </bpmndi:BPMNShape>       </bpmndi:BPMNShape>
-      <bpmndi:BPMNEdge id="Flow_0c37d4z_di" bpmnElement="Flow_0c37d4z"> +      <bpmndi:BPMNShape id="Event_0s7eoii_di" bpmnElement="Event_1k1tn88"> 
-        <omgdi:waypoint x="368" y="-370" /> +        <omgdc:Bounds x="622" y="-178" width="36" height="36" /> 
-        <omgdi:waypoint x="405" y="-370" />+        <bpmndi:BPMNLabel> 
 +          <omgdc:Bounds x="629" y="-135" width="23" height="14" /> 
 +        </bpmndi:BPMNLabel> 
 +      </bpmndi:BPMNShape> 
 +      <bpmndi:BPMNEdge id="Flow_1v91670_di" bpmnElement="Flow_1v91670"> 
 +        <omgdi:waypoint x="338" y="-160" /> 
 +        <omgdi:waypoint x="375" y="-160" />
       </bpmndi:BPMNEdge>       </bpmndi:BPMNEdge>
-      <bpmndi:BPMNEdge id="Flow_05uwose_di" bpmnElement="Flow_05uwose"> +      <bpmndi:BPMNEdge id="Flow_1bmuvfd_di" bpmnElement="Flow_1bmuvfd"> 
-        <omgdi:waypoint x="455" y="-370" /> +        <omgdi:waypoint x="425" y="-160" /> 
-        <omgdi:waypoint x="490" y="-370" /> +        <omgdi:waypoint x="492" y="-160" />
-      </bpmndi:BPMNEdge> +
-      <bpmndi:BPMNEdge id="Flow_1yoh8c2_di" bpmnElement="Flow_1yoh8c2"> +
-        <omgdi:waypoint x="430" y="-395" /> +
-        <omgdi:waypoint x="430" y="-455" />+
       </bpmndi:BPMNEdge>       </bpmndi:BPMNEdge>
       <bpmndi:BPMNEdge id="Flow_0tjh6sh_di" bpmnElement="Flow_0tjh6sh">       <bpmndi:BPMNEdge id="Flow_0tjh6sh_di" bpmnElement="Flow_0tjh6sh">
-        <omgdi:waypoint x="455" y="-480" /> +        <omgdi:waypoint x="425" y="-280" /> 
-        <omgdi:waypoint x="522" y="-480" /> +        <omgdi:waypoint x="492" y="-280" />
-      </bpmndi:BPMNEdge> +
-      <bpmndi:BPMNEdge id="Flow_0xinlw8_di" bpmnElement="Flow_0xinlw8"> +
-        <omgdi:waypoint x="590" y="-370" /> +
-        <omgdi:waypoint x="652" y="-370" />+
       </bpmndi:BPMNEdge>       </bpmndi:BPMNEdge>
       <bpmndi:BPMNEdge id="Flow_0vj1spf_di" bpmnElement="Flow_0vj1spf">       <bpmndi:BPMNEdge id="Flow_0vj1spf_di" bpmnElement="Flow_0vj1spf">
-        <omgdi:waypoint x="558" y="-480" /> +        <omgdi:waypoint x="528" y="-280" /> 
-        <omgdi:waypoint x="620" y="-480" />+        <omgdi:waypoint x="590" y="-280" /> 
 +      </bpmndi:BPMNEdge> 
 +      <bpmndi:BPMNEdge id="Flow_1fpmuu7_di" bpmnElement="Flow_1fpmuu7"> 
 +        <omgdi:waypoint x="760" y="-305" /> 
 +        <omgdi:waypoint x="760" y="-370" /> 
 +        <omgdi:waypoint x="400" y="-370" /> 
 +        <omgdi:waypoint x="400" y="-305" /> 
 +        <bpmndi:BPMNLabel> 
 +          <omgdc:Bounds x="572" y="-388" width="17" height="14" /> 
 +        </bpmndi:BPMNLabel>
       </bpmndi:BPMNEdge>       </bpmndi:BPMNEdge>
       <bpmndi:BPMNEdge id="Flow_0v7giyt_di" bpmnElement="Flow_0v7giyt">       <bpmndi:BPMNEdge id="Flow_0v7giyt_di" bpmnElement="Flow_0v7giyt">
-        <omgdi:waypoint x="720" y="-480" /> +        <omgdi:waypoint x="690" y="-280" /> 
-        <omgdi:waypoint x="765" y="-480" />+        <omgdi:waypoint x="735" y="-280" />
       </bpmndi:BPMNEdge>       </bpmndi:BPMNEdge>
       <bpmndi:BPMNEdge id="Flow_0xssdyb_di" bpmnElement="Flow_0xssdyb">       <bpmndi:BPMNEdge id="Flow_0xssdyb_di" bpmnElement="Flow_0xssdyb">
-        <omgdi:waypoint x="815" y="-480" /> +        <omgdi:waypoint x="785" y="-280" /> 
-        <omgdi:waypoint x="852" y="-480" />+        <omgdi:waypoint x="822" y="-280" />
         <bpmndi:BPMNLabel>         <bpmndi:BPMNLabel>
-          <omgdc:Bounds x="827" y="-498" width="13" height="14" />+          <omgdc:Bounds x="797" y="-298" width="13" height="14" />
         </bpmndi:BPMNLabel>         </bpmndi:BPMNLabel>
       </bpmndi:BPMNEdge>       </bpmndi:BPMNEdge>
-      <bpmndi:BPMNEdge id="Flow_1fpmuu7_di" bpmnElement="Flow_1fpmuu7"> +      <bpmndi:BPMNEdge id="Flow_1omf6ox_di" bpmnElement="Flow_1omf6ox"> 
-        <omgdi:waypoint x="790" y="-505" /> +        <omgdi:waypoint x="400" y="-185" /> 
-        <omgdi:waypoint x="790" y="-570" /> +        <omgdi:waypoint x="400" y="-255" /> 
-        <omgdi:waypoint x="430" y="-570" /> +      </bpmndi:BPMNEdge> 
-        <omgdi:waypoint x="430" y="-505" /> +      <bpmndi:BPMNEdge id="Flow_1x386gx_di" bpmnElement="Flow_1x386gx"> 
-        <bpmndi:BPMNLabel> +        <omgdi:waypoint x="528" y="-160" /> 
-          <omgdc:Bounds x="602" y="-588" width="17" height="14" /> +        <omgdi:waypoint x="622" y="-160" />
-        </bpmndi:BPMNLabel>+
       </bpmndi:BPMNEdge>       </bpmndi:BPMNEdge>
     </bpmndi:BPMNPlane>     </bpmndi:BPMNPlane>
Line 309: Line 307:
 ===== Notes ===== ===== Notes =====
  
-Put extra comments here (this section is optional) +Mind the difference between the diagrams below: while "to do" process waits for the message all the time till the end, "no to do" process interrupts when the timer triggers. If the message arrives while we are clarifying delay with the client, it won't be caught and the process will hang after returning to the event gateway.
- +
-===== Exceptions ===== +
- +
-Specify exceptions to the rule above, if any +
 ===== See also ===== ===== See also =====
  
-Reference similar rules here (this section is optional)+  * [[en:rule:control_branch]] 
 +===== Автор(ы) =====
  
-===== Автор(ы) =====+ --- //[[user:bell|Anatoly Belaychuk]] 2023-09-10 12:51//
  
-Put signature here