CE-938 Adding cancel-process action, cancelStep meta-data

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/processes/CancelProcessAction.java

@@ -0,0 +1,110 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2022.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.actions.processes;
+
+
+import java.util.Optional;
+import java.util.UUID;
+import com.kingsrook.qqq.backend.core.actions.ActionHelper;
+import com.kingsrook.qqq.backend.core.exceptions.QBadRequestException;
+import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.logging.QLogger;
+import com.kingsrook.qqq.backend.core.model.actions.processes.ProcessState;
+import com.kingsrook.qqq.backend.core.model.actions.processes.RunProcessInput;
+import com.kingsrook.qqq.backend.core.model.actions.processes.RunProcessOutput;
+import com.kingsrook.qqq.backend.core.model.metadata.processes.QProcessMetaData;
+import com.kingsrook.qqq.backend.core.state.StateType;
+import com.kingsrook.qqq.backend.core.state.UUIDAndTypeStateKey;
+import static com.kingsrook.qqq.backend.core.logging.LogUtils.logPair;
+
+
+/*******************************************************************************
+ ** Action handler for running the cancel step of a qqq process
+ *
+ *******************************************************************************/
+public class CancelProcessAction extends RunProcessAction
+{
+   private static final QLogger LOG = QLogger.getLogger(CancelProcessAction.class);
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   public RunProcessOutput execute(RunProcessInput runProcessInput) throws QException
+   {
+      ActionHelper.validateSession(runProcessInput);
+
+      QProcessMetaData process = runProcessInput.getInstance().getProcess(runProcessInput.getProcessName());
+      if(process == null)
+      {
+         throw new QBadRequestException("Process [" + runProcessInput.getProcessName() + "] is not defined in this instance.");
+      }
+
+      if(runProcessInput.getProcessUUID() == null)
+      {
+         throw (new QBadRequestException("Cannot cancel process - processUUID was not given."));
+      }
+
+      UUIDAndTypeStateKey    stateKey     = new UUIDAndTypeStateKey(UUID.fromString(runProcessInput.getProcessUUID()), StateType.PROCESS_STATUS);
+      Optional<ProcessState> processState = getState(runProcessInput.getProcessUUID());
+      if(processState.isEmpty())
+      {
+         throw (new QBadRequestException("Cannot cancel process - State for process UUID [" + runProcessInput.getProcessUUID() + "] was not found."));
+      }
+
+      RunProcessOutput runProcessOutput = new RunProcessOutput();
+      try
+      {
+         if(process.getCancelStep() != null)
+         {
+            LOG.info("Running cancel step for process", logPair("processName", process.getName()));
+            runBackendStep(runProcessInput, process, runProcessOutput, stateKey, process.getCancelStep(), process, processState.get());
+         }
+         else
+         {
+            LOG.debug("Process does not have a custom cancel step to run.", logPair("processName", process.getName()));
+         }
+      }
+      catch(QException qe)
+      {
+         ////////////////////////////////////////////////////////////
+         // upon exception (e.g., one thrown by a step), throw it. //
+         ////////////////////////////////////////////////////////////
+         throw (qe);
+      }
+      catch(Exception e)
+      {
+         throw (new QException("Error cancelling process", e));
+      }
+      finally
+      {
+         //////////////////////////////////////////////////////
+         // always put the final state in the process result //
+         //////////////////////////////////////////////////////
+         runProcessOutput.setProcessState(processState.get());
+      }
+
+      return (runProcessOutput);
+   }
+
+}

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/processes/RunBackendStepAction.java

@@ -26,6 +26,7 @@ import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.stream.Collectors;
 import com.kingsrook.qqq.backend.core.actions.ActionHelper;
 import com.kingsrook.qqq.backend.core.actions.tables.QueryAction;
@@ -71,7 +72,17 @@ public class RunBackendStepAction
       QStepMetaData stepMetaData = process.getStep(runBackendStepInput.getStepName());
       if(stepMetaData == null)
       {
-         throw new QException("Step [" + runBackendStepInput.getStepName() + "] is not defined in the process [" + process.getName() + "]");
+         if(process.getCancelStep() != null && Objects.equals(process.getCancelStep().getName(), runBackendStepInput.getStepName()))
+         {
+            /////////////////////////////////////
+            // special case for cancel step... //
+            /////////////////////////////////////
+            stepMetaData = process.getCancelStep();
+         }
+         else
+         {
+            throw new QException("Step [" + runBackendStepInput.getStepName() + "] is not defined in the process [" + process.getName() + "]");
+         }
       }
 
       if(!(stepMetaData instanceof QBackendStepMetaData backendStepMetaData))

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/instances/QInstanceValidator.java

@@ -109,6 +109,7 @@ import com.kingsrook.qqq.backend.core.utils.StringUtils;
 import com.kingsrook.qqq.backend.core.utils.ValueUtils;
 import com.kingsrook.qqq.backend.core.utils.lambdas.UnsafeLambda;
 import org.quartz.CronExpression;
+import static com.kingsrook.qqq.backend.core.logging.LogUtils.logPair;
 
 
 /*******************************************************************************
@@ -151,6 +152,7 @@ public class QInstanceValidator
       // once, during the enrichment/validation work, so, capture it, and store it back in the instance. //
       /////////////////////////////////////////////////////////////////////////////////////////////////////
       JoinGraph joinGraph = null;
+      long      start     = System.currentTimeMillis();
       try
       {
          /////////////////////////////////////////////////////////////////////////////////////////////////
@@ -191,6 +193,9 @@ public class QInstanceValidator
          validateUniqueTopLevelNames(qInstance);
 
          runPlugins(QInstance.class, qInstance, qInstance);
+
+         long end = System.currentTimeMillis();
+         LOG.info("Validation (and enrichment) performance", logPair("millis", (end - start)));
       }
       catch(Exception e)
       {
@@ -668,17 +673,20 @@ public class QInstanceValidator
             {
                if(assertCondition(CollectionUtils.nullSafeHasContents(exposedJoin.getJoinPath()), joinPrefix + "is missing a joinPath."))
                {
-                  joinConnectionsForTable = Objects.requireNonNullElseGet(joinConnectionsForTable, () -> joinGraph.getJoinConnections(table.getName()));
+                  if(joinGraph != null)
-
-                  boolean foundJoinConnection = false;
-                  for(JoinGraph.JoinConnectionList joinConnectionList : joinConnectionsForTable)
                   {
-                     if(joinConnectionList.matchesJoinPath(exposedJoin.getJoinPath()))
+                     joinConnectionsForTable = Objects.requireNonNullElseGet(joinConnectionsForTable, () -> joinGraph.getJoinConnections(table.getName()));
+
+                     boolean foundJoinConnection = false;
+                     for(JoinGraph.JoinConnectionList joinConnectionList : joinConnectionsForTable)
                      {
-                        foundJoinConnection = true;
+                        if(joinConnectionList.matchesJoinPath(exposedJoin.getJoinPath()))
+                        {
+                           foundJoinConnection = true;
+                        }
                      }
+                     assertCondition(foundJoinConnection, joinPrefix + "specified a joinPath [" + exposedJoin.getJoinPath() + "] which does not match a valid join connection in the instance.");
                   }
-                  assertCondition(foundJoinConnection, joinPrefix + "specified a joinPath [" + exposedJoin.getJoinPath() + "] which does not match a valid join connection in the instance.");
 
                   assertCondition(!usedJoinPaths.contains(exposedJoin.getJoinPath()), tablePrefix + "has more than one join with the joinPath: " + exposedJoin.getJoinPath());
                   usedJoinPaths.add(exposedJoin.getJoinPath());
@@ -1479,7 +1487,7 @@ public class QInstanceValidator
                                  warn("Error loading expectedType for field [" + fieldMetaData.getName() + "] in process [" + processName + "]: " + e.getMessage());
                               }
 
-                              validateSimpleCodeReference("Process " + processName + " code reference: ", codeReference, expectedClass);
+                              validateSimpleCodeReference("Process " + processName + " code reference:", codeReference, expectedClass);
                            }
                         }
                      }
@@ -1487,6 +1495,14 @@ public class QInstanceValidator
                }
             }
 
+            if(process.getCancelStep() != null)
+            {
+               if(assertCondition(process.getCancelStep().getCode() != null, "Cancel step is missing a code reference, in process " + processName))
+               {
+                  validateSimpleCodeReference("Process " + processName + " cancel step code reference: ", process.getCancelStep().getCode(), BackendStep.class);
+               }
+            }
+
             ///////////////////////////////////////////////////////////////////////////////
             // if the process has a schedule, make sure required schedule data populated //
             ///////////////////////////////////////////////////////////////////////////////
@@ -1498,7 +1514,11 @@ public class QInstanceValidator
 
             if(process.getVariantBackend() != null)
             {
-               assertCondition(qInstance.getBackend(process.getVariantBackend()) != null, "Process " + processName + ", a variant backend was not found named " + process.getVariantBackend());
+               if(qInstance.getBackends() != null)
+               {
+                  assertCondition(qInstance.getBackend(process.getVariantBackend()) != null, "Process " + processName + ", a variant backend was not found named " + process.getVariantBackend());
+               }
+
                assertCondition(process.getVariantRunStrategy() != null, "A variant run strategy was not set for process " + processName + " (which does specify a variant backend)");
             }
             else

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/processes/QProcessMetaData.java

@@ -60,6 +60,8 @@ public class QProcessMetaData implements QAppChildMetaData, MetaDataWithPermissi
    private List<QStepMetaData>        stepList; // these are the steps that are ran, by-default, in the order they are ran in
    private Map<String, QStepMetaData> steps; // this is the full map of possible steps
 
+   private QBackendStepMetaData cancelStep;
+
    private QIcon icon;
 
    private QScheduleMetaData schedule;
@@ -675,6 +677,7 @@ public class QProcessMetaData implements QAppChildMetaData, MetaDataWithPermissi
    }
 
 
+
    /*******************************************************************************
     ** Getter for variantRunStrategy
     *******************************************************************************/
@@ -746,4 +749,35 @@ public class QProcessMetaData implements QAppChildMetaData, MetaDataWithPermissi
       return steps;
    }
 
+
+
+   /*******************************************************************************
+    ** Getter for cancelStep
+    *******************************************************************************/
+   public QBackendStepMetaData getCancelStep()
+   {
+      return (this.cancelStep);
+   }
+
+
+
+   /*******************************************************************************
+    ** Setter for cancelStep
+    *******************************************************************************/
+   public void setCancelStep(QBackendStepMetaData cancelStep)
+   {
+      this.cancelStep = cancelStep;
+   }
+
+
+
+   /*******************************************************************************
+    ** Fluent setter for cancelStep
+    *******************************************************************************/
+   public QProcessMetaData withCancelStep(QBackendStepMetaData cancelStep)
+   {
+      this.cancelStep = cancelStep;
+      return (this);
+   }
+
 }

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/actions/processes/CancelProcessActionTest.java

@@ -0,0 +1,139 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2024.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.actions.processes;
+
+
+import java.util.UUID;
+import com.kingsrook.qqq.backend.core.BaseTest;
+import com.kingsrook.qqq.backend.core.context.QContext;
+import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.logging.QCollectingLogger;
+import com.kingsrook.qqq.backend.core.logging.QLogger;
+import com.kingsrook.qqq.backend.core.model.actions.processes.RunBackendStepInput;
+import com.kingsrook.qqq.backend.core.model.actions.processes.RunBackendStepOutput;
+import com.kingsrook.qqq.backend.core.model.actions.processes.RunProcessInput;
+import com.kingsrook.qqq.backend.core.model.actions.processes.RunProcessOutput;
+import com.kingsrook.qqq.backend.core.model.metadata.code.QCodeReference;
+import com.kingsrook.qqq.backend.core.model.metadata.processes.QBackendStepMetaData;
+import com.kingsrook.qqq.backend.core.utils.TestUtils;
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+/*******************************************************************************
+ ** Unit test for CancelProcessAction 
+ *******************************************************************************/
+public class CancelProcessActionTest extends BaseTest
+{
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testBadInputs()
+   {
+      RunProcessInput input = new RunProcessInput();
+      assertThatThrownBy(() -> new CancelProcessAction().execute(input))
+         .hasMessageContaining("Process [null] is not defined");
+
+      input.setProcessName("foobar");
+      assertThatThrownBy(() -> new CancelProcessAction().execute(input))
+         .hasMessageContaining("Process [foobar] is not defined");
+
+      input.setProcessName(TestUtils.PROCESS_NAME_GREET_PEOPLE_INTERACTIVE);
+      assertThatThrownBy(() -> new CancelProcessAction().execute(input))
+         .hasMessageContaining("processUUID was not given");
+
+      input.setProcessUUID(UUID.randomUUID().toString());
+      assertThatThrownBy(() -> new CancelProcessAction().execute(input))
+         .hasMessageContaining("State for process UUID")
+         .hasMessageContaining("was not found");
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void test() throws QException
+   {
+      try
+      {
+         ///////////////////////////////////////////////////////////////
+         // start up the process - having it break upon frontend step //
+         ///////////////////////////////////////////////////////////////
+         RunProcessInput input = new RunProcessInput();
+         input.setProcessName(TestUtils.PROCESS_NAME_GREET_PEOPLE_INTERACTIVE);
+         input.setFrontendStepBehavior(RunProcessInput.FrontendStepBehavior.BREAK);
+
+         RunProcessOutput runProcessOutput = new RunProcessAction().execute(input);
+         input.setProcessUUID(runProcessOutput.getProcessUUID());
+
+         /////////////////////////////////////////////////////////////////////////////////
+         // try to run the cancel action, but, with no cancel step, it should exit noop //
+         /////////////////////////////////////////////////////////////////////////////////
+         QCollectingLogger collectingLogger = QLogger.activateCollectingLoggerForClass(CancelProcessAction.class);
+         new CancelProcessAction().execute(input);
+         assertThat(collectingLogger.getCollectedMessages())
+            .anyMatch(m -> m.getMessage().contains("does not have a custom cancel step"));
+         collectingLogger.clear();
+
+         ///////////////////////////////////////
+         // add a cancel step to this process //
+         ///////////////////////////////////////
+         QContext.getQInstance().getProcess(TestUtils.PROCESS_NAME_GREET_PEOPLE_INTERACTIVE)
+            .setCancelStep(new QBackendStepMetaData().withCode(new QCodeReference(CancelStep.class)));
+
+         new CancelProcessAction().execute(input);
+         assertThat(collectingLogger.getCollectedMessages())
+            .noneMatch(m -> m.getMessage().contains("does not have a custom cancel step"))
+            .anyMatch(m -> m.getMessage().contains("Running cancel step"));
+         assertEquals(1, CancelStep.callCount);
+      }
+      finally
+      {
+         QLogger.deactivateCollectingLoggerForClass(CancelProcessAction.class);
+      }
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   public static class CancelStep implements BackendStep
+   {
+      static int callCount = 0;
+
+
+
+      @Override
+      public void run(RunBackendStepInput runBackendStepInput, RunBackendStepOutput runBackendStepOutput) throws QException
+      {
+         callCount++;
+      }
+   }
+
+}

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/instances/QInstanceValidatorTest.java

@@ -38,6 +38,7 @@ import com.kingsrook.qqq.backend.core.actions.dashboard.PersonsByCreateDateBarCh
 import com.kingsrook.qqq.backend.core.actions.dashboard.widgets.AbstractWidgetRenderer;
 import com.kingsrook.qqq.backend.core.actions.dashboard.widgets.ParentWidgetRenderer;
 import com.kingsrook.qqq.backend.core.actions.processes.BackendStep;
+import com.kingsrook.qqq.backend.core.actions.processes.CancelProcessActionTest;
 import com.kingsrook.qqq.backend.core.context.QContext;
 import com.kingsrook.qqq.backend.core.exceptions.QException;
 import com.kingsrook.qqq.backend.core.exceptions.QInstanceValidationException;
@@ -69,6 +70,7 @@ import com.kingsrook.qqq.backend.core.model.metadata.layout.QIcon;
 import com.kingsrook.qqq.backend.core.model.metadata.possiblevalues.QPossibleValue;
 import com.kingsrook.qqq.backend.core.model.metadata.possiblevalues.QPossibleValueSource;
 import com.kingsrook.qqq.backend.core.model.metadata.possiblevalues.QPossibleValueSourceType;
+import com.kingsrook.qqq.backend.core.model.metadata.processes.QBackendStepMetaData;
 import com.kingsrook.qqq.backend.core.model.metadata.processes.QProcessMetaData;
 import com.kingsrook.qqq.backend.core.model.metadata.queues.SQSQueueProviderMetaData;
 import com.kingsrook.qqq.backend.core.model.metadata.reporting.QReportDataSource;
@@ -154,7 +156,7 @@ public class QInstanceValidatorTest extends BaseTest
    @Test
    public void test_validateEmptyBackends()
    {
-      assertValidationFailureReasons((qInstance) -> qInstance.setBackends(new HashMap<>()),
+      assertValidationFailureReasonsAllowingExtraReasons((qInstance) -> qInstance.setBackends(new HashMap<>()),
          "At least 1 backend must be defined");
    }
 
@@ -393,6 +395,26 @@ public class QInstanceValidatorTest extends BaseTest
 
 
 
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void test_validateProcessCancelSteps()
+   {
+      assertValidationFailureReasons((qInstance) -> qInstance.getProcess(TestUtils.PROCESS_NAME_GREET_PEOPLE).withCancelStep(new QBackendStepMetaData()),
+         "Cancel step is missing a code reference");
+
+      assertValidationFailureReasons((qInstance) -> qInstance.getProcess(TestUtils.PROCESS_NAME_GREET_PEOPLE).withCancelStep(new QBackendStepMetaData().withCode(new QCodeReference())),
+         "missing a code reference name", "missing a code type");
+
+      assertValidationFailureReasons((qInstance) -> qInstance.getProcess(TestUtils.PROCESS_NAME_GREET_PEOPLE).withCancelStep(new QBackendStepMetaData().withCode(new QCodeReference(ValidAuthCustomizer.class))),
+         "CodeReference is not of the expected type");
+
+      assertValidationSuccess((qInstance) -> qInstance.getProcess(TestUtils.PROCESS_NAME_GREET_PEOPLE).withCancelStep(new QBackendStepMetaData().withCode(new QCodeReference(CancelProcessActionTest.CancelStep.class))));
+   }
+
+
+
    /*******************************************************************************
     **
     *******************************************************************************/
@@ -537,7 +559,8 @@ public class QInstanceValidatorTest extends BaseTest
          ////////////////////////////////////////////////////
          // make sure if remove all plugins, we don't fail //
          ////////////////////////////////////////////////////
-         assertValidationSuccess((qInstance) -> {});
+         assertValidationSuccess((qInstance) -> {
+         });
       }
    }
 

qqq-middleware-javalin/src/main/java/com/kingsrook/qqq/backend/javalin/QJavalinProcessHandler.java

@@ -45,6 +45,7 @@ import com.kingsrook.qqq.backend.core.actions.async.AsyncJobState;
 import com.kingsrook.qqq.backend.core.actions.async.AsyncJobStatus;
 import com.kingsrook.qqq.backend.core.actions.async.JobGoingAsyncException;
 import com.kingsrook.qqq.backend.core.actions.permissions.PermissionsHelper;
+import com.kingsrook.qqq.backend.core.actions.processes.CancelProcessAction;
 import com.kingsrook.qqq.backend.core.actions.processes.QProcessCallback;
 import com.kingsrook.qqq.backend.core.actions.processes.RunProcessAction;
 import com.kingsrook.qqq.backend.core.actions.reporting.GenerateReportAction;
@@ -130,6 +131,7 @@ public class QJavalinProcessHandler
                   post("/step/{step}", QJavalinProcessHandler::processStep);
                   get("/status/{jobUUID}", QJavalinProcessHandler::processStatus);
                   get("/records", QJavalinProcessHandler::processRecords);
+                  get("/cancel", QJavalinProcessHandler::processCancel);
                });
 
                get("/possibleValues/{fieldName}", QJavalinProcessHandler::possibleValues);
@@ -768,6 +770,32 @@ public class QJavalinProcessHandler
 
 
 
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   private static void processCancel(Context context)
+   {
+      try
+      {
+         RunProcessInput runProcessInput = new RunProcessInput();
+         QJavalinImplementation.setupSession(context, runProcessInput);
+
+         runProcessInput.setProcessName(context.pathParam("processName"));
+         runProcessInput.setProcessUUID(context.pathParam("processUUID"));
+
+         new CancelProcessAction().execute(runProcessInput);
+
+         Map<String, Object> resultForCaller = new HashMap<>();
+         context.result(JsonUtils.toJson(resultForCaller));
+      }
+      catch(Exception e)
+      {
+         QJavalinImplementation.handleException(context, e);
+      }
+   }
+
+
+
    /*******************************************************************************
     **
     *******************************************************************************/

qqq-middleware-javalin/src/test/java/com/kingsrook/qqq/backend/javalin/QJavalinProcessHandlerTest.java

@@ -25,6 +25,7 @@ package com.kingsrook.qqq.backend.javalin;
 import java.net.URLEncoder;
 import java.nio.charset.Charset;
 import java.util.List;
+import java.util.UUID;
 import com.kingsrook.qqq.backend.core.actions.async.AsyncJobState;
 import com.kingsrook.qqq.backend.core.model.actions.tables.query.QCriteriaOperator;
 import com.kingsrook.qqq.backend.core.model.actions.tables.query.QFilterCriteria;
@@ -604,4 +605,45 @@ class QJavalinProcessHandlerTest extends QJavalinTestBase
       assertEquals(1, jsonObject.getJSONArray("options").getJSONObject(0).getInt("id"));
       assertEquals("Darin Kelkhoff (1)", jsonObject.getJSONArray("options").getJSONObject(0).getString("label"));
    }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void test_processCancel()
+   {
+      /////////////////////////
+      // 400s for bad inputs //
+      /////////////////////////
+      {
+         HttpResponse<String> response = Unirest.get(BASE_URL + "/processes/noSuchProcess/" + UUID.randomUUID() + "/cancel").asString();
+         assertEquals(400, response.getStatus());
+         assertThat(response.getBody()).contains("Process [noSuchProcess] is not defined in this instance");
+      }
+      {
+         HttpResponse<String> response = Unirest.get(BASE_URL + "/processes/" + TestUtils.PROCESS_NAME_SIMPLE_SLEEP + "/" + UUID.randomUUID() + "/cancel").asString();
+         assertEquals(400, response.getStatus());
+         assertThat(response.getBody()).matches(".*State for process UUID.*not found.*");
+      }
+
+      ///////////////////////////////////
+      // start a process, get its uuid //
+      ///////////////////////////////////
+      String processBasePath = BASE_URL + "/processes/" + TestUtils.PROCESS_NAME_SLEEP_INTERACTIVE;
+      HttpResponse<String> response = Unirest.post(processBasePath + "/init?" + TestUtils.SleeperStep.FIELD_SLEEP_MILLIS + "=" + MORE_THAN_TIMEOUT)
+         .header("Content-Type", "application/json").asString();
+
+      JSONObject jsonObject  = assertProcessStepCompleteResponse(response);
+      String     processUUID = jsonObject.getString("processUUID");
+      assertNotNull(processUUID, "Process UUID should not be null.");
+
+      /////////////////////////////////////////
+      // now cancel that, and expect success //
+      /////////////////////////////////////////
+      response = Unirest.get(BASE_URL + "/processes/" + TestUtils.PROCESS_NAME_SLEEP_INTERACTIVE + "/" + processUUID + "/cancel").asString();
+      assertEquals(200, response.getStatus());
+   }
+
 }