Add back auto process migration

Add back auto process migration

Issue-ID: SO-3069
Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
Change-Id: I50fc83484e9bd992e1419f980dcc54055ca40cb8

1 files changed, 111 insertions, 0 deletions

diff --git a/bpmn/mso-infrastructure-bpmn/src/main/java/org/onap/so/bpmn/common/workflow/service/AutoProcessInstanceMigrationService.java b/bpmn/mso-infrastructure-bpmn/src/main/java/org/onap/so/bpmn/common/workflow/service/AutoProcessInstanceMigrationService.java
new file mode 100644
index 0000000000..58d0c6d374
--- /dev/null
+++ b/bpmn/mso-infrastructure-bpmn/src/main/java/org/onap/so/bpmn/common/workflow/service/AutoProcessInstanceMigrationService.java
@@ -0,0 +1,111 @@
+package org.onap.so.bpmn.common.workflow.service;
+
+import java.util.ArrayList;
+import java.util.List;
+import org.camunda.bpm.engine.ProcessEngine;
+import org.camunda.bpm.engine.RepositoryService;
+import org.camunda.bpm.engine.RuntimeService;
+import org.camunda.bpm.engine.migration.MigrationInstruction;
+import org.camunda.bpm.engine.migration.MigrationPlan;
+import org.camunda.bpm.engine.migration.MigrationPlanExecutionBuilder;
+import org.camunda.bpm.engine.repository.ProcessDefinition;
+import org.camunda.bpm.engine.runtime.ProcessInstance;
+import org.camunda.bpm.engine.runtime.ProcessInstanceQuery;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.event.EventListener;
+import org.springframework.core.env.Environment;
+import org.springframework.stereotype.Service;
+
+@Service
+public class AutoProcessInstanceMigrationService {
+
+    private static Logger logger = LoggerFactory.getLogger(AutoProcessInstanceMigrationService.class);
+
+    @Autowired
+    private Environment env;
+    @Autowired
+    protected ProcessEngine processEngine;
+
+    @Value("${migration.autoMigrationEnabled:false}")
+    private boolean autoMigrationEnabled;
+
+    private RuntimeService runtimeService;
+    private RepositoryService repositoryService;
+    private List<String> processDefinitionKeys;
+
+    @EventListener(ApplicationReadyEvent.class)
+    protected void executeAutoProcessInstanceMigrations() {
+        if (autoMigrationEnabled) {
+            runtimeService = processEngine.getRuntimeService();
+            repositoryService = processEngine.getRepositoryService();
+            for (ProcessDefinition definition : getProcessDefinitions()) {
+                for (ProcessDefinition procDefOld : getOldProcessDefinitions(definition.getKey(),
+                        definition.getVersion())) {
+                    migrate(procDefOld.getId(), definition.getId());
+                }
+            }
+        }
+    }
+
+    protected List<ProcessDefinition> getProcessDefinitions() {
+
+        List<ProcessDefinition> processDefinitions = new ArrayList<ProcessDefinition>();
+        processDefinitionKeys = env.getProperty("migration.processDefinitionKeys", List.class, new ArrayList<String>());
+        for (String key : processDefinitionKeys) {
+            processDefinitions.add(repositoryService.createProcessDefinitionQuery().processDefinitionKey(key)
+                    .latestVersion().singleResult());
+        }
+        return processDefinitions;
+    }
+
+    private void migrate(String sourceProcessDefinitionId, String targetProcessDefinitionId) {
+        MigrationPlan migrationPlan =
+                runtimeService.createMigrationPlan(sourceProcessDefinitionId, targetProcessDefinitionId)
+                        .mapEqualActivities().updateEventTriggers().build();
+        List<String> activityIds = new ArrayList<>();
+
+        for (MigrationInstruction instruction : migrationPlan.getInstructions()) {
+            activityIds.add(instruction.getSourceActivityId());
+        }
+        for (String activityId : activityIds) {
+            ProcessInstanceQuery activeProcessInstancesQuery = runtimeService.createProcessInstanceQuery()
+                    .processDefinitionId(sourceProcessDefinitionId).activityIdIn(activityId).active();
+            if (!activeProcessInstancesQuery.list().isEmpty()) {
+                logger.info("Migrating {} process instance(s) from {} to {}",
+                        Long.valueOf(activeProcessInstancesQuery.count()), sourceProcessDefinitionId,
+                        targetProcessDefinitionId);
+                MigrationPlanExecutionBuilder migration =
+                        runtimeService.newMigration(migrationPlan).processInstanceQuery(activeProcessInstancesQuery);
+                migration.executeAsync();
+            }
+        }
+        suspendEmptyProcessDefinition(sourceProcessDefinitionId);
+    }
+
+    private void suspendEmptyProcessDefinition(String sourceProcessDefinitionId) {
+        List<ProcessInstance> activeProcessInstances = runtimeService.createProcessInstanceQuery()
+                .processDefinitionId(sourceProcessDefinitionId).active().list();
+        if (activeProcessInstances.isEmpty()) {
+            repositoryService.suspendProcessDefinitionById(sourceProcessDefinitionId);
+        } else {
+            logger.info("Unable to migrate {} process instance(s) from {}",
+                    Integer.valueOf(activeProcessInstances.size()), sourceProcessDefinitionId);
+        }
+    }
+
+    protected List<ProcessDefinition> getOldProcessDefinitions(String key, int version) {
+        List<ProcessDefinition> processDefinitions =
+                repositoryService.createProcessDefinitionQuery().processDefinitionKey(key).list();
+        List<ProcessDefinition> oldProcessDefinitions = new ArrayList<>();
+        for (ProcessDefinition processDef : processDefinitions) {
+            if (!processDef.isSuspended() && (processDef.getVersion() != version)) {
+                oldProcessDefinitions.add(processDef);
+            }
+        }
+        return oldProcessDefinitions;
+    }
+}