1 files changed, 74 insertions, 0 deletions
diff --git a/controlloop/common/eventmanager/src/main/java/org/onap/policy/controlloop/eventmanager/ControlLoopEventManager2Drools.java b/controlloop/common/eventmanager/src/main/java/org/onap/policy/controlloop/eventmanager/ControlLoopEventManager2Drools.java
new file mode 100644
index 000000000..3af9defc7
--- /dev/null
+++ b/controlloop/common/eventmanager/src/main/java/org/onap/policy/controlloop/eventmanager/ControlLoopEventManager2Drools.java
@@ -0,0 +1,74 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.controlloop.eventmanager;
+
+import org.drools.core.WorkingMemory;
+import org.kie.api.runtime.rule.FactHandle;
+import org.onap.policy.controlloop.ControlLoopException;
+import org.onap.policy.controlloop.VirtualControlLoopEvent;
+import org.onap.policy.controlloop.drl.legacy.ControlLoopParams;
+
+/**
+ * Manager for a single control loop event. Once this has been created, the event can be
+ * retracted from working memory. Once this has been created, {@link #start()} should be
+ * invoked, and then {@link #nextStep()} should be invoked continually until
+ * {@link #isActive()} returns {@code false}, indicating that all steps have completed.
+ */
+public class ControlLoopEventManager2Drools extends ControlLoopEventManager2 {
+    private final transient WorkingMemory workMem;
+    private transient FactHandle factHandle;
+
+    /**
+     * Constructs the object.
+     *
+     * @param params control loop parameters
+     * @param event event to be managed by this object
+     * @param workMem working memory to update if this changes
+     * @throws ControlLoopException if the event is invalid or if a YAML processor cannot
+     *         be created
+     */
+    public ControlLoopEventManager2Drools(ControlLoopParams params, VirtualControlLoopEvent event,
+        WorkingMemory workMem) throws ControlLoopException {
+
+        super(params, event);
+        this.workMem = workMem;
+    }
+
+    /**
+     * This is a hook added to 'ControlLoopEventManager2.start()' --
+     * here, we add an additional check.
+     */
+    @Override
+    protected void startHook() {
+        if ((factHandle = workMem.getFactHandle(this)) == null) {
+            throw new IllegalStateException("manager is not in working memory");
+        }
+    }
+
+    /**
+     * This is a hook added to 'ControlLoopEventManager2.updated(...)' --
+     * here, we mark it as updated in Drools memory.
+     */
+    @Override
+    protected void notifyUpdate() {
+        workMem.update(factHandle, this);
+    }
+}