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/*-
* ============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);
}
}
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