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/*-
* ============LICENSE_START=======================================================
* feature-drools-init
* ================================================================================
* Copyright (C) 2019, 2021 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.drools.droolsinit;
import java.io.Serializable;
import java.util.concurrent.TimeUnit;
import org.onap.policy.drools.core.PolicySession;
import org.onap.policy.drools.core.PolicySessionFeatureApi;
import org.onap.policy.drools.system.PolicyEngineConstants;
/**
* This feature inserts an object of class 'DroolsInitFeature.Init' into
* every newly-created or updated Drools session, including those that were
* initialized with persistent data. Rules matching on objects of this type
* can then do things like initialize global data.
*/
public class DroolsInitFeature implements PolicySessionFeatureApi {
// default delay is 10 minutes
private static final long DELAY = 600000L;
/**
* {@inheritDoc}.
*/
@Override
public int getSequenceNumber() {
return 0;
}
/**
* {@inheritDoc}.
*/
@Override
public PolicySession.ThreadModel selectThreadModel(PolicySession policySession) {
new Init(policySession);
return null;
}
/**
* Instances of this class are inserted into Drools memory.
*/
public static class Init implements Serializable {
private static final long serialVersionUID = 1L;
/**
* Place this instance in Drools memory, and then remove it after
* one minute, if it is still there.
*
* @param policySession the associated session
*/
public Init(final PolicySession policySession) {
// insert this instance into Drools memory
final var factHandle = policySession.getKieSession().insert(this);
// after 10 minutes, remove the object from Drools memory (if needed)
PolicyEngineConstants.getManager().getExecutorService().schedule(() -> {
if (policySession.getKieSession().getObject(factHandle) != null) {
// object has not been removed by application -- remove it here
policySession.getKieSession().delete(factHandle);
}
}, DELAY, TimeUnit.MILLISECONDS);
}
}
}
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