diff options
Diffstat (limited to 'feature-drools-init/src/main')
2 files changed, 88 insertions, 0 deletions
diff --git a/feature-drools-init/src/main/java/org/onap/policy/drools/droolsinit/DroolsInitFeature.java b/feature-drools-init/src/main/java/org/onap/policy/drools/droolsinit/DroolsInitFeature.java new file mode 100644 index 00000000..b3b8485c --- /dev/null +++ b/feature-drools-init/src/main/java/org/onap/policy/drools/droolsinit/DroolsInitFeature.java @@ -0,0 +1,87 @@ +/*- + * ============LICENSE_START======================================================= + * feature-drools-init + * ================================================================================ + * Copyright (C) 2019 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.kie.api.runtime.rule.FactHandle; + +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 FactHandle factHandle = policySession.getKieSession().insert(this); + + // after 10 minutes, remove the object from Drools memory (if needed) + PolicyEngineConstants.getManager().getExecutorService().schedule( + new Runnable() { + @Override + public void run() { + if (policySession.getKieSession().getObject(factHandle) != null) { + // object has not been removed by application -- remove it here + policySession.getKieSession().delete(factHandle); + } + } + }, DELAY, TimeUnit.MILLISECONDS); + } + } +} diff --git a/feature-drools-init/src/main/resources/META-INF/services/org.onap.policy.drools.core.PolicySessionFeatureApi b/feature-drools-init/src/main/resources/META-INF/services/org.onap.policy.drools.core.PolicySessionFeatureApi new file mode 100644 index 00000000..9c088eee --- /dev/null +++ b/feature-drools-init/src/main/resources/META-INF/services/org.onap.policy.drools.core.PolicySessionFeatureApi @@ -0,0 +1 @@ +org.onap.policy.drools.droolsinit.DroolsInitFeature |