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/*
* ============LICENSE_START=======================================================
* feature-active-standby-management
* ================================================================================
* Copyright (C) 2017-2019 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.activestandby;
import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.onap.policy.drools.core.PolicySessionFeatureApi;
import org.onap.policy.drools.features.PolicyEngineFeatureApi;
import org.onap.policy.drools.statemanagement.StateManagementFeatureApi;
import org.onap.policy.drools.statemanagement.StateManagementFeatureApiConstants;
import org.onap.policy.drools.system.PolicyEngine;
import org.onap.policy.drools.system.PolicyEngineConstants;
import org.onap.policy.drools.utils.PropertyUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* If this feature is supported, there is a single instance of it.
* It adds persistence to Drools sessions, but it is also intertwined with
* active/standby state management and IntegrityMonitor. For now, they are
* all treated as a single feature, but it would be nice to separate them.
*
* <p>The bulk of the code here was once in other classes, such as
* 'PolicyContainer' and 'Main'. It was moved here as part of making this
* a separate optional feature.
*/
public class ActiveStandbyFeature implements ActiveStandbyFeatureApi,
PolicySessionFeatureApi, PolicyEngineFeatureApi {
// get an instance of logger
private static final Logger logger =
LoggerFactory.getLogger(ActiveStandbyFeature.class);
private static DroolsPdp myPdp;
private static Object myPdpSync = new Object();
private static DroolsPdpsElectionHandler electionHandler;
private StateManagementFeatureApi stateManagementFeature;
public static final int SEQ_NUM = 1;
/*========================*/
/* 'FeatureAPI' interface */
/*========================*/
/**
* {@inheritDoc}.
*/
@Override
public int getSequenceNumber() {
return SEQ_NUM;
}
/**
* {@inheritDoc}.
*/
@Override
public void globalInit(String[] args, String configDir) {
// This must come first since it initializes myPdp
initializePersistence(configDir);
for (StateManagementFeatureApi feature : StateManagementFeatureApiConstants.getImpl().getList()) {
if (feature.getResourceName().equals(myPdp.getPdpId())) {
logger.debug("ActiveStandbyFeature.globalInit: Found StateManagementFeature"
+ " with resourceName: {}", myPdp.getPdpId());
stateManagementFeature = feature;
break;
}
}
if (stateManagementFeature == null) {
logger.debug("ActiveStandbyFeature failed to initialize. "
+ "Unable to get instance of StateManagementFeatureApi "
+ "with resourceID: {}", myPdp.getPdpId());
logger.error("ActiveStandbyFeature failed to initialize. "
+ "Unable to get instance of StateManagementFeatureApi "
+ "with resourceID: {}", myPdp.getPdpId());
//
// Cannot add observer since stateManagementFeature is null
//
return;
}
//Create an instance of the Observer
PmStandbyStateChangeNotifier pmNotifier = new PmStandbyStateChangeNotifier();
//Register the PMStandbyStateChangeNotifier Observer
stateManagementFeature.addObserver(pmNotifier);
logger.debug("ActiveStandbyFeature.globalInit() exit");
}
/**
* {@inheritDoc}.
*/
@Override
public boolean afterStart(PolicyEngine engine) {
// ASSERTION: engine == PolicyEngine.manager
PolicyEngineConstants.getManager().lock();
return false;
}
/**
* Read in the persistence properties, determine whether persistence is
* enabled or disabled, and initialize persistence if enabled.
*/
private static void initializePersistence(String configDir) {
//Get the Active Standby properties
try {
Properties activeStandbyProperties =
PropertyUtil.getProperties(configDir + "/feature-active-standby-management.properties");
ActiveStandbyProperties.initProperties(activeStandbyProperties);
logger.info("initializePersistence: ActiveStandbyProperties success");
} catch (IOException e) {
logger.error("ActiveStandbyFeature: initializePersistence ActiveStandbyProperties", e);
}
DroolsPdpsConnector conn = getDroolsPdpsConnector("activeStandbyPU");
String resourceName = ActiveStandbyProperties.getProperty(ActiveStandbyProperties.NODE_NAME);
if (resourceName == null) {
throw new NullPointerException();
}
/*
* In a JUnit test environment, one or more PDPs may already have been
* inserted in the DB, so we need to check for this.
*/
DroolsPdp existingPdp = conn.getPdp(resourceName);
if (existingPdp != null) {
logger.info("Found existing PDP record, pdpId="
+ existingPdp.getPdpId() + ", isDesignated="
+ existingPdp.isDesignated() + ", updatedDate="
+ existingPdp.getUpdatedDate());
myPdp = existingPdp;
}
synchronized (myPdpSync) {
if (myPdp == null) {
myPdp = new DroolsPdpImpl(resourceName,false,4,new Date());
}
String siteName = ActiveStandbyProperties.getProperty(ActiveStandbyProperties.SITE_NAME);
if (siteName == null) {
siteName = "";
} else {
siteName = siteName.trim();
}
myPdp.setSite(siteName);
if (electionHandler == null) {
electionHandler = new DroolsPdpsElectionHandler(conn,myPdp);
}
}
logger.info("\n\nThis controller is a standby, waiting to be chosen as primary...\n\n");
}
/**
* Moved code to instantiate a JpaDroolsPdpsConnector object from main() to
* this method, so it can also be accessed from StandbyStateChangeNotifier
* class.
*
* @param pu string
* @return connector object
*/
public static DroolsPdpsConnector getDroolsPdpsConnector(String pu) {
Map<String, Object> propMap = new HashMap<>();
propMap.put("javax.persistence.jdbc.driver", ActiveStandbyProperties
.getProperty(ActiveStandbyProperties.DB_DRIVER));
propMap.put("javax.persistence.jdbc.url",
ActiveStandbyProperties.getProperty(ActiveStandbyProperties.DB_URL));
propMap.put("javax.persistence.jdbc.user", ActiveStandbyProperties
.getProperty(ActiveStandbyProperties.DB_USER));
propMap.put("javax.persistence.jdbc.password",
ActiveStandbyProperties.getProperty(ActiveStandbyProperties.DB_PWD));
EntityManagerFactory emf = Persistence.createEntityManagerFactory(
pu, propMap);
return new JpaDroolsPdpsConnector(emf);
}
/**
* {@inheritDoc}.
*/
@Override
public String getPdpdNowActive() {
return electionHandler.getPdpdNowActive();
}
/**
* {@inheritDoc}.
*/
@Override
public String getPdpdLastActive() {
return electionHandler.getPdpdLastActive();
}
/**
* {@inheritDoc}.
*/
@Override
public String getResourceName() {
return myPdp.getPdpId();
}
}
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