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authorKevin McKiou <km097d@att.com>2017-09-14 12:31:02 -0500
committerKevin McKiou <km097d@att.com>2017-09-21 14:57:24 -0500
commit4c53995dd9917f05b9558bb81aa33caf9e8f0f97 (patch)
tree7ce7b788de60e03d1bac2d3c79fa38c4f515f784 /feature-active-standby-management/src/main/java/org
parentfbed3c9c7b816b9fa4dd96dc218a0603b1d1c544 (diff)
Addition of Active-Standby Feature
Patch 1: Adds the active-standby feature to drools-pdp. This feature provides the state control of the drools-pdp nodes controlling failover with a site and across sites. Patch 2: Resolve merge conflict in packages/install/pom.xml and pom.xml. Patch 3: Resolved comments from Pamela Dragosh and Jorge Hernandez. Issue-ID: POLICY-156 Change-Id: I922b3d5d8a464006e9675924bcbc7409d68c08d5 Signed-off-by: Kevin McKiou <km097d@att.com>
Diffstat (limited to 'feature-active-standby-management/src/main/java/org')
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeature.java240
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyProperties.java71
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdp.java39
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpEntity.java137
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpImpl.java92
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpObject.java71
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsConnector.java63
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java1076
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/JpaDroolsPdpsConnector.java636
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/PMStandbyStateChangeNotifier.java345
-rw-r--r--feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ThreadRunningChecker.java26
11 files changed, 2796 insertions, 0 deletions
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeature.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeature.java
new file mode 100644
index 00000000..d40a9e0f
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeature.java
@@ -0,0 +1,240 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+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.system.PolicyEngine;
+import org.onap.policy.drools.utils.PropertyUtil;
+
+/**
+ * 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.
+ *
+ * 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 : StateManagementFeatureAPI.impl.getList())
+ {
+ if (feature.getResourceName().equals(myPdp.getPdpId()))
+ {
+ if(logger.isDebugEnabled()){
+ logger.debug("ActiveStandbyFeature.globalInit: Found StateManagementFeature"
+ + " with resourceName: {}", myPdp.getPdpId());
+ }
+ stateManagementFeature = feature;
+ break;
+ }
+ }
+ if(stateManagementFeature == null){
+ if(logger.isDebugEnabled()){
+ 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());
+ }
+
+
+
+ //Create an instance of the Observer
+ PMStandbyStateChangeNotifier pmNotifier = new PMStandbyStateChangeNotifier();
+
+ //Register the PMStandbyStateChangeNotifier Observer
+ stateManagementFeature.addObserver(pmNotifier);
+ if(logger.isDebugEnabled()){
+ logger.debug("ActiveStandbyFeature.globalInit() exit");
+ }
+ }
+
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public boolean afterStart(PolicyEngine engine)
+ {
+ // ASSERTION: engine == PolicyEngine.manager
+ PolicyEngine.manager.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) {
+ System.out.println("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());
+ }
+ if(myPdp != null){
+ String site_name = ActiveStandbyProperties.getProperty(ActiveStandbyProperties.SITE_NAME);
+ if (site_name == null) {
+ site_name = "";
+ }else{
+ site_name = site_name.trim();
+ }
+ myPdp.setSiteName(site_name);
+ }
+ if(electionHandler == null){
+ electionHandler = new DroolsPdpsElectionHandler(conn,myPdp);
+ }
+ }
+ System.out.println("\n\nThis controller is a standby, waiting to be chosen as primary...\n\n");
+ 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.
+ */
+ public static DroolsPdpsConnector getDroolsPdpsConnector(String pu) {
+
+ Map<String, Object> propMap = new HashMap<String, Object>();
+ 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);
+ DroolsPdpsConnector conn = new JpaDroolsPdpsConnector(emf);
+
+ return conn;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public String getPdpdNowActive(){
+ return electionHandler.getPdpdNowActive();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public String getPdpdLastActive(){
+ return electionHandler.getPdpdLastActive();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public String getResourceName() {
+ return myPdp.getPdpId();
+ }
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyProperties.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyProperties.java
new file mode 100644
index 00000000..6e26334b
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyProperties.java
@@ -0,0 +1,71 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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.util.Properties;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ActiveStandbyProperties {
+ // get an instance of logger
+ private static final Logger logger = LoggerFactory.getLogger(ActiveStandbyProperties.class);
+
+ public static final String PDP_CHECK_INVERVAL = "pdp.checkInterval";
+ public static final String PDP_UPDATE_INTERVAL = "pdp.updateInterval";
+ public static final String PDP_TIMEOUT = "pdp.timeout";
+ public static final String PDP_INITIAL_WAIT_PERIOD = "pdp.initialWait";
+
+ public static final String NODE_NAME = "resource.name";
+ public static final String SITE_NAME = "site_name";
+
+ /*
+ * feature-active-standby-management.properties parameter key values
+ */
+ public static final String DB_DRIVER = "javax.persistence.jdbc.driver";
+ public static final String DB_URL = "javax.persistence.jdbc.url";
+ public static final String DB_USER = "javax.persistence.jdbc.user";
+ public static final String DB_PWD = "javax.persistence.jdbc.password";
+
+ private static Properties properties = null;
+ /*
+ * Initialize the parameter values from the droolsPersitence.properties file values
+ *
+ * This is designed so that the Properties object is obtained from properties
+ * file and then is passed to this method to initialize the value of the parameters.
+ * This allows the flexibility of JUnit tests using getProperties(filename) to get the
+ * properties while runtime methods can use getPropertiesFromClassPath(filename).
+ *
+ */
+ public static void initProperties (Properties prop){
+ logger.info("ActiveStandbyProperties.initProperties(Properties): entry");
+ logger.info("\n\nActiveStandbyProperties.initProperties: Properties = \n{}\n\n", prop);
+
+ properties = prop;
+ }
+
+ public static String getProperty(String key){
+ return properties.getProperty(key);
+ }
+
+ public static Properties getProperties() {
+ return properties;
+ }
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdp.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdp.java
new file mode 100644
index 00000000..a440a7e1
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdp.java
@@ -0,0 +1,39 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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.util.Date;
+
+public interface DroolsPdp {
+
+ public String getPdpId();
+ public boolean isDesignated();
+ public int getPriority();
+ public Date getUpdatedDate();
+ public void setDesignated(boolean isDesignated);
+ public void setUpdatedDate(Date updatedDate);
+ public int comparePriority(DroolsPdp other);
+ public int comparePriority(DroolsPdp other,String previousSite);
+ public String getSiteName();
+ public void setSiteName(String siteName);
+ public Date getDesignatedDate();
+ public void setDesignatedDate(Date designatedDate);
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpEntity.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpEntity.java
new file mode 100644
index 00000000..ec1ce579
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpEntity.java
@@ -0,0 +1,137 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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.Serializable;
+import java.util.Date;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.NamedQueries;
+import javax.persistence.NamedQuery;
+import javax.persistence.Temporal;
+import javax.persistence.TemporalType;
+
+import org.onap.policy.drools.activestandby.DroolsPdpObject;
+
+@Entity
+//@Table(name="DroolsPdpEntity")
+
+@NamedQueries({
+ @NamedQuery(name="DroolsPdpEntity.findAll", query="SELECT e FROM DroolsPdpEntity e "),
+ @NamedQuery(name="DroolsPdpEntity.deleteAll", query="DELETE FROM DroolsPdpEntity WHERE 1=1")
+})
+public class DroolsPdpEntity extends DroolsPdpObject implements Serializable{
+
+ private static final long serialVersionUID = 1L;
+
+ @Id
+ @Column(name="pdpId", nullable=false)
+ private String pdpId="-1";
+
+ @Column(name="designated", nullable=false)
+ private boolean designated=false;
+
+ @Column(name="priority", nullable=false)
+ private int priority=0;
+
+ @Temporal(TemporalType.TIMESTAMP)
+ @Column(name="updatedDate", nullable=false)
+ private Date updatedDate;
+
+ @Temporal(TemporalType.TIMESTAMP)
+ @Column(name="designatedDate",nullable=false)
+ private Date designatedDate;
+
+ @Column(name="site", nullable=true, length = 50)
+ private String site;
+
+
+ public DroolsPdpEntity(){
+ updatedDate = new Date();
+ //When this is translated to a TimeStamp in MySQL, it assumes the date is relative
+ //to the local timezone. So, a value of Date(0) is actually Dec 31 18:00:00 CST 1969
+ //which is an invalid value for the MySql TimeStamp
+ designatedDate = new Date(864000000);
+ }
+
+ @Override
+ public String getPdpId() {
+ return this.pdpId;
+ }
+
+ public void setPdpId(String pdpId) {
+ this.pdpId = pdpId;
+ }
+
+ @Override
+ public boolean isDesignated() {
+ return this.designated;
+ }
+
+ @Override
+ public int getPriority() {
+ return this.priority;
+ }
+
+ public void setPriority(int priority) {
+ this.priority = priority;
+ }
+
+ @Override
+ public Date getUpdatedDate() {
+ return this.updatedDate;
+ }
+
+ @Override
+ public void setDesignated(boolean isDesignated) {
+ this.designated=isDesignated;
+ }
+
+ @Override
+ public void setUpdatedDate(Date updatedDate) {
+ this.updatedDate=updatedDate;
+ }
+
+
+ @Override
+ public String getSiteName() {
+ return site;
+ }
+
+ @Override
+ public void setSiteName(String siteName) {
+ site = siteName;
+
+ }
+
+ @Override
+ public Date getDesignatedDate() {
+ return designatedDate;
+ }
+
+ @Override
+ public void setDesignatedDate(Date designatedDate) {
+ this.designatedDate = designatedDate;
+ }
+
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpImpl.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpImpl.java
new file mode 100644
index 00000000..141d5857
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpImpl.java
@@ -0,0 +1,92 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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.util.Date;
+
+public class DroolsPdpImpl extends DroolsPdpObject {
+
+ private boolean designated;
+ private int priority;
+ private Date updatedDate;
+ private Date designatedDate;
+ private String pdpId;
+ private String site;
+
+ public DroolsPdpImpl(String pdpId, boolean designated, int priority, Date updatedDate){
+ this.pdpId = pdpId;
+ this.designated = designated;
+ this.priority = priority;
+ this.updatedDate = updatedDate;
+ //When this is translated to a TimeStamp in MySQL, it assumes the date is relative
+ //to the local timezone. So, a value of Date(0) is actually Dec 31 18:00:00 CST 1969
+ //which is an invalid value for the MySql TimeStamp
+ this.designatedDate = new Date(864000000);
+
+ }
+ @Override
+ public boolean isDesignated() {
+
+ return designated;
+ }
+
+ @Override
+ public int getPriority() {
+ return priority;
+ }
+ @Override
+ public void setUpdatedDate(Date date){
+ this.updatedDate = date;
+ }
+ @Override
+ public Date getUpdatedDate() {
+ return updatedDate;
+ }
+
+ @Override
+ public String getPdpId() {
+ return pdpId;
+ }
+ @Override
+ public void setDesignated(boolean isDesignated) {
+ this.designated = isDesignated;
+
+ }
+
+ @Override
+ public String getSiteName() {
+ return site;
+ }
+ @Override
+ public void setSiteName(String siteName) {
+ this.site = siteName;
+
+ }
+ @Override
+ public Date getDesignatedDate() {
+ return designatedDate;
+ }
+ @Override
+ public void setDesignatedDate(Date designatedDate) {
+ this.designatedDate = designatedDate;
+
+ }
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpObject.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpObject.java
new file mode 100644
index 00000000..e434c834
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpObject.java
@@ -0,0 +1,71 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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;
+
+
+public abstract class DroolsPdpObject implements DroolsPdp{
+
+ @Override
+ public boolean equals(Object other){
+ if(other instanceof DroolsPdp){
+ return this.getPdpId().equals(((DroolsPdp)other).getPdpId());
+ }else{
+ return false;
+ }
+ }
+ private int nullSafeCompare(String one, String two){
+ if(one != null && two != null){
+ return one.compareTo(two);
+ }
+ if(one == null && two != null){
+ return -1;
+ }
+ if(one != null && two == null){
+ return 1;
+ }
+ return 0;
+ }
+ @Override
+ public int comparePriority(DroolsPdp other){
+ if(nullSafeCompare(this.getSiteName(),other.getSiteName()) == 0){
+ if(this.getPriority() != other.getPriority()){
+ return this.getPriority() - other.getPriority();
+ }
+ return this.getPdpId().compareTo(other.getPdpId());
+ } else {
+ return nullSafeCompare(this.getSiteName(),other.getSiteName());
+ }
+ }
+ @Override
+ public int comparePriority(DroolsPdp other, String previousSite){
+ if(previousSite == null || previousSite.equals("")){
+ return comparePriority(other);
+ }
+ if(nullSafeCompare(this.getSiteName(),other.getSiteName()) == 0){
+ if(this.getPriority() != other.getPriority()){
+ return this.getPriority() - other.getPriority();
+ }
+ return this.getPdpId().compareTo(other.getPdpId());
+ } else {
+ return nullSafeCompare(this.getSiteName(),other.getSiteName());
+ }
+ }
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsConnector.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsConnector.java
new file mode 100644
index 00000000..d0d33f0f
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsConnector.java
@@ -0,0 +1,63 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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.util.Collection;
+
+public interface DroolsPdpsConnector {
+
+
+ //return a list of PDPs, NOT including this PDP
+ public Collection<DroolsPdp> getDroolsPdps();
+
+ public void update(DroolsPdp pdp);
+
+ //determines if the DroolsPdp parameter is considered "current" or expired (has it been too long since the Pdp sent an update)
+ public boolean isPdpCurrent(DroolsPdp pdp);
+
+ // Updates DESIGNATED boolean in PDP record.
+ public void setDesignated(DroolsPdp pdp, boolean designated);
+
+ // Marks droolspdpentity.DESIGNATED=false, so another PDP-D will go active.
+ public void standDownPdp(String pdpId);
+
+ // This is used in a JUnit test environment to manually
+ // insert a PDP
+ public void insertPdp(DroolsPdp pdp);
+
+ // This is used in a JUnit test environment to manually
+ // delete a PDP
+ public void deletePdp(String pdpId);
+
+ // This is used in a JUnit test environment to manually
+ // clear the droolspdpentity table.
+ public void deleteAllPdps();
+
+ // This is used in a JUnit test environment to manually
+ // get a PDP
+ public DroolsPdpEntity getPdp(String pdpId);
+
+ // Used by DroolsPdpsElectionHandler to determine if the currently designated
+ // PDP has failed.
+ public boolean hasDesignatedPdpFailed(Collection<DroolsPdp> pdps);
+
+
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java
new file mode 100644
index 00000000..6edf11f8
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java
@@ -0,0 +1,1076 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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.util.ArrayList;
+import java.util.Collection;
+import java.util.Date;
+import java.util.Timer;
+import java.util.TimerTask;
+
+import org.onap.policy.common.im.StateManagement;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.onap.policy.drools.statemanagement.StateManagementFeatureAPI;
+
+public class DroolsPdpsElectionHandler implements ThreadRunningChecker {
+ // get an instance of logger
+ private final static Logger logger = LoggerFactory.getLogger(DroolsPdpsElectionHandler.class);
+ private DroolsPdpsConnector pdpsConnector;
+ private Object pdpsConnectorLock = new Object();
+ private Object checkUpdateWorkerLock = new Object();
+ private Object checkWaitTimerLock = new Object();
+ private Object designationWaiterLock = new Object();
+
+ /*
+ * Must be static, so it can be referenced by JpaDroolsPdpsConnector,
+ * without requiring a reference to the election handler instantiation.
+ */
+ private static DroolsPdp myPdp;
+
+ private DesignationWaiter designationWaiter;
+ private Timer updateWorker;
+ private Timer waitTimer;
+ private Date updateWorkerLastRunDate;
+ private Date waitTimerLastRunDate;
+ private int pdpCheckInterval;
+ private int pdpUpdateInterval;
+ private volatile boolean isDesignated;
+
+ private String pdpdNowActive;
+ private String pdpdLastActive;
+
+ private StateManagementFeatureAPI stateManagementFeature;
+
+ public DroolsPdpsElectionHandler(DroolsPdpsConnector pdps, DroolsPdp myPdp){
+ pdpdNowActive = null;
+ pdpdLastActive = null;
+ this.pdpsConnector = pdps;
+ DroolsPdpsElectionHandler.myPdp = myPdp;
+ this.isDesignated = false;
+ pdpCheckInterval = 3000;
+ try{
+ pdpCheckInterval = Integer.parseInt(ActiveStandbyProperties.getProperty(ActiveStandbyProperties.PDP_CHECK_INVERVAL));
+ }catch(Exception e){
+ logger.error
+ ("Could not get pdpCheckInterval property. Using default", e);
+ }
+ pdpUpdateInterval = 2000;
+ try{
+ pdpUpdateInterval = Integer.parseInt(ActiveStandbyProperties.getProperty(ActiveStandbyProperties.PDP_UPDATE_INTERVAL));
+ }catch(Exception e){
+ logger.error
+ ("Could not get pdpUpdateInterval property. Using default", e);
+ }
+
+ Date now = new Date();
+
+ // Retrieve the ms since the epoch
+ long nowMs = now.getTime();
+
+ // Create the timer which will update the updateDate in DroolsPdpEntity table.
+ // This is the heartbeat
+ updateWorker = new Timer();
+
+ // Schedule the heartbeat to start in 100 ms and run at pdpCheckInterval ms thereafter
+ // NOTE: The first run of the TimerUpdateClass results in myPdp being added to the
+ // drools droolsPdpEntity table.
+ updateWorker.scheduleAtFixedRate(new TimerUpdateClass(), 100, pdpCheckInterval);
+ updateWorkerLastRunDate = new Date(nowMs + 100);
+
+ // Create the timer which will run the election algorithm
+ waitTimer = new Timer();
+
+ // Schedule it to start in startMs ms (so it will run after the updateWorker and run at pdpUpdateInterval ms thereafter
+ long startMs = getDWaiterStartMs();
+ designationWaiter = new DesignationWaiter();
+ waitTimer.scheduleAtFixedRate(designationWaiter, startMs, pdpUpdateInterval);
+ waitTimerLastRunDate = new Date(nowMs + startMs);
+
+ //Get the StateManagementFeature instance
+
+ for (StateManagementFeatureAPI feature : StateManagementFeatureAPI.impl.getList())
+ {
+ if (feature.getResourceName().equals(myPdp.getPdpId()))
+ {
+ if(logger.isDebugEnabled()){
+ logger.debug("DroolsPdpsElectionHandler: Found StateManagementFeature"
+ + " with resourceName: {}", myPdp.getPdpId());
+ }
+ stateManagementFeature = feature;
+ break;
+ }
+ }
+ if(stateManagementFeature == null){
+ logger.error("DroolsPdpsElectionHandler failed to initialize. "
+ + "Unable to get instance of StateManagementFeatureAPI "
+ + "with resourceID: {}", myPdp.getPdpId());
+ }
+ }
+
+ /*
+ * When the JpaDroolsPdpsConnector.standDown() method is invoked, it needs
+ * access to myPdp, so it can keep its designation status in sync with the
+ * DB.
+ */
+ public static void setMyPdpDesignated(boolean designated) {
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("setMyPdpDesignated: designated= {}", designated);
+ }
+ myPdp.setDesignated(designated);
+ }
+
+ private class DesignationWaiter extends TimerTask {
+ // get an instance of logger
+ private final Logger logger = LoggerFactory.getLogger(DesignationWaiter.class);
+
+ @Override
+ public void run() {
+ try{
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: Entering");
+ }
+
+ // just here initially so code still works
+ if (pdpsConnector == null) {
+ waitTimerLastRunDate = new Date();
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWaiter.run (pdpsConnector==null) waitTimerLastRunDate = {}", waitTimerLastRunDate);
+ }
+
+ return;
+ }
+
+ synchronized (designationWaiterLock) {
+
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: Entering synchronized block");
+ }
+
+ checkUpdateWorkerTimer();
+
+ //It is possible that multiple PDPs are designated lead. So, we will make a list of all designated
+ //PDPs and then decide which one really should be designated at the end.
+ ArrayList<DroolsPdp> listOfDesignated = new ArrayList<DroolsPdp>();
+
+ Collection<DroolsPdp> pdps = pdpsConnector.getDroolsPdps();
+ DroolsPdp designatedPdp = null;
+
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: pdps.size= {}", pdps.size());
+ }
+
+ //This is only true if all designated PDPs have failed
+ boolean designatedPdpHasFailed = pdpsConnector.hasDesignatedPdpFailed(pdps);
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: designatedPdpHasFailed= {}", designatedPdpHasFailed);
+ }
+ for (DroolsPdp pdp : pdps) {
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: evaluating pdp ID: {}", pdp.getPdpId());
+ }
+
+ /*
+ * Note: side effect of isPdpCurrent is that any stale but
+ * designated PDPs will be marked as un-designated.
+ */
+ boolean isCurrent = pdpsConnector.isPdpCurrent(pdp);
+
+ /*
+ * We can't use stateManagement.getStandbyStatus() here, because
+ * we need the standbyStatus, not for this PDP, but for the PDP
+ * being processed by this loop iteration.
+ */
+ String standbyStatus = stateManagementFeature.getStandbyStatus(pdp.getPdpId());
+ if(standbyStatus==null){
+ // Treat this case as a cold standby -- if we
+ // abort here, no sessions will be created in a
+ // single-node test environment.
+ standbyStatus = StateManagement.COLD_STANDBY;
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: PDP= {}, isCurrent= {}", pdp.getPdpId(), isCurrent);
+ }
+
+ /*
+ * There are 4 combinations of isDesignated and isCurrent. We will examine each one in-turn
+ * and evaluate the each pdp in the list of pdps against each combination.
+ *
+ * This is the first combination of isDesignated and isCurrent
+ */
+ if (pdp.isDesignated() && isCurrent) {
+ //It is current, but it could have a standbystatus=coldstandby / hotstandby
+ //If so, we need to stand it down and demote it
+ if(!standbyStatus.equals(StateManagement.PROVIDING_SERVICE)){
+ if(pdp.getPdpId().equals(myPdp.getPdpId())){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\n\nDesignatedWaiter.run: myPdp {} is current and designated, "
+ + "butstandbystatus is not providingservice. "
+ + " Executing stateManagement.demote()" + "\n\n", myPdp.getPdpId());
+ }
+ // So, we must demote it
+ try {
+ //Keep the order like this. StateManagement is last since it triggers controller shutdown
+ //This will change isDesignated and it can enter another if(combination) below
+ pdpsConnector.standDownPdp(pdp.getPdpId());
+ myPdp.setDesignated(false);
+ isDesignated = false;
+ if(!(standbyStatus.equals(StateManagement.HOT_STANDBY) ||
+ standbyStatus.equals(StateManagement.COLD_STANDBY))){
+ /*
+ * Only demote it if it appears it has not already been demoted. Don't worry
+ * about synching with the topic endpoint states. That is done by the
+ * refreshStateAudit
+ */
+ stateManagementFeature.demote();
+ }
+ //update the standbystatus to check in a later combination of isDesignated and isCurrent
+ standbyStatus=stateManagementFeature.getStandbyStatus(pdp.getPdpId());
+ } catch (Exception e) {
+ logger.error
+ ("DesignatedWaiter.run: myPdp: {} "
+ + "Caught Exception attempting to demote myPdp,"
+ + "message= {}", myPdp.getPdpId(), e.getMessage());
+ }
+ }else{
+ // Don't demote a remote PDP that is current. It should catch itself
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\n\nDesignatedWaiter.run: myPdp {} is current and designated, "
+ + "but standbystatus is not providingservice. "
+ + " Cannot execute stateManagement.demote() since it it is not myPdp\n\n", myPdp.getPdpId());
+ }
+ }
+
+ }else{
+ // If we get here, it is ok to be on the list
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: PDP= {} is designated, current and {} Noting PDP as "
+ + "designated, standbyStatus= {}", pdp.getPdpId(), standbyStatus, standbyStatus);
+ }
+ listOfDesignated.add(pdp);
+ }
+
+
+ }
+
+
+ /*
+ * The second combination of isDesignated and isCurrent
+ *
+ * PDP is designated but not current; it has failed. So we stand it down (it doesn't matter what
+ * its standbyStatus is). None of these go on the list.
+ */
+ if (pdp.isDesignated() && !isCurrent) {
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("INFO: DesignatedWaiter.run: PDP= {} is currently designated but is not current; "
+ + "it has failed. Standing down. standbyStatus= {}", pdp.getPdpId(), standbyStatus);
+ }
+ /*
+ * Changes designated to 0 but it is still potentially providing service
+ * Will affect isDesignated, so, it can enter an if(combination) below
+ */
+ pdpsConnector.standDownPdp(pdp.getPdpId());
+
+ //need to change standbystatus to coldstandby
+ if (pdp.getPdpId().equals(myPdp.getPdpId())){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\n\nDesignatedWaiter.run: myPdp {} is not Current. "
+ + " Executing stateManagement.disableFailed()\n\n", myPdp.getPdpId());
+ }
+ // We found that myPdp is designated but not current
+ // So, we must cause it to disableFail
+ try {
+ myPdp.setDesignated(false);
+ pdpsConnector.setDesignated(myPdp, false);
+ isDesignated = false;
+ stateManagementFeature.disableFailed();
+ } catch (Exception e) {
+ logger.error
+ ("DesignatedWaiter.run: myPdp: {} Caught Exception "
+ + "attempting to disableFail myPdp {}, message= {}",
+ myPdp.getPdpId(), myPdp.getPdpId(), e.getMessage());
+ }
+ } else { //it is a remote PDP that is failed
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\n\nDesignatedWaiter.run: PDP {} is not Current. "
+ + " Executing stateManagement.disableFailed(otherResourceName)\n\n", pdp.getPdpId() );
+ }
+ // We found a PDP is designated but not current
+ // We already called standdown(pdp) which will change designated to false
+ // Now we need to disableFail it to get its states in synch. The standbyStatus
+ // should equal coldstandby
+ try {
+ stateManagementFeature.disableFailed(pdp.getPdpId());
+ } catch (Exception e) {
+ logger.error
+ ("DesignatedWaiter.run: for PDP {} Caught Exception attempting to "
+ + "disableFail({}), message= {}",
+ pdp.getPdpId(), pdp.getPdpId(), e.getMessage());
+ }
+
+ }
+ continue; //we are not going to do anything else with this pdp
+ }
+
+ /*
+ * The third combination of isDesignated and isCurrent
+ * /*
+ * If a PDP is not currently designated but is providing service (erroneous, but recoverable) or hot standby
+ * we can add it to the list of possible designated if all the designated have failed
+ */
+ if (!pdp.isDesignated() && isCurrent){
+ if(!(standbyStatus.equals(StateManagement.HOT_STANDBY) ||
+ standbyStatus.equals(StateManagement.COLD_STANDBY))){
+ if(logger.isDebugEnabled()){
+ logger.debug("\n\nDesignatedWaiter.run: PDP {}"
+ + " is NOT designated but IS current and"
+ + " has a standbystatus= {}", pdp.getPdpId(), standbyStatus);
+ }
+ // Since it is current, we assume it can adjust its own state.
+ // We will demote if it is myPdp
+ if(pdp.getPdpId().equals(myPdp.getPdpId())){
+ //demote it
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWaiter.run: PDP {} going to "
+ + "setDesignated = false and calling stateManagement.demote", pdp.getPdpId());
+ }
+ try {
+ //Keep the order like this. StateManagement is last since it triggers controller shutdown
+ pdpsConnector.setDesignated(myPdp, false);
+ myPdp.setDesignated(false);
+ isDesignated = false;
+ //This is definitely not a redundant call. It is attempting to correct a problem
+ stateManagementFeature.demote();
+ //recheck the standbystatus
+ standbyStatus = stateManagementFeature.getStandbyStatus(pdp.getPdpId());
+ } catch (Exception e) {
+ logger.error
+ ("DesignatedWaiter.run: myPdp: {} Caught Exception "
+ + "attempting to demote myPdp {}, message = {}", myPdp.getPdpId(),
+ myPdp.getPdpId(), e.getMessage());
+ }
+
+ }
+ }
+ if(standbyStatus.equals(StateManagement.HOT_STANDBY) && designatedPdpHasFailed){
+ //add it to the list
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("INFO: DesignatedWaiter.run: PDP= {}"
+ + " is not designated but is {} and designated PDP "
+ + "has failed. standbyStatus= {}", pdp.getPdpId(),
+ standbyStatus, standbyStatus);
+ }
+ listOfDesignated.add(pdp);
+ }
+ continue; //done with this one
+ }
+
+ /*
+ * The fourth combination of isDesignated and isCurrent
+ *
+ * We are not going to put any of these on the list since it appears they have failed.
+
+ *
+ */
+ if(!pdp.isDesignated() && !isCurrent) {
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("INFO: DesignatedWaiter.run: PDP= {} "
+ + "designated= {}, current= {}, "
+ + "designatedPdpHasFailed= {}, "
+ + "standbyStatus= {}",pdp.getPdpId(),
+ pdp.isDesignated(), isCurrent, designatedPdpHasFailed, standbyStatus);
+ }
+ if(!standbyStatus.equals(StateManagement.COLD_STANDBY)){
+ //stand it down
+ //disableFail it
+ pdpsConnector.standDownPdp(pdp.getPdpId());
+ if(pdp.getPdpId().equals(myPdp.getPdpId())){
+ /*
+ * I don't actually know how this condition could happen, but if it did, we would want
+ * to declare it failed.
+ */
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\n\nDesignatedWaiter.run: myPdp {} is !current and !designated, "
+ + " Executing stateManagement.disableFailed()\n\n", myPdp.getPdpId());
+ }
+ // So, we must disableFail it
+ try {
+ //Keep the order like this. StateManagement is last since it triggers controller shutdown
+ pdpsConnector.setDesignated(myPdp, false);
+ myPdp.setDesignated(false);
+ isDesignated = false;
+ stateManagementFeature.disableFailed();
+ } catch (Exception e) {
+ logger.error
+ ("DesignatedWaiter.run: myPdp: {} Caught Exception attempting to "
+ + "disableFail myPdp {}, message= {}",
+ myPdp.getPdpId(), myPdp.getPdpId(), e.getMessage());
+ }
+ }else{//it is remote
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\n\nDesignatedWaiter.run: myPdp {} is !current and !designated, "
+ + " Executing stateManagement.disableFailed({})\n\n",
+ myPdp.getPdpId(), pdp.getPdpId());
+ }
+ // We already called standdown(pdp) which will change designated to false
+ // Now we need to disableFail it to get its states in sync. StandbyStatus = coldstandby
+ try {
+ stateManagementFeature.disableFailed(pdp.getPdpId());
+ } catch (Exception e) {
+ logger.error
+ ("DesignatedWaiter.run: for PDP {}"
+ + " Caught Exception attempting to disableFail({})"
+ + ", message=", pdp.getPdpId(), pdp.getPdpId(), e.getMessage());
+ }
+ }
+ }
+ }
+
+
+ } // end pdps loop
+
+ /*
+ * We have checked the four combinations of isDesignated and isCurrent. Where appropriate,
+ * we added the PDPs to the potential list of designated pdps
+ *
+ * We need to give priority to pdps on the same site that is currently being used
+ * First, however, we must sanitize the list of designated to make sure their are
+ * only designated members or non-designated members. There should not be both in
+ * the list. Because there are real time delays, it is possible that both types could
+ * be on the list.
+ */
+
+ listOfDesignated = santizeDesignatedList(listOfDesignated);
+
+ /*
+ * We need to figure out the last pdp that was the primary so we can get the last site
+ * name and the last session numbers. We need to create a "dummy" droolspdp since
+ * it will be used in later comparisons and cannot be null.
+ */
+
+ DroolsPdp mostRecentPrimary = computeMostRecentPrimary(pdps, listOfDesignated);
+
+ if(mostRecentPrimary != null){
+ pdpdLastActive = mostRecentPrimary.getPdpId();
+ }
+
+
+ /*
+ * It is possible to get here with more than one pdp designated and providingservice. This normally
+ * occurs when there is a race condition with multiple nodes coming up at the same time. If that is
+ * the case we must determine which one is the one that should be designated and which one should
+ * be demoted.
+ *
+ * It is possible to have 0, 1, 2 or more but not all, or all designated.
+ * If we have one designated and current, we chose it and are done
+ * If we have 2 or more, but not all, we must determine which one is in the same site as
+ * the previously designated pdp.
+ */
+
+ designatedPdp = computeDesignatedPdp(listOfDesignated, mostRecentPrimary);
+ if(designatedPdp != null){
+ pdpdNowActive = designatedPdp.getPdpId();
+ }
+
+ if (designatedPdp == null) {
+ logger.warn
+ ("WARNING: DesignatedWaiter.run: No viable PDP found to be Designated. designatedPdp still null.");
+ // Just to be sure the parameters are correctly set
+ myPdp.setDesignated(false);
+ pdpsConnector.setDesignated(myPdp,false);
+ isDesignated = false;
+
+ waitTimerLastRunDate = new Date();
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWaiter.run (designatedPdp == null) waitTimerLastRunDate = {}", waitTimerLastRunDate);
+ }
+
+ return;
+
+ } else if (designatedPdp.getPdpId().equals(myPdp.getPdpId())) {
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: designatedPdp is PDP={}", myPdp.getPdpId());
+ }
+ /*
+ * update function expects myPdp.isDesignated to be true.
+ */
+ try {
+ //Keep the order like this. StateManagement is last since it triggers controller init
+ myPdp.setDesignated(true);
+ myPdp.setDesignatedDate(new Date());
+ pdpsConnector.setDesignated(myPdp, true);
+ isDesignated = true;
+ String standbyStatus = stateManagementFeature.getStandbyStatus();
+ if(!standbyStatus.equals(StateManagement.PROVIDING_SERVICE)){
+ /*
+ * Only call promote if it is not already in the right state. Don't worry about
+ * synching the lower level topic endpoint states. That is done by the
+ * refreshStateAudit.
+ * Note that we need to fetch the session list from 'mostRecentPrimary'
+ * at this point -- soon, 'mostRecentPrimary' will be set to this host.
+ */
+ //this.sessions = mostRecentPrimary.getSessions();
+ stateManagementFeature.promote();
+ }
+ } catch (Exception e) {
+ logger.error
+ ("ERROR: DesignatedWaiter.run: Caught Exception attempting to promote PDP={}"
+ + ", message=", myPdp.getPdpId(), e.getMessage());
+ myPdp.setDesignated(false);
+ pdpsConnector.setDesignated(myPdp,false);
+ isDesignated = false;
+ //If you can't promote it, demote it
+ try {
+ String standbyStatus = stateManagementFeature.getStandbyStatus();
+ if(!(standbyStatus.equals(StateManagement.HOT_STANDBY) ||
+ standbyStatus.equals(StateManagement.COLD_STANDBY))){
+ /*
+ * Only call demote if it is not already in the right state. Don't worry about
+ * synching the lower level topic endpoint states. That is done by the
+ * refreshStateAudit.
+ */
+ stateManagementFeature.demote();
+ }
+ } catch (Exception e1) {
+ logger.error
+ ("ERROR: DesignatedWaiter.run: Caught StandbyStatusException "
+ + "attempting to promote then demote PDP={}, message=",
+ myPdp.getPdpId(), e1.getMessage());
+ }
+
+ }
+ waitTimerLastRunDate = new Date();
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWaiter.run (designatedPdp.getPdpId().equals(myPdp.getPdpId())) "
+ + "waitTimerLastRunDate = " + waitTimerLastRunDate);
+ }
+
+ return;
+ }
+ isDesignated = false;
+
+ } // end synchronized
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: myPdp: {}; Returning, isDesignated= {}",
+ isDesignated, myPdp.getPdpId());
+ }
+
+ Date tmpDate = new Date();
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWaiter.run (end of run) waitTimerLastRunDate = {}", tmpDate);
+ }
+
+ waitTimerLastRunDate = tmpDate;
+
+ }catch(Exception e){
+ logger.error("DesignatedWaiter.run caught an unexpected exception: ", e);
+ }
+ } // end run
+ }
+
+ public ArrayList<DroolsPdp> santizeDesignatedList(ArrayList<DroolsPdp> listOfDesignated){
+
+ boolean containsDesignated = false;
+ boolean containsHotStandby = false;
+ ArrayList<DroolsPdp> listForRemoval = new ArrayList<DroolsPdp>();
+ for(DroolsPdp pdp : listOfDesignated){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run sanitizing: pdp = {}"
+ + " isDesignated = {}",pdp.getPdpId(), pdp.isDesignated());
+ }
+ if(pdp.isDesignated()){
+ containsDesignated = true;
+ }else {
+ containsHotStandby = true;
+ listForRemoval.add(pdp);
+ }
+ }
+ if(containsDesignated && containsHotStandby){
+ //remove the hot standby from the list
+ listOfDesignated.removeAll(listForRemoval);
+ containsHotStandby = false;
+ }
+ return listOfDesignated;
+ }
+
+ public DroolsPdp computeMostRecentPrimary(Collection<DroolsPdp> pdps, ArrayList<DroolsPdp> listOfDesignated){
+ boolean containsDesignated = false;
+ for(DroolsPdp pdp : listOfDesignated){
+ if(pdp.isDesignated()){
+ containsDesignated = true;
+ }
+ }
+ DroolsPdp mostRecentPrimary = new DroolsPdpImpl(null, true, 1, new Date(0));
+ mostRecentPrimary.setSiteName(null);
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run listOfDesignated.size() = {}", listOfDesignated.size());
+ }
+ if(listOfDesignated.size() <=1){
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWainter.run: listOfDesignated.size <=1");
+ }
+ //Only one or none is designated or hot standby. Choose the latest designated date
+ for(DroolsPdp pdp : pdps){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run pdp = {}"
+ + " pdp.getDesignatedDate() = {}", pdp.getPdpId(), pdp.getDesignatedDate());
+ }
+ if(pdp.getDesignatedDate().compareTo(mostRecentPrimary.getDesignatedDate()) > 0){
+ mostRecentPrimary = pdp;
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run mostRecentPrimary = {}", mostRecentPrimary.getPdpId());
+ }
+ }
+ }
+ }else if(listOfDesignated.size() == pdps.size()){
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWainter.run: listOfDesignated.size = pdps.size() which is {}", pdps.size());
+ }
+ //They are all designated or all hot standby.
+ mostRecentPrimary = null;
+ for(DroolsPdp pdp : pdps){
+ if(mostRecentPrimary == null){
+ mostRecentPrimary = pdp;
+ continue;
+ }
+ if(containsDesignated){ //Choose the site of the first designated date
+ if(pdp.getDesignatedDate().compareTo(mostRecentPrimary.getDesignatedDate()) < 0){
+ mostRecentPrimary = pdp;
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run mostRecentPrimary = {}", mostRecentPrimary.getPdpId());
+ }
+ }
+ }else{ //Choose the site with the latest designated date
+ if(pdp.getDesignatedDate().compareTo(mostRecentPrimary.getDesignatedDate()) > 0){
+ mostRecentPrimary = pdp;
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run mostRecentPrimary = {}", mostRecentPrimary.getPdpId());
+ }
+ }
+ }
+ }
+ }else{
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWainter.run: Some but not all are designated or hot standby. ");
+ }
+ //Some but not all are designated or hot standby.
+ if(containsDesignated){
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWainter.run: containsDesignated = {}", containsDesignated);
+ }
+ /*
+ * The list only contains designated. This is a problem. It is most likely a race
+ * condition that resulted in two thinking they should be designated. Choose the
+ * site with the latest designated date for the pdp not included on the designated list.
+ * This should be the site that had the last designation before this race condition
+ * occurred.
+ */
+ for(DroolsPdp pdp : pdps){
+ if(listOfDesignated.contains(pdp)){
+ continue; //Don't consider this entry
+ }
+ if(pdp.getDesignatedDate().compareTo(mostRecentPrimary.getDesignatedDate()) > 0){
+ mostRecentPrimary = pdp;
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run mostRecentPrimary = {}", mostRecentPrimary.getPdpId());
+ }
+ }
+ }
+ }else{
+ if(logger.isDebugEnabled()){
+ logger.debug("DesignatedWainter.run: containsDesignated = {}", containsDesignated);
+ }
+ //The list only contains hot standby. Choose the site of the latest designated date
+ for(DroolsPdp pdp : pdps){
+ if(pdp.getDesignatedDate().compareTo(mostRecentPrimary.getDesignatedDate()) > 0){
+ mostRecentPrimary = pdp;
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run mostRecentPrimary = {}", mostRecentPrimary.getPdpId());
+ }
+ }
+ }
+ }
+ }
+ return mostRecentPrimary;
+ }
+
+ public DroolsPdp computeDesignatedPdp(ArrayList<DroolsPdp> listOfDesignated, DroolsPdp mostRecentPrimary){
+ DroolsPdp designatedPdp = null;
+ DroolsPdp lowestPriorityPdp = null;
+ if(listOfDesignated.size() > 1){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("DesignatedWaiter.run: myPdp: {} listOfDesignated.size(): {}", myPdp.getPdpId(), listOfDesignated.size());
+ }
+ DroolsPdp rejectedPdp = null;
+ DroolsPdp lowestPrioritySameSite = null;
+ DroolsPdp lowestPriorityDifferentSite = null;
+ for(DroolsPdp pdp : listOfDesignated){
+ // We need to determine if another PDP is the lowest priority
+ if(nullSafeEquals(pdp.getSiteName(),mostRecentPrimary.getSiteName())){
+ if(lowestPrioritySameSite == null){
+ if(lowestPriorityDifferentSite != null){
+ rejectedPdp = lowestPriorityDifferentSite;
+ }
+ lowestPrioritySameSite = pdp;
+ }else{
+ if(pdp.getPdpId().equals((lowestPrioritySameSite.getPdpId()))){
+ continue;//nothing to compare
+ }
+ if(pdp.comparePriority(lowestPrioritySameSite) <0){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\nDesignatedWaiter.run: myPdp {} listOfDesignated pdp ID: {}"
+ + " has lower priority than pdp ID: {}",myPdp.getPdpId(), pdp.getPdpId(),
+ lowestPrioritySameSite.getPdpId());
+ }
+ //we need to reject lowestPrioritySameSite
+ rejectedPdp = lowestPrioritySameSite;
+ lowestPrioritySameSite = pdp;
+ } else{
+ //we need to reject pdp and keep lowestPrioritySameSite
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\nDesignatedWaiter.run: myPdp {} listOfDesignated pdp ID: {} "
+ + " has higher priority than pdp ID: {}", myPdp.getPdpId(),pdp.getPdpId(),
+ lowestPrioritySameSite.getPdpId());
+ }
+ rejectedPdp = pdp;
+ }
+ }
+ } else{
+ if(lowestPrioritySameSite != null){
+ //if we already have a candidate for same site, we don't want to bother with different sites
+ rejectedPdp = pdp;
+ } else{
+ if(lowestPriorityDifferentSite == null){
+ lowestPriorityDifferentSite = pdp;
+ continue;
+ }
+ if(pdp.getPdpId().equals((lowestPriorityDifferentSite.getPdpId()))){
+ continue;//nothing to compare
+ }
+ if(pdp.comparePriority(lowestPriorityDifferentSite) <0){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\nDesignatedWaiter.run: myPdp {} listOfDesignated pdp ID: {}"
+ + " has lower priority than pdp ID: {}", myPdp.getPdpId(), pdp.getPdpId(),
+ lowestPriorityDifferentSite.getPdpId());
+ }
+ //we need to reject lowestPriorityDifferentSite
+ rejectedPdp = lowestPriorityDifferentSite;
+ lowestPriorityDifferentSite = pdp;
+ } else{
+ //we need to reject pdp and keep lowestPriorityDifferentSite
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\nDesignatedWaiter.run: myPdp {} listOfDesignated pdp ID: {}"
+ + " has higher priority than pdp ID: {}", myPdp.getPdpId(), pdp.getPdpId(),
+ lowestPriorityDifferentSite.getPdpId());
+ }
+ rejectedPdp = pdp;
+ }
+ }
+ }
+ // If the rejectedPdp is myPdp, we need to stand it down and demote it. Each pdp is responsible
+ // for demoting itself
+ if(rejectedPdp != null && nullSafeEquals(rejectedPdp.getPdpId(),myPdp.getPdpId())){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\n\nDesignatedWaiter.run: myPdp: {} listOfDesignated myPdp ID: {}"
+ + " is NOT the lowest priority. Executing stateManagement.demote()\n\n", myPdp.getPdpId(),
+ myPdp.getPdpId());
+ }
+ // We found that myPdp is on the listOfDesignated and it is not the lowest priority
+ // So, we must demote it
+ try {
+ //Keep the order like this. StateManagement is last since it triggers controller shutdown
+ myPdp.setDesignated(false);
+ pdpsConnector.setDesignated(myPdp, false);
+ isDesignated = false;
+ String standbyStatus = stateManagementFeature.getStandbyStatus();
+ if(!(standbyStatus.equals(StateManagement.HOT_STANDBY) ||
+ standbyStatus.equals(StateManagement.COLD_STANDBY))){
+ /*
+ * Only call demote if it is not already in the right state. Don't worry about
+ * synching the lower level topic endpoint states. That is done by the
+ * refreshStateAudit.
+ */
+ stateManagementFeature.demote();
+ }
+ } catch (Exception e) {
+ myPdp.setDesignated(false);
+ pdpsConnector.setDesignated(myPdp, false);
+ isDesignated = false;
+ logger.error
+ ("DesignatedWaiter.run: myPdp: {} Caught Exception attempting to "
+ + "demote myPdp {} myPdp.getPdpId(), message= {}", myPdp.getPdpId(),
+ e.getMessage());
+ }
+ }
+ } //end: for(DroolsPdp pdp : listOfDesignated)
+ if(lowestPrioritySameSite != null){
+ lowestPriorityPdp = lowestPrioritySameSite;
+ } else {
+ lowestPriorityPdp = lowestPriorityDifferentSite;
+ }
+ //now we have a valid value for lowestPriorityPdp
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\n\nDesignatedWaiter.run: myPdp: {} listOfDesignated "
+ + "found the LOWEST priority pdp ID: {} "
+ + " It is now the designatedPpd from the perspective of myPdp ID: {} \n\n",
+ myPdp.getPdpId(), lowestPriorityPdp.getPdpId(), myPdp);
+ }
+ designatedPdp = lowestPriorityPdp;
+
+ } else if(listOfDesignated.isEmpty()){
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\nDesignatedWaiter.run: myPdp: {} listOfDesignated is: EMPTY.", myPdp.getPdpId());
+ }
+ designatedPdp = null;
+ } else{ //only one in listOfDesignated
+ if(logger.isDebugEnabled()){
+ logger.debug
+ ("\nDesignatedWaiter.run: myPdp: {} listOfDesignated "
+ + "has ONE entry. PDP ID: {}", myPdp.getPdpId(), listOfDesignated.get(0).getPdpId());
+ }
+ designatedPdp = listOfDesignated.get(0);
+ }
+ return designatedPdp;
+
+ }
+
+ private class TimerUpdateClass extends TimerTask{
+
+ @Override
+ public void run() {
+ try{
+ if(logger.isDebugEnabled()){
+ logger.debug("TimerUpdateClass.run: entry");
+ }
+ checkWaitTimer();
+ synchronized(pdpsConnectorLock){
+
+ myPdp.setUpdatedDate(new Date());
+ /*
+ Redundant with DesignationWaiter and this updates the date every
+ cycle instead of just when the state changes.
+ if(myPdp.isDesignated()){
+ myPdp.setDesignatedDate(new Date());
+ }
+ */
+ pdpsConnector.update(myPdp);
+
+ Date tmpDate = new Date();
+ if(logger.isDebugEnabled()){
+ logger.debug("TimerUpdateClass.run: updateWorkerLastRunDate = {}", tmpDate);
+ }
+
+ updateWorkerLastRunDate = tmpDate;
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("TimerUpdateClass.run.exit");
+ }
+ }catch(Exception e){
+ logger.error("TimerUpdateClass.run caught an unexpected exception: ", e);
+ }
+ }
+ }
+ @Override
+ public void checkThreadStatus() {
+ checkUpdateWorkerTimer();
+ checkWaitTimer();
+ }
+
+ private void checkUpdateWorkerTimer(){
+ synchronized(checkUpdateWorkerLock){
+ try{
+ if(logger.isDebugEnabled()){
+ logger.debug("checkUpdateWorkerTimer: entry");
+ }
+ Date now = new Date();
+ long nowMs = now.getTime();
+ long updateWorkerMs = updateWorkerLastRunDate.getTime();
+ //give it 2 second cushion
+ if((nowMs - updateWorkerMs) > pdpCheckInterval + 2000){
+ logger.error("checkUpdateWorkerTimer: nowMs - updateWorkerMs = {} "
+ + ", exceeds pdpCheckInterval + 2000 = {} "
+ + "Will reschedule updateWorker timer",(nowMs - updateWorkerMs), (pdpCheckInterval + 2000));
+
+ try{
+ updateWorker.cancel();
+ // Recalculate the time because this is a synchronized section and the thread could have
+ // been blocked.
+ now = new Date();
+ nowMs = now.getTime();
+ updateWorker = new Timer();
+ // reset the updateWorkerLastRunDate
+ updateWorkerLastRunDate = new Date(nowMs + 100);
+ //execute the first time in 100 ms
+ updateWorker.scheduleAtFixedRate(new TimerUpdateClass(), 100, pdpCheckInterval);
+ if(logger.isDebugEnabled()){
+ logger.debug("checkUpdateWorkerTimer: Scheduling updateWorker timer to start in 100 ms ");
+ }
+ }catch(Exception e){
+ logger.error("checkUpdateWorkerTimer: Caught unexpected Exception: ", e);
+ // Recalculate the time because this is a synchronized section and the thread could have
+ // been blocked.
+ now = new Date();
+ nowMs = now.getTime();
+ updateWorker = new Timer();
+ updateWorkerLastRunDate = new Date(nowMs + 100);
+ updateWorker.scheduleAtFixedRate(new TimerUpdateClass(), 100, pdpCheckInterval);
+ if(logger.isDebugEnabled()){
+ logger.debug("checkUpdateWorkerTimer: Attempting to schedule updateWorker timer in 100 ms");
+ }
+ }
+
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("checkUpdateWorkerTimer: exit");
+ }
+ }catch(Exception e){
+ logger.error("checkUpdateWorkerTimer: caught unexpected exception: ", e);
+ }
+ }
+ }
+
+ private void checkWaitTimer(){
+ synchronized(checkWaitTimerLock){
+ try{
+ if(logger.isDebugEnabled()){
+ logger.debug("checkWaitTimer: entry");
+ }
+ Date now = new Date();
+ long nowMs = now.getTime();
+ long waitTimerMs = waitTimerLastRunDate.getTime();
+
+ //give it 2 times leeway
+ if((nowMs - waitTimerMs) > 2*pdpUpdateInterval){
+ logger.error("checkWaitTimer: nowMs - waitTimerMs = {}"
+ + ", exceeds pdpUpdateInterval + 2000 = {}"
+ + "Will reschedule waitTimer timer", (nowMs - waitTimerMs), (2*pdpUpdateInterval));
+
+ try{
+ // Recalculate since the thread could have been stalled on the synchronize()
+ nowMs = (new Date()).getTime();
+ // Time to the start of the next pdpUpdateInterval multiple
+ long startMs = getDWaiterStartMs();
+ waitTimer.cancel();
+ designationWaiter = new DesignationWaiter();
+ waitTimer = new Timer();
+ waitTimerLastRunDate = new Date(nowMs + startMs);
+ waitTimer.scheduleAtFixedRate(designationWaiter, startMs, pdpUpdateInterval);
+ if(logger.isDebugEnabled()){
+ logger.debug("checkWaitTimer: Scheduling waitTimer timer to start in {} ms", startMs);
+ }
+ }catch(Exception e){
+ logger.error("checkWaitTimer: Caught unexpected Exception: ", e);
+ // Recalculate since the thread could have been stalled on the synchronize()
+ nowMs = (new Date()).getTime();
+ // Time to the start of the next pdpUpdateInterval multiple
+ long startMs = getDWaiterStartMs();
+ designationWaiter = new DesignationWaiter();
+ waitTimer = new Timer();
+ waitTimerLastRunDate = new Date(nowMs + startMs);
+ waitTimer.scheduleAtFixedRate(designationWaiter, startMs, pdpUpdateInterval);
+ if(logger.isDebugEnabled()){
+ logger.debug("checkWaitTimer: Scheduling waitTimer timer in {} ms", startMs);
+ }
+ }
+
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("checkWaitTimer: exit");
+ }
+ }catch(Exception e){
+ logger.error("checkWaitTimer: caught unexpected exception: ", e);
+ }
+ }
+ }
+
+ private long getDWaiterStartMs(){
+ Date now = new Date();
+
+ // Retrieve the ms since the epoch
+ long nowMs = now.getTime();
+
+ // Time since the end of the last pdpUpdateInterval multiple
+ long nowModMs = nowMs % pdpUpdateInterval;
+
+ // Time to the start of the next pdpUpdateInterval multiple
+ long startMs = 2*pdpUpdateInterval - nowModMs;
+
+ // Give the start time a minimum of a 5 second cushion
+ if(startMs < 5000){
+ // Start at the beginning of following interval
+ startMs = pdpUpdateInterval + startMs;
+ }
+ return startMs;
+ }
+
+ private boolean nullSafeEquals(Object one, Object two){
+ if(one == null && two == null){
+ return true;
+ }
+ if(one != null && two != null){
+ return one.equals(two);
+ }
+ return false;
+ }
+
+ public String getPdpdNowActive(){
+ return pdpdNowActive;
+ }
+
+ public String getPdpdLastActive(){
+ return pdpdLastActive;
+ }
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/JpaDroolsPdpsConnector.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/JpaDroolsPdpsConnector.java
new file mode 100644
index 00000000..0d931acc
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/JpaDroolsPdpsConnector.java
@@ -0,0 +1,636 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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.util.Collection;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.FlushModeType;
+import javax.persistence.LockModeType;
+import javax.persistence.Query;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class JpaDroolsPdpsConnector implements DroolsPdpsConnector {
+
+ // get an instance of logger
+ private static final Logger logger = LoggerFactory.getLogger(JpaDroolsPdpsConnector.class);
+ private EntityManagerFactory emf;
+
+
+ //not sure if we want to use the same entity manager factory for drools session and pass it in here, or create a new one
+ public JpaDroolsPdpsConnector(EntityManagerFactory emf){
+ this.emf = emf;
+ }
+ @Override
+ public Collection<DroolsPdp> getDroolsPdps() {
+ //return a list of all the DroolsPdps in the database
+ EntityManager em = emf.createEntityManager();
+ try {
+ em.getTransaction().begin();
+ Query droolsPdpsListQuery = em.createQuery("SELECT p FROM DroolsPdpEntity p");
+ List<?> droolsPdpsList = droolsPdpsListQuery.setLockMode(LockModeType.NONE).setFlushMode(FlushModeType.COMMIT).getResultList();
+ LinkedList<DroolsPdp> droolsPdpsReturnList = new LinkedList<DroolsPdp>();
+ for(Object o : droolsPdpsList){
+ if(o instanceof DroolsPdp){
+ //Make sure it is not a cached version
+ em.refresh((DroolsPdpEntity)o);
+ droolsPdpsReturnList.add((DroolsPdp)o);
+ if (logger.isDebugEnabled()) {
+ DroolsPdp droolsPdp = (DroolsPdp)o;
+ logger.debug("getDroolsPdps: PDP= {}"
+ + ", isDesignated= {}"
+ + ", updatedDate= {}"
+ + ", priority= {}", droolsPdp.getPdpId(), droolsPdp.isDesignated(),
+ droolsPdp.getUpdatedDate(), droolsPdp.getPriority());
+ }
+ }
+ }
+ try{
+ em.getTransaction().commit();
+ }catch(Exception e){
+ logger.error
+ ("Cannot commit getDroolsPdps() transaction", e);
+ }
+ return droolsPdpsReturnList;
+ } finally {
+ cleanup(em, "getDroolsPdps");
+ }
+ }
+
+ private boolean nullSafeEquals(Object one, Object two){
+ if(one == null && two == null){
+ return true;
+ }
+ if(one != null && two != null){
+ return one.equals(two);
+ }
+ return false;
+ }
+
+ @Override
+ public void update(DroolsPdp pdp) {
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("update: Entering, pdpId={}", pdp.getPdpId());
+ }
+
+ //this is to update our own pdp in the database
+ EntityManager em = emf.createEntityManager();
+ try {
+ em.getTransaction().begin();
+ Query droolsPdpsListQuery = em.createQuery("SELECT p FROM DroolsPdpEntity p WHERE p.pdpId=:pdpId");
+ droolsPdpsListQuery.setParameter("pdpId", pdp.getPdpId());
+ List<?> droolsPdpsList = droolsPdpsListQuery.setLockMode(LockModeType.NONE).setFlushMode(FlushModeType.COMMIT).getResultList();
+ DroolsPdpEntity droolsPdpEntity;
+ if(droolsPdpsList.size() == 1 && (droolsPdpsList.get(0) instanceof DroolsPdpEntity)){
+ droolsPdpEntity = (DroolsPdpEntity)droolsPdpsList.get(0);
+ em.refresh(droolsPdpEntity); //Make sure we have current values
+ Date currentDate = new Date();
+ long difference = currentDate.getTime()-droolsPdpEntity.getUpdatedDate().getTime();
+ //just set some kind of default here
+ long pdpTimeout = 15000;
+ try{
+ pdpTimeout = Long.parseLong(ActiveStandbyProperties.getProperty(ActiveStandbyProperties.PDP_TIMEOUT));
+ }catch(Exception e){
+ logger.error
+ ("Could not get PDP timeout property, using default.", e);
+ }
+ boolean isCurrent = difference<pdpTimeout;
+ if (logger.isDebugEnabled()) {
+ logger.debug("update: PDP= {}, isCurrent={}"
+ + " difference= {}"
+ + ", pdpTimeout= {}, designated= {}",
+ pdp.getPdpId(), isCurrent, difference, pdpTimeout, droolsPdpEntity.isDesignated());
+ }
+ } else {
+ if (logger.isDebugEnabled()) {
+ logger.debug("update: For PDP={}"
+ + ", instantiating new DroolsPdpEntity", pdp.getPdpId());
+ }
+ droolsPdpEntity = new DroolsPdpEntity();
+ em.persist(droolsPdpEntity);
+ droolsPdpEntity.setPdpId(pdp.getPdpId());
+ }
+ if(droolsPdpEntity.getPriority() != pdp.getPriority()){
+ droolsPdpEntity.setPriority(pdp.getPriority());
+ }
+ if(!droolsPdpEntity.getUpdatedDate().equals(pdp.getUpdatedDate())){
+ droolsPdpEntity.setUpdatedDate(pdp.getUpdatedDate());
+ }
+ /*if(!droolsPdpEntity.getDesignatedDate().equals(pdp.getDesignatedDate())){
+ droolsPdpEntity.setDesignatedDate(pdp.getDesignatedDate());
+ } The designated date is only set below when this first becomes designated*/
+ if(!nullSafeEquals(droolsPdpEntity.getSiteName(),pdp.getSiteName())){
+ droolsPdpEntity.setSiteName(pdp.getSiteName());
+ }
+
+ if(droolsPdpEntity.isDesignated() != pdp.isDesignated()){
+ if (logger.isDebugEnabled()) {
+ logger.debug("update: pdpId={}"
+ + ", pdp.isDesignated={}"
+ + ", droolsPdpEntity.pdpId= {}"
+ + ", droolsPdpEntity.isDesignated={}",
+ pdp.getPdpId(), pdp.isDesignated(),droolsPdpEntity.getPdpId(), droolsPdpEntity.isDesignated());
+ }
+ droolsPdpEntity.setDesignated(pdp.isDesignated());
+ //The isDesignated value is not the same and the new one == true
+ if(pdp.isDesignated()){
+ droolsPdpEntity.setDesignatedDate(new Date());
+ }
+ }
+ em.getTransaction().commit();
+ } finally {
+ cleanup(em, "update");
+ }
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("update: Exiting");
+ }
+
+ }
+
+ /*
+ * Note: A side effect of this boolean method is that if the PDP is designated but not current, the
+ * droolspdpentity.DESIGNATED column will be set to false (the PDP will be un-designated, i.e. marked as
+ * being in standby mode)
+ */
+ @Override
+ public boolean isPdpCurrent(DroolsPdp pdp) {
+
+ boolean isCurrent = isCurrent(pdp);
+
+ EntityManager em = emf.createEntityManager();
+ try{
+ if(!isCurrent && pdp.isDesignated()){
+ em.getTransaction().begin();
+ Query droolsPdpsListQuery = em.createQuery("SELECT p FROM DroolsPdpEntity p WHERE p.pdpId=:pdpId");
+ droolsPdpsListQuery.setParameter("pdpId", pdp.getPdpId());
+ List<?> droolsPdpsList = droolsPdpsListQuery.setLockMode(LockModeType.NONE).setFlushMode(FlushModeType.COMMIT).getResultList();
+ if(droolsPdpsList.size() == 1 && droolsPdpsList.get(0) instanceof DroolsPdpEntity){
+ if (logger.isDebugEnabled()) {
+ logger.debug("isPdpCurrent: PDP={} designated but not current; setting designated to false", pdp.getPdpId());
+ }
+ DroolsPdpEntity droolsPdpEntity = (DroolsPdpEntity)droolsPdpsList.get(0);
+ droolsPdpEntity.setDesignated(false);
+ em.getTransaction().commit();
+ } else {
+ logger.warn("isPdpCurrent: PDP={} is designated but not current; "
+ + "however it does not have a DB entry, so cannot set DESIGNATED to false!", pdp.getPdpId());
+ }
+ } else {
+ if (logger.isDebugEnabled()) {
+ logger.debug("isPdpCurrent: For PDP= {}, "
+ + "designated={}, isCurrent={}", pdp.getPdpId(), pdp.isDesignated(), isCurrent);
+ }
+ }
+ }catch(Exception e){
+ logger.error
+ ("Could not update expired record marked as designated in the database", e);
+ } finally {
+ cleanup(em, "isPdpCurrent");
+ }
+ return isCurrent;
+
+ }
+
+ @Override
+ public void setDesignated(DroolsPdp pdp, boolean designated) {
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("setDesignated: Entering, pdpId={}"
+ + ", designated={}", pdp.getPdpId(), designated);
+ }
+
+ EntityManager em = null;
+ try {
+ em = emf.createEntityManager();
+ em.getTransaction().begin();
+ Query droolsPdpsListQuery = em
+ .createQuery("SELECT p FROM DroolsPdpEntity p WHERE p.pdpId=:pdpId");
+ droolsPdpsListQuery.setParameter("pdpId", pdp.getPdpId());
+ List<?> droolsPdpsList = droolsPdpsListQuery.setLockMode(
+ LockModeType.NONE).setFlushMode(FlushModeType.COMMIT).getResultList();
+ if (droolsPdpsList.size() == 1
+ && droolsPdpsList.get(0) instanceof DroolsPdpEntity) {
+ DroolsPdpEntity droolsPdpEntity = (DroolsPdpEntity) droolsPdpsList
+ .get(0);
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("setDesignated: PDP={}"
+ + " found, designated= {}"
+ + ", setting to {}", pdp.getPdpId(), droolsPdpEntity.isDesignated(),
+ designated);
+ }
+ droolsPdpEntity.setDesignated(designated);
+ if(designated){
+ em.refresh(droolsPdpEntity); //make sure we get the DB value
+ if(!droolsPdpEntity.isDesignated()){
+ droolsPdpEntity.setDesignatedDate(new Date());
+ }
+
+ }
+ em.getTransaction().commit();
+ } else {
+ logger.error("setDesignated: PDP={}"
+ + " not in DB; cannot update designation", pdp.getPdpId());
+ }
+ } catch (Exception e) {
+ logger.error("setDesignated: Caught Exception", e);
+ } finally {
+ cleanup(em, "setDesignated");
+ }
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("setDesignated: Exiting");
+ }
+
+ }
+
+
+ @Override
+ public void standDownPdp(String pdpId) {
+ if(logger.isDebugEnabled()){
+ logger.debug("standDownPdp: Entering, pdpId={}", pdpId);
+ }
+
+ EntityManager em = null;
+ try {
+ /*
+ * Start transaction.
+ */
+ em = emf.createEntityManager();
+ em.getTransaction().begin();
+
+ /*
+ * Get droolspdpentity record for this PDP and mark DESIGNATED as
+ * false.
+ */
+ Query droolsPdpsListQuery = em
+ .createQuery("SELECT p FROM DroolsPdpEntity p WHERE p.pdpId=:pdpId");
+ droolsPdpsListQuery.setParameter("pdpId", pdpId);
+ List<?> droolsPdpsList = droolsPdpsListQuery.setLockMode(
+ LockModeType.NONE).setFlushMode(FlushModeType.COMMIT).getResultList();
+ DroolsPdpEntity droolsPdpEntity;
+ if (droolsPdpsList.size() == 1
+ && (droolsPdpsList.get(0) instanceof DroolsPdpEntity)) {
+ droolsPdpEntity = (DroolsPdpEntity) droolsPdpsList.get(0);
+ droolsPdpEntity.setDesignated(false);
+ em.persist(droolsPdpEntity);
+ if(logger.isDebugEnabled()){
+ logger.debug("standDownPdp: PDP={} persisted as non-designated.", pdpId );
+ }
+ } else {
+ logger.error("standDownPdp: Missing record in droolspdpentity for pdpId={}"
+ + "; cannot stand down PDP", pdpId);
+ }
+
+ /*
+ * End transaction.
+ */
+ em.getTransaction().commit();
+ cleanup(em, "standDownPdp");
+ em = null;
+
+ // Keep the election handler in sync with the DB
+ DroolsPdpsElectionHandler.setMyPdpDesignated(false);
+
+ } catch (Exception e) {
+ logger.error("standDownPdp: Unexpected Exception attempting to mark "
+ + "DESIGNATED as false for droolspdpentity, pdpId={}"
+ + ". Cannot stand down PDP; message={}", pdpId, e.getMessage(), e);
+ } finally {
+ cleanup(em, "standDownPdp");
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("standDownPdp: Exiting");
+ }
+
+ }
+
+ /*
+ * Determines whether or not a designated PDP has failed.
+ *
+ * Note: The update method, which is run periodically by the
+ * TimerUpdateClass, will un-designate a PDP that is stale.
+ */
+ @Override
+ public boolean hasDesignatedPdpFailed(Collection<DroolsPdp> pdps) {
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("hasDesignatedPdpFailed: Entering, pdps.size()={}", pdps.size());
+ }
+
+ boolean failed = true;
+ boolean foundDesignatedPdp = false;
+
+ for (DroolsPdp pdp : pdps) {
+
+ /*
+ * Normally, the update method will un-designate any stale PDP, but
+ * we check here to see if the PDP has gone stale since the update
+ * method was run.
+ *
+ * Even if we determine that the designated PDP is current, we keep
+ * going (we don't break), so we can get visibility into the other
+ * PDPs, when in DEBUG mode.
+ */
+ if (pdp.isDesignated() && isCurrent(pdp)) {
+ if (logger.isDebugEnabled()) {
+ logger.debug("hasDesignatedPdpFailed: Designated PDP={} is current", pdp.getPdpId());
+ }
+ failed = false;
+ foundDesignatedPdp = true;
+ } else if (pdp.isDesignated() && !isCurrent(pdp)) {
+ logger.error("hasDesignatedPdpFailed: Designated PDP={} has failed", pdp.getPdpId());
+ foundDesignatedPdp = true;
+ } else {
+ if (logger.isDebugEnabled()) {
+ logger.debug("hasDesignatedPdpFailed: PDP={} is not designated", pdp.getPdpId());
+ }
+ }
+ }
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("hasDesignatedPdpFailed: Exiting and returning, foundDesignatedPdp={}",
+ foundDesignatedPdp);
+ }
+ return failed;
+ }
+
+
+ private boolean isCurrent(DroolsPdp pdp) {
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("isCurrent: Entering, pdpId={}", pdp.getPdpId());
+ }
+
+ boolean current = false;
+
+ // Return if the current PDP is considered "current" based on whatever
+ // time box that may be.
+ // If the the PDP is not current, we should mark it as not primary in
+ // the database
+ Date currentDate = new Date();
+ long difference = currentDate.getTime()
+ - pdp.getUpdatedDate().getTime();
+ // just set some kind of default here
+ long pdpTimeout = 15000;
+ try {
+ pdpTimeout = Long.parseLong(ActiveStandbyProperties
+ .getProperty(ActiveStandbyProperties.PDP_TIMEOUT));
+ if (logger.isDebugEnabled()) {
+ logger.debug("isCurrent: pdp.timeout={}", pdpTimeout);
+ }
+ } catch (Exception e) {
+ logger.error
+ ("isCurrent: Could not get PDP timeout property, using default.", e);
+ }
+ current = difference < pdpTimeout;
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("isCurrent: Exiting, difference={}, pdpTimeout={}"
+ + "; returning current={}", difference, pdpTimeout, current);
+ }
+
+ return current;
+ }
+
+
+ /*
+ * Currently this method is only used in a JUnit test environment. Gets a
+ * PDP record from droolspdpentity table.
+ */
+ @Override
+ public DroolsPdpEntity getPdp(String pdpId) {
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("getPdp: Entering and getting PDP with pdpId={}", pdpId);
+ }
+
+ DroolsPdpEntity droolsPdpEntity = null;
+
+ EntityManager em = null;
+ try {
+ em = emf.createEntityManager();
+ em.getTransaction().begin();
+ Query droolsPdpsListQuery = em
+ .createQuery("SELECT p FROM DroolsPdpEntity p WHERE p.pdpId=:pdpId");
+ droolsPdpsListQuery.setParameter("pdpId", pdpId);
+ List<?> droolsPdpsList = droolsPdpsListQuery.setLockMode(
+ LockModeType.NONE).setFlushMode(FlushModeType.COMMIT).getResultList();
+ if (droolsPdpsList.size() == 1
+ && droolsPdpsList.get(0) instanceof DroolsPdpEntity) {
+ droolsPdpEntity = (DroolsPdpEntity) droolsPdpsList.get(0);
+ if (logger.isDebugEnabled()) {
+ logger.debug("getPdp: PDP={}"
+ + " found, isDesignated={},"
+ + " updatedDate={}, "
+ + "priority={}", pdpId,
+ droolsPdpEntity.isDesignated(), droolsPdpEntity.getUpdatedDate(),
+ droolsPdpEntity.getPriority());
+ }
+
+ // Make sure the droolsPdpEntity is not a cached version
+ em.refresh(droolsPdpEntity);
+
+ em.getTransaction().commit();
+ } else {
+ logger.error("getPdp: PDP={} not found!?", pdpId);
+ }
+ } catch (Exception e) {
+ logger.error
+ ("getPdp: Caught Exception attempting to get PDP", e);
+ } finally {
+ cleanup(em, "getPdp");
+ }
+
+ if (logger.isDebugEnabled()) {
+ logger.debug("getPdp: Returning droolsPdpEntity={}", droolsPdpEntity);
+ }
+ return droolsPdpEntity;
+
+ }
+
+ /*
+ * Normally this method should only be used in a JUnit test environment.
+ * Manually inserts a PDP record in droolspdpentity table.
+ */
+ @Override
+ public void insertPdp(DroolsPdp pdp) {
+ if(logger.isDebugEnabled()){
+ logger.debug("insertPdp: Entering and manually inserting PDP");
+ }
+
+ /*
+ * Start transaction
+ */
+ EntityManager em = emf.createEntityManager();
+ try {
+ em.getTransaction().begin();
+
+ /*
+ * Insert record.
+ */
+ DroolsPdpEntity droolsPdpEntity = new DroolsPdpEntity();
+ em.persist(droolsPdpEntity);
+ droolsPdpEntity.setPdpId(pdp.getPdpId());
+ droolsPdpEntity.setDesignated(pdp.isDesignated());
+ droolsPdpEntity.setPriority(pdp.getPriority());
+ droolsPdpEntity.setUpdatedDate(pdp.getUpdatedDate());
+ droolsPdpEntity.setSiteName(pdp.getSiteName());
+
+ /*
+ * End transaction.
+ */
+ em.getTransaction().commit();
+ } finally {
+ cleanup(em, "insertPdp");
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("insertPdp: Exiting");
+ }
+
+ }
+
+ /*
+ * Normally this method should only be used in a JUnit test environment.
+ * Manually deletes all PDP records in droolspdpentity table.
+ */
+ @Override
+ public void deleteAllPdps() {
+
+ if(logger.isDebugEnabled()){
+ logger.debug("deleteAllPdps: Entering");
+ }
+
+ /*
+ * Start transaction
+ */
+ EntityManager em = emf.createEntityManager();
+ try {
+ em.getTransaction().begin();
+
+ Query droolsPdpsListQuery = em
+ .createQuery("SELECT p FROM DroolsPdpEntity p");
+ @SuppressWarnings("unchecked")
+ List<DroolsPdp> droolsPdpsList = droolsPdpsListQuery.setLockMode(
+ LockModeType.NONE).setFlushMode(FlushModeType.COMMIT).getResultList();
+ if(logger.isDebugEnabled()){
+ logger.debug("deleteAllPdps: Deleting {} PDPs", droolsPdpsList.size());
+ }
+ for (DroolsPdp droolsPdp : droolsPdpsList) {
+ String pdpId = droolsPdp.getPdpId();
+ deletePdp(pdpId);
+ }
+
+ /*
+ * End transaction.
+ */
+ em.getTransaction().commit();
+ } finally {
+ cleanup(em, "deleteAllPdps");
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("deleteAllPdps: Exiting");
+ }
+
+ }
+
+ /*
+ * Normally this method should only be used in a JUnit test environment.
+ * Manually deletes a PDP record in droolspdpentity table.
+ */
+ @Override
+ public void deletePdp(String pdpId) {
+ if(logger.isDebugEnabled()){
+ logger.debug("deletePdp: Entering and manually deleting pdpId={}", pdpId);
+ }
+
+ /*
+ * Start transaction
+ */
+ EntityManager em = emf.createEntityManager();
+ try {
+ em.getTransaction().begin();
+
+ /*
+ * Delete record.
+ */
+ DroolsPdpEntity droolsPdpEntity = em.find(DroolsPdpEntity.class, pdpId);
+ if (droolsPdpEntity != null) {
+ if(logger.isDebugEnabled()){
+ logger.debug("deletePdp: Removing PDP");
+ }
+ em.remove(droolsPdpEntity);
+ } else {
+ if(logger.isDebugEnabled()){
+ logger.debug("deletePdp: PDP with ID={} not currently in DB", pdpId);
+ }
+ }
+
+ /*
+ * End transaction.
+ */
+ em.getTransaction().commit();
+ } finally {
+ cleanup(em, "deletePdp");
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("deletePdp: Exiting");
+ }
+
+ }
+
+ /*
+ * Close the specified EntityManager, rolling back any pending transaction
+ *
+ * @param em the EntityManager to close ('null' is OK)
+ * @param method the invoking Java method (used for log messages)
+ */
+ private static void cleanup(EntityManager em, String method)
+ {
+ if (em != null) {
+ if (em.isOpen()) {
+ if (em.getTransaction().isActive()) {
+ // there is an active EntityTransaction -- roll it back
+ try {
+ em.getTransaction().rollback();
+ } catch (Exception e) {
+ logger.error(method + ": Caught Exception attempting to rollback EntityTransaction,", e);
+ }
+ }
+
+ // now, close the EntityManager
+ try {
+ em.close();
+ } catch (Exception e) {
+ logger.error(method + ": Caught Exception attempting to close EntityManager, ", e);
+ }
+ }
+ }
+ }
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/PMStandbyStateChangeNotifier.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/PMStandbyStateChangeNotifier.java
new file mode 100644
index 00000000..ce62bf89
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/PMStandbyStateChangeNotifier.java
@@ -0,0 +1,345 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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;
+
+/*
+ * Per MultiSite_v1-10.ppt:
+ *
+ * Extends the StateChangeNotifier class and overwrites the abstract handleStateChange() method to get state changes
+ * and do the following:
+ *
+ * When the Standby Status changes (from providingservice) to hotstandby or coldstandby,
+ * the Active/Standby selection algorithm must stand down if the PDP-D is currently the lead/active node
+ * and allow another PDP-D to take over. It must also call lock on all engines in the engine management.
+ *
+ * When the Standby Status changes from (hotstandby) to coldstandby, the Active/Standby algorithm must NOT assume
+ * the active/lead role.
+ *
+ * When the Standby Status changes (from coldstandby or providingservice) to hotstandby,
+ * the Active/Standby algorithm may assume the active/lead role if the active/lead fails.
+ *
+ * When the Standby Status changes to providingservice (from hotstandby or coldstandby) call unlock on all
+ * engines in the engine management layer.
+ */
+import java.util.Date;
+import java.util.Timer;
+import java.util.TimerTask;
+
+import org.onap.policy.common.im.StateChangeNotifier;
+import org.onap.policy.common.im.StateManagement;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.onap.policy.drools.system.PolicyEngine;
+
+/*
+ * Some background:
+ *
+ * Originally, there was a "StandbyStateChangeNotifier" that belonged to policy-core, and this class's handleStateChange() method
+ * used to take care of invoking conn.standDownPdp(). But testing revealed that when a state change to hot standby occurred
+ * from a demote() operation, first the PMStandbyStateChangeNotifier.handleStateChange() method would be invoked and then the
+ * StandbyStateChangeNotifier.handleStateChange() method would be invoked, and this ordering was creating the following problem:
+ *
+ * When PMStandbyStateChangeNotifier.handleStateChange() was invoked it would take a long time to finish, because it would result
+ * in SingleThreadedUebTopicSource.stop() being invoked, which can potentially do a 5 second sleep for each controller being stopped.
+ * Meanwhile, as these controller stoppages and their associated sleeps were occurring, the election handler would discover the
+ * demoted PDP in hotstandby (but still designated!) and promote it, resulting in the standbyStatus going from hotstandby
+ * to providingservice. So then, by the time that PMStandbyStateChangeNotifier.handleStateChange() finished its work and
+ * StandbyStateChangeNotifier.handleStateChange() started executing, the standbyStatus was no longer hotstandby (as effected by
+ * the demote), but providingservice (as reset by the election handling logic) and conn.standDownPdp() would not get called!
+ *
+ * To fix this bug, we consolidated StandbyStateChangeNotifier and PMStandbyStateChangeNotifier, with the standDownPdp() always
+ * being invoked prior to the TopicEndpoint.manager.lock(). In this way, when the election handling logic is invoked
+ * during the controller stoppages, the PDP is in hotstandby and the standdown occurs.
+ *
+ */
+public class PMStandbyStateChangeNotifier extends StateChangeNotifier {
+ // get an instance of logger
+ private static final Logger logger = LoggerFactory.getLogger(PMStandbyStateChangeNotifier.class);
+ private Timer delayActivateTimer;
+ private int pdpUpdateInterval;
+ private boolean isWaitingForActivation;
+ private long startTimeWaitingForActivationMs;
+ private long waitInterval;
+ private boolean isNowActivating;
+ private String previousStandbyStatus;
+ public static String NONE = "none";
+ public static String UNSUPPORTED = "unsupported";
+ public static String HOTSTANDBY_OR_COLDSTANDBY = "hotstandby_or_coldstandby";
+
+ public PMStandbyStateChangeNotifier(){
+ pdpUpdateInterval = Integer.parseInt(ActiveStandbyProperties.getProperty(ActiveStandbyProperties.PDP_UPDATE_INTERVAL));
+ isWaitingForActivation = false;
+ startTimeWaitingForActivationMs = new Date().getTime();
+ //delay the activate so the DesignatedWaiter can run twice - give it an extra 2 seconds
+ waitInterval = 2*pdpUpdateInterval + 2000;
+ isNowActivating=false;
+ previousStandbyStatus = PMStandbyStateChangeNotifier.NONE;
+ }
+
+ @Override
+ public void handleStateChange() {
+ /*
+ * A note on synchronization: This method is not synchronized because the caller, stateManagememt,
+ * has synchronize all of its methods. Only one stateManagement operation can occur at a time. Thus,
+ * only one handleStateChange() call will ever be made at a time.
+ */
+ if(logger.isInfoEnabled()){
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: Entering, message={}, standbyStatus={}",
+ super.getMessage(), super.getStateManagement().getStandbyStatus());
+ }
+ }
+ String standbyStatus = super.getStateManagement().getStandbyStatus();
+ String pdpId = ActiveStandbyProperties
+ .getProperty(ActiveStandbyProperties.NODE_NAME);
+
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: previousStandbyStatus = {}"
+ + "; standbyStatus = {}", previousStandbyStatus, standbyStatus);
+ }
+
+ if (standbyStatus == null || standbyStatus.equals(StateManagement.NULL_VALUE)) {
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: standbyStatus is null; standing down PDP={}", pdpId);
+ }
+ if(previousStandbyStatus.equals(StateManagement.NULL_VALUE)){
+ //We were just here and did this successfully
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: Is returning because standbyStatus is null and was previously 'null'; PDP={}", pdpId);
+ }
+ return;
+ }
+ isWaitingForActivation = false;
+ try{
+ try{
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: null: cancelling delayActivationTimer.");
+ }
+ delayActivateTimer.cancel();
+ }catch(Exception e){
+ if(logger.isInfoEnabled()){
+ logger.info("handleStateChange: null no delayActivationTimer existed.", e);
+ }
+ //If you end of here, there was no active timer
+ }
+ //Only want to lock the endpoints, not the controllers.
+ PolicyEngine.manager.deactivate();
+ //The operation was fully successful, but you cannot assign it a real null value
+ //because later we might try to execute previousStandbyStatus.equals() and get
+ //a null pointer exception.
+ previousStandbyStatus = StateManagement.NULL_VALUE;
+ }catch(Exception e){
+ logger.warn("handleStateChange: standbyStatus == null caught exception: ", e);
+ }
+ } else if (standbyStatus.equals(StateManagement.HOT_STANDBY) || standbyStatus.equals(StateManagement.COLD_STANDBY)) {
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: standbyStatus={}; standing down PDP={}", standbyStatus, pdpId);
+ }
+ if(previousStandbyStatus.equals(PMStandbyStateChangeNotifier.HOTSTANDBY_OR_COLDSTANDBY)){
+ //We were just here and did this successfully
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: Is returning because standbyStatus is {}"
+ + " and was previously {}; PDP= {}", standbyStatus, previousStandbyStatus, pdpId);
+ }
+ return;
+ }
+ isWaitingForActivation = false;
+ try{
+ try{
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: HOT_STNDBY || COLD_STANDBY: cancelling delayActivationTimer.");
+ }
+ delayActivateTimer.cancel();
+ }catch(Exception e){
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: HOT_STANDBY || COLD_STANDBY no delayActivationTimer existed.", e);
+ }
+ //If you end of here, there was no active timer
+ }
+ //Only want to lock the endpoints, not the controllers.
+ PolicyEngine.manager.deactivate();
+ //The operation was fully successful
+ previousStandbyStatus = PMStandbyStateChangeNotifier.HOTSTANDBY_OR_COLDSTANDBY;
+ }catch(Exception e){
+ logger.warn("handleStateChange: standbyStatus = {} caught exception: {}", standbyStatus, e.getMessage(), e);
+ }
+
+ } else if (standbyStatus.equals(StateManagement.PROVIDING_SERVICE)) {
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: standbyStatus= {} "
+ + "scheduling activation of PDP={}",standbyStatus, pdpId);
+ }
+ if(previousStandbyStatus.equals(StateManagement.PROVIDING_SERVICE)){
+ //We were just here and did this successfully
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: Is returning because standbyStatus is {}"
+ + "and was previously {}; PDP={}", standbyStatus, previousStandbyStatus, pdpId);
+ }
+ return;
+ }
+ try{
+ //UnLock all the endpoints
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: standbyStatus={}; controllers must be unlocked.",standbyStatus );
+ }
+ /*
+ * Only endpoints should be unlocked. Controllers have not been locked.
+ * Because, sometimes, it is possible for more than one PDP-D to become active (race conditions)
+ * we need to delay the activation of the topic endpoint interfaces to give the election algorithm
+ * time to resolve the conflict.
+ */
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: PROVIDING_SERVICE isWaitingForActivation= {}", isWaitingForActivation);
+ }
+
+ //Delay activation for 2*pdpUpdateInterval+2000 ms in case of an election handler conflict.
+ //You could have multiple election handlers thinking they can take over.
+
+ // First let's check that the timer has not died
+ if(isWaitingForActivation){
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: PROVIDING_SERVICE isWaitingForActivation = {}", isWaitingForActivation);
+ }
+ long now = new Date().getTime();
+ long waitTimeMs = now - startTimeWaitingForActivationMs;
+ if(waitTimeMs > 3*waitInterval){
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: PROVIDING_SERVICE looks like the activation wait timer may be hung,"
+ + " waitTimeMs = {} and allowable waitInterval = {}"
+ + " Checking whether it is currently in activation. isNowActivating = {}",
+ waitTimeMs, waitInterval, isNowActivating);
+ }
+ //Now check that it is not currently executing an activation
+ if(!isNowActivating){
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: PROVIDING_SERVICE looks like the activation wait timer died");
+ }
+ // This will assure the timer is cancelled and rescheduled.
+ isWaitingForActivation = false;
+ }
+ }
+
+ }
+
+ if(!isWaitingForActivation){
+ try{
+ //Just in case there is an old timer hanging around
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: PROVIDING_SERVICE cancelling delayActivationTimer.");
+ }
+ delayActivateTimer.cancel();
+ }catch(Exception e){
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: PROVIDING_SERVICE no delayActivationTimer existed.");
+ }
+ //If you end of here, there was no active timer
+ }
+ delayActivateTimer = new Timer();
+ //delay the activate so the DesignatedWaiter can run twice
+ delayActivateTimer.schedule(new DelayActivateClass(), waitInterval);
+ isWaitingForActivation = true;
+ startTimeWaitingForActivationMs = new Date().getTime();
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: PROVIDING_SERVICE scheduling delayActivationTimer in {} ms", waitInterval);
+ }
+ }else{
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: PROVIDING_SERVICE delayActivationTimer is waiting for activation.");
+ }
+ }
+
+ }catch(Exception e){
+ logger.warn("handleStateChange: PROVIDING_SERVICE standbyStatus == providingservice caught exception: ", e);
+ }
+
+ } else {
+ logger.error("handleStateChange: Unsupported standbyStatus={}; standing down PDP={}", standbyStatus, pdpId);
+ if(previousStandbyStatus.equals(PMStandbyStateChangeNotifier.UNSUPPORTED)){
+ //We were just here and did this successfully
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: Is returning because standbyStatus is "
+ + "UNSUPPORTED and was previously {}; PDP={}", previousStandbyStatus, pdpId);
+ }
+ return;
+ }
+ //Only want to lock the endpoints, not the controllers.
+ isWaitingForActivation = false;
+ try{
+ try{
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: unsupported standbystatus: cancelling delayActivationTimer.");
+ }
+ delayActivateTimer.cancel();
+ }catch(Exception e){
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: unsupported standbystatus: no delayActivationTimer existed.", e);
+ }
+ //If you end of here, there was no active timer
+ }
+ PolicyEngine.manager.deactivate();
+ //We know the standbystatus is unsupported
+ previousStandbyStatus = PMStandbyStateChangeNotifier.UNSUPPORTED;
+ }catch(Exception e){
+ logger.warn("handleStateChange: Unsupported standbyStatus = {} "
+ + "caught exception: {} ",standbyStatus, e.getMessage(), e);
+ }
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("handleStateChange: Exiting");
+ }
+ }
+
+ private class DelayActivateClass extends TimerTask{
+
+ private Object delayActivateLock = new Object();
+
+
+ @Override
+ public void run() {
+ isNowActivating = true;
+ try{
+ if(logger.isDebugEnabled()){
+ logger.debug("DelayActivateClass.run: entry");
+ }
+ synchronized(delayActivateLock){
+ PolicyEngine.manager.activate();
+ // The state change fully succeeded
+ previousStandbyStatus = StateManagement.PROVIDING_SERVICE;
+ // We want to set this to false here because the activate call can take a while
+ isWaitingForActivation = false;
+ isNowActivating = false;
+ }
+ if(logger.isDebugEnabled()){
+ logger.debug("DelayActivateClass.run.exit");
+ }
+ }catch(Exception e){
+ isWaitingForActivation = false;
+ isNowActivating = false;
+ logger.warn("DelayActivateClass.run: caught an unexpected exception "
+ + "calling PolicyEngine.manager.activate: ", e);
+ }
+ }
+ }
+
+ public String getPreviousStandbyStatus(){
+ return previousStandbyStatus;
+ }
+}
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ThreadRunningChecker.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ThreadRunningChecker.java
new file mode 100644
index 00000000..db848ebb
--- /dev/null
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ThreadRunningChecker.java
@@ -0,0 +1,26 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-active-standby-management
+ * ================================================================================
+ * Copyright (C) 2017 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;
+
+public interface ThreadRunningChecker {
+ public void checkThreadStatus();
+
+}