diff options
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/PMStandbyStateChangeNotifier.java | 545 |
1 files changed, 280 insertions, 265 deletions
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 index 8519cdbb..805c4b80 100644 --- 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 @@ -18,8 +18,8 @@ * ============LICENSE_END========================================================= */ -package org.onap.policy.drools.activestandby; - +package org.onap.policy.drools.activestandby; + /* * Per MultiSite_v1-10.ppt: * @@ -45,9 +45,9 @@ import java.util.TimerTask; import org.onap.policy.common.im.StateChangeNotifier; import org.onap.policy.common.im.StateManagement; +import org.onap.policy.drools.system.PolicyEngine; import org.slf4j.Logger; import org.slf4j.LoggerFactory; -import org.onap.policy.drools.system.PolicyEngine; /* * Some background: @@ -66,278 +66,293 @@ import org.onap.policy.drools.system.PolicyEngine; * 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 ProxyTopicEndpointManager.getInstance().lock(). In this way, when the election handling logic is invoked + * 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 final String NONE = "none"; - public static final String UNSUPPORTED = "unsupported"; - public static final 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 + 2000L; - isNowActivating=false; - previousStandbyStatus = PMStandbyStateChangeNotifier.NONE; - } + // 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 final String NONE = "none"; + public static final String UNSUPPORTED = "unsupported"; + public static final 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 + 2000L; + 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.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; + } + } + + } - @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.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 (!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.", e); + } + // 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."); + } + } - 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); - } + } catch (Exception e) { + logger.warn("handleStateChange: PROVIDING_SERVICE standbyStatus == providingservice caught exception: ", + 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.", e); - } - //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"); + } + } - } 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 class DelayActivateClass extends TimerTask{ + private Object delayActivateLock = new Object(); - 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); + } + } + } - @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; - } + public String getPreviousStandbyStatus() { + return previousStandbyStatus; + } } |