diff options
Diffstat (limited to 'feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java')
| -rw-r--r-- | feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java | 1076 |
1 files changed, 1076 insertions, 0 deletions
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; + } +} |