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/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.internal.admin;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TimerTask;
import com.gemstone.gemfire.CancelException;
import com.gemstone.gemfire.StatisticDescriptor;
import com.gemstone.gemfire.Statistics;
import com.gemstone.gemfire.StatisticsType;
import com.gemstone.gemfire.admin.jmx.internal.StatAlertsAggregator;
import com.gemstone.gemfire.distributed.internal.DistributionManager;
import com.gemstone.gemfire.distributed.internal.InternalDistributedSystem;
import com.gemstone.gemfire.distributed.internal.membership.InternalDistributedMember;
import com.gemstone.gemfire.i18n.LogWriterI18n;
import com.gemstone.gemfire.internal.SystemTimer;
import com.gemstone.gemfire.internal.SystemTimer.SystemTimerTask;
import com.gemstone.gemfire.internal.admin.remote.AlertsNotificationMessage;
import com.gemstone.gemfire.internal.admin.remote.UpdateAlertDefinitionMessage;
import com.gemstone.gemfire.internal.admin.statalerts.DummyStatisticInfoImpl;
import com.gemstone.gemfire.internal.admin.statalerts.StatisticInfo;
import com.gemstone.gemfire.internal.admin.statalerts.StatisticInfoImpl;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
/**
* The alert manager maintains the list of alert definitions (added by client
* e.g GFMon 2.0).
*
* It retrieved the value of statistic( defined in alert definition) and notify
* alert aggregator sitting on admin VM
*
* @see StatAlertDefinition
* @see StatAlert
*
* @author mjha
*
* @since 5.7
*/
public class StatAlertsManager {
/**
* Instance for current DM
*
* @guarded.By StatAlertsManager.class
*/
private static StatAlertsManager alertManager;
/**
* @guarded.By this
*/
private long refreshInterval;
/**
* @guarded.By this.alertDefinitionsMap
*/
protected final HashMap alertDefinitionsMap = new HashMap();
/**
* @guarded.By this
*/
private SystemTimer timer;
/**
* for messaging
*/
protected final LogWriterI18n logger;
/**
* @guarded.By this
*/
private boolean refreshAtFixedRate;
/**
* Provides life cycle support
*/
protected final DistributionManager dm;
private StatAlertsManager(DistributionManager dm) {
this.dm = dm;
logger = dm.getLoggerI18n();
logger.info(LocalizedStrings.StatAlertsManager_STATALERTSMANAGER_CREATED);
}
/**
* @return singleton instance of StatAlertsManager
*/
public synchronized static StatAlertsManager getInstance(DistributionManager dm) {
// As per current implementation set up request will be send only once ,
// when member joined to Admin distributed system
// we don't need to care about race condition
if (alertManager != null && alertManager.dm == dm) {
return alertManager;
}
if (alertManager != null) {
alertManager.close();
}
/*
* Throw DistributedSystemDisconnectedException if cancel operation is in
* progress
*/
dm.getCancelCriterion().checkCancelInProgress(null);
alertManager = new StatAlertsManager(dm);
return alertManager;
}
/**
* Nullifies the StatAlertsManager instance.
*/
private synchronized static void closeInstance() {
StatAlertsManager.alertManager = null;
}
/**
*
* Update the alert's definition map
*
* @param defns
* Alert definitions
* @param actionCode
* Action to be performed like add , remove or update alert's
* definition
*
* @see UpdateAlertDefinitionMessage
*/
public void updateAlertDefinition(StatAlertDefinition[] defns, int actionCode) {
logger.fine("Entered StatAlertsManager.updateAlertDefinition *****");
synchronized (alertDefinitionsMap) {
if (actionCode == UpdateAlertDefinitionMessage.REMOVE_ALERT_DEFINITION) {
for (int i = 0; i < defns.length; i++) {
alertDefinitionsMap.remove(Integer.valueOf(defns[i].getId()));
logger.fine("Removed StatAlertDefinition:" + defns[i].getName());
}
}
else {
StatAlertDefinition[] alertDefns = this
.createMemberStatAlertDefinition(dm, defns);
StatAlertDefinition defn;
for (int i = 0; i < alertDefns.length; i++) {
defn = alertDefns[i];
alertDefinitionsMap.put(Integer.valueOf(defns[i].getId()), defn);
}
}
} // synchronized
logger.fine("Exiting StatAlertsManager.updateAlertDefinition *****");
}
private synchronized void rescheduleTimer() {
// cancel the old timer. Although cancelled, old task might execute one last
// time
if (timer != null)
timer.cancel();
// Get the swarm. Currently rather UGLY.
InternalDistributedSystem system = dm.getSystem();
if (system == null || system.getDistributionManager() != dm) {
throw new com.gemstone.gemfire.distributed.DistributedSystemDisconnectedException(
"This manager has been cancelled");
}
// start and schedule new timer
timer = new SystemTimer(system /*swarm*/, true, this.logger);
EvaluateAlertDefnsTask task = new EvaluateAlertDefnsTask();
if (refreshAtFixedRate) {
timer.scheduleAtFixedRate(task, 0, refreshInterval);
}
else {
timer.schedule(task, 0, refreshInterval);
}
}
/**
* Set refresh time interval also cancel the previous {@link TimerTask} and
* create new timer task based on ner refresh time interval
*
* @param interval
* Refresh time interval
*/
public synchronized void setRefreshTimeInterval(long interval) {
refreshInterval = interval;
rescheduleTimer();
}
/**
*
* @return time interval alert generation
*/
public synchronized long getRefreshTimeInterval() {
return refreshInterval;
}
/**
* @return true if refresh for timer has to be fixed rate see
* scheduleAtFixedRate method of {@link TimerTask}
*/
public synchronized boolean isRefreshAtFixedRate() {
return refreshAtFixedRate;
}
/**
* set true if refresh for timer has to be fixed rate see scheduleAtFixedRate
* method of {@link TimerTask}
*
* TODO never called
*
* @param refreshAtFixedRate
*/
public synchronized void setRefreshAtFixedRate(boolean refreshAtFixedRate) {
this.refreshAtFixedRate = refreshAtFixedRate;
rescheduleTimer();
}
/**
* Query all the statistic defined by alert definition and notify alerts
* aggregator if at least one statistic value crosses the threshold defined in
* alert definition
*
*/
protected StatAlert[] getAlerts() {
Set alerts = new HashSet();
synchronized (alertDefinitionsMap) {
Set keyset = alertDefinitionsMap.keySet();
Iterator iter = keyset.iterator();
StatAlert alert;
Date now = new Date();
while (iter.hasNext()) {
Integer key = (Integer)iter.next();
StatAlertDefinition defn = (StatAlertDefinition)alertDefinitionsMap
.get(key);
alert = defn.evaluateAndAlert();
if (alert != null) {
alert.setTime(now);
alerts.add(alert);
if (logger.fineEnabled()) {
logger.fine("getAlerts: found alert " + alert);
}
}
} // while
} // synchronized
return (StatAlert[])alerts.toArray(new StatAlert[alerts.size()]);
}
/**
* Convert {@link StatAlertDefinition }(Created by client like GFMon2.0) with
* {@link DummyStatisticInfoImpl} to StatAlertDefinition with
* {@link StatisticInfoImpl}
*/
private StatAlertDefinition[] createMemberStatAlertDefinition(
DistributionManager dm, StatAlertDefinition[] defns) {
dm.getCancelCriterion().checkCancelInProgress(null);
Statistics[] statistics;
StatisticsType type;
StatisticDescriptor desc;
String textId;
boolean skipDefinition = false;
List result = new ArrayList();
for (int i = 0; i < defns.length; i++) {
skipDefinition = false;
StatAlertDefinition defn = defns[i];
StatisticInfo[] statInfos = defn.getStatisticInfo();
for (int ii = 0; ii < statInfos.length && !skipDefinition; ii++) {
textId = statInfos[ii].getStatisticsTextId();
// TODO If none by TextID, use StatType and getAll.
statistics = dm.getSystem().findStatisticsByTextId(textId);
if (statistics.length == 0) {
logger.error(LocalizedStrings.
StatAlertsManager_STATALERTSMANAGER_CREATEMEMBERSTATALERTDEFINITION_STATISTICS_WITH_GIVEN_TEXTID_0_NOT_FOUND, textId);
skipDefinition = true;
// break;
continue; // To print all errors
}
type = statistics[0].getType();
desc = type.nameToDescriptor(statInfos[ii].getStatisticName());
// Replace the actual StatInfo object
statInfos[ii] = new StatisticInfoImpl(statistics[0], desc);
if (logger.fineEnabled()) {
logger.fine(
"StatAlertsManager.createMemberStatAlertDefinition: created statInfo "
+ statInfos[ii]);
}
} // for
if (!skipDefinition) {
defn.setStatisticInfo(statInfos);
result.add(defn);
logger.fine("StatAlertsManager.createMemberStatAlertDefinition :: "
+ defns[i].getStringRepresentation());
}
else {
logger
.fine("StatAlertsManager.createMemberStatAlertDefinition :: StatAlertDefinition "
+ defn.getName() + " is excluded.");
}
} // for
return (StatAlertDefinition[])
result.toArray(new StatAlertDefinition[result.size()]);
}
/**
* Shut down this instance
*/
protected synchronized void close() {
// nullify the manager instance first
closeInstance();
// cancel the old timer. Although canceled, old task might execute one last
// time
if (timer != null) {
timer.cancel();
}
timer = null;
}
/**
* Timer task to send all the alerts raised to {@link StatAlertsAggregator}
*
* @author mjha
*/
class EvaluateAlertDefnsTask extends SystemTimerTask {
/**
* Collect all the alerts raised and send it to {@link StatAlertsAggregator}
*/
@Override
public void run2() {
synchronized (StatAlertsManager.this) {
if (dm.getCancelCriterion().cancelInProgress() != null) {
return;
}
//start alert notification are supposed to send to all the
//admin agents exists in the system.
//For the DS without agent, alert manager should not create
//any alert notifications
Set adminMemberSet = dm.getAdminMemberSet();
if (adminMemberSet == null || adminMemberSet.isEmpty())
return;
logger.fine("EvaluateAlertDefnsTask: starting");
try {
StatAlert[] alerts = getAlerts();
if (alerts.length == 0) {
logger.fine("EvaluateAlertsDefnsTask: no alerts");
return;
}
AlertsNotificationMessage request = new AlertsNotificationMessage();
request.setAlerts(alerts);
if (logger.fineEnabled()) {
Iterator iterator = adminMemberSet.iterator();
while (iterator.hasNext()) {
logger.fine("EvaluateAlertDefnsTask: sending " + alerts.length
+ " alerts to " + iterator.next());
}
}
request.setRecipients(adminMemberSet);
dm.putOutgoing(request);
}
catch (CancelException e) {
StatAlertsManager.this.logger.fine(
"EvaluateAlertDefnsTask: system closed: " + e);
close();
}
catch (Exception e) {
StatAlertsManager.this.logger.error(
LocalizedStrings.StatAlertsManager_EVALUATEALERTDEFNSTASK_FAILED_WITH_AN_EXCEPTION, e);
close();
}
logger.fine(
"EvaluateAlertDefnsTask: done ");
}
} // run
/* (non-Javadoc)
* @see com.gemstone.gemfire.internal.SystemTimer.SystemTimerTask#getLogger()
*/
@Override
public LogWriterI18n getLoggerI18n() {
return StatAlertsManager.this.logger;
}
} // EvaluateAlertDefnsTask
}