/**
* Copyright (C) 2012 LinkedIn Inc <opensource@linkedin.com>
*
* 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.
*/
package com.linkedin.helix.healthcheck;
import java.util.LinkedList;
import java.util.Map;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import org.apache.log4j.Logger;
import com.linkedin.helix.HelixDataAccessor;
import com.linkedin.helix.HelixManager;
import com.linkedin.helix.PropertyKey.Builder;
import com.linkedin.helix.ZNRecord;
import com.linkedin.helix.alerts.StatsHolder;
import com.linkedin.helix.model.HealthStat;
public class ParticipantHealthReportCollectorImpl implements
ParticipantHealthReportCollector
{
private final LinkedList<HealthReportProvider> _healthReportProviderList = new LinkedList<HealthReportProvider>();
private Timer _timer;
private static final Logger _logger = Logger
.getLogger(ParticipantHealthReportCollectorImpl.class);
private final HelixManager _helixManager;
String _instanceName;
public final static int DEFAULT_REPORT_LATENCY = 60 * 1000;
public ParticipantHealthReportCollectorImpl(HelixManager helixManager,
String instanceName)
{
_helixManager = helixManager;
_instanceName = instanceName;
addDefaultHealthCheckInfoProvider();
}
private void addDefaultHealthCheckInfoProvider()
{
addHealthReportProvider(new DefaultHealthReportProvider());
}
public void start()
{
if (_timer == null)
{
_timer = new Timer(true);
_timer.scheduleAtFixedRate(new HealthCheckInfoReportingTask(),
new Random().nextInt(DEFAULT_REPORT_LATENCY), DEFAULT_REPORT_LATENCY);
}
else
{
_logger.warn("timer already started");
}
}
@Override
public void addHealthReportProvider(HealthReportProvider provider)
{
try
{
synchronized (_healthReportProviderList)
{
if (!_healthReportProviderList.contains(provider))
{
_healthReportProviderList.add(provider);
}
else
{
_logger.warn("Skipping a duplicated HealthCheckInfoProvider");
}
}
}
catch (Exception e)
{
_logger.error(e);
}
}
@Override
public void removeHealthReportProvider(HealthReportProvider provider)
{
synchronized (_healthReportProviderList)
{
if (_healthReportProviderList.contains(provider))
{
_healthReportProviderList.remove(provider);
}
else
{
_logger.warn("Skip removing a non-exist HealthCheckInfoProvider");
}
}
}
@Override
public void reportHealthReportMessage(ZNRecord healthCheckInfoUpdate)
{
HelixDataAccessor accessor = _helixManager.getHelixDataAccessor();
Builder keyBuilder = accessor.keyBuilder();
// accessor.setProperty(
// PropertyType.HEALTHREPORT, healthCheckInfoUpdate, _instanceName,
// healthCheckInfoUpdate.getId());
accessor.setProperty(keyBuilder.healthReport(_instanceName, healthCheckInfoUpdate.getId()),
new HealthStat(healthCheckInfoUpdate));
}
public void stop()
{
_logger.info("Stop HealthCheckInfoReportingTask");
if (_timer != null)
{
_timer.cancel();
_timer = null;
}
else
{
_logger.warn("timer already stopped");
}
}
@Override
public synchronized void transmitHealthReports()
{
synchronized (_healthReportProviderList)
{
for (HealthReportProvider provider : _healthReportProviderList)
{
try
{
Map<String, String> report = provider.getRecentHealthReport();
Map<String, Map<String, String>> partitionReport = provider
.getRecentPartitionHealthReport();
ZNRecord record = new ZNRecord(provider.getReportName());
if (report != null)
{
record.setSimpleFields(report);
}
if (partitionReport != null)
{
record.setMapFields(partitionReport);
}
record.setSimpleField(StatsHolder.TIMESTAMP_NAME, "" + System.currentTimeMillis());
HelixDataAccessor accessor = _helixManager.getHelixDataAccessor();
Builder keyBuilder = accessor.keyBuilder();
accessor.setProperty(keyBuilder.healthReport(_instanceName, record.getId()),
new HealthStat(record));
// _helixManager.getDataAccessor().setProperty(
// PropertyType.HEALTHREPORT, record, _instanceName, record.getId());
// reset stats (for now just the partition stats)
provider.resetStats();
}
catch (Exception e)
{
_logger.error("", e);
}
}
}
}
class HealthCheckInfoReportingTask extends TimerTask
{
@Override
public void run()
{
transmitHealthReports();
}
}
}