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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cassandra.metrics;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.Locale;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import com.google.common.annotations.VisibleForTesting;
import com.codahale.metrics.*;
import org.apache.cassandra.utils.MBeanWrapper;
/**
* Makes integrating 3.0 metrics API with 2.0.
*
* The 3.0 API comes with poor JMX integration
*
*/
public class CassandraMetricsRegistry extends MetricRegistry
{
public static final CassandraMetricsRegistry Metrics = new CassandraMetricsRegistry();
private final Map threadPoolMetrics = new ConcurrentHashMap<>();
private final MBeanWrapper mBeanServer = MBeanWrapper.instance;
private CassandraMetricsRegistry()
{
super();
}
public Counter counter(MetricName name)
{
Counter counter = counter(name.getMetricName());
registerMBean(counter, name.getMBeanName());
return counter;
}
public Counter counter(MetricName name, MetricName alias)
{
Counter counter = counter(name);
registerAlias(name, alias);
return counter;
}
public Meter meter(MetricName name)
{
Meter meter = meter(name.getMetricName());
registerMBean(meter, name.getMBeanName());
return meter;
}
public Meter meter(MetricName name, MetricName alias)
{
Meter meter = meter(name);
registerAlias(name, alias);
return meter;
}
public Histogram histogram(MetricName name, boolean considerZeroes)
{
Histogram histogram = register(name, new ClearableHistogram(new DecayingEstimatedHistogramReservoir(considerZeroes)));
registerMBean(histogram, name.getMBeanName());
return histogram;
}
public Histogram histogram(MetricName name, MetricName alias, boolean considerZeroes)
{
Histogram histogram = histogram(name, considerZeroes);
registerAlias(name, alias);
return histogram;
}
public Timer timer(MetricName name)
{
Timer timer = register(name, new Timer(new DecayingEstimatedHistogramReservoir()));
registerMBean(timer, name.getMBeanName());
return timer;
}
public Timer timer(MetricName name, MetricName alias)
{
Timer timer = timer(name);
registerAlias(name, alias);
return timer;
}
public T register(MetricName name, T metric)
{
try
{
register(name.getMetricName(), metric);
registerMBean(metric, name.getMBeanName());
return metric;
}
catch (IllegalArgumentException e)
{
Metric existing = Metrics.getMetrics().get(name.getMetricName());
return (T)existing;
}
}
public Collection allThreadPoolMetrics()
{
return Collections.unmodifiableCollection(threadPoolMetrics.values());
}
public Optional getThreadPoolMetrics(String poolName)
{
return Optional.ofNullable(threadPoolMetrics.get(poolName));
}
ThreadPoolMetrics register(ThreadPoolMetrics metrics)
{
threadPoolMetrics.put(metrics.poolName, metrics);
return metrics;
}
void remove(ThreadPoolMetrics metrics)
{
threadPoolMetrics.remove(metrics.poolName, metrics);
}
public T register(MetricName name, MetricName aliasName, T metric)
{
T ret = register(name, metric);
registerAlias(name, aliasName);
return ret;
}
public T register(MetricName name, T metric, MetricName... aliases)
{
T ret = register(name, metric);
for (MetricName aliasName : aliases)
{
registerAlias(name, aliasName);
}
return ret;
}
public boolean remove(MetricName name)
{
boolean removed = remove(name.getMetricName());
mBeanServer.unregisterMBean(name.getMBeanName(), MBeanWrapper.OnException.IGNORE);
return removed;
}
public boolean remove(MetricName name, MetricName... aliases)
{
if (remove(name))
{
for (MetricName alias : aliases)
{
removeAlias(alias);
}
return true;
}
return false;
}
public void registerMBean(Metric metric, ObjectName name)
{
AbstractBean mbean;
if (metric instanceof Gauge)
mbean = new JmxGauge((Gauge) metric, name);
else if (metric instanceof Counter)
mbean = new JmxCounter((Counter) metric, name);
else if (metric instanceof Histogram)
mbean = new JmxHistogram((Histogram) metric, name);
else if (metric instanceof Timer)
mbean = new JmxTimer((Timer) metric, name, TimeUnit.SECONDS, TimeUnit.MICROSECONDS);
else if (metric instanceof Metered)
mbean = new JmxMeter((Metered) metric, name, TimeUnit.SECONDS);
else
throw new IllegalArgumentException("Unknown metric type: " + metric.getClass());
if (!mBeanServer.isRegistered(name))
mBeanServer.registerMBean(mbean, name, MBeanWrapper.OnException.LOG);
}
private void registerAlias(MetricName existingName, MetricName aliasName)
{
Metric existing = Metrics.getMetrics().get(existingName.getMetricName());
assert existing != null : existingName + " not registered";
registerMBean(existing, aliasName.getMBeanName());
}
private void removeAlias(MetricName name)
{
if (mBeanServer.isRegistered(name.getMBeanName()))
MBeanWrapper.instance.unregisterMBean(name.getMBeanName(), MBeanWrapper.OnException.IGNORE);
}
/**
* Strips a single final '$' from input
*
* @param s String to strip
* @return a string with one less '$' at end
*/
private static String withoutFinalDollar(String s)
{
int l = s.length();
return (l!=0 && '$' == s.charAt(l-1))?s.substring(0,l-1):s;
}
public interface MetricMBean
{
ObjectName objectName();
}
private abstract static class AbstractBean implements MetricMBean
{
private final ObjectName objectName;
AbstractBean(ObjectName objectName)
{
this.objectName = objectName;
}
@Override
public ObjectName objectName()
{
return objectName;
}
}
public interface JmxGaugeMBean extends MetricMBean
{
Object getValue();
}
private static class JmxGauge extends AbstractBean implements JmxGaugeMBean
{
private final Gauge metric;
private JmxGauge(Gauge metric, ObjectName objectName)
{
super(objectName);
this.metric = metric;
}
@Override
public Object getValue()
{
return metric.getValue();
}
}
public interface JmxHistogramMBean extends MetricMBean
{
long getCount();
long getMin();
long getMax();
double getMean();
double getStdDev();
double get50thPercentile();
double get75thPercentile();
double get95thPercentile();
double get98thPercentile();
double get99thPercentile();
double get999thPercentile();
long[] values();
long[] getRecentValues();
}
private static class JmxHistogram extends AbstractBean implements JmxHistogramMBean
{
private final Histogram metric;
private long[] last = null;
private JmxHistogram(Histogram metric, ObjectName objectName)
{
super(objectName);
this.metric = metric;
}
@Override
public double get50thPercentile()
{
return metric.getSnapshot().getMedian();
}
@Override
public long getCount()
{
return metric.getCount();
}
@Override
public long getMin()
{
return metric.getSnapshot().getMin();
}
@Override
public long getMax()
{
return metric.getSnapshot().getMax();
}
@Override
public double getMean()
{
return metric.getSnapshot().getMean();
}
@Override
public double getStdDev()
{
return metric.getSnapshot().getStdDev();
}
@Override
public double get75thPercentile()
{
return metric.getSnapshot().get75thPercentile();
}
@Override
public double get95thPercentile()
{
return metric.getSnapshot().get95thPercentile();
}
@Override
public double get98thPercentile()
{
return metric.getSnapshot().get98thPercentile();
}
@Override
public double get99thPercentile()
{
return metric.getSnapshot().get99thPercentile();
}
@Override
public double get999thPercentile()
{
return metric.getSnapshot().get999thPercentile();
}
@Override
public long[] values()
{
return metric.getSnapshot().getValues();
}
/**
* Returns a histogram describing the values recorded since the last time this method was called.
*
* ex. If the counts are [0, 1, 2, 1] at the time the first caller arrives, but change to [1, 2, 3, 2] by the
* time a second caller arrives, the second caller will receive [1, 1, 1, 1].
*
* @return a histogram whose bucket offsets are assumed to be in nanoseconds
*/
@Override
public synchronized long[] getRecentValues()
{
long[] now = metric.getSnapshot().getValues();
long[] delta = delta(now, last);
last = now;
return delta;
}
}
public interface JmxCounterMBean extends MetricMBean
{
long getCount();
}
private static class JmxCounter extends AbstractBean implements JmxCounterMBean
{
private final Counter metric;
private JmxCounter(Counter metric, ObjectName objectName)
{
super(objectName);
this.metric = metric;
}
@Override
public long getCount()
{
return metric.getCount();
}
}
public interface JmxMeterMBean extends MetricMBean
{
long getCount();
double getMeanRate();
double getOneMinuteRate();
double getFiveMinuteRate();
double getFifteenMinuteRate();
String getRateUnit();
}
private static class JmxMeter extends AbstractBean implements JmxMeterMBean
{
private final Metered metric;
private final double rateFactor;
private final String rateUnit;
private JmxMeter(Metered metric, ObjectName objectName, TimeUnit rateUnit)
{
super(objectName);
this.metric = metric;
this.rateFactor = rateUnit.toSeconds(1);
this.rateUnit = "events/" + calculateRateUnit(rateUnit);
}
@Override
public long getCount()
{
return metric.getCount();
}
@Override
public double getMeanRate()
{
return metric.getMeanRate() * rateFactor;
}
@Override
public double getOneMinuteRate()
{
return metric.getOneMinuteRate() * rateFactor;
}
@Override
public double getFiveMinuteRate()
{
return metric.getFiveMinuteRate() * rateFactor;
}
@Override
public double getFifteenMinuteRate()
{
return metric.getFifteenMinuteRate() * rateFactor;
}
@Override
public String getRateUnit()
{
return rateUnit;
}
private String calculateRateUnit(TimeUnit unit)
{
final String s = unit.toString().toLowerCase(Locale.US);
return s.substring(0, s.length() - 1);
}
}
public interface JmxTimerMBean extends JmxMeterMBean
{
double getMin();
double getMax();
double getMean();
double getStdDev();
double get50thPercentile();
double get75thPercentile();
double get95thPercentile();
double get98thPercentile();
double get99thPercentile();
double get999thPercentile();
long[] values();
long[] getRecentValues();
String getDurationUnit();
}
static class JmxTimer extends JmxMeter implements JmxTimerMBean
{
private final Timer metric;
private final double durationFactor;
private final String durationUnit;
private long[] last = null;
private JmxTimer(Timer metric,
ObjectName objectName,
TimeUnit rateUnit,
TimeUnit durationUnit)
{
super(metric, objectName, rateUnit);
this.metric = metric;
this.durationFactor = 1.0 / durationUnit.toNanos(1);
this.durationUnit = durationUnit.toString().toLowerCase(Locale.US);
}
@Override
public double get50thPercentile()
{
return metric.getSnapshot().getMedian() * durationFactor;
}
@Override
public double getMin()
{
return metric.getSnapshot().getMin() * durationFactor;
}
@Override
public double getMax()
{
return metric.getSnapshot().getMax() * durationFactor;
}
@Override
public double getMean()
{
return metric.getSnapshot().getMean() * durationFactor;
}
@Override
public double getStdDev()
{
return metric.getSnapshot().getStdDev() * durationFactor;
}
@Override
public double get75thPercentile()
{
return metric.getSnapshot().get75thPercentile() * durationFactor;
}
@Override
public double get95thPercentile()
{
return metric.getSnapshot().get95thPercentile() * durationFactor;
}
@Override
public double get98thPercentile()
{
return metric.getSnapshot().get98thPercentile() * durationFactor;
}
@Override
public double get99thPercentile()
{
return metric.getSnapshot().get99thPercentile() * durationFactor;
}
@Override
public double get999thPercentile()
{
return metric.getSnapshot().get999thPercentile() * durationFactor;
}
@Override
public long[] values()
{
return metric.getSnapshot().getValues();
}
/**
* Returns a histogram describing the values recorded since the last time this method was called.
*
* ex. If the counts are [0, 1, 2, 1] at the time the first caller arrives, but change to [1, 2, 3, 2] by the
* time a second caller arrives, the second caller will receive [1, 1, 1, 1].
*
* @return a histogram whose bucket offsets are assumed to be in nanoseconds
*/
@Override
public synchronized long[] getRecentValues()
{
long[] now = metric.getSnapshot().getValues();
long[] delta = delta(now, last);
last = now;
return delta;
}
@Override
public String getDurationUnit()
{
return durationUnit;
}
}
/**
* Used to determine the changes in a histogram since the last time checked.
*
* @param now The current histogram
* @param last The previous value of the histogram
* @return the difference between now and last
*/
@VisibleForTesting
static long[] delta(long[] now, long[] last)
{
long[] delta = new long[now.length];
if (last == null)
{
last = new long[now.length];
}
for(int i = 0; i< now.length; i++)
{
delta[i] = now[i] - (i < last.length? last[i] : 0);
}
return delta;
}
/**
* A value class encapsulating a metric's owning class and name.
*/
public static class MetricName implements Comparable
{
private final String group;
private final String type;
private final String name;
private final String scope;
private final String mBeanName;
/**
* Creates a new {@link MetricName} without a scope.
*
* @param klass the {@link Class} to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
*/
public MetricName(Class klass, String name)
{
this(klass, name, null);
}
/**
* Creates a new {@link MetricName} without a scope.
*
* @param group the group to which the {@link Metric} belongs
* @param type the type to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
*/
public MetricName(String group, String type, String name)
{
this(group, type, name, null);
}
/**
* Creates a new {@link MetricName} without a scope.
*
* @param klass the {@link Class} to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
* @param scope the scope of the {@link Metric}
*/
public MetricName(Class klass, String name, String scope)
{
this(klass.getPackage() == null ? "" : klass.getPackage().getName(),
withoutFinalDollar(klass.getSimpleName()),
name,
scope);
}
/**
* Creates a new {@link MetricName} without a scope.
*
* @param group the group to which the {@link Metric} belongs
* @param type the type to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
* @param scope the scope of the {@link Metric}
*/
public MetricName(String group, String type, String name, String scope)
{
this(group, type, name, scope, createMBeanName(group, type, name, scope));
}
/**
* Creates a new {@link MetricName} without a scope.
*
* @param group the group to which the {@link Metric} belongs
* @param type the type to which the {@link Metric} belongs
* @param name the name of the {@link Metric}
* @param scope the scope of the {@link Metric}
* @param mBeanName the 'ObjectName', represented as a string, to use when registering the
* MBean.
*/
public MetricName(String group, String type, String name, String scope, String mBeanName)
{
if (group == null || type == null)
{
throw new IllegalArgumentException("Both group and type need to be specified");
}
if (name == null)
{
throw new IllegalArgumentException("Name needs to be specified");
}
this.group = group;
this.type = type;
this.name = name;
this.scope = scope;
this.mBeanName = mBeanName;
}
/**
* Returns the group to which the {@link Metric} belongs. For class-based metrics, this will be
* the package name of the {@link Class} to which the {@link Metric} belongs.
*
* @return the group to which the {@link Metric} belongs
*/
public String getGroup()
{
return group;
}
/**
* Returns the type to which the {@link Metric} belongs. For class-based metrics, this will be
* the simple class name of the {@link Class} to which the {@link Metric} belongs.
*
* @return the type to which the {@link Metric} belongs
*/
public String getType()
{
return type;
}
/**
* Returns the name of the {@link Metric}.
*
* @return the name of the {@link Metric}
*/
public String getName()
{
return name;
}
public String getMetricName()
{
return MetricRegistry.name(group, type, name, scope);
}
/**
* Returns the scope of the {@link Metric}.
*
* @return the scope of the {@link Metric}
*/
public String getScope()
{
return scope;
}
/**
* Returns {@code true} if the {@link Metric} has a scope, {@code false} otherwise.
*
* @return {@code true} if the {@link Metric} has a scope
*/
public boolean hasScope()
{
return scope != null;
}
/**
* Returns the MBean name for the {@link Metric} identified by this metric name.
*
* @return the MBean name
*/
public ObjectName getMBeanName()
{
String mname = mBeanName;
if (mname == null)
mname = getMetricName();
try
{
return new ObjectName(mname);
} catch (MalformedObjectNameException e)
{
try
{
return new ObjectName(ObjectName.quote(mname));
} catch (MalformedObjectNameException e1)
{
throw new RuntimeException(e1);
}
}
}
@Override
public boolean equals(Object o)
{
if (this == o)
{
return true;
}
if (o == null || getClass() != o.getClass())
{
return false;
}
final MetricName that = (MetricName) o;
return mBeanName.equals(that.mBeanName);
}
@Override
public int hashCode()
{
return mBeanName.hashCode();
}
@Override
public String toString()
{
return mBeanName;
}
@Override
public int compareTo(MetricName o)
{
return mBeanName.compareTo(o.mBeanName);
}
private static String createMBeanName(String group, String type, String name, String scope)
{
final StringBuilder nameBuilder = new StringBuilder();
nameBuilder.append(ObjectName.quote(group));
nameBuilder.append(":type=");
nameBuilder.append(ObjectName.quote(type));
if (scope != null)
{
nameBuilder.append(",scope=");
nameBuilder.append(ObjectName.quote(scope));
}
if (name.length() > 0)
{
nameBuilder.append(",name=");
nameBuilder.append(ObjectName.quote(name));
}
return nameBuilder.toString();
}
/**
* If the group is empty, use the package name of the given class. Otherwise use group
*
* @param group The group to use by default
* @param klass The class being tracked
* @return a group for the metric
*/
public static String chooseGroup(String group, Class klass)
{
if (group == null || group.isEmpty())
{
group = klass.getPackage() == null ? "" : klass.getPackage().getName();
}
return group;
}
/**
* If the type is empty, use the simple name of the given class. Otherwise use type
*
* @param type The type to use by default
* @param klass The class being tracked
* @return a type for the metric
*/
public static String chooseType(String type, Class klass)
{
if (type == null || type.isEmpty())
{
type = withoutFinalDollar(klass.getSimpleName());
}
return type;
}
/**
* If name is empty, use the name of the given method. Otherwise use name
*
* @param name The name to use by default
* @param method The method being tracked
* @return a name for the metric
*/
public static String chooseName(String name, Method method)
{
if (name == null || name.isEmpty())
{
name = method.getName();
}
return name;
}
}
}
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