Timer (Metrics Core Library 2.2.0 API)

java.lang.Object
- com.yammer.metrics.core.Timer

All Implemented Interfaces:

Metered, Metric, Sampling, Stoppable, Summarizable
```
public class Timer
extends Object
implements Metered, Stoppable, Sampling, Summarizable
```
A timer metric which aggregates timing durations and provides duration statistics, plus throughput statistics via Meter.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`clear()` Clears all recorded durations.
`long`	`count()` Returns the number of events which have been marked.
`TimeUnit`	`durationUnit()` Returns the timer's duration scale unit.
`String`	`eventType()` Returns the type of events the meter is measuring.
`double`	`fifteenMinuteRate()` Returns the fifteen-minute exponentially-weighted moving average rate at which events have occurred since the meter was created.
`double`	`fiveMinuteRate()` Returns the five-minute exponentially-weighted moving average rate at which events have occurred since the meter was created.
`Snapshot`	`getSnapshot()` Returns a snapshot of the values.
`double`	`max()` Returns the longest recorded duration.
`double`	`mean()` Returns the arithmetic mean of all recorded durations.
`double`	`meanRate()` Returns the mean rate at which events have occurred since the meter was created.
`double`	`min()` Returns the shortest recorded duration.
`double`	`oneMinuteRate()` Returns the one-minute exponentially-weighted moving average rate at which events have occurred since the meter was created.
`<T> void`	`processWith(MetricProcessor<T> processor, MetricName name, T context)` Allow the given `MetricProcessor` to process `this` as a metric.
`TimeUnit`	`rateUnit()` Returns the meter's rate unit.
`double`	`stdDev()` Returns the standard deviation of all recorded durations.
`void`	`stop()` Stop the instance.
`double`	`sum()` Returns the sum of all recorded durations.
`TimerContext`	`time()` Returns a timing `TimerContext`, which measures an elapsed time in nanoseconds.
`<T> T`	`time(Callable<T> event)` Times and records the duration of event.
`void`	`update(long duration, TimeUnit unit)` Adds a recorded duration.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - durationUnit
```
public TimeUnit durationUnit()
```
    Returns the timer's duration scale unit.
    
    Returns:
    the timer's duration scale unit
  - rateUnit
```
public TimeUnit rateUnit()
```
    Description copied from interface: Metered
    
    Returns the meter's rate unit.
    
    Specified by:
    
    rateUnit in interface Metered
    
    Returns:
    the meter's rate unit
  - clear
```
public void clear()
```
    Clears all recorded durations.
  - update
```
public void update(long duration,
          TimeUnit unit)
```
    Adds a recorded duration.
    
    Parameters:
    duration - the length of the duration
    unit - the scale unit of duration
  - time
```
public <T> T time(Callable<T> event)
       throws Exception
```
    Times and records the duration of event.
    
    Type Parameters:
    T - the type of the value returned by event
    Parameters:
    event - a Callable whose Callable.call() method implements a process whose duration should be timed
    
    Returns:
    the value returned by event
    
    Throws:
    
    Exception - if event throws an Exception
  - time
```
public TimerContext time()
```
    Returns a timing TimerContext, which measures an elapsed time in nanoseconds.
    
    Returns:
    a new TimerContext
  - count
```
public long count()
```
    Description copied from interface: Metered
    
    Returns the number of events which have been marked.
    
    Specified by:
    
    count in interface Metered
    
    Returns:
    the number of events which have been marked
  - fifteenMinuteRate
```
public double fifteenMinuteRate()
```
    Description copied from interface: Metered
    
    Returns the fifteen-minute exponentially-weighted moving average rate at which events have occurred since the meter was created.
    This rate has the same exponential decay factor as the fifteen-minute load average in the top Unix command.
    
    Specified by:
    
    fifteenMinuteRate in interface Metered
    
    Returns:
    the fifteen-minute exponentially-weighted moving average rate at which events have occurred since the meter was created
  - fiveMinuteRate
```
public double fiveMinuteRate()
```
    Description copied from interface: Metered
    
    Returns the five-minute exponentially-weighted moving average rate at which events have occurred since the meter was created.
    This rate has the same exponential decay factor as the five-minute load average in the top Unix command.
    
    Specified by:
    
    fiveMinuteRate in interface Metered
    
    Returns:
    the five-minute exponentially-weighted moving average rate at which events have occurred since the meter was created
  - meanRate
```
public double meanRate()
```
    Description copied from interface: Metered
    
    Returns the mean rate at which events have occurred since the meter was created.
    
    Specified by:
    
    meanRate in interface Metered
    
    Returns:
    the mean rate at which events have occurred since the meter was created
  - oneMinuteRate
```
public double oneMinuteRate()
```
    Description copied from interface: Metered
    
    Returns the one-minute exponentially-weighted moving average rate at which events have occurred since the meter was created.
    This rate has the same exponential decay factor as the one-minute load average in the top Unix command.
    
    Specified by:
    
    oneMinuteRate in interface Metered
    
    Returns:
    the one-minute exponentially-weighted moving average rate at which events have occurred since the meter was created
  - max
```
public double max()
```
    Returns the longest recorded duration.
    
    Specified by:
    
    max in interface Summarizable
    
    Returns:
    the longest recorded duration
  - min
```
public double min()
```
    Returns the shortest recorded duration.
    
    Specified by:
    
    min in interface Summarizable
    
    Returns:
    the shortest recorded duration
  - mean
```
public double mean()
```
    Returns the arithmetic mean of all recorded durations.
    
    Specified by:
    
    mean in interface Summarizable
    
    Returns:
    the arithmetic mean of all recorded durations
  - stdDev
```
public double stdDev()
```
    Returns the standard deviation of all recorded durations.
    
    Specified by:
    
    stdDev in interface Summarizable
    
    Returns:
    the standard deviation of all recorded durations
  - sum
```
public double sum()
```
    Returns the sum of all recorded durations.
    
    Specified by:
    
    sum in interface Summarizable
    
    Returns:
    the sum of all recorded durations
  - getSnapshot
```
public Snapshot getSnapshot()
```
    Description copied from interface: Sampling
    
    Returns a snapshot of the values.
    
    Specified by:
    
    getSnapshot in interface Sampling
    
    Returns:
    a snapshot of the values
  - eventType
```
public String eventType()
```
    Description copied from interface: Metered
    
    Returns the type of events the meter is measuring.
    
    Specified by:
    
    eventType in interface Metered
    
    Returns:
    the meter's event type
  - stop
```
public void stop()
```
    Description copied from interface: Stoppable
    
    Stop the instance.
    
    Specified by:
    
    stop in interface Stoppable
  - processWith
```
public <T> void processWith(MetricProcessor<T> processor,
                   MetricName name,
                   T context)
                 throws Exception
```
    Description copied from interface: Metric
    
    Allow the given MetricProcessor to process this as a metric.
    
    Specified by:
    
    processWith in interface Metric
    
    Type Parameters:
    T - the type of the context object
    Parameters:
    processor - a MetricProcessor
    name - the name of the current metric
    context - a given context which should be passed on to processor
    
    Throws:
    
    Exception - if something goes wrong

Class Timer

Method Summary

Methods inherited from class java.lang.Object

Method Detail

durationUnit

rateUnit

clear

update

time

time

count

fifteenMinuteRate

fiveMinuteRate

meanRate

oneMinuteRate

max

min

mean

stdDev

sum

getSnapshot

eventType

stop

processWith