TimingSession (Performetrics 2.2.1 API)

java.lang.Object
- net.obvj.performetrics.TimingSession

```
public class TimingSession
extends Object
```
A convenient timing object that supports multiple counter types.

Use the default constructor, with no arguments, to create a timing session with all of the available metrics. If required, an additional constructor may be used to provide a timing session with specific counters. E.g.:
```
 new TimingSession(); // provides all available counter types
 new TimingSession(Counter.Type.WALL_CLOCK_TIME); // wall-clock time only
 new TimingSession(Counter.Type.CPU_TIME, Counter.Type.USER_TIME); // two counters
 
```
Note: For a list of available counters, refer to Counter.Type.

Call start() to start the timing session. When you are done, call stop() to complete the timing session.

Use elapsedTime(Counter.Type) to retrieve the elapsed time for a particular counter. E.g.:
```
 double elapsedTimeNanos = cpuTime.elapsedTime(Counter.Type.CPU_TIME, TimeUnit.NANOSECONDS);
 
```
Although it is intended that the output methods elapsedTime() should be called after the stop, some suitable, temporary data may be returned if the timing session is on going. In this scenario, the initial values will be compared to the most up-to-date ones, retrieved at the moment of the call.

Note: This class is not thread-safe. In a multi-thread context, different instances must be created for each thread.
Since:

2.2.0

Author:

oswaldo.bapvic.jr

See Also:

Counter, Counter.Type, Stopwatch

Constructor Summary

Constructors
Constructor and Description
`TimingSession()` Creates a new timing session with default counter types.
`TimingSession(Counter.Type... types)` Creates a new timing session with custom counter types.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Duration`	`elapsedTime(Counter.Type type)` A convenient method that returns the elapsed time of a specific counter.
`double`	`elapsedTime(Counter.Type type, TimeUnit timeUnit)` A convenient method that returns the elapsed time of a specific counter, in the specified time unit.
`double`	`elapsedTime(Counter.Type type, TimeUnit timeUnit, ConversionMode conversionMode)` A convenient method that returns the elapsed time of a specific counter, in the specified time unit, by applying a custom `ConversionMode`.
`Counter`	`getCounter(Counter.Type type)` Returns the counter instance associated with a given type in this timing session.
`Collection<Counter>`	`getCounters()` Returns the counters associated with this timing session.
`boolean`	`isStarted()` Returns `true` if this timing session is started.
`void`	`reset()` Resets all counters associated with this timing session.
`void`	`start()` Starts the timing session.
`void`	`stop()` Stops the timing session.

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

- Constructor Detail
  - TimingSession
```
public TimingSession()
```
    Creates a new timing session with default counter types.
  - TimingSession
```
public TimingSession(Counter.Type... types)
```
    Creates a new timing session with custom counter types.
    
    Parameters:
    
    types - the counter types to set
- Method Detail
  - reset
```
public void reset()
```
    Resets all counters associated with this timing session.
  - start
```
public void start()
```
    Starts the timing session.
    
    Throws:
    
    IllegalStateException - if the session state is not suitable for this action
  - stop
```
public void stop()
```
    Stops the timing session.
    
    Throws:
    
    IllegalStateException - if the session state is not suitable for this action
  - isStarted
```
public boolean isStarted()
```
    Returns true if this timing session is started.
    
    Returns:
    
    true if the timing session is started; otherwise, false
  - elapsedTime
```
public Duration elapsedTime(Counter.Type type)
```
    A convenient method that returns the elapsed time of a specific counter.
    This has the same effect as calling: timingSession.getCounter(type).elapsedTime()
    
    Parameters:
    
    type - the counter type to be fetched
    
    Returns:
    
    the elapsed time for the specified counter
    
    Throws:
    
    IllegalArgumentException - if the type was not specified in this timing session
    
    Since:
    
    2.1.0
  - elapsedTime
```
public double elapsedTime(Counter.Type type,
                          TimeUnit timeUnit)
```
    A convenient method that returns the elapsed time of a specific counter, in the specified time unit.
    This has the same effect as calling: timingSession.getCounter(type).elapsedTime(timeUnit)
    
    Parameters:
    
    type - the counter type to be fetched
    
    timeUnit - the time unit to which the elapsed time will be converted
    
    Returns:
    
    the elapsed time for the specified counter, converted to the given time unit using the default conversion mode.
    
    Throws:
    
    IllegalArgumentException - if the type was not specified in this timing session
    
    Since:
    
    2.1.0
  - elapsedTime
```
public double elapsedTime(Counter.Type type,
                          TimeUnit timeUnit,
                          ConversionMode conversionMode)
```
    A convenient method that returns the elapsed time of a specific counter, in the specified time unit, by applying a custom ConversionMode.
    This has the same effect as calling: timingSession.getCounter(type).elapsedTime(timeUnit, conversionMode)
    
    Parameters:
    
    type - the counter type to be fetched
    
    timeUnit - the time unit to which the elapsed time will be converted
    
    conversionMode - the ConversionMode to be applied
    
    Returns:
    
    the elapsed time for the specified counter, converted to the given time unit using the given conversion mode.
    
    Throws:
    
    IllegalArgumentException - if the type was not specified in this timing session
    
    Since:
    
    2.1.0
  - getCounters
```
public Collection<Counter> getCounters()
```
    Returns the counters associated with this timing session.
    
    Returns:
    
    all counters associated with this timing session
  - getCounter
```
public Counter getCounter(Counter.Type type)
```
    Returns the counter instance associated with a given type in this timing session.
    
    Parameters:
    
    type - the counter type to be fetched
    
    Returns:
    
    the counter instance associated with the given type in this timing session
    
    Throws:
    
    IllegalArgumentException - if the type was not specified in this timing session

Class TimingSession

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

TimingSession

TimingSession

Method Detail

reset

start

stop

isStarted

elapsedTime

elapsedTime

elapsedTime

getCounters

getCounter