All Known Implementing Classes:

AbstractJavaVirtualMachine, PreUnifiedJavaVirtualMachine, UnifiedJavaVirtualMachine
```
public interface JavaVirtualMachine
```
JavaVirtualMachine is a representation of the JVM state obtained by analyzing a GC log file. An instance of JavaVirtualMachine is created by calling GCToolKit.analyze(DataSource)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`accepts(DataSource dataSource)`
`void`	`analyze(List<Aggregator<? extends Aggregation>> registeredAggregations, JVMEventChannel eventChannel, DataSourceChannel dataSourceChannel)`	Interface to trigger the analysis of a gc log.
`<T extends Aggregation> Optional<T>`	`getAggregation(Class<T> aggregationClass)`	Return the `Aggregation` that was used in the analysis of the GC log file that is the same class as `aggregationClass`.
`String`	`getCommandLine()`	Return the command line used to run the JVM, if available.
`DateTimeStamp`	`getEstimatedJVMStartTime()`	Estimates the initial start time of the log in the case that the log is determined to be a fragment.
`DateTimeStamp`	`getJVMTerminationTime()`	Return the time of the last event in the GC log file.
`double`	`getRuntimeDuration()`	Return the runtime duration.
`DateTimeStamp`	`getTimeOfFirstEvent()`	Return the time of the first event in the GC log file.
`boolean`	`isCMS()`	Return `true` if the JVM was using CMS GC.
`boolean`	`isG1GC()`	Return `true` if the JVM was using G1GC.
`boolean`	`isParallel()`	Return `true` if the JVM was using Parallel GC.
`boolean`	`isSerial()`	Return `true` if the JVM was using Serial GC.
`boolean`	`isShenandoah()`	Return `true` if the JVM was using Shenandoah.
`boolean`	`isUnifiedLogging()`	True if the log is unified or false for preunified
`boolean`	`isZGC()`	Return `true` if the JVM was using ZGC.

- Method Detail
  - accepts
```
boolean accepts(DataSource dataSource)
```
    Parameters:
    
    dataSource - the log to be considered. Return true if the JavaVirtualMachine implementation can work with the GC log.
    
    Returns:
    
    true if the JavaVirtualMachine implementation can work with the GC Log.
  - isUnifiedLogging
```
boolean isUnifiedLogging()
```
    True if the log is unified or false for preunified
    
    Returns:
    
    true is the log is from JDK 9+
  - isG1GC
```
boolean isG1GC()
```
    Return true if the JVM was using G1GC.
    
    Returns:
    
    true if the GC is G1GC.
  - isZGC
```
boolean isZGC()
```
    Return true if the JVM was using ZGC.
    
    Returns:
    
    true if the GC is ZGC.
  - isShenandoah
```
boolean isShenandoah()
```
    Return true if the JVM was using Shenandoah.
    
    Returns:
    
    true if the GC is Shenandoah.
  - isParallel
```
boolean isParallel()
```
    Return true if the JVM was using Parallel GC.
    
    Returns:
    
    true if the GC is Parallel GC.
  - isSerial
```
boolean isSerial()
```
    Return true if the JVM was using Serial GC.
    
    Returns:
    
    true if the GC is Serial GC.
  - isCMS
```
boolean isCMS()
```
    Return true if the JVM was using CMS GC.
    
    Returns:
    
    true if the GC is CMS GC.
  - getCommandLine
```
String getCommandLine()
```
    Return the command line used to run the JVM, if available.
    
    Returns:
    
    The command line used to run the JVM, or null
  - getTimeOfFirstEvent
```
DateTimeStamp getTimeOfFirstEvent()
```
    Return the time of the first event in the GC log file.
    
    Returns:
    
    The time of the last event.
  - getEstimatedJVMStartTime
```
DateTimeStamp getEstimatedJVMStartTime()
```
    Estimates the initial start time of the log in the case that the log is determined to be a fragment. Otherwise, return a start time of 0.000 seconds
    
    Returns:
    
    The time of the first event.
  - getJVMTerminationTime
```
DateTimeStamp getJVMTerminationTime()
```
    Return the time of the last event in the GC log file.
    
    Returns:
    
    The time of the last event.
  - getRuntimeDuration
```
double getRuntimeDuration()
```
    Return the runtime duration. This is not necessarily the difference between the first and last event. Rather, this calculation considers the duration of the events.
    
    Returns:
    
    The runtime duration that the GC log represents.
  - getAggregation
```
<T extends Aggregation> Optional<T> getAggregation(Class<T> aggregationClass)
```
    Return the Aggregation that was used in the analysis of the GC log file that is the same class as aggregationClass. In other words, aggregationClass is a key used to look up an instance of the Aggregation. The return value may be null if the Aggregation was not used in the analysis. Which Aggregations are used depends on the GC.
    
    Type Parameters:
    
    T - type cast for the Aggregation class type.
    
    Parameters:
    
    aggregationClass - The class of the Aggregation to be returned.
    
    Returns:
    
    an Aggregation whose getClass() == aggregationClass, or null if given aggregationClass is not available.
  - analyze
```
void analyze(List<Aggregator<? extends Aggregation>> registeredAggregations,
             JVMEventChannel eventChannel,
             DataSourceChannel dataSourceChannel)
```
    Interface to trigger the analysis of a gc log.
    
    Parameters:
    
    registeredAggregations - all aggregations supplied by the module SPI
    
    eventChannel - JVMEvent message channel
    
    dataSourceChannel - GC logging data channel

Interface JavaVirtualMachine

Method Summary

Method Detail

accepts

isUnifiedLogging

isG1GC

isZGC

isShenandoah

isParallel

isSerial

isCMS

getCommandLine

getTimeOfFirstEvent

getEstimatedJVMStartTime

getJVMTerminationTime

getRuntimeDuration

getAggregation

analyze