sk.baka.webvm.analyzer
Class HistorySampler

java.lang.Object
  sk.baka.webvm.misc.BackgroundService
      sk.baka.webvm.analyzer.HistorySampler

public final class HistorySampler
extends BackgroundService

Samples the VM history regularly. You need to invoke BackgroundService.start() to start the sampler, BackgroundService.stop() to stop it. Thread-safe.

Author:

Martin Vysny

Field Summary

static SamplerConfig	HISTORY_PROBLEMS Default Problems history.
static SamplerConfig	HISTORY_VMSTAT Default VMStat history.

Fields inherited from class sk.baka.webvm.misc.BackgroundService

maxThreads, name

Constructor Summary

HistorySampler(ProblemAnalyzer analyzer)
Creates new sampler instance with default values.

HistorySampler(SamplerConfig vmstatConfig, SamplerConfig problemConfig, ProblemAnalyzer analyzer)
Creates new sampler instance.

Method Summary

void	configure(Config config) Sets the new configuration file.
List<List<ProblemReport>>	getProblemHistory() Returns a snapshot view over the problem history.
List<HistorySample>	getVmstatHistory() Returns a snapshot of the history values.
protected void	started(ScheduledExecutorService executor) Invoked when the service is started.
protected void	stopped() Invoked after the service has been stopped.

Methods inherited from class sk.baka.webvm.misc.BackgroundService

getExecutor, newDaemonFactory, start, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

HISTORY_VMSTAT

public static final SamplerConfig HISTORY_VMSTAT

Default VMStat history.

HISTORY_PROBLEMS

public static final SamplerConfig HISTORY_PROBLEMS

Default Problems history.

Constructor Detail

HistorySampler

public HistorySampler(ProblemAnalyzer analyzer)

Creates new sampler instance with default values.

Parameters:

analyzer - a configured instance of the analyzer

HistorySampler

public HistorySampler(SamplerConfig vmstatConfig,
                      SamplerConfig problemConfig,
                      ProblemAnalyzer analyzer)

Creates new sampler instance.

Parameters:

vmstatConfig - the vmstat sampler config

problemConfig - the problem sampler config

analyzer - a configured instance of the analyzer

Method Detail

configure

public void configure(Config config)

Sets the new configuration file.

Parameters:

config - the new config file.

started

protected void started(ScheduledExecutorService executor)

Description copied from class: BackgroundService

Invoked when the service is started.

Specified by:

started in class BackgroundService

Parameters:

executor - executes tasks.

stopped

protected void stopped()

Description copied from class: BackgroundService

Invoked after the service has been stopped.

Specified by:

stopped in class BackgroundService

getVmstatHistory

public List<HistorySample> getVmstatHistory()

Returns a snapshot of the history values.

Returns:

modifiable snapshot.

getProblemHistory

public List<List<ProblemReport>> getProblemHistory()

Returns a snapshot view over the problem history.

Returns:

the history.