org.spf4j.stackmonitor

Class FastStackCollector

java.lang.Object

org.spf4j.stackmonitor.FastStackCollector

All Implemented Interfaces:

ISampler

@ParametersAreNonnullByDefault
public final class FastStackCollector
extends Object
implements ISampler

This is a high performance sampling collector. The goal is for the sampling overhead to be minimal. This is better than the SimpleStackCollector in 2 ways: 1) No HashMap is created during sampling. Resulting in less garbage generated by sampling. 2) Stack trace for the sampling Thread is not created at all, saving some time and creating less garbage.

Author:

zoly

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FastStackCollector.ThreadNamesPredicate

Constructor Summary

Constructors

Constructor and Description
FastStackCollector(boolean collectRunnableThreadsOnly, boolean collectForMain, String... xtraIgnoredThreads)
FastStackCollector(boolean collectRunnableThreadsOnly, boolean collectForMain, Thread[] ignored, String... xtraIgnoredThreads)
FastStackCollector(boolean collectForMain, String... xtraIgnoredThreads)
FastStackCollector(Predicate<Thread> threadFilter, int maxNrSampledThreads)

Method Summary

Modifier and Type	Method and Description
static Predicate<Thread>	createNameBasedFilter(boolean collectRunnableThreadsOnly, boolean collectForMain, Thread[] ignored, String[] xtraIgnoredThreads)
static void	dumpToPrintStream(PrintStream stream) Deprecated. use Threads.dumpToPrintStream
Map<String,SampleNode>	getCollections()
Map<String,SampleNode>	getCollectionsAndReset()
static StackTraceElement[][]	getStackTraces(Thread... threads) Deprecated. use Threads.getStackTraces
static Thread[]	getThreads() Deprecated. use Threads.getThreads
void	sample()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

FastStackCollector

public FastStackCollector(boolean collectForMain,
                          String... xtraIgnoredThreads)

FastStackCollector

public FastStackCollector(boolean collectRunnableThreadsOnly,
                          boolean collectForMain,
                          String... xtraIgnoredThreads)

FastStackCollector

public FastStackCollector(boolean collectRunnableThreadsOnly,
                          boolean collectForMain,
                          Thread[] ignored,
                          String... xtraIgnoredThreads)

FastStackCollector

public FastStackCollector(Predicate<Thread> threadFilter,
                          int maxNrSampledThreads)

Parameters:

threadFilter - when returns true the thread is being ignored

Method Detail

createNameBasedFilter

public static Predicate<Thread> createNameBasedFilter(boolean collectRunnableThreadsOnly,
                                                      boolean collectForMain,
                                                      Thread[] ignored,
                                                      String[] xtraIgnoredThreads)

getThreads

@Deprecated
public static Thread[] getThreads()

Deprecated. use Threads.getThreads

getStackTraces

@Deprecated
public static StackTraceElement[][] getStackTraces(Thread... threads)

Deprecated. use Threads.getStackTraces

dumpToPrintStream

@Deprecated
public static void dumpToPrintStream(PrintStream stream)

Deprecated. use Threads.dumpToPrintStream

sample

public void sample()

Specified by:

sample in interface ISampler

getCollectionsAndReset

public Map<String,SampleNode> getCollectionsAndReset()

Specified by:

getCollectionsAndReset in interface ISampler

getCollections

public Map<String,SampleNode> getCollections()

Specified by:

getCollections in interface ISampler

toString

public String toString()

Overrides:

toString in class Object