Package org.apache.hadoop.hbase.http

Class LibraryBackend

java.lang.Object

org.apache.hadoop.hbase.http.LibraryBackend

All Implemented Interfaces:

ProfilerBackend

@Private
final class LibraryBackend
extends Object
implements ProfilerBackend

Backend that uses the async-profiler Java API (in-process). Requires the tools.profiler:async-profiler JAR and its native library on the classpath.

This class is intentionally isolated in its own file so that the JVM never loads one.profiler.AsyncProfiler on systems where the JAR is absent. It is only instantiated reflectively from ProfilerBackend.detect(java.lang.String) after confirming the class is resolvable.

Field Summary

Fields

Modifier and Type	Field	Description
private static final org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor	Description
LibraryBackend()

Method Summary

Modifier and Type	Method	Description
void	destroy()	Cleans up any resources (e.g.
String	executeStart(ProfileServlet.ProfileRequest request, File outputFile)	Executes a profiling start command and returns the profiler's response.
String	executeStop(ProfileServlet.ProfileRequest request, File outputFile)	Executes a profiling stop/dump command.

Methods inherited from class java.lang.Object

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

Field Details

LOG

private static final org.slf4j.Logger LOG

Constructor Details

LibraryBackend

LibraryBackend()

Method Details

executeStart

public String executeStart(ProfileServlet.ProfileRequest request,
 File outputFile)
                    throws IOException

Description copied from interface: ProfilerBackend

Executes a profiling start command and returns the profiler's response.

Specified by:

executeStart in interface ProfilerBackend

Throws:

IOException

executeStop

public String executeStop(ProfileServlet.ProfileRequest request,
 File outputFile)
                   throws IOException

Description copied from interface: ProfilerBackend

Executes a profiling stop/dump command.

Specified by:

executeStop in interface ProfilerBackend

Throws:

IOException

destroy

public void destroy()

Description copied from interface: ProfilerBackend

Cleans up any resources (e.g. kills a running process). Called on servlet destroy.

Specified by:

destroy in interface ProfilerBackend