Package org.apache.hadoop.service.launcher

Class IrqHandler

java.lang.Object

org.apache.hadoop.service.launcher.IrqHandler

All Implemented Interfaces:

SignalUtil.Handler

@Private
@Unstable
public final class IrqHandler
extends Object
implements SignalUtil.Handler

Handler of interrupts that relays them to a registered implementation of IrqHandler.Interrupted. This class bundles up all the compiler warnings about abuse of sun.misc interrupt handling code into one place.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	IrqHandler.InterruptData	Interrupt data to pass on.
static interface	IrqHandler.Interrupted	Callback issues on an interrupt.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CONTROL_C	Definition of the Control-C handler name: "INT".
static final String	SIGTERM	Definition of default kill signal: "TERM".

Constructor Summary

Constructors

Constructor	Description
IrqHandler(String name, IrqHandler.Interrupted handler)	Create an IRQ handler bound to the specific interrupt.

Method Summary

Modifier and Type	Method	Description
void	bind()	Bind to the interrupt handler.
String	getName()
int	getSignalCount()	Get the count of how many times a signal has been raised.
void	handle(SignalUtil.Signal s)	Handler for the JVM API for signal handling.
void	raise()	Raise the signal.
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

CONTROL_C

public static final String CONTROL_C

Definition of the Control-C handler name: "INT".

See Also:

• Constant Field Values

SIGTERM

public static final String SIGTERM

Definition of default kill signal: "TERM".

See Also:

• Constant Field Values

Constructor Details

IrqHandler

public IrqHandler(String name,
 IrqHandler.Interrupted handler)

Create an IRQ handler bound to the specific interrupt.

Parameters:

name - signal name

handler - handler

Method Details

bind

public void bind()

Bind to the interrupt handler.

Throws:

IllegalArgumentException - if the exception could not be set

getName

public String getName()

Returns:

the signal name.

raise

public void raise()

Raise the signal.

toString

public String toString()

Overrides:

toString in class Object

handle

public void handle(SignalUtil.Signal s)

Handler for the JVM API for signal handling.

Specified by:

handle in interface SignalUtil.Handler

Parameters:

s - signal raised

getSignalCount

public int getSignalCount()

Get the count of how many times a signal has been raised.

Returns:

the count of signals