org.zeroturnaround.exec.listener

Class ShutdownHookProcessDestroyer

java.lang.Object

org.zeroturnaround.exec.listener.ShutdownHookProcessDestroyer

All Implemented Interfaces:

Runnable, ProcessDestroyer

public class ShutdownHookProcessDestroyer
extends Object
implements ProcessDestroyer, Runnable

Destroys all registered Processes when the VM exits.

This class is copied from Commons Exec.

Field Summary

Fields

Modifier and Type	Field and Description
static ProcessDestroyer	INSTANCE Singleton instance of the ShutdownHookProcessDestroyer.

Constructor Summary

Constructors

Constructor and Description
ShutdownHookProcessDestroyer() Constructs a ProcessDestroyer and obtains Runtime.addShutdownHook() and Runtime.removeShutdownHook() through reflection.

Method Summary

Modifier and Type	Method and Description
boolean	add(Process process) Returns true if the specified Process was successfully added to the list of processes to destroy upon VM exit.
boolean	isAddedAsShutdownHook() Returns whether or not the ProcessDestroyer is registered as as shutdown hook
boolean	remove(Process process) Returns true if the specified Process was successfully removed from the list of processes to destroy upon VM exit.
void	run() Invoked by the VM when it is exiting.
int	size() Returns the number of registered processes.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final ProcessDestroyer INSTANCE

Singleton instance of the ShutdownHookProcessDestroyer.

Constructor Detail

ShutdownHookProcessDestroyer

public ShutdownHookProcessDestroyer()

Constructs a ProcessDestroyer and obtains Runtime.addShutdownHook() and Runtime.removeShutdownHook() through reflection. The ProcessDestroyer manages a list of processes to be destroyed when the VM exits. If a process is added when the list is empty, this ProcessDestroyer is registered as a shutdown hook. If removing a process results in an empty list, the ProcessDestroyer is removed as a shutdown hook.

Method Detail

isAddedAsShutdownHook

public boolean isAddedAsShutdownHook()

Returns whether or not the ProcessDestroyer is registered as as shutdown hook

Returns:

true if this is currently added as shutdown hook

add

public boolean add(Process process)

Returns true if the specified Process was successfully added to the list of processes to destroy upon VM exit.

Specified by:

add in interface ProcessDestroyer

Parameters:

process - the process to add

Returns:

true if the specified Process was successfully added

remove

public boolean remove(Process process)

Returns true if the specified Process was successfully removed from the list of processes to destroy upon VM exit.

Specified by:

remove in interface ProcessDestroyer

Parameters:

process - the process to remove

Returns:

true if the specified Process was successfully removed

size

public int size()

Returns the number of registered processes.

Specified by:

size in interface ProcessDestroyer

Returns:

the number of register process

run

public void run()

Invoked by the VM when it is exiting.

Specified by:

run in interface Runnable