com.goldencode.p2j.main

Class OrderedShutdownHooks

java.lang.Object

com.goldencode.p2j.main.OrderedShutdownHooks

public class OrderedShutdownHooks
extends java.lang.Object

This class ensures that registered hooks are run in a specified order of priority when the JVM shuts down. It uses a singleton pattern to maintain a single instance and a list of hooks that are sorted and executed based on their priority. The shutdown hooks are executed automatically when the JVM shuts down.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	OrderedShutdownHooks.ShutdownHook Class representing a shutdown hook.

Field Summary

Fields

Modifier and Type	Field and Description
private static OrderedShutdownHooks	instance Singleton instance
private static CentralLogger	LOG Logger.
private static java.util.List<OrderedShutdownHooks.ShutdownHook>	shutdownHooks List of hooks to be handled at server shutdown

Constructor Summary

Constructors

Modifier	Constructor and Description
private	OrderedShutdownHooks() Private constructor to prevent instantiation from outside the class.

Method Summary

Modifier and Type	Method and Description
static void	deregisterShutdownHook(int priority, java.lang.Runnable action) Deregisters a shutdown hook with a specified priority.
private void	executeShutdownHooks() Executes all registered shutdown hooks in the order of their priority.
private static void	getInstance() Returns the singleton instance of OrderedShutdownHooks.
static void	registerShutdownHook(int priority, java.lang.Runnable action) Registers a new shutdown hook with a specified priority.

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final CentralLogger LOG

Logger.

instance

private static OrderedShutdownHooks instance

Singleton instance

shutdownHooks

private static final java.util.List<OrderedShutdownHooks.ShutdownHook> shutdownHooks

List of hooks to be handled at server shutdown

Constructor Detail

OrderedShutdownHooks

private OrderedShutdownHooks()

Private constructor to prevent instantiation from outside the class.

Method Detail

getInstance

private static void getInstance()

Returns the singleton instance of OrderedShutdownHooks. If the instance is not already created, it creates a new instance and registers a shutdown hook to execute the registered actions in the defined order.

registerShutdownHook

public static void registerShutdownHook(int priority,
                                        java.lang.Runnable action)

Registers a new shutdown hook with a specified priority. The hooks will be executed in ascending order of their priority values.

Parameters:

priority - The priority of the shutdown hook.

action - The Runnable action to be executed during shutdown.

deregisterShutdownHook

public static void deregisterShutdownHook(int priority,
                                          java.lang.Runnable action)

Deregisters a shutdown hook with a specified priority.

Parameters:

priority - The priority of the shutdown hook.

action - The Runnable action to be executed during shutdown.

executeShutdownHooks

private void executeShutdownHooks()

Executes all registered shutdown hooks in the order of their priority. Hooks with lower priority values are executed first.