Package au.csiro.pathling.utilities

Class ObjectHolder.SingletonHolder<C extends Serializable,V>

java.lang.Object

au.csiro.pathling.utilities.ObjectHolder.SingletonHolder<C,V>

Type Parameters:

C - the configuration type

V - the value type

All Implemented Interfaces:

ObjectHolder<C,V>, Closeable, AutoCloseable

Enclosing interface:

ObjectHolder<C extends Serializable,V>

public static class ObjectHolder.SingletonHolder<C extends Serializable,V>
extends Object
implements ObjectHolder<C,V>, Closeable

A singleton implementation of ObjectHolder that holds a single instance of something.

Nested Class Summary

Nested classes/interfaces inherited from interface au.csiro.pathling.utilities.ObjectHolder

ObjectHolder.SingletonHolder<C extends Serializable,V>

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_SHUTDOWN_HOOK_PRIORITY	The default priority of the shutdown hook.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this singleton and releases any system resources associated with it.
V	getOrCreate(C config)	Retrieves the instance associated with given configuration and if necessary creates ones.
void	reset()	Destroys all the instances stored the underlying scope.

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_SHUTDOWN_HOOK_PRIORITY

public static final int DEFAULT_SHUTDOWN_HOOK_PRIORITY

The default priority of the shutdown hook. This is set to be executed after the SparkContext shutdown hook (which has priority 50) and before temporary dirs are cleaned up (priority 25). See ShutdownHookManager for more info on Spark related shutdown hooks.

See Also:

• Constant Field Values

Method Details

getOrCreate

@Nonnull
public V getOrCreate(@Nonnull
 C config)

Description copied from interface: ObjectHolder

Retrieves the instance associated with given configuration and if necessary creates ones.

Specified by:

getOrCreate in interface ObjectHolder<C extends Serializable,V>

Parameters:

config - the configuration for the instance.

Returns:

the instance associated with the holder.

reset

public void reset()

Description copied from interface: ObjectHolder

Destroys all the instances stored the underlying scope.

Specified by:

reset in interface ObjectHolder<C extends Serializable,V>

close

public void close()

Closes this singleton and releases any system resources associated with it. If the singleton is already closed then invoking this method has no effect.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable