org.crosswire.common.activate
Class Activator

java.lang.Object
  org.crosswire.common.activate.Activator

public final class Activator
extends Object

Manager for instances of Activatable. Activator should be used to manage all activate()ions and deactivate()ions so that it can keep a track of exactly what is active and what can be deactivated is save memory.

Author:

Joe Walker

See Also:

The GNU Lesser General Public License for details.

Field Summary

private static Set<Activatable>	activated The list of things that we have activated
private static Lock	lock The object we use to prevent others from

Constructor Summary

private

Activator() Prevent instantiation

Method Summary

static void	activate(Activatable subject) Check that a subject is activated and call activate() if not.
static void	deactivate(Activatable subject) Deactivate an Activatable object.
static void	deactivateAll()
static void	reduceMemoryUsage(Kill amount) If we need to tighten things up a bit we can save memory with this

Methods inherited from class java.lang.Object

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

Field Detail

activated

private static Set<Activatable> activated

The list of things that we have activated

lock

private static Lock lock

The object we use to prevent others from

Constructor Detail

Activator

private Activator()

Prevent instantiation

Method Detail

activate

public static void activate(Activatable subject)

Check that a subject is activated and call activate() if not.

Parameters:

subject - The thing to activate

reduceMemoryUsage

public static void reduceMemoryUsage(Kill amount)

If we need to tighten things up a bit we can save memory with this

Parameters:

amount - the amount by which to to reduce memory

deactivate

public static void deactivate(Activatable subject)

Deactivate an Activatable object. It is safe to activate() something and then forget to deactivate() it since we keep a track of activated objects and will automatically deactivate() when needed, so this method should only be used when we are sure that something will not be needed again.

Parameters:

subject - The thing to deactivate

deactivateAll

public static void deactivateAll()