Class ClosureManager

java.lang.Object

com.kenai.jffi.ClosureManager

public final class ClosureManager
extends Object

Allocates and manages the lifecycle of native closures (aka callbacks)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	ClosureManager.SingletonHolder	Holder class to do lazy allocation of the ClosureManager instance

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<CallContext, Reference<ClosurePool>>	poolMap	ClosurePool instances are linked via a SoftReference in the lookup map, so when all closure instances that that were allocated from the ClosurePool have been reclaimed, and there is memory pressure, the native closure pool can be freed.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ClosureManager()	Constructs a ClosureManager

Method Summary

Modifier and Type	Method	Description
final ClosurePool	getClosurePool(CallContext callContext)
static ClosureManager	getInstance()	Gets the global instance of the ClosureManager
final Closure.Handle	newClosure(Closure closure, CallContext callContext)	Wraps a java object that implements the Closure interface in a native closure.
final Closure.Handle	newClosure(Closure closure, Type returnType, Type[] parameterTypes, CallingConvention convention)	Wraps a java object that implements the Closure interface in a native closure.
ClosureMagazine	newClosureMagazine(CallContext callContext, Method method)

Methods inherited from class Object

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

Field Details

poolMap

private final Map<CallContext, Reference<ClosurePool>> poolMap

ClosurePool instances are linked via a SoftReference in the lookup map, so when all closure instances that that were allocated from the ClosurePool have been reclaimed, and there is memory pressure, the native closure pool can be freed. This will allow the CallContext instance to also be collected if it is not strongly referenced elsewhere, and ejected from the CallContextCache

Constructor Details

ClosureManager

private ClosureManager()

Constructs a ClosureManager

Method Details

getInstance

public static ClosureManager getInstance()

Gets the global instance of the ClosureManager

Returns:

An instance of a ClosureManager

newClosure

public final Closure.Handle newClosure(Closure closure,
 Type returnType,
 Type[] parameterTypes,
 CallingConvention convention)

Wraps a java object that implements the Closure interface in a native closure.

Parameters:

closure - The java object to be called when the native closure is invoked.

returnType - The return type of the closure.

parameterTypes - The parameter types of the closure.

convention - The calling convention of the closure.

Returns:

A new Closure.Handle instance.

newClosure

public final Closure.Handle newClosure(Closure closure,
 CallContext callContext)

Wraps a java object that implements the Closure interface in a native closure.

Parameters:

closure - The java object to be called when the native closure is invoked.

callContext - The call context (return type, param types, convention) of the Closure

Returns:

A new Closure.Handle instance.

getClosurePool

public final ClosurePool getClosurePool(CallContext callContext)

newClosureMagazine

public ClosureMagazine newClosureMagazine(CallContext callContext,
 Method method)