com.kenai.jffi

Class ClosureManager

java.lang.Object

com.kenai.jffi.ClosureManager

public final class ClosureManager
extends java.lang.Object

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

Nested Class Summary

Nested Classes

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

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Map<CallContext,java.lang.ref.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 and Description
private	ClosureManager() Constructs a ClosureManager

Method Summary

Modifier and Type	Method and Description
ClosurePool	getClosurePool(CallContext callContext)
static ClosureManager	getInstance() Gets the global instance of the ClosureManager
Closure.Handle	newClosure(Closure closure, CallContext callContext) Wraps a java object that implements the Closure interface in a native closure.
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, java.lang.reflect.Method method)

Methods inherited from class java.lang.Object

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

Field Detail

poolMap

private final java.util.Map<CallContext,java.lang.ref.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 Detail

ClosureManager

private ClosureManager()

Constructs a ClosureManager

Method Detail

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,
                                          java.lang.reflect.Method method)