com.apple.mrj.jdirect
Class MethodClosure

java.lang.Object
  |
  +--com.apple.mrj.jdirect.MethodClosure

public class MethodClosure

extends Object

A MethodClosure is a thunk which enables a shared library to call into Java.
The MethodClosure constructor is given the object, method, and signature of the method to be called. The method getProc() returns a C function pointer that can be called by a shared library to invoke the specified java method.

Field Summary

static boolean	DONT_MAINTAIN_CARBONLOCK
static boolean	MAINTAIN_CARBONLCOK

Constructor Summary

protected	MethodClosure(Object targetObject, String methodName, String methodSignature)
protected	MethodClosure(Object targetObject, String methodName, String methodSignature, boolean unlockAroundClosure) Constructs a closure thunk that C code can call to invoke a particular method on a particular object.

Method Summary

void	dispose() You must maintain a reference to this object and call the dispose method when you want the closure thunk in the app's heap to be freed.
int	getProc() Returns a C function pointer

Methods inherited from class java.lang.Object

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

Field Detail

MAINTAIN_CARBONLCOK

public static final boolean MAINTAIN_CARBONLCOK

DONT_MAINTAIN_CARBONLOCK

public static final boolean DONT_MAINTAIN_CARBONLOCK

Constructor Detail

MethodClosure

protected MethodClosure(Object targetObject,
                        String methodName,
                        String methodSignature)

MethodClosure

protected MethodClosure(Object targetObject,
                        String methodName,
                        String methodSignature,
                        boolean unlockAroundClosure)

Constructs a closure thunk that C code can call to invoke a particular method on a particular object. The closure allocates a small block of memory in the application's MacOS heap. The closure also maintains a reference to targetObject to prevent it from being garbage collected.

Parameters:

targetObject - the object whose method will be called (cannot be this).

methodName - the name of the method to be called

methodSignature - the signature (e.g. "(II)V") of the method to be called

Method Detail

dispose

public void dispose()

You must maintain a reference to this object and call the dispose method when you want the closure thunk in the app's heap to be freed.

getProc

public int getProc()

Returns a C function pointer

Returns:

an int which can be passed to a shared library and cast to a C function pointer