org.freedesktop.monado.auxiliary.NativeCounterpart Class Reference

Object that tracks the native counterpart object for a type. More...

Public Member Functions
	NativeCounterpart (long nativePointer) throws InvalidParameterException
	Constructor.
void	markAsUsedByNativeCode ()
	Set the flag to indicate that native code is using this.
void	markAsDiscardedByNative (String TAG)
	Change the flag and notify those waiting on it, to indicate that native code is done with this object.
long	getNativePointer ()
	Retrieve the native pointer value.
boolean	blockUntilNativeDiscard (@NonNull String TAG)
	Wait until markAsDiscardedByNative has been called indicating that the native code is done with this.

Detailed Description

Object that tracks the native counterpart object for a type.

Must be initialized on construction, and may have its native code destroyed/discarded, but may not "re-seat" it to new native code pointer.

Use as a member of any type with a native counterpart (a native-allocated-and-owned object that holds a reference to the owning class). Include the following field and delegating method to use (note: assumes you have a tag for logging purposes as TAG)

private final NativeCounterpart nativeCounterpart;

@Keep
public void markAsDiscardedByNative() {
    nativeCounterpart.markAsDiscardedByNative(TAG);
}

Then, initialize it in your constructor, call markAsUsedByNativeCode() where desired (often in your constructor), and call getNativePointer() and
blockUntilNativeDiscard() as needed.

Your native code can use this to turn a void* into a jlong: static_cast<long
long>(reinterpret_cast<intptr_t>(nativePointer))

Constructor & Destructor Documentation

NativeCounterpart()

org.freedesktop.monado.auxiliary.NativeCounterpart.NativeCounterpart ( long  nativePointer ) throws InvalidParameterException

inline

Constructor.

Parameters

nativePointer

The native pointer, cast appropriately. Must be non-zero. Can cast like: static_cast<long long>(reinterpret_cast<intptr_t>(nativePointer))

Member Function Documentation

blockUntilNativeDiscard()

boolean org.freedesktop.monado.auxiliary.NativeCounterpart.blockUntilNativeDiscard ( @NonNull String  TAG )

inline

Wait until markAsDiscardedByNative has been called indicating that the native code is done with this.

Be sure to check the result!

Parameters

TAG	Your owning class's logging tag

Returns

true if this class has successfully been discarded by native.

getNativePointer()

long org.freedesktop.monado.auxiliary.NativeCounterpart.getNativePointer ( )

inline

Retrieve the native pointer value.

Will be 0 if discarded by native code!.

Returns

pointer (cast as a long)

markAsDiscardedByNative()

void org.freedesktop.monado.auxiliary.NativeCounterpart.markAsDiscardedByNative ( String  TAG )

inline

Change the flag and notify those waiting on it, to indicate that native code is done with this object.

Parameters

TAG	Your owning class's logging tag

Referenced by org.freedesktop.monado.auxiliary.MonadoView.markAsDiscardedByNative().

markAsUsedByNativeCode()

void org.freedesktop.monado.auxiliary.NativeCounterpart.markAsUsedByNativeCode ( )

inline

Set the flag to indicate that native code is using this.

Only call this once, probably in your constructor unless you have a good reason to call it elsewhere.

Referenced by org.freedesktop.monado.auxiliary.MonadoView.waitGetSurfaceHolder().

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The documentation for this class was generated from the following file:

• auxiliary/android/src/main/java/org/freedesktop/monado/auxiliary/NativeCounterpart.java