TypeClassCacheFunc (java-gi API)

All Superinterfaces:: FunctionPointer

Functional Interface:: This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface @Generated("io.github.jwharm.JavaGI") public interface TypeClassCacheFunc extends FunctionPointer

Functional interface declaration of the TypeClassCacheFunc callback.

See Also:

Method Summary

Modifier and Type

Method

Description

boolean

run(@Nullable MemorySegment cacheData, TypeClass gClass)

A callback function which is called when the reference count of a class drops to zero.

default MemorySegment

toCallback(Arena arena)

Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.

default int

upcall(MemorySegment cacheData, MemorySegment gClass)

The upcall method is called from native code.

Method Details
- run
  
  boolean run(@Nullable @Nullable MemorySegment cacheData, TypeClass gClass)
  
  A callback function which is called when the reference count of a class drops to zero.
  It may use g_type_class_ref() to prevent the class from being freed. You should not call g_type_class_unref() from a GTypeClassCacheFunc function to prevent infinite recursion, use g_type_class_unref_uncached() instead.
  The functions have to check the class id passed in to figure whether they actually want to cache the class of this type, since all classes are routed through the same GTypeClassCacheFunc chain.
- upcall
  
  default int upcall(MemorySegment cacheData, MemorySegment gClass)
  
  The upcall method is called from native code. The parameters are marshaled and run(java.lang.foreign.MemorySegment, org.gnome.gobject.TypeClass) is executed.
- toCallback
  
  default MemorySegment toCallback(Arena arena)
  
  Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.
  
  Specified by:
  
  toCallback in interface FunctionPointer
  
  Parameters:
  
  arena - the function pointer will be allocated in this arena
  
  Returns:
  
  the native function pointer