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com.kenai.jffi

public final Class NativeMethods

extends Object
Class Inheritance
Imports
java.util.ArrayList, .List, .Map, .WeakHashMap, java.util.logging.Level, .Logger
Utility class to register native methods on a class

Nested and Inner Type Summary

Modifier and TypeClass and Description
private static class
NativeMethods.ResourceHolder

Field Summary

Modifier and TypeField and Description
private final NativeMethods.ResourceHolder
memory

private static final Map<Class<T>, NativeMethods>
registeredMethods

Store a link from the class to the native method holder in a weak hash map, so as long as the class remains alive, the native memory for the structures remains alive.

Constructor Summary

AccessConstructor and Description
private
NativeMethods(NativeMethods.ResourceHolder memory)

Method Summary

Modifier and TypeMethod and Description
public static final synchronized void
register(Class<T>
The java class to register the native methods for.
clazz, List<NativeMethod>
The list of methods to attach to the class.
methods)

Registers the native methods for a class.

public static final synchronized void
unregister(Class<T>
The class to unregister the native methods on.
clazz)

Removes all native method attachments for the specified class.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

memoryback to summary
private final NativeMethods.ResourceHolder memory
registeredMethodsback to summary
private static final Map<Class<T>, NativeMethods> registeredMethods

Store a link from the class to the native method holder in a weak hash map, so as long as the class remains alive, the native memory for the structures remains alive. This doesn't seem to be necessary on sun's jvm, but best do it to be safe.

Constructor Detail

NativeMethodsback to summary
private NativeMethods(NativeMethods.ResourceHolder memory)

Method Detail

registerback to summary
public static final synchronized void register(Class<T> clazz, List<NativeMethod> methods)

Registers the native methods for a class.

Parameters
clazz:Class<T>

The java class to register the native methods for.

methods:List<NativeMethod>

The list of methods to attach to the class.

unregisterback to summary
public static final synchronized void unregister(Class<T> clazz)

Removes all native method attachments for the specified class.

Parameters
clazz:Class<T>

The class to unregister the native methods on.

com.kenai.jffi back to summary

private final Class NativeMethods.ResourceHolder

extends Object
Class Inheritance

Field Summary

Modifier and TypeField and Description
private final long
memory

private final MemoryIO
mm

Constructor Summary

AccessConstructor and Description
public
ResourceHolder(MemoryIO mm, long memory)

Method Summary

Modifier and TypeMethod and Description
protected void
finalize()

Overrides java.lang.Object.finalize.

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
Inherited from java.lang.Object:
cloneequalsgetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

memoryback to summary
private final long memory
mmback to summary
private final MemoryIO mm

Constructor Detail

ResourceHolderback to summary
public ResourceHolder(MemoryIO mm, long memory)

Method Detail

finalizeback to summary
protected void finalize() throws Throwable

Overrides java.lang.Object.finalize.

Doc from java.lang.Object.finalize.

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup.

When running in a Java virtual machine in which finalization has been disabled or removed, the garbage collector will never call finalize(). In a Java virtual machine in which finalization is enabled, the garbage collector might call finalize only after an indefinite delay.

The general contract of finalize is that it is invoked if and when the Java virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The finalize method may take any action, including making this object available again to other threads; the usual purpose of finalize, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition.

The Java programming language does not guarantee which thread will invoke the finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The finalize method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the finalize method causes the finalization of this object to be halted, but is otherwise ignored.

Annotations
@Override
Exceptions
Throwable:
the Exception raised by this method