[JOS-Kernel] LangBridge example

[Gilbert Carl Herschberger II]

Here is an example of a BCNI-compatible bridge for the java.lang package:

package alt;

public interface LangBridge {
  public abstract Object ClassForName( String className );
  public abstract String ClassGetName( Object o );
  public abstract boolean ClassIsInterface( Object o );
  public abstract Object ClassGetSuperclass( Object o );
  public abstract Object[] ClassGetInterfaces( Object o );
  public abstract ClassLoader ClassGetClassLoader( Object o );
  public abstract Object ClassNewInstance( Object o );

  public abstract Object[] ThrowableGetStackTrace( Object o );

  public abstract Class ClassLoaderDefineClass( Object o, byte[] data, int
offset, int length );
  public abstract void ClassLoaderResolveClass( Object o, Class c );
  public abstract Class ClassLoaderFindSystemClass( Object o, String
className );

  public abstract Class ObjectGetClass( Object o );
  public abstract void ObjectNotify( Object o )
      throws IllegalMonitorStateException;
  public abstract void ObjectNotifyAll( Object o )
      throws IllegalMonitorStateException;
  public abstract void ObjectWait( Object o, long millis, int nanos )
      throws IllegalMonitorStateException, InterruptedException;
  public abstract int ObjectHashCode( Object o );
  public abstract Object ObjectClone( Object o )
      throws CloneNotSupportedException;

  public abstract Class[] SecurityManagerGetClassContext( Object o );

  public abstract String[] SystemGetVMProperties();
  public abstract String SystemDefaultPropertiesFile();
  public abstract String[] SystemGetCommandLineProperties();
  public abstract long SystemCurrentTimeMillis();

  public abstract Thread ThreadCurrentThread();
  public abstract void ThreadSleep(long millis, int nanos) 
      throws InterruptedException;
  public abstract void ThreadYield();
  public abstract void ThreadSetThreadState( Object o, int state );
  public abstract int ThreadCountStackFrames( Object o );
  public abstract void ThreadStop( Object o, Throwable error );
  public abstract void ThreadSetPriority(int priority);
}

This interface is implemented by a JVM-specific class, such as
decaf.BasicLangBridge. It is returned by a generic BCNI factory, like this:

String in = "alt.LangBridge";
LangBridge bridge = (LangBridge) Factory.getFactory().getObject( in );

You ask the BCNI factory for an interface; it gives you the JVM-specific
implementation of that interface. Once you have the interface, you can use
it to perform functions supported by a virtual machine.

BCNI supports well-known interfaces, like alt.LangBridge. Plus, it is
open-ended. It support JVM-specific interfaces to JVM-specific classes, too.

Because it is open-ended, it supports all platforms:

Java 0, Java 1, Java 2, Java 3, Java 4, etc.


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