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java.lang.Object
   |
   +----java.lang.ClassLoader
           |
           +----edu.utah.janos.core.FlowClassLoader

Summary

final class  FlowClassLoader
     extends java.lang.ClassLoader
{
          // Fields 1
     private Hashtable bytecodeTable;

          // Constructors 1
     FlowClassLoader(ClassSpec[]);

          // Methods 2
     void addClass(String, byte[]);
     public synchronized Class loadClass(String, boolean) throws ClassNotFoundException;
}

Loads class files for a Flow. There are two kinds of classes for a FlowClassLoader: system classes and Flow classes. The Flow classes are specified when the FlowClassLoader is created by the array of ClassSpecs. Each ClassSpec specifies a name and an array of bytes. System classes are those loaded by the parent ClassLoader.

A FlowClassLoader tries to find all loaded classes from the already-loaded classes, then asks if its a system class, and finally, checks the Flow-specific classes.

Fields

· bytecodeTable

Summary  |  Top

   private Hashtable bytecodeTable

Constructors

· FlowClassLoader

Summary  |  Top

   FlowClassLoader(ClassSpec[] classSpecs) 

Make a deep copy of the ClassSpec and push into the table of name to bytecode mappings.

FlowClassLoaders are only created when a new Flow() is created. The ClassSpec elements have to be duplicated because the parameter is from the parent process's memory.

Parameter	Description
classSpecs	array of name and bytecode pairs.

   void addClass(String name, 
                 byte[] bytecode) 

Add a new class to an existing flow. This should be called from inside the flow that the class is being added to. Neither argument may be null.

   public synchronized Class loadClass(String name, 
                                       boolean resolve)  throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

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