//File:  VMachine.java
//CS 471 - Operating Systems Project
//Dennis Pereira, Ely Soto, John Cavalieri

//This class is the wrapper for the virtual machine programs.
//It provides the api pointer, name of user owner, argument array, a parent pointer,
//and its input and output handles.
//When a virtual machine is released it calls FinalizeVM() to perform necessary cleanup.


import java.util.Vector;

public class VMachine extends Thread
{
    public Handle IN;
    public Handle OUT;
    public Handle vmh; // Currently using the handle as the threadID
    public String owner;
    public String[] args;
    public VMachine Parent;
    public Vector child;
    public int undone;
    
    protected Sysapi sysapi;
    
    
    public VMachine()
    {//Only 0 parm constructor because .CreateInstance() method used
    }
    
    public void prepareVM(Handle newIN,Handle newOUT,Handle newvmh,String newowner,String[] newargs,VMachine newParent, Vector newchild,int newundone, Sysapi newsysapi)
    {
        IN = newIN;
        OUT = newOUT;
        vmh = newvmh;
        owner = newowner;
        args = newargs;
        Parent = newParent;
        
        if(newchild == null)
        {
            child = new Vector(5,1);
        }
        else
        {
            child = newchild;
        }
        undone = newundone;
        sysapi = newsysapi;
    }
    public void finalize()
    {
        sysapi.FinalizeVM(vmh);   
    }
}