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package com.sun.enterprise.iiop.security;

import java.util.Hashtable;

/**
 * This class that implements ConnectionExecutionContext that gets 
 * stored in Thread Local Storage. If the current thread creates
 * child threads, the context info that is  stored in the current 
 * thread is automatically propogated to the child threads.
 * 
 * Two class methods serve as a convinient way to set/get the 
 * Context information within the current thread.   
 *
 * Thread Local Storage is a concept introduced in JDK1.2. So, it
 * will not work on earlier releases of JDK.
 *
 * @see java.lang.ThreadLocal
 * @see java.lang.InheritableThreadLocal
 * 
 */
public class ConnectionExecutionContext {
    private static final InheritableThreadLocal connCurrent= new InheritableThreadLocal();
    // XXX: Workaround for non-null connection object ri for local invocation.
    private static final InheritableThreadLocal ClientThreadID = new InheritableThreadLocal();

    public static Long readClientThreadID() {
        Long ID = ClientThreadID.get();
        //ClientThreadID.remove();
        return ID;
    }

    public static void setClientThreadID(Long ClientThreadID) {
        ConnectionExecutionContext.ClientThreadID.set(ClientThreadID);
    }

    public static void removeClientThreadID() {
        ClientThreadID.remove();
    }

    /** 
     * This method can be used to add a new hashtable for storing the 
     * Thread specific context information. This method is useful to add a 
     * deserialized Context information that arrived over the wire.
     * @param A hashtable that stores the current thread's context
     * information.
     */
    public static void setContext(Hashtable ctxTable) {
        if (ctxTable != null) {
            connCurrent.set(ctxTable);
        } else {
            connCurrent.set(new Hashtable());
        }
    }

    /**
     * This method returns the hashtable that stores the thread specific
     * Context information.
     * @return The Context object stored in the current TLS. It always 
     * returns a non null value;
     */
    public static Hashtable getContext() {
         if (connCurrent.get() == null) {
             setContext(null); // Create a new one...
         } 
         return (Hashtable) connCurrent.get();
    }
}