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package org.glassfish.jersey.servlet.internal;

import java.lang.reflect.Method;

import javax.naming.Context;
import javax.naming.InitialContext;

/**
 * A proxy invocation handler that delegates all methods to a thread local instance from JNDI.
 *
 * @author Paul Sandoz (paul.sandoz at oracle.com)
 */
public class ThreadLocalNamedInvoker extends ThreadLocalInvoker {

    private final String name;

    /**
     * Create an instance.
     *
     * @param name the JNDI name at which an instance of T can be found.
     */
    public ThreadLocalNamedInvoker(final String name) {
        this.name = name;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        // if no instance yet exists for the current thread then look one up and stash it
        if (this.get() == null) {
            Context ctx = new InitialContext();
            T t = (T) ctx.lookup(name);
            this.set(t);
        }
        return super.invoke(proxy,method,args);
    }
}