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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package com.sun.xml.ws.client;

import com.sun.xml.ws.util.CompletedFuture;

import javax.xml.ws.AsyncHandler;
import javax.xml.ws.Response;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;

/**
 * {@link Response} implementation.
 *
 * @author Kohsuke Kawaguchi
 * @author Kathy Walsh
 */
public final class ResponseImpl extends FutureTask implements Response, ResponseContextReceiver {

    /**
     * Optional {@link AsyncHandler} that gets invoked
     * at the completion of the task.
     */
    private final AsyncHandler handler;
    private ResponseContext responseContext;

    private final Callable callable;

    /**
     *
     * @param callable
     *      This {@link Callable} is executed asynchronously.
     * @param handler
     *      Optional {@link AsyncHandler} to invoke at the end
     *      of the processing. Can be null.
     */
    public ResponseImpl(Callable callable, AsyncHandler handler) {
        super(callable);
        this.callable = callable;
        this.handler = handler;
    }

    @Override
    public void run() {
        // override so that we call set()
        try {
            set(callable.call(), null);
        } catch (Throwable t) {
            set(null, t);
        }
    }
    
    protected void set(final T v, final Throwable t) {
        // call the handler before we mark the future as 'done'
        if (handler!=null) {
            try {
                /**
                 * {@link Response} object passed into the callback.
                 * We need a separate {@link Future} because we don't want {@link ResponseImpl}
                 * to be marked as 'done' before the callback finishes execution.
                 * (That would provide implicit synchronization between the application code
                 * in the main thread and the callback code, and is compatible with the JAX-RI 2.0 FCS.
                 */
                class CallbackFuture extends CompletedFuture implements Response {
                    public CallbackFuture(T v, Throwable t) {
                        super(v, t);
                    }

                    public Map getContext() {
                        return ResponseImpl.this.getContext();
                    }
                }
                handler.handleResponse(new CallbackFuture(v, t));
            } catch (Throwable e) {
                super.setException(e);
                return;
            }
        }
        if (t != null) {
            super.setException(t); 
        } else {
            super.set(v);
        }
    }

    public ResponseContext getContext() {
        return responseContext;
    }

    public void setResponseContext(ResponseContext rc) {
        responseContext = rc;
    }
}




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