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 * 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_1_1.html
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package org.glassfish.grizzly.http2;

import java.io.IOException;
import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.CompletionHandler;
import org.glassfish.grizzly.WriteHandler;
import org.glassfish.grizzly.WriteResult;
import org.glassfish.grizzly.asyncqueue.MessageCloner;
import org.glassfish.grizzly.filterchain.FilterChainContext;
import org.glassfish.grizzly.http.HttpPacket;

/**
 * The {@link StreamOutputSink} implementation, which is used when upgrading
 * HTTP -> HTTP/2 connections.
 * 
 * @author Alexey Stashok
 */
public class UpgradeOutputSink implements StreamOutputSink {
    private final Http2Connection connection;
    private boolean isClosed;

    public UpgradeOutputSink(Http2Connection connection) {
        this.connection = connection;
    }
    
    @Override
    public boolean canWrite() {
        return connection.getConnection().canWrite();
    }

    @Override
    public void notifyWritePossible(WriteHandler writeHandler) {
        connection.getConnection().notifyCanWrite(writeHandler);
    }

    @Override
    public void onPeerWindowUpdate(int delta) throws Http2StreamException {
    }

    @Override
    public  void writeDownStream(HttpPacket httpPacket, FilterChainContext ctx, CompletionHandler completionHandler, MessageCloner messageCloner) throws IOException {
        throw new UnsupportedOperationException("Not supported");
    }

    @Override
    public void writeDownStream(Source source, FilterChainContext ctx) throws IOException {
        throw new UnsupportedOperationException("Not supported");
    }

    @Override
    public void flush(CompletionHandler completionHandler) {
        throw new UnsupportedOperationException("Not supported");
    }

    @Override
    public int getUnflushedWritesCount() {
        return 0;
    }

    @Override
    public void close() {
        terminate(null);
    }

    @Override
    public void terminate(Http2Stream.Termination termination) {
        synchronized (this) {
            if (isClosed) {
                return;
            }
            
            isClosed = true;
        }
        
        termination.doTask();
    }

    @Override
    public synchronized boolean isClosed() {
        return isClosed;
    }
}