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 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
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 * 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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 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
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package com.sun.grizzly.nio.tmpselectors;

import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import com.sun.grizzly.AbstractWriter;
import com.sun.grizzly.Buffer;
import com.sun.grizzly.CompletionHandler;
import com.sun.grizzly.Connection;
import com.sun.grizzly.Grizzly;
import com.sun.grizzly.Interceptor;
import com.sun.grizzly.WriteResult;
import com.sun.grizzly.impl.ReadyFutureImpl;
import com.sun.grizzly.nio.NIOConnection;

/**
 *
 * @author oleksiys
 */
public abstract class TemporarySelectorWriter
        extends AbstractWriter {

    private static final int DEFAULT_TIMEOUT = 30000;

    private Logger logger = Grizzly.logger;

    protected final TemporarySelectorsEnabledTransport transport;

    private int timeoutMillis = DEFAULT_TIMEOUT;

    public TemporarySelectorWriter(
            TemporarySelectorsEnabledTransport transport) {
        this.transport = transport;
    }

    public int getTimeout() {
        return timeoutMillis;
    }

    public void setTimeout(int timeout) {
        this.timeoutMillis = timeout;
    }

    /**
     * {@inheritDoc}
     */
    public Future> write(
            Connection connection, SocketAddress dstAddress,
            Buffer buffer,
            CompletionHandler> completionHandler,
            Interceptor interceptor)
            throws IOException {
        return write(connection, dstAddress, buffer, completionHandler,
                interceptor, timeoutMillis, TimeUnit.MILLISECONDS);
    }


    /**
     * Method writes the message to the specific address.
     *
     * @param connection the {@link Connection} to write to
     * @param dstAddress the destination address the message will be
     *        sent to
     * @param message the message, from which the data will be written
     * @param completionHandler {@link CompletionHandler},
     *        which will get notified, when write will be completed
     * @return {@link Future}, using which it's possible to check the
     *         result
     * @throws java.io.IOException
     */
    public Future> write(
            Connection connection, SocketAddress dstAddress,
            Buffer buffer,
            CompletionHandler> completionHandler,
            Interceptor interceptor,
            long timeout, TimeUnit timeunit) throws IOException {

        if (buffer == null) {
            throw new IllegalStateException("Message cannot be null.");
        }

        if (connection == null || !(connection instanceof NIOConnection)) {
            throw new IllegalStateException(
                    "Connection should be NIOConnection and cannot be null.");
        }

        WriteResult writeResult =
                new WriteResult(connection, buffer,dstAddress, 0);

        write0(connection, dstAddress, buffer, writeResult,
                timeout, timeunit);

        writeResult.setMessage(buffer);
        Future> writeFuture =
                new ReadyFutureImpl(writeResult);
        
        if (completionHandler != null) {
            completionHandler.completed(connection, writeResult);
        }

        return writeFuture;
    }

    /**
     * Flush the buffer by looping until the {@link Buffer} is empty
     * @param channel {@link SelectableChannel}
     * @param bb the Buffer to write.
     * @return The number of bytes written
     * @throws java.io.IOException
     */
    protected int write0(Connection connection,
            SocketAddress dstAddress, Buffer buffer, WriteResult currentResult,
            long timeout, TimeUnit timeunit) throws IOException {

        NIOConnection nioConnection = (NIOConnection) connection;
        SelectableChannel channel = nioConnection.getChannel();
        long writeTimeout = TimeUnit.MILLISECONDS.convert(timeout, timeunit);

        SelectionKey key = null;
        Selector writeSelector = null;
        int attempts = 0;
        int bytesWritten = 0;

        try {
            while (buffer.hasRemaining()) {
                int len = writeNow0(connection, dstAddress, buffer,
                        currentResult);

                if (len > 0) {
                    attempts = 0;
                    bytesWritten += len;
                } else {
                    attempts++;
                    if (writeSelector == null) {
                        writeSelector = transport.getTemporarySelectorIO().
                                getSelectorPool().poll();

                        if (writeSelector == null) {
                            // Continue using the main one.
                            continue;
                        }
                        key = channel.register(writeSelector,
                                SelectionKey.OP_WRITE);
                    }

                    if (writeSelector.select(writeTimeout) == 0) {
                        if (attempts > 2) {
                            throw new IOException("Client disconnected");
                        }
                    }
                }
            }
        } finally {
            transport.getTemporarySelectorIO().recycleTemporaryArtifacts(
                    writeSelector, key);
        }
        
        return bytesWritten;
    }

    public TemporarySelectorsEnabledTransport getTransport() {
        return transport;
    }

    protected abstract int writeNow0(Connection connection,
            SocketAddress dstAddress, Buffer buffer, WriteResult currentResult)
            throws IOException;
}