/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package jdk.internal.net.rdma;

import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.net.Socket;
import java.net.SocketException;

class RdmaSocketOutputStream extends FileOutputStream
{
    static {
        init();
    }

    private RdmaSocketImpl impl = null;
    private byte temp[] = new byte[1];
    private Socket socket = null;

    RdmaSocketOutputStream(RdmaSocketImpl impl) throws IOException {
        super(impl.getFileDescriptor());
        this.impl = impl;
        socket = impl.getSocket();
    }

    public final FileChannel getChannel() {
        return null;
    }

    /**
     * Writes to the socket.
     * @param fd the FileDescriptor
     * @param b the data to be written
     * @param off the start offset in the data
     * @param len the number of bytes that are written
     * @exception IOException If an I/O error has occurred.
     */
    private native void rdmaSocketWrite0(FileDescriptor fd, byte[] b,
            int off, int len) throws IOException;

    /**
     * Writes to the socket with appropriate locking of the
     * FileDescriptor.
     * @param b the data to be written
     * @param off the start offset in the data
     * @param len the number of bytes that are written
     * @exception IOException If an I/O error has occurred.
     */
    private void rdmaSocketWrite(byte b[], int off, int len)
            throws IOException {
        if (len <= 0 || off < 0 || len > b.length - off) {
            if (len == 0) {
                return;
            }
            throw new ArrayIndexOutOfBoundsException("len == " + len
                    + " off == " + off + " buffer length == " + b.length);
        }

        FileDescriptor fd = impl.acquireFD();
        try {
            rdmaSocketWrite0(fd, b, off, len);
        } catch (SocketException se) {
            if (se instanceof sun.net.ConnectionResetException) {
                impl.setConnectionResetPending();
                se = new SocketException("Connection reset");
            }
            if (impl.isClosedOrPending()) {
                throw new SocketException("Socket closed");
            } else {
                throw se;
            }
        } finally {
            impl.releaseFD();
        }
    }

    /**
     * Writes a byte to the socket.
     * @param b the data to be written
     * @exception IOException If an I/O error has occurred.
     */
    public void write(int b) throws IOException {
        temp[0] = (byte)b;
        rdmaSocketWrite(temp, 0, 1);
    }

    /**
     * Writes the contents of the buffer <i>b</i> to the socket.
     * @param b the data to be written
     * @exception SocketException If an I/O error has occurred.
     */
    public void write(byte b[]) throws IOException {
        rdmaSocketWrite(b, 0, b.length);
    }

    /**
     * Writes <i>length</i> bytes from buffer <i>b</i> starting at
     * offset <i>len</i>.
     * @param b the data to be written
     * @param off the start offset in the data
     * @param len the number of bytes that are written
     * @exception SocketException If an I/O error has occurred.
     */
    public void write(byte b[], int off, int len) throws IOException {
        rdmaSocketWrite(b, off, len);
    }

    /**
     * Closes the stream.
     */
    private boolean closing = false;
    public void close() throws IOException {
        if (closing)
            return;
        closing = true;
        if (socket != null) {
            if (!socket.isClosed())
                socket.close();
        } else
            impl.close();
        closing = false;
    }

    /**
     * Perform class load-time initializations.
     */
    private static native void init();

}