jetty-websocket/websocket-api/src/main/java/org/eclipse/jetty/websocket/api/WebSocketPartialListener.java

//
//  ========================================================================
//  Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.websocket.api;

import java.nio.ByteBuffer;

/**
 * WebSocket Partial Message Listener interface for incoming WebSocket TEXT/BINARY/CONTINUATION frames.
 */
public interface WebSocketPartialListener extends WebSocketConnectionListener
{
    /**
     * A WebSocket BINARY (or associated CONTINUATION) frame has been received.
     * <p>
     * <b>Important Note</b>: The payload <code>ByteBuffer</code> cannot be modified, and the ByteBuffer object itself
     * will be recycled on completion of this method call, make a copy of the data contained within if you want to
     * retain it between calls.
     * 
     * @param payload
     *            the binary message frame payload
     * @param fin
     *            true if this is the final frame, false otherwise
     */
    void onWebSocketPartialBinary(ByteBuffer payload, boolean fin);

    /**
     * A WebSocket TEXT (or associated CONTINUATION) frame has been received.
     * 
     * @param payload
     *            the text message payload
     *            <p>
     *            Note that due to framing, there is a above average chance of any UTF8 sequences being split on the
     *            border between two frames will result in either the previous frame, or the next frame having an
     *            invalid UTF8 sequence, but the combined frames having a valid UTF8 sequence.
     *            <p>
     *            The String being provided here will not end in a split UTF8 sequence. Instead this partial sequence
     *            will be held over until the next frame is received.
     * @param fin
     *            true if this is the final frame, false otherwise
     */
    void onWebSocketPartialText(String payload, boolean fin);
}