[jira] [Commented] (OPENMEETINGS-662) Code contribution - mathematical whiteboard

["Andrey Bogdanov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OPENMEETINGS-662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677860#comment-13677860 ] 

Andrey Bogdanov commented on OPENMEETINGS-662:
----------------------------------------------

Some comments about using this code.

1. Add js, css and image files from bin folder to you project.
2. Add html-element which will contain whiteboard
3. Create whiteboard with using call bay.whiteboard.Create()
4. Render created whiteboard to the html-element using whiteboard.render
5. Example is in given html-file

To use synchronisation create websocket chat-server. Below is a sample code based on org.apache.catalina.websocket.WebSocketServlet
Link websocket address to whiteboard: whiteboard.linkWebSocket('ws://host:port/path');

Sample websocket server:

public class WhiteboardWebSocketServlet extends WebSocketServlet {
    private static final long serialVersionUID = 2L;
    // Set of connected clients
    private final Set<WBMessageInbound> connections = new CopyOnWriteArraySet<WBMessageInbound>();
    @Override
    protected StreamInbound createWebSocketInbound(String subProtocol, HttpServletRequest request) {
        return new WBMessageInbound();
    }
    private final class WBMessageInbound extends MessageInbound {
        @Override
        protected void onOpen(WsOutbound outbound) {
            connections.add(this);
        }
        @Override
        protected void onClose(int status) {
            connections.remove(this);
        }
        @Override
        protected void onBinaryMessage(ByteBuffer message) throws IOException {
            throw new UnsupportedOperationException("Binary message not supported.");
        }
        @Override
        protected void onTextMessage(CharBuffer message) throws IOException {
            // translate the message to all other clients
            for (WBMessageInbound connection : connections) {
                try {
                	if (connection != this)
                		connection.getWsOutbound().writeTextMessage(message);
                } catch (IOException ignore) {
                }
            }
        }
    }
}

                
> Code contribution - mathematical whiteboard
> -------------------------------------------
>
>                 Key: OPENMEETINGS-662
>                 URL: https://issues.apache.org/jira/browse/OPENMEETINGS-662
>             Project: Openmeetings
>          Issue Type: Improvement
>          Components: HTML5
>            Reporter: Andrey Bogdanov
>            Priority: Minor
>         Attachments: bin.zip, src.zip
>
>
> Source code for mathematical whiteboard is attached. It can be used as alternate whiteboard for openmeetings

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