Package com.openinventor.remoteviz.rendering

Class Connection

  • public class Connection
extends Inventor
    Represents a connection from a Client to a RenderArea managed by the RemoteViz service. A Connection object is created automatically by RemoteViz when a client connects to the service. Each connection belongs to a single Client and a single RenderArea. Each Client may have multiple connections, for example when multiple render areas are created on the same browser page. Each RenderArea may have multiple connections if it is shared, i.e. displayed in multiple client render areas. Use the Service object to query a client, then use the Client object to query its connections.

    A Connection object is passed to many of the RenderAreaListener methods including onOpenedConnection(), onInitializedConnection() and onSendingFrame().

    Using a Connection object, the application can query the current width and height of the client "container" in pixels and the last RenderArea width and height requested by the client. Note that the render area and the container are not required to be the same size. If the aspect ratios are different, then the rendered image will be displayed inside the container according to the "displayMode" specified when the client called the RemoteVizRenderArea constructor or set the 'displayMode' field of the SoRemoteVizClient node. Possible values are FIT (default), CROP and STRETCH.

    A Connection allows the application to send text or binary messages to the associated client. A JavaScript client will receive the message using a listener (see the RemoteVizRenderArea method addServiceListener). Messages from a client are received using one of the RenderAreaListener.onReceivedMessage() methods.

    • Method Detail

      • getSettings

        public ConnectionSettings getSettings()
        Gets the connection settings.

        Returns:
        the connection settings object

      • getParameters

        public ConnectionParameters getParameters()
        Gets the connection parameters. These are field-value pairs included in the url during the client connection. See RemoteVizRenderArea.connectTo().

        Returns:
        the connection parameters object

      • getLastEncodedFrame

        public EncodedFrame getLastEncodedFrame()
        Gets the last encoded frame sent by the connection.

        Returns:
        encoded frame.

      • isOpen

        public boolean isOpen()
        Gets the state of the Connection: open or closed. RemoteViz does not keep a reference to the Connection object after the connection is closed. If the application kept a reference to the object, this method can be used to query its state. If the application did not keep a reference, then the Connection object will be disposed after the connection is closed.

        The state "closed" will be set just before triggering the listener RenderAreaListener.onClosedConnection.

        Returns:
        true if the connection is open or false if the connection is closed.

      • getContainerHeight

        public int getContainerHeight()
        Gets the client container height.

        Returns:
        the client container height

      • getId

        public java.lang.String getId()
        Gets the id of the connection. The id is a Globally Unique Identifier (GUID) created by RemoteViz.

        Returns:
        the ID identifying the connection

      • getRenderArea

        public RenderArea getRenderArea()
        Gets the RenderArea associated with the connection.

        Returns:
        the renderArea object

      • sendMessage

        public boolean sendMessage​(java.lang.String message)
        Sends a text message to the client. The client-side message event will be triggered.

        Parameters:
        message - : the message to be sent to the client

        Returns:
        true if the message has been successfully sent, otherwise returns false.

      • getContainerWidth

        public int getContainerWidth()
        Gets the client container width.

        Returns:
        the client container width

      • getClient

        public Client getClient()
        Gets the client associated with this connection.

        Returns:
        the ID identifying the client

      • getRequestedHeight

        public int getRequestedHeight()
        Gets the last renderArea height requested by the client.

        Returns:
        the requested renderArea height

      • close

        public void close()
        Closes the connection. A KICKED disconnect message will be sent to the client.

      • getRequestedWidth

        public int getRequestedWidth()
        Gets the last renderArea width requested by the client.

        Returns:
        the requested renderArea width

      • sendMessage

        public boolean sendMessage​(java.util.Collection<java.lang.Byte> buffer)
        Sends a binary message to the client. The client-side message event will be triggered.

        Parameters:
        buffer - : the binary message to be sent to the client

        Returns:
        true if the message has been successfully sent, otherwise returns false.