org.apache.tomcat.websocket

## Class WsFrameBase

- java.lang.Object
- - org.apache.tomcat.websocket.WsFrameBase

- Direct Known Subclasses:
    WsFrameClient, WsFrameServer

      public abstract class WsFrameBase
      extends Object

  Takes the ServletInputStream, processes the WebSocket frames it contains and extracts the messages. WebSocket Pings received will be responded to automatically without any action required by the application.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---

    `protected static class`

    `WsFrameBase.ReadState`
    WAITING - not suspended Server case: waiting for a notification that data is ready to be read from the socket, the socket is registered to the poller Client case: data has been read from the socket and is waiting for data to be processed PROCESSING - not suspended Server case: reading from the socket and processing the data Client case: processing the data if such has already been read and more data will be read from the socket SUSPENDING_WAIT - suspended, a call to suspend() was made while in WAITING state.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected ByteBuffer` | `inputBuffer`
    `protected WsSession` | `wsSession`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `WsFrameBase(WsSession wsSession, Transformation transformation)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected static long` | `byteArrayToLong(byte[] b, int start, int len)`
    `protected void` | `changeReadState(WsFrameBase.ReadState newState)`
    `protected boolean` | `changeReadState(WsFrameBase.ReadState oldState, WsFrameBase.ReadState newState)`
    `protected abstract Log` | `getLog()`
    `protected WsFrameBase.ReadState` | `getReadState()`
    `protected Transformation` | `getTransformation()`
    `protected abstract boolean` | `isMasked()`
    `protected boolean` | `isOpen()`
    `protected boolean` | `isSuspended()`
    `protected void` | `processInputBuffer()`
    `void` | `resume()`
    `protected abstract void` | `resumeProcessing()` This method will be invoked when the read operation is resumed.
    `protected void` | `sendMessageBinary(ByteBuffer msg, boolean last)`
    `protected void` | `sendMessageText(boolean last)`
    `void` | `suspend()`
    `protected void` | `updateStats(long payloadLength)` Hook for updating server side statistics.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### wsSession

          protected final WsSession wsSession

    - #### inputBuffer

          protected final ByteBuffer inputBuffer

  - ### Constructor Detail

    - #### WsFrameBase

          public WsFrameBase(WsSession wsSession,
                     Transformation transformation)

  - ### Method Detail

    - #### processInputBuffer

          protected void processInputBuffer()
                                     throws IOException

      Throws:
        `IOException`

    - #### isMasked

          protected abstract boolean isMasked()

    - #### getLog

          protected abstract Log getLog()

    - #### updateStats

          protected void updateStats(long payloadLength)

      Hook for updating server side statistics. Called on every frame received.
      Parameters:
        `payloadLength` - Size of message payload

    - #### sendMessageText

          protected void sendMessageText(boolean last)
                                  throws WsIOException

      Throws:
        `WsIOException`

    - #### sendMessageBinary

          protected void sendMessageBinary(ByteBuffer msg,
                               boolean last)
                                    throws WsIOException

      Throws:
        `WsIOException`

    - #### byteArrayToLong

          protected static long byteArrayToLong(byte[] b,
                             int start,
                             int len)
                                         throws IOException

      Throws:
        `IOException`

    - #### isOpen

          protected boolean isOpen()

    - #### getTransformation

          protected Transformation getTransformation()

    - #### suspend

          public void suspend()

    - #### resume

          public void resume()

    - #### isSuspended

          protected boolean isSuspended()

    - #### getReadState

          protected WsFrameBase.ReadState getReadState()

    - #### changeReadState

          protected void changeReadState(WsFrameBase.ReadState newState)

    - #### changeReadState

          protected boolean changeReadState(WsFrameBase.ReadState oldState,
                                WsFrameBase.ReadState newState)

    - #### resumeProcessing

          protected abstract void resumeProcessing()

      This method will be invoked when the read operation is resumed. As the suspend of the read operation can be invoked at any time, when implementing this method one should consider that there might still be data remaining into the internal buffers that needs to be processed before reading again from the socket.

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