Package io.vertx.core.http

## Interface WebSocket

- All Superinterfaces:
    `ReadStream<Buffer>`, `StreamBase`, `WebSocketBase`, `WriteStream<Buffer>`
  All Known Subinterfaces:
    `ClientWebSocket`, `ServerWebSocket`

      public interface WebSocket
      extends WebSocketBase

  Common WebSocket implementation.

  It implements both `ReadStream` and `WriteStream` so it can be used with `Pipe` to pipe data with flow control.

  Author:
    Tim Fox

- - ### Method Summary

    All Methods Instance Methods Abstract Methods Default Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `WebSocket` | `binaryMessageHandler​(Handler<Buffer> handler)` | Set a binary message handler on the connection.
    `WebSocket` | `closeHandler​(Handler<Void> handler)` | Set a close handler.
    `WebSocket` | `drainHandler​(Handler<Void> handler)` | Set a drain handler on the stream.
    `WebSocket` | `endHandler​(Handler<Void> endHandler)` | Set an end handler.
    `WebSocket` | `exceptionHandler​(Handler<Throwable> handler)` | Set an exception handler on the read stream.
    `WebSocket` | `fetch​(long amount)` | Fetch the specified `amount` of elements.
    `WebSocket` | `frameHandler​(Handler<WebSocketFrame> handler)` | Set a frame handler on the connection.
    `WebSocket` | `handler​(Handler<Buffer> handler)` | Set a data handler.
    `WebSocket` | `pause()` | Pause the `ReadStream`, it sets the buffer in `fetch` mode and clears the actual demand.
    `WebSocket` | `pongHandler​(Handler<Buffer> handler)` | Set a pong frame handler on the connection.
    `default WebSocket` | `resume()` | Resume reading, and sets the buffer in `flowing` mode.
    `WebSocket` | `setWriteQueueMaxSize​(int maxSize)` | Set the maximum size of the write queue to `maxSize`.
    `WebSocket` | `shutdownHandler​(Handler<Void> handler)` | Set a `handler` notified when the WebSocket is shutdown: the client or server will close the connection within a certain amount of time.
    `WebSocket` | `textMessageHandler​(Handler<String> handler)` | Set a text message handler on the connection.

    - ### Methods inherited from interface io.vertx.core.streams.ReadStream

      `collect, pipe, pipeTo`

    - ### Methods inherited from interface io.vertx.core.http.WebSocketBase

      `binaryHandlerID, close, close, close, closeReason, closeStatusCode, end, headers, isClosed, isSsl, localAddress, peerCertificates, remoteAddress, shutdown, shutdown, shutdown, shutdown, shutdown, shutdown, sslSession, subProtocol, textHandlerID, writeBinaryMessage, writeFinalBinaryFrame, writeFinalTextFrame, writeFrame, writePing, writePong, writeTextMessage`

    - ### Methods inherited from interface io.vertx.core.streams.WriteStream

      `end, write, writeQueueFull`

- - ### Method Detail

    - #### exceptionHandler

          WebSocket exceptionHandler​(Handler<Throwable> handler)

      Description copied from interface: `ReadStream`
      Set an exception handler on the read stream.
      Specified by:
        `exceptionHandler` in interface `ReadStream<Buffer>`
      Specified by:
        `exceptionHandler` in interface `StreamBase`
      Specified by:
        `exceptionHandler` in interface `WebSocketBase`
      Specified by:
        `exceptionHandler` in interface `WriteStream<Buffer>`
      Parameters:
        `handler` - the exception handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### handler

          WebSocket handler​(Handler<Buffer> handler)

      Description copied from interface: `ReadStream`
      Set a data handler. As data is read, the handler will be called with the data.
      Specified by:
        `handler` in interface `ReadStream<Buffer>`
      Specified by:
        `handler` in interface `WebSocketBase`
      Returns:
        a reference to this, so the API can be used fluently

    - #### pause

          WebSocket pause()

      Description copied from interface: `ReadStream`
      Pause the `ReadStream`, it sets the buffer in `fetch` mode and clears the actual demand.

      While it's paused, no data will be sent to the data `handler`.

      Specified by:
        `pause` in interface `ReadStream<Buffer>`
      Specified by:
        `pause` in interface `WebSocketBase`
      Returns:
        a reference to this, so the API can be used fluently

    - #### resume

          default WebSocket resume()

      Description copied from interface: `ReadStream`
      Resume reading, and sets the buffer in `flowing` mode.

      If the `ReadStream` has been paused, reading will recommence on it.
      Specified by:
        `resume` in interface `ReadStream<Buffer>`
      Specified by:
        `resume` in interface `WebSocketBase`
      Returns:
        a reference to this, so the API can be used fluently

    - #### fetch

          WebSocket fetch​(long amount)

      Description copied from interface: `ReadStream`
      Fetch the specified `amount` of elements. If the `ReadStream` has been paused, reading will recommence with the specified `amount` of items, otherwise the specified `amount` will be added to the current stream demand.
      Specified by:
        `fetch` in interface `ReadStream<Buffer>`
      Specified by:
        `fetch` in interface `WebSocketBase`
      Returns:
        a reference to this, so the API can be used fluently

    - #### endHandler

          WebSocket endHandler​(Handler<Void> endHandler)

      Description copied from interface: `ReadStream`
      Set an end handler. Once the stream has ended, and there is no more data to be read, this handler will be called.
      Specified by:
        `endHandler` in interface `ReadStream<Buffer>`
      Specified by:
        `endHandler` in interface `WebSocketBase`
      Returns:
        a reference to this, so the API can be used fluently

    - #### setWriteQueueMaxSize

          WebSocket setWriteQueueMaxSize​(int maxSize)

      Description copied from interface: `WriteStream`
      Set the maximum size of the write queue to `maxSize`. You will still be able to write to the stream even if there is more than `maxSize` items in the write queue. This is used as an indicator by classes such as `Pipe` to provide flow control.

      The value is defined by the implementation of the stream, e.g in bytes for a `NetSocket`, etc...
      Specified by:
        `setWriteQueueMaxSize` in interface `WebSocketBase`
      Specified by:
        `setWriteQueueMaxSize` in interface `WriteStream<Buffer>`
      Parameters:
        `maxSize` - the max size of the write stream
      Returns:
        a reference to this, so the API can be used fluently

    - #### drainHandler

          WebSocket drainHandler​(Handler<Void> handler)

      Description copied from interface: `WriteStream`
      Set a drain handler on the stream. If the write queue is full, then the handler will be called when the write queue is ready to accept buffers again. See `Pipe` for an example of this being used.

      The stream implementation defines when the drain handler, for example it could be when the queue size has been reduced to `maxSize / 2`.

      Specified by:
        `drainHandler` in interface `WebSocketBase`
      Specified by:
        `drainHandler` in interface `WriteStream<Buffer>`
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### closeHandler

          WebSocket closeHandler​(Handler<Void> handler)

      Description copied from interface: `WebSocketBase`
      Set a close handler. This will be called when the WebSocket is closed.

      After this callback, no more messages are expected. When the WebSocket received a close frame, the `WebSocketBase.closeStatusCode()` will return the status code and `WebSocketBase.closeReason()` will return the reason.
      Specified by:
        `closeHandler` in interface `WebSocketBase`
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### shutdownHandler

          WebSocket shutdownHandler​(Handler<Void> handler)

      Description copied from interface: `WebSocketBase`
      Set a `handler` notified when the WebSocket is shutdown: the client or server will close the connection within a certain amount of time. This gives the opportunity to the `handler` to close the WebSocket gracefully before the WebSocket is forcefully closed.
      Specified by:
        `shutdownHandler` in interface `WebSocketBase`
      Parameters:
        `handler` - the handler notified with the remaining shutdown
      Returns:
        a reference to this, so the API can be used fluently

    - #### frameHandler

          WebSocket frameHandler​(Handler<WebSocketFrame> handler)

      Description copied from interface: `WebSocketBase`
      Set a frame handler on the connection. This handler will be called when frames are read on the connection.
      Specified by:
        `frameHandler` in interface `WebSocketBase`
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### textMessageHandler

          WebSocket textMessageHandler​(Handler<String> handler)

      Description copied from interface: `WebSocketBase`
      Set a text message handler on the connection. This handler will be called similar to the `WebSocketBase.binaryMessageHandler(Handler)`, but the buffer will be converted to a String first
      Specified by:
        `textMessageHandler` in interface `WebSocketBase`
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### binaryMessageHandler

          WebSocket binaryMessageHandler​(Handler<Buffer> handler)

      Description copied from interface: `WebSocketBase`
      Set a binary message handler on the connection. This handler serves a similar purpose to `WebSocketBase.handler(Handler)` except that if a message comes into the socket in multiple frames, the data from the frames will be aggregated into a single buffer before calling the handler (using `WebSocketFrame.isFinal()` to find the boundaries).
      Specified by:
        `binaryMessageHandler` in interface `WebSocketBase`
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### pongHandler

          WebSocket pongHandler​(Handler<Buffer> handler)

      Description copied from interface: `WebSocketBase`
      Set a pong frame handler on the connection. This handler will be invoked every time a pong frame is received on the server, and can be used by both clients and servers since the RFC 6455 section 5.5.2 and section 5.5.3 do not specify whether the client or server sends a ping.

      Pong frames may be at most 125 bytes (octets).

      There is no ping handler since ping frames should immediately be responded to with a pong frame with identical content

      Pong frames may be received unsolicited.

      Specified by:
        `pongHandler` in interface `WebSocketBase`
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently