io.vertx.core.http

## Interface WebSocketBase

- All Superinterfaces:
    ReadStream<Buffer>, StreamBase, WriteStream<Buffer>
  All Known Subinterfaces:
    ServerWebSocket, WebSocket

      public interface WebSocketBase
      extends ReadStream<Buffer>, WriteStream<Buffer>

  Base WebSocket implementation.

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

  Author:
    Tim Fox

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `binaryHandlerID()` When a `Websocket` is created it automatically registers an event handler with the event bus - the ID of that handler is given by this method.
    `WebSocketBase` | `binaryMessageHandler(Handler<Buffer> handler)` Set a binary message handler on the connection.
    `void` | `close()` Close the WebSocket sending the default close frame.
    `void` | `close(short statusCode)`
    `void` | `close(short statusCode, String reason)`
    `WebSocketBase` | `closeHandler(Handler<Void> handler)` Set a close handler.
    `WebSocketBase` | `drainHandler(Handler<Void> handler)` Set a drain handler on the stream.
    `void` | `end()` Calls `close()`
    `WebSocketBase` | `endHandler(Handler<Void> endHandler)` Set an end handler.
    `WebSocketBase` | `exceptionHandler(Handler<Throwable> handler)` Set an exception handler on the read stream.
    `WebSocketBase` | `fetch(long amount)` Fetch the specified `amount` of elements.
    `WebSocketBase` | `frameHandler(Handler<WebSocketFrame> handler)` Set a frame handler on the connection.
    `WebSocketBase` | `handler(Handler<Buffer> handler)` Set a data handler.
    `boolean` | `isSsl()`
    `SocketAddress` | `localAddress()`
    `WebSocketBase` | `pause()` Pause the `ReadStream`, it sets the buffer in `fetch` mode and clears the actual demand.
    `X509Certificate[]` | `peerCertificateChain()` Note: Java SE 5+ recommends to use javax.net.ssl.SSLSession#getPeerCertificates() instead of of javax.net.ssl.SSLSession#getPeerCertificateChain() which this method is based on.
    `WebSocketBase` | `pongHandler(Handler<Buffer> handler)` Set a pong message handler on the connection.
    `SocketAddress` | `remoteAddress()`
    `WebSocketBase` | `resume()` Resume reading, and sets the buffer in `flowing` mode.
    `WebSocketBase` | `setWriteQueueMaxSize(int maxSize)` Set the maximum size of the write queue to `maxSize`.
    `SSLSession` | `sslSession()`
    `String` | `subProtocol()` Returns the websocket sub protocol selected by the websocket handshake.
    `String` | `textHandlerID()` When a `Websocket` is created it automatically registers an event handler with the eventbus, the ID of that handler is given by `textHandlerID`.
    `WebSocketBase` | `textMessageHandler(Handler<String> handler)` Set a text message handler on the connection.
    `WebSocketBase` | `write(Buffer data)` Write some data to the stream.
    `WebSocketBase` | `writeBinaryMessage(Buffer data)` Writes a (potentially large) piece of binary data to the connection.
    `WebSocketBase` | `writeFinalBinaryFrame(Buffer data)` Write a final WebSocket binary frame to the connection
    `WebSocketBase` | `writeFinalTextFrame(String text)` Write a final WebSocket text frame to the connection
    `WebSocketBase` | `writeFrame(WebSocketFrame frame)` Write a WebSocket frame to the connection
    `WebSocketBase` | `writePing(Buffer data)` Writes a ping to the connection.
    `WebSocketBase` | `writePong(Buffer data)` Writes a pong to the connection.
    `WebSocketBase` | `writeTextMessage(String text)` Writes a (potentially large) piece of text data to the connection.

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

      `end, writeQueueFull`

- - ### Method Detail

    - #### exceptionHandler

          WebSocketBase 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 `WriteStream<Buffer>`
      Parameters:
        `handler` - the exception handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### handler

          WebSocketBase 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>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### pause

          WebSocketBase 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>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### resume

          WebSocketBase 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>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### fetch

          WebSocketBase 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>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### endHandler

          WebSocketBase 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>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### write

          WebSocketBase write(Buffer data)

      Description copied from interface: `WriteStream`
      Write some data to the stream. The data is put on an internal write queue, and the write actually happens asynchronously. To avoid running out of memory by putting too much on the write queue, check the `WriteStream.writeQueueFull()` method before writing. This is done automatically if using a `Pump`.
      Specified by:
        `write` in interface `WriteStream<Buffer>`
      Parameters:
        `data` - the data to write
      Returns:
        a reference to this, so the API can be used fluently

    - #### setWriteQueueMaxSize

          WebSocketBase 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 `Pump` to provide flow control.

      The value is defined by the implementation of the stream, e.g in bytes for a `NetSocket`, the number of `Message` for a `MessageProducer`, etc...
      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

          WebSocketBase 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 `Pump` 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 `WriteStream<Buffer>`
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### binaryHandlerID

          String binaryHandlerID()

      When a `Websocket` is created it automatically registers an event handler with the event bus - the ID of that handler is given by this method.

      Given this ID, a different event loop can send a binary frame to that event handler using the event bus and that buffer will be received by this instance in its own event loop and written to the underlying connection. This allows you to write data to other WebSockets which are owned by different event loops.

      Returns:
        the binary handler id

    - #### textHandlerID

          String textHandlerID()

      When a `Websocket` is created it automatically registers an event handler with the eventbus, the ID of that handler is given by `textHandlerID`.

      Given this ID, a different event loop can send a text frame to that event handler using the event bus and that buffer will be received by this instance in its own event loop and written to the underlying connection. This allows you to write data to other WebSockets which are owned by different event loops.

    - #### subProtocol

          String subProtocol()

      Returns the websocket sub protocol selected by the websocket handshake.

      On the server, the value will be `null` when the handler receives the websocket callback as the handshake will not be completed yet.

    - #### writeFrame

          WebSocketBase writeFrame(WebSocketFrame frame)

      Write a WebSocket frame to the connection
      Parameters:
        `frame` - the frame to write
      Returns:
        a reference to this, so the API can be used fluently

    - #### writeFinalTextFrame

          WebSocketBase writeFinalTextFrame(String text)

      Write a final WebSocket text frame to the connection
      Parameters:
        `text` - The text to write
      Returns:
        a reference to this, so the API can be used fluently

    - #### writeFinalBinaryFrame

          WebSocketBase writeFinalBinaryFrame(Buffer data)

      Write a final WebSocket binary frame to the connection
      Parameters:
        `data` - The data to write
      Returns:
        a reference to this, so the API can be used fluently

    - #### writeBinaryMessage

          WebSocketBase writeBinaryMessage(Buffer data)

      Writes a (potentially large) piece of binary data to the connection. This data might be written as multiple frames if it exceeds the maximum WebSocket frame size.
      Parameters:
        `data` - the data to write
      Returns:
        a reference to this, so the API can be used fluently

    - #### writeTextMessage

          WebSocketBase writeTextMessage(String text)

      Writes a (potentially large) piece of text data to the connection. This data might be written as multiple frames if it exceeds the maximum WebSocket frame size.
      Parameters:
        `text` - the data to write
      Returns:
        a reference to this, so the API can be used fluently

    - #### writePing

          WebSocketBase writePing(Buffer data)

      Writes a ping to the connection. This will be written in a single frame. Ping frames may be at most 125 bytes (octets).

      This method should not be used to write application data and should only be used for implementing a keep alive or to ensure the client is still responsive, see RFC 6455 Section 5.5.2.

      There is no pingHandler because RFC 6455 section 5.5.2 clearly states that the only response to a ping is a pong with identical contents.

      Parameters:
        `data` - the data to write, may be at most 125 bytes
      Returns:
        a reference to this, so the API can be used fluently

    - #### writePong

          WebSocketBase writePong(Buffer data)

      Writes a pong to the connection. This will be written in a single frame. Pong frames may be at most 125 bytes (octets).

      This method should not be used to write application data and should only be used for implementing a keep alive or to ensure the client is still responsive, see RFC 6455 Section 5.5.2.

      There is no need to manually write a Pong, as the server and client both handle responding to a ping with a pong automatically and this is exposed to users.RFC 6455 Section 5.5.3 states that pongs may be sent unsolicited in order to implement a one way heartbeat.

      Parameters:
        `data` - the data to write, may be at most 125 bytes
      Returns:
        a reference to this, so the API can be used fluently

    - #### closeHandler

          WebSocketBase closeHandler(Handler<Void> handler)

      Set a close handler. This will be called when the WebSocket is closed.

      After this callback, no more messages are expected.
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### frameHandler

          WebSocketBase frameHandler(Handler<WebSocketFrame> handler)

      Set a frame handler on the connection. This handler will be called when frames are read on the connection.
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### textMessageHandler

          WebSocketBase textMessageHandler(Handler<String> handler)

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

    - #### binaryMessageHandler

          WebSocketBase binaryMessageHandler(Handler<Buffer> handler)

      Set a binary message handler on the connection. This handler serves a similar purpose to `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).
      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### pongHandler

          WebSocketBase pongHandler(Handler<Buffer> handler)

      Set a pong message handler on the connection. This handler will be invoked every time a pong message is received on the server, and can be used by both clients and servers since the RFC 6455 Sections 5.5.2 and 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 pings should immediately be responded to with a pong with identical content

      Pong frames may be received unsolicited.

      Parameters:
        `handler` - the handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### end

          void end()

      Calls `close()`
      Specified by:
        `end` in interface `WriteStream<Buffer>`

    - #### close

          void close()

      Close the WebSocket sending the default close frame.

      No more messages can be sent.

    - #### close

          void close(short statusCode)

    - #### close

          void close(short statusCode,
                     String reason)

    - #### remoteAddress

          SocketAddress remoteAddress()

      Returns:
        the remote address for this socket

    - #### localAddress

          SocketAddress localAddress()

      Returns:
        the local address for this socket

    - #### isSsl

          boolean isSsl()

      Returns:
        true if this `HttpConnection` is encrypted via SSL/TLS.

    - #### sslSession

          SSLSession sslSession()

      Returns:
        SSLSession associated with the underlying socket. Returns null if connection is not SSL.
      See Also:
        `SSLSession`

    - #### peerCertificateChain

          X509Certificate[] peerCertificateChain()
                                          throws SSLPeerUnverifiedException

      Note: Java SE 5+ recommends to use javax.net.ssl.SSLSession#getPeerCertificates() instead of of javax.net.ssl.SSLSession#getPeerCertificateChain() which this method is based on. Use `sslSession()` to access that method.
      Returns:
        an ordered array of the peer certificates. Returns null if connection is not SSL.
      Throws:
        `SSLPeerUnverifiedException` - SSL peer's identity has not been verified.
      See Also:
        `SSLSession.getPeerCertificateChain()`, `sslSession()`

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