# Class WsRemoteEndpointImplBase

java.lang.Object
org.apache.tomcat.websocket.WsRemoteEndpointImplBase

All Implemented Interfaces:
  `RemoteEndpoint`

Direct Known Subclasses:
  `WsRemoteEndpointImplClient, WsRemoteEndpointImplServer`

public abstract class WsRemoteEndpointImplBase extends Object implements RemoteEndpoint
Base implementation of a WebSocket remote endpoint.

- ## Nested Class Summary

  ### Nested classes/interfaces inherited from interface RemoteEndpoint

  `RemoteEndpoint.Async, RemoteEndpoint.Basic`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected final Semaphore`
  `messagePartInProgress`
  Semaphore to ensure only one message part is being processed at a time.
  `protected static final SendResult`
  `SENDRESULT_OK`
  `protected static final StringManager`
  `sm`
  String manager for this class.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `WsRemoteEndpointImplBase()`
  Default constructor.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `protected boolean`
  `acquireMessagePartInProgressSemaphore(byte opCode, long timeoutExpiry)`
  Acquire the semaphore that allows a message part to be written.
  `final void`
  `close()`
  Closes all encoders associated with this endpoint.
  `protected abstract void`
  `doClose()`
  Performs the actual close operation on the underlying connection.
  `protected abstract void`
  `doWrite(SendHandler handler, long blockingWriteTimeoutExpiry, ByteBuffer... data)`
  Writes data to the underlying connection.
  `void`
  `flushBatch()`
  Flush any currently batched messages to the remote endpoint.
  `boolean`
  `getBatchingAllowed()`
  Obtains the current batching status of the endpoint.
  `protected abstract Lock`
  `getLock()`
  Returns the lock used for thread-safe operations.
  `OutputStream`
  `getSendStream()`
  Returns an OutputStream for sending binary data.
  `long`
  `getSendTimeout()`
  Returns the send timeout in milliseconds.
  `Writer`
  `getSendWriter()`
  Returns a Writer for sending text data.
  `protected abstract boolean`
  `isMasked()`
  Checks if frames should be masked.
  `void`
  `sendBytes(ByteBuffer data)`
  Sends binary data to the remote endpoint.
  `void`
  `sendBytesByCompletion(ByteBuffer data, SendHandler handler)`
  Sends binary data asynchronously with a completion handler.
  `Future<Void>`
  `sendBytesByFuture(ByteBuffer data)`
  Sends binary data asynchronously, returning a Future for completion tracking.
  `void`
  `sendObject(Object obj)`
  Sends an object to the remote endpoint using the appropriate encoder.
  `void`
  `sendObjectByCompletion(Object obj, SendHandler completion)`
  Sends an object asynchronously with a completion handler.
  `Future<Void>`
  `sendObjectByFuture(Object obj)`
  Sends an object asynchronously, returning a Future for completion tracking.
  `void`
  `sendPartialBytes(ByteBuffer partialByte, boolean last)`
  Sends a partial binary message fragment.
  `void`
  `sendPartialString(String fragment, boolean isLast)`
  Sends a partial text message fragment.
  `void`
  `sendPing(ByteBuffer applicationData)`
  Send a ping message blocking until the message has been sent.
  `void`
  `sendPong(ByteBuffer applicationData)`
  Send a pong message blocking until the message has been sent.
  `void`
  `sendString(String text)`
  Sends a text message to the remote endpoint.
  `void`
  `sendStringByCompletion(String text, SendHandler handler)`
  Sends a text message asynchronously with a completion handler.
  `Future<Void>`
  `sendStringByFuture(String text)`
  Sends a text message asynchronously, returning a Future for completion tracking.
  `void`
  `setBatchingAllowed(boolean batchingAllowed)`
  Enable or disable the batching of outgoing messages for this endpoint.
  `protected void`
  `setEncoders(EndpointConfig endpointConfig)`
  Initializes the encoders for this endpoint from the given endpoint configuration.
  `void`
  `setSendTimeout(long timeout)`
  Sets the send timeout in milliseconds.
  `protected void`
  `setSession(WsSession wsSession)`
  Sets the WebSocket session for this endpoint.
  `protected void`
  `setTransformation(Transformation transformation)`
  Sets the transformation for this endpoint.
  `protected void`
  `updateStats(long payloadLength)`
  Hook for updating server side statistics.

  ### Methods inherited from class Object

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

- ## Field Details

  - ### sm

    protected static final StringManager sm
    String manager for this class.

  - ### SENDRESULT_OK

    protected static final SendResult SENDRESULT_OK

  - ### messagePartInProgress

    protected final Semaphore messagePartInProgress
    Semaphore to ensure only one message part is being processed at a time.

- ## Constructor Details

  - ### WsRemoteEndpointImplBase

    public WsRemoteEndpointImplBase()
    Default constructor.

- ## Method Details

  - ### setTransformation

    protected void setTransformation(Transformation transformation)
    Sets the transformation for this endpoint.
    Parameters:
      `transformation` - the transformation to use

  - ### getSendTimeout

    public long getSendTimeout()
    Returns the send timeout in milliseconds.
    Returns:
      the send timeout

  - ### setSendTimeout

    public void setSendTimeout(long timeout)
    Sets the send timeout in milliseconds.
    Parameters:
      `timeout` - the send timeout

  - ### setBatchingAllowed

    public void setBatchingAllowed(boolean batchingAllowed) throws IOException
    Description copied from interface: `javax.websocket.RemoteEndpoint`
    Enable or disable the batching of outgoing messages for this endpoint. If batching is disabled when it was previously enabled then this method will block until any currently batched messages have been written.
    Specified by:
      `setBatchingAllowed` in interface `RemoteEndpoint`
    Parameters:
      `batchingAllowed` - New setting
    Throws:
      `IOException` - If changing the value resulted in a call to `RemoteEndpoint.flushBatch()` and that call threw an `IOException`.

  - ### getBatchingAllowed

    public boolean getBatchingAllowed()
    Description copied from interface: `javax.websocket.RemoteEndpoint`
    Obtains the current batching status of the endpoint.
    Specified by:
      `getBatchingAllowed` in interface `RemoteEndpoint`
    Returns:
      `true` if batching is enabled, otherwise `false`.

  - ### flushBatch

    public void flushBatch() throws IOException
    Description copied from interface: `javax.websocket.RemoteEndpoint`
    Flush any currently batched messages to the remote endpoint. This method will block until the flush completes.
    Specified by:
      `flushBatch` in interface `RemoteEndpoint`
    Throws:
      `IOException` - If an I/O error occurs while flushing

  - ### sendBytes

    public void sendBytes(ByteBuffer data) throws IOException
    Sends binary data to the remote endpoint.
    Parameters:
      `data` - the binary data
    Throws:
      `IOException` - if a send error occurs

  - ### sendBytesByFuture

    public Future<Void> sendBytesByFuture(ByteBuffer data)
    Sends binary data asynchronously, returning a Future for completion tracking.
    Parameters:
      `data` - the binary data
    Returns:
      a Future that completes when the send is done

  - ### sendBytesByCompletion

    public void sendBytesByCompletion(ByteBuffer data, SendHandler handler)
    Sends binary data asynchronously with a completion handler.
    Parameters:
      `data` - the binary data
      `handler` - the completion handler

  - ### sendPartialBytes

    public void sendPartialBytes(ByteBuffer partialByte, boolean last) throws IOException
    Sends a partial binary message fragment.
    Parameters:
      `partialByte` - the binary data fragment
      `last` - whether this is the last fragment
    Throws:
      `IOException` - if a send error occurs

  - ### sendPing

    public void sendPing(ByteBuffer applicationData) throws IOException, IllegalArgumentException
    Description copied from interface: `javax.websocket.RemoteEndpoint`
    Send a ping message blocking until the message has been sent. Note that if a message is in the process of being sent asynchronously, this method will block until that message and this ping has been sent.
    Specified by:
      `sendPing` in interface `RemoteEndpoint`
    Parameters:
      `applicationData` - The payload for the ping message
    Throws:
      `IOException` - If an I/O error occurs while sending the ping
      `IllegalArgumentException` - if the applicationData is too large for a control message (max 125 bytes)

  - ### sendPong

    public void sendPong(ByteBuffer applicationData) throws IOException, IllegalArgumentException
    Description copied from interface: `javax.websocket.RemoteEndpoint`
    Send a pong message blocking until the message has been sent. Note that if a message is in the process of being sent asynchronously, this method will block until that message and this pong has been sent.
    Specified by:
      `sendPong` in interface `RemoteEndpoint`
    Parameters:
      `applicationData` - The payload for the pong message
    Throws:
      `IOException` - If an I/O error occurs while sending the pong
      `IllegalArgumentException` - if the applicationData is too large for a control message (max 125 bytes)

  - ### sendString

    public void sendString(String text) throws IOException
    Sends a text message to the remote endpoint.
    Parameters:
      `text` - the text data
    Throws:
      `IOException` - if a send error occurs

  - ### sendStringByFuture

    public Future<Void> sendStringByFuture(String text)
    Sends a text message asynchronously, returning a Future for completion tracking.
    Parameters:
      `text` - the text data
    Returns:
      a Future that completes when the send is done

  - ### sendStringByCompletion

    public void sendStringByCompletion(String text, SendHandler handler)
    Sends a text message asynchronously with a completion handler.
    Parameters:
      `text` - the text data
      `handler` - the completion handler

  - ### sendPartialString

    public void sendPartialString(String fragment, boolean isLast) throws IOException
    Sends a partial text message fragment.
    Parameters:
      `fragment` - the text fragment
      `isLast` - whether this is the last fragment
    Throws:
      `IOException` - if a send error occurs

  - ### getSendStream

    public OutputStream getSendStream()
    Returns an OutputStream for sending binary data.
    Returns:
      the output stream

  - ### getSendWriter

    public Writer getSendWriter()
    Returns a Writer for sending text data.
    Returns:
      the writer

  - ### acquireMessagePartInProgressSemaphore

    protected boolean acquireMessagePartInProgressSemaphore(byte opCode, long timeoutExpiry) throws InterruptedException
    Acquire the semaphore that allows a message part to be written.
    Parameters:
      `opCode` - The OPCODE for the message to be written
      `timeoutExpiry` - The time when the attempt to acquire the semaphore should expire
    Returns:
      `true` if the semaphore is obtained, otherwise `false`.
    Throws:
      `InterruptedException` - If the wait for the semaphore is interrupted

  - ### updateStats

    protected void updateStats(long payloadLength)
    Hook for updating server side statistics. Called on every frame written (including when batching is enabled and the frames are buffered locally until the buffer is full or is flushed).
    Parameters:
      `payloadLength` - Size of message payload

  - ### sendObject

    public void sendObject(Object obj) throws IOException, EncodeException
    Sends an object to the remote endpoint using the appropriate encoder.
    Parameters:
      `obj` - the object to send
    Throws:
      `IOException` - if a send error occurs
      `EncodeException` - if encoding fails

  - ### sendObjectByFuture

    public Future<Void> sendObjectByFuture(Object obj)
    Sends an object asynchronously, returning a Future for completion tracking.
    Parameters:
      `obj` - the object to send
    Returns:
      a Future that completes when the send is done

  - ### sendObjectByCompletion

    public void sendObjectByCompletion(Object obj, SendHandler completion)
    Sends an object asynchronously with a completion handler.
    Parameters:
      `obj` - the object to send
      `completion` - the completion handler

  - ### setSession

    protected void setSession(WsSession wsSession)
    Sets the WebSocket session for this endpoint.
    Parameters:
      `wsSession` - the session

  - ### setEncoders

    protected void setEncoders(EndpointConfig endpointConfig) throws DeploymentException
    Initializes the encoders for this endpoint from the given endpoint configuration.
    Parameters:
      `endpointConfig` - the endpoint configuration
    Throws:
      `DeploymentException` - if an encoder cannot be initialized

  - ### close

    public final void close()
    Closes all encoders associated with this endpoint.

  - ### doWrite

    protected abstract void doWrite(SendHandler handler, long blockingWriteTimeoutExpiry, ByteBuffer... data)
    Writes data to the underlying connection.
    Parameters:
      `handler` - the send handler
      `blockingWriteTimeoutExpiry` - the timeout expiry time
      `data` - the data buffers to write

  - ### isMasked

    protected abstract boolean isMasked()
    Checks if frames should be masked.
    Returns:
      true if masking is required

  - ### doClose

    protected abstract void doClose()
    Performs the actual close operation on the underlying connection.

  - ### getLock

    protected abstract Lock getLock()
    Returns the lock used for thread-safe operations.
    Returns:
      the reentrant lock