# Class Nio2Endpoint.Nio2SocketWrapper

java.lang.Object
org.apache.tomcat.util.net.SocketWrapperBase<Nio2Channel>
org.apache.tomcat.util.net.Nio2Endpoint.Nio2SocketWrapper

Enclosing class:
  `Nio2Endpoint`

public static class Nio2Endpoint.Nio2SocketWrapper extends SocketWrapperBase<Nio2Channel>

- ## Nested Class Summary

  ### Nested classes/interfaces inherited from class SocketWrapperBase

  `SocketWrapperBase.BlockingMode, SocketWrapperBase.CompletionCheck, SocketWrapperBase.CompletionHandlerCall, SocketWrapperBase.CompletionState, SocketWrapperBase.OperationState<A>, SocketWrapperBase.VectoredIOCompletionHandler<A>`

- ## Field Summary

  ### Fields inherited from class SocketWrapperBase

  `bufferedWriteSize, closed, COMPLETE_READ, COMPLETE_READ_WITH_COMPLETION, COMPLETE_WRITE, COMPLETE_WRITE_WITH_COMPLETION, localAddr, localName, localPort, nonBlockingWriteBuffer, previousIOException, READ_DATA, readOperation, readPending, remoteAddr, remoteHost, remotePort, servletConnection, sm, sniHostName, socketBufferHandler, writeOperation, writePending`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `Nio2SocketWrapper(Nio2Channel channel, Nio2Endpoint endpoint)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `SendfileDataBase`
  `createSendfileData(String filename, long pos, long length)`
  `void`
  `doClientAuth(SSLSupport sslSupport)`
  Require the client to perform CLIENT-CERT authentication if it hasn't already done so.
  `protected void`
  `doClose()`
  Perform the actual close.
  `protected void`
  `doWrite(boolean block, ByteBuffer from)`
  Write the contents of the ByteBuffer to the socket.
  `protected void`
  `flushBlocking()`
  Writes all remaining data from the buffers and blocks until the write is complete.
  `protected boolean`
  `flushNonBlocking()`
  Writes as much data as possible from any that remains in the buffers.
  `Nio2Endpoint.SendfileData`
  `getSendfileData()`
  `SSLSupport`
  `getSslSupport()`
  Obtain an SSLSupport instance for this socket.
  `boolean`
  `hasAsyncIO()`
  Allows using NIO2 style read/write.
  `boolean`
  `hasDataToRead()`
  `boolean`
  `hasDataToWrite()`
  `boolean`
  `hasPerOperationTimeout()`
  Allows indicating if the connector supports per operation timeout.
  `boolean`
  `isReadPending()`
  Allows checking if an asynchronous read operation is currently pending.
  `boolean`
  `isReadyForRead()`
  `boolean`
  `isReadyForWrite()`
  Checks to see if there are any writes pending and if there are calls `SocketWrapperBase.registerWriteInterest()` to trigger a callback once the pending writes have completed.
  `boolean`
  `isWritePending()`
  Allows checking if an asynchronous write operation is currently pending.
  `boolean`
  `needSemaphores()`
  Allows indicating if the connector needs semaphores.
  `protected <A> SocketWrapperBase<Nio2Channel>.OperationState<A>`
  `newOperationState(boolean read, ByteBuffer[] buffers, int offset, int length, SocketWrapperBase.BlockingMode block, long timeout, TimeUnit unit, A attachment, SocketWrapperBase.CompletionCheck check, CompletionHandler<Long, ? super A> handler, Semaphore semaphore, SocketWrapperBase<Nio2Channel>.VectoredIOCompletionHandler<A> completion)`
  `protected void`
  `populateLocalAddr()`
  `protected void`
  `populateLocalName()`
  `protected void`
  `populateLocalPort()`
  `protected void`
  `populateRemoteAddr()`
  `protected void`
  `populateRemoteHost()`
  `protected void`
  `populateRemotePort()`
  `SendfileState`
  `processSendfile(SendfileDataBase sendfileData)`
  Starts the sendfile process.
  `int`
  `read(boolean block, byte[] b, int off, int len)`
  `int`
  `read(boolean block, ByteBuffer to)`
  `void`
  `registerReadInterest()`
  `void`
  `registerWriteInterest()`
  `void`
  `setAppReadBufHandler(ApplicationBufferHandler handler)`
  `void`
  `setSendfileData(Nio2Endpoint.SendfileData sf)`
  `protected void`
  `writeNonBlocking(byte[] buf, int off, int len)`
  Transfers the data to the socket write buffer (writing that data to the socket if the buffer fills up using a non-blocking write) until either all the data has been transferred and space remains in the socket write buffer or a non-blocking write leaves data in the socket write buffer.
  `protected void`
  `writeNonBlocking(ByteBuffer from)`
  Transfers the data to the socket write buffer (writing that data to the socket if the buffer fills up using a non-blocking write) until either all the data has been transferred and space remains in the socket write buffer or a non-blocking write leaves data in the socket write buffer.
  `protected void`
  `writeNonBlockingInternal(ByteBuffer from)`
  Separate method so it can be re-used by the socket write buffer to write data to the network

  ### Methods inherited from class SocketWrapperBase

  `buffersArrayHasRemaining, canWrite, checkError, close, decrementKeepAlive, doWrite, execute, flush, getCurrentProcessor, getEndpoint, getError, getLocalAddr, getLocalName, getLocalPort, getLock, getNegotiatedProtocol, getReadTimeout, getRemoteAddr, getRemoteHost, getRemotePort, getServletConnection, getSniHostName, getSocket, getSocketBufferHandler, getWriteTimeout, isClosed, populateReadBuffer, populateReadBuffer, processSocket, read, read, read, reset, setCurrentProcessor, setError, setKeepAliveLeft, setNegotiatedProtocol, setReadTimeout, setSniHostName, setWriteTimeout, takeCurrentProcessor, toString, transfer, transfer, unRead, vectoredOperation, write, write, write, write, write, writeBlocking, writeBlocking`

  ### Methods inherited from class Object

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

- ## Constructor Details

  - ### Nio2SocketWrapper

    public Nio2SocketWrapper(Nio2Channel channel, Nio2Endpoint endpoint)

- ## Method Details

  - ### setSendfileData

    public void setSendfileData(Nio2Endpoint.SendfileData sf)

  - ### getSendfileData

    public Nio2Endpoint.SendfileData getSendfileData()

  - ### isReadyForRead

    public boolean isReadyForRead() throws IOException
    Specified by:
      `isReadyForRead` in class `SocketWrapperBase<Nio2Channel>`
    Throws:
      `IOException`

  - ### isReadyForWrite

    public boolean isReadyForWrite()
    Description copied from class: `SocketWrapperBase`
    Checks to see if there are any writes pending and if there are calls `SocketWrapperBase.registerWriteInterest()` to trigger a callback once the pending writes have completed.

    Note: Once this method has returned `false` it MUST NOT be called again until the pending write has completed and the callback has been fired. TODO: Modify `SocketWrapperBase.registerWriteInterest()` so the above restriction is enforced there rather than relying on the caller.

    Overrides:
      `isReadyForWrite` in class `SocketWrapperBase<Nio2Channel>`
    Returns:
      `true` if no writes are pending and data can be written otherwise `false`

  - ### read

    public int read(boolean block, byte[] b, int off, int len) throws IOException
    Specified by:
      `read` in class `SocketWrapperBase<Nio2Channel>`
    Throws:
      `IOException`

  - ### read

    public int read(boolean block, ByteBuffer to) throws IOException
    Specified by:
      `read` in class `SocketWrapperBase<Nio2Channel>`
    Throws:
      `IOException`

  - ### doClose

    protected void doClose()
    Description copied from class: `SocketWrapperBase`
    Perform the actual close. The closed atomic boolean guarantees this will be called only once per wrapper.
    Specified by:
      `doClose` in class `SocketWrapperBase<Nio2Channel>`

  - ### hasAsyncIO

    public boolean hasAsyncIO()
    Description copied from class: `SocketWrapperBase`
    Allows using NIO2 style read/write.
    Overrides:
      `hasAsyncIO` in class `SocketWrapperBase<Nio2Channel>`
    Returns:
      `true` if the connector has the capability enabled

  - ### needSemaphores

    public boolean needSemaphores()
    Description copied from class: `SocketWrapperBase`
    Allows indicating if the connector needs semaphores.
    Overrides:
      `needSemaphores` in class `SocketWrapperBase<Nio2Channel>`
    Returns:
      This default implementation always returns `false`

  - ### hasPerOperationTimeout

    public boolean hasPerOperationTimeout()
    Description copied from class: `SocketWrapperBase`
    Allows indicating if the connector supports per operation timeout.
    Overrides:
      `hasPerOperationTimeout` in class `SocketWrapperBase<Nio2Channel>`
    Returns:
      This default implementation always returns `false`

  - ### newOperationState

    protected <A> SocketWrapperBase<Nio2Channel>.OperationState<A> newOperationState(boolean read, ByteBuffer[] buffers, int offset, int length, SocketWrapperBase.BlockingMode block, long timeout, TimeUnit unit, A attachment, SocketWrapperBase.CompletionCheck check, CompletionHandler<Long, ? super A> handler, Semaphore semaphore, SocketWrapperBase<Nio2Channel>.VectoredIOCompletionHandler<A> completion)
    Specified by:
      `newOperationState` in class `SocketWrapperBase<Nio2Channel>`

  - ### writeNonBlocking

    protected void writeNonBlocking(byte[] buf, int off, int len) throws IOException
    Transfers the data to the socket write buffer (writing that data to the socket if the buffer fills up using a non-blocking write) until either all the data has been transferred and space remains in the socket write buffer or a non-blocking write leaves data in the socket write buffer. After an incomplete write, any data remaining to be transferred to the socket write buffer will be copied to the socket write buffer. If the remaining data is too big for the socket write buffer, the socket write buffer will be filled and the additional data written to the non-blocking write buffer.

    Overridden for NIO2 to enable a gathering write to be used to write all of the remaining data in a single additional write should a non-blocking write leave data in the buffer.

    Overrides:
      `writeNonBlocking` in class `SocketWrapperBase<Nio2Channel>`
    Parameters:
      `buf` - The byte array containing the data to be written
      `off` - The offset within the byte array of the data to be written
      `len` - The length of the data to be written
    Throws:
      `IOException` - If an IO error occurs during the write

  - ### writeNonBlocking

    protected void writeNonBlocking(ByteBuffer from) throws IOException
    Transfers the data to the socket write buffer (writing that data to the socket if the buffer fills up using a non-blocking write) until either all the data has been transferred and space remains in the socket write buffer or a non-blocking write leaves data in the socket write buffer. After an incomplete write, any data remaining to be transferred to the socket write buffer will be copied to the socket write buffer. If the remaining data is too big for the socket write buffer, the socket write buffer will be filled and the additional data written to the non-blocking write buffer.

    Overridden for NIO2 to enable a gathering write to be used to write all of the remaining data in a single additional write should a non-blocking write leave data in the buffer.

    Overrides:
      `writeNonBlocking` in class `SocketWrapperBase<Nio2Channel>`
    Parameters:
      `from` - The ByteBuffer containing the data to be written
    Throws:
      `IOException` - If an IO error occurs during the write

  - ### writeNonBlockingInternal

    protected void writeNonBlockingInternal(ByteBuffer from) throws IOException
    Separate method so it can be re-used by the socket write buffer to write data to the network

    Overridden for NIO2 to enable a gathering write to be used to write all of the remaining data in a single additional write should a non-blocking write leave data in the buffer.

    Overrides:
      `writeNonBlockingInternal` in class `SocketWrapperBase<Nio2Channel>`
    Parameters:
      `from` - The ByteBuffer containing the data to be written
    Throws:
      `IOException` - If an IO error occurs during the write

  - ### doWrite

    protected void doWrite(boolean block, ByteBuffer from) throws IOException
    Description copied from class: `SocketWrapperBase`
    Write the contents of the ByteBuffer to the socket. For blocking writes either then entire contents of the buffer will be written or an IOException will be thrown. Partial blocking writes will not occur.
    Specified by:
      `doWrite` in class `SocketWrapperBase<Nio2Channel>`
    Parameters:
      `block` - Ignored since this method is only called in the blocking case
      `from` - the ByteBuffer containing the data to be written
    Throws:
      `IOException` - If an I/O error such as a timeout occurs during the write

  - ### flushBlocking

    protected void flushBlocking() throws IOException
    Description copied from class: `SocketWrapperBase`
    Writes all remaining data from the buffers and blocks until the write is complete.
    Overrides:
      `flushBlocking` in class `SocketWrapperBase<Nio2Channel>`
    Throws:
      `IOException` - If an IO error occurs during the write

  - ### flushNonBlocking

    protected boolean flushNonBlocking() throws IOException
    Description copied from class: `SocketWrapperBase`
    Writes as much data as possible from any that remains in the buffers.
    Specified by:
      `flushNonBlocking` in class `SocketWrapperBase<Nio2Channel>`
    Returns:
      `true` if data remains to be flushed after this method completes, otherwise `false`.
    Throws:
      `IOException` - If an IO error occurs during the write

  - ### hasDataToRead

    public boolean hasDataToRead()
    Overrides:
      `hasDataToRead` in class `SocketWrapperBase<Nio2Channel>`

  - ### hasDataToWrite

    public boolean hasDataToWrite()
    Overrides:
      `hasDataToWrite` in class `SocketWrapperBase<Nio2Channel>`

  - ### isReadPending

    public boolean isReadPending()
    Description copied from class: `SocketWrapperBase`
    Allows checking if an asynchronous read operation is currently pending.
    Overrides:
      `isReadPending` in class `SocketWrapperBase<Nio2Channel>`
    Returns:
      `true` if the endpoint supports asynchronous IO and a read operation is being processed asynchronously

  - ### isWritePending

    public boolean isWritePending()
    Description copied from class: `SocketWrapperBase`
    Allows checking if an asynchronous write operation is currently pending.
    Overrides:
      `isWritePending` in class `SocketWrapperBase<Nio2Channel>`
    Returns:
      `true` if the endpoint supports asynchronous IO and a write operation is being processed asynchronously

  - ### registerReadInterest

    public void registerReadInterest()
    Specified by:
      `registerReadInterest` in class `SocketWrapperBase<Nio2Channel>`

  - ### registerWriteInterest

    public void registerWriteInterest()
    Specified by:
      `registerWriteInterest` in class `SocketWrapperBase<Nio2Channel>`

  - ### createSendfileData

    public SendfileDataBase createSendfileData(String filename, long pos, long length)
    Specified by:
      `createSendfileData` in class `SocketWrapperBase<Nio2Channel>`

  - ### processSendfile

    public SendfileState processSendfile(SendfileDataBase sendfileData)
    Description copied from class: `SocketWrapperBase`
    Starts the sendfile process. It is expected that if the sendfile process does not complete during this call and does not report an error, that the caller will not add the socket to the poller (or equivalent). That is the responsibility of this method.
    Specified by:
      `processSendfile` in class `SocketWrapperBase<Nio2Channel>`
    Parameters:
      `sendfileData` - Data representing the file to send
    Returns:
      The state of the sendfile process after the first write.

  - ### populateRemoteAddr

    protected void populateRemoteAddr()
    Specified by:
      `populateRemoteAddr` in class `SocketWrapperBase<Nio2Channel>`

  - ### populateRemoteHost

    protected void populateRemoteHost()
    Specified by:
      `populateRemoteHost` in class `SocketWrapperBase<Nio2Channel>`

  - ### populateRemotePort

    protected void populateRemotePort()
    Specified by:
      `populateRemotePort` in class `SocketWrapperBase<Nio2Channel>`

  - ### populateLocalName

    protected void populateLocalName()
    Specified by:
      `populateLocalName` in class `SocketWrapperBase<Nio2Channel>`

  - ### populateLocalAddr

    protected void populateLocalAddr()
    Specified by:
      `populateLocalAddr` in class `SocketWrapperBase<Nio2Channel>`

  - ### populateLocalPort

    protected void populateLocalPort()
    Specified by:
      `populateLocalPort` in class `SocketWrapperBase<Nio2Channel>`

  - ### getSslSupport

    public SSLSupport getSslSupport()
    Description copied from class: `SocketWrapperBase`
    Obtain an SSLSupport instance for this socket.
    Specified by:
      `getSslSupport` in class `SocketWrapperBase<Nio2Channel>`
    Returns:
      An SSLSupport instance for this socket.

  - ### doClientAuth

    public void doClientAuth(SSLSupport sslSupport) throws IOException
    Description copied from class: `SocketWrapperBase`
    Require the client to perform CLIENT-CERT authentication if it hasn't already done so.
    Specified by:
      `doClientAuth` in class `SocketWrapperBase<Nio2Channel>`
    Parameters:
      `sslSupport` - The SSL/TLS support instance currently being used by the connection that may need updating after the client authentication
    Throws:
      `IOException` - If authentication is required then there will be I/O with the client and this exception will be thrown if that goes wrong

  - ### setAppReadBufHandler

    public void setAppReadBufHandler(ApplicationBufferHandler handler)
    Specified by:
      `setAppReadBufHandler` in class `SocketWrapperBase<Nio2Channel>`