# Class AjpProcessor

java.lang.Object
org.apache.coyote.AbstractProcessorLight
org.apache.coyote.AbstractProcessor
org.apache.coyote.ajp.AjpProcessor

All Implemented Interfaces:
  `ActionHook, Processor`

public class AjpProcessor extends AbstractProcessor
AJP Processor implementation.

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `protected class`
  `AjpProcessor.SocketInputBuffer`
  This class is an input buffer which will read its data from an input stream.
  `protected class`
  `AjpProcessor.SocketOutputBuffer`
  This class is an output buffer which will write data to an output stream.

- ## Field Summary

  ### Fields inherited from class AbstractProcessor

  `adapter, asyncStateMachine, request, response, socketWrapper, sslSupport, userDataHelper`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `AjpProcessor(AbstractAjpProtocol<?> protocol, Adapter adapter)`
  Constructs a new AjpProcessor.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `protected final void`
  `ack(ContinueResponseTiming continueResponseTiming)`
  Process acknowledgment of the request.
  `protected final int`
  `available(boolean doRead)`
  Queries if bytes are available in buffers.
  `protected final void`
  `disableSwallowRequest()`
  Swallowing bytes is required for pipelining requests, so this allows to avoid doing extra operations in case an error occurs and the connection is to be closed instead.
  `protected AbstractEndpoint.Handler.SocketState`
  `dispatchEndRequest()`
  Perform any necessary clean-up processing if the dispatch resulted in the completion of processing for the current request.
  `protected void`
  `dispatchNonBlockingRead()`
  Perform any necessary processing for a non-blocking read before dispatching to the adapter.
  `protected void`
  `earlyHints()`
  Process early hints (103 Early Hints).
  `protected final void`
  `finishResponse()`
  Finish the current response.
  `protected final void`
  `flush()`
  Callback to write data from the buffer.
  `protected boolean`
  `flushBufferedWrite()`
  Flush any pending writes.
  `protected Log`
  `getLog()`
  Returns the logger associated with this processor type.
  `protected final boolean`
  `getPopulateRequestAttributesFromSocket()`
  Processors that populate request attributes directly (e.g.
  `protected ServletConnection`
  `getServletConnection()`
  Protocols must override this method and return an appropriate ServletConnection instance
  `protected final boolean`
  `isReadyForWrite()`
  Checks if the processor is ready for writing.
  `protected final boolean`
  `isRequestBodyFullyRead()`
  Checks if the request body has been fully read.
  `protected boolean`
  `isTrailerFieldsReady()`
  Checks if trailer fields are ready.
  `void`
  `pause()`
  Informs the processor that the underlying I/O layer has stopped accepting new connections.
  `protected void`
  `populateHost()`
  Called when a host header is not present in the request (e.g.
  `protected void`
  `populatePort()`
  Called when a host header is not present or is empty in the request (e.g.
  `protected final void`
  `populateRequestAttributeRemoteHost()`
  Populate the remote host request attribute.
  `protected final void`
  `populateSslRequestAttributes()`
  Populate the TLS related request attributes from the `SSLSupport` instance associated with this processor.
  `protected final void`
  `prepareResponse()`
  When committing the response, we have to validate the set of headers, as well as setup the response filters.
  `void`
  `recycle()`
  Recycle the processor, ready for the next request which may be on the same connection or a different connection.
  `protected boolean`
  `refillReadBuffer(boolean block)`
  Get more request body data from the web server and store it in the internal buffer.
  `protected final void`
  `registerReadInterest()`
  When using non blocking IO, register to get a callback when polling determines that bytes are available for reading.
  `AbstractEndpoint.Handler.SocketState`
  `service(SocketWrapperBase<?> socket)`
  Service a 'standard' HTTP request.
  `protected final void`
  `setRequestBody(ByteChunk body)`
  Set the specified byte chunk as the request body that will be read.
  `protected final void`
  `setSwallowResponse()`
  The response is finished and no additional bytes need to be sent to the client.

  ### Methods inherited from class AbstractProcessor

  `action, asyncPostProcess, checkAsyncTimeoutGeneration, dispatch, doHttpUpgrade, execute, executeDispatches, getAdapter, getAsyncTimeout, getErrorState, getLeftoverInput, getProtocolRequestId, getRequest, getSocketWrapper, getUpgradeToken, isAsync, isReadyForRead, isTrailerFieldsSupported, isUpgrade, logAccess, parseHost, processSocketEvent, setAsyncTimeout, setErrorState, setSocketWrapper, setSslSupport, sslReHandShake, timeoutAsync`

  ### Methods inherited from class AbstractProcessorLight

  `addDispatch, clearDispatches, getIteratorAndClearDispatches, process`

  ### Methods inherited from class Object

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

- ## Constructor Details

  - ### AjpProcessor

    public AjpProcessor(AbstractAjpProtocol<?> protocol, Adapter adapter)
    Constructs a new AjpProcessor.
    Parameters:
      `protocol` - The AJP protocol
      `adapter` - The adapter for this processor

- ## Method Details

  - ### flushBufferedWrite

    protected boolean flushBufferedWrite() throws IOException
    Description copied from class: `AbstractProcessor`
    Flush any pending writes. Used during non-blocking writes to flush any remaining data from a previous incomplete write.
    Specified by:
      `flushBufferedWrite` in class `AbstractProcessor`
    Returns:
      `true` if data remains to be flushed at the end of method
    Throws:
      `IOException` - If an I/O error occurs while attempting to flush the data

  - ### dispatchNonBlockingRead

    protected void dispatchNonBlockingRead()
    Description copied from class: `AbstractProcessor`
    Perform any necessary processing for a non-blocking read before dispatching to the adapter.
    Overrides:
      `dispatchNonBlockingRead` in class `AbstractProcessor`

  - ### dispatchEndRequest

    protected AbstractEndpoint.Handler.SocketState dispatchEndRequest()
    Description copied from class: `AbstractProcessor`
    Perform any necessary clean-up processing if the dispatch resulted in the completion of processing for the current request.
    Specified by:
      `dispatchEndRequest` in class `AbstractProcessor`
    Returns:
      The state to return for the socket once the clean-up for the current request has completed

  - ### service

    public AbstractEndpoint.Handler.SocketState service(SocketWrapperBase<?> socket) throws IOException
    Description copied from class: `AbstractProcessorLight`
    Service a 'standard' HTTP request. This method is called for both new requests and for requests that have partially read the HTTP request line or HTTP headers. Once the headers have been fully read this method is not called again until there is a new HTTP request to process. Note that the request type may change during processing which may result in one or more calls to `AbstractProcessorLight.dispatch(SocketEvent)`. Requests may be pipe-lined.
    Specified by:
      `service` in class `AbstractProcessorLight`
    Parameters:
      `socket` - The connection to process
    Returns:
      The state the caller should put the socket in when this method returns
    Throws:
      `IOException` - If an I/O error occurs during the processing of the request

  - ### recycle

    public void recycle()
    Description copied from interface: `Processor`
    Recycle the processor, ready for the next request which may be on the same connection or a different connection.
    Specified by:
      `recycle` in interface `Processor`
    Overrides:
      `recycle` in class `AbstractProcessor`

  - ### pause

    public void pause()
    Description copied from interface: `Processor`
    Informs the processor that the underlying I/O layer has stopped accepting new connections. This is primarily intended to enable processors that use multiplexed connections to prevent further 'streams' being added to an existing multiplexed connection.

  - ### refillReadBuffer

    protected boolean refillReadBuffer(boolean block) throws IOException
    Get more request body data from the web server and store it in the internal buffer.
    Parameters:
      `block` - `true` if this is blocking IO
    Returns:
      `true` if there is more data, `false` if not.
    Throws:
      `IOException` - An IO error occurred

  - ### populateHost

    protected void populateHost()
    Called when a host header is not present in the request (e.g. HTTP/1.0). It populates the server name with appropriate information. The source is expected to vary by protocol.

    The default implementation is a NO-OP.

    This implementation populates the server name from the local name provided by the AJP message.

    Overrides:
      `populateHost` in class `AbstractProcessor`

  - ### populatePort

    protected void populatePort()
    Called when a host header is not present or is empty in the request (e.g. HTTP/1.0). It populates the server port with appropriate information. The source is expected to vary by protocol.

    The default implementation is a NO-OP.

    This implementation populates the server port from the local port provided by the AJP message.

    Overrides:
      `populatePort` in class `AbstractProcessor`

  - ### prepareResponse

    protected final void prepareResponse() throws IOException
    When committing the response, we have to validate the set of headers, as well as setup the response filters.
    Specified by:
      `prepareResponse` in class `AbstractProcessor`
    Throws:
      `IOException` - IO exception during commit

  - ### flush

    protected final void flush() throws IOException
    Description copied from class: `AbstractProcessor`
    Callback to write data from the buffer.
    Specified by:
      `flush` in class `AbstractProcessor`
    Throws:
      `IOException` - IO exception during the write

  - ### finishResponse

    protected final void finishResponse() throws IOException
    Description copied from class: `AbstractProcessor`
    Finish the current response.
    Specified by:
      `finishResponse` in class `AbstractProcessor`
    Throws:
      `IOException` - IO exception during the write

  - ### ack

    protected final void ack(ContinueResponseTiming continueResponseTiming)
    Description copied from class: `AbstractProcessor`
    Process acknowledgment of the request.
    Specified by:
      `ack` in class `AbstractProcessor`
    Parameters:
      `continueResponseTiming` - specifies when an acknowledgment should be sent

  - ### earlyHints

    protected void earlyHints() throws IOException
    Description copied from class: `AbstractProcessor`
    Process early hints (103 Early Hints).
    Specified by:
      `earlyHints` in class `AbstractProcessor`
    Throws:
      `IOException` - IO exception during processing

  - ### available

    protected final int available(boolean doRead)
    Description copied from class: `AbstractProcessor`
    Queries if bytes are available in buffers.
    Specified by:
      `available` in class `AbstractProcessor`
    Parameters:
      `doRead` - `true` to perform a read when no bytes are availble
    Returns:
      the amount of bytes that are known to be available

  - ### setRequestBody

    protected final void setRequestBody(ByteChunk body)
    Description copied from class: `AbstractProcessor`
    Set the specified byte chunk as the request body that will be read. This allows saving and processing requests.
    Specified by:
      `setRequestBody` in class `AbstractProcessor`
    Parameters:
      `body` - the byte chunk containing all the request bytes

  - ### setSwallowResponse

    protected final void setSwallowResponse()
    Description copied from class: `AbstractProcessor`
    The response is finished and no additional bytes need to be sent to the client.
    Specified by:
      `setSwallowResponse` in class `AbstractProcessor`

  - ### disableSwallowRequest

    protected final void disableSwallowRequest()
    Description copied from class: `AbstractProcessor`
    Swallowing bytes is required for pipelining requests, so this allows to avoid doing extra operations in case an error occurs and the connection is to be closed instead.
    Specified by:
      `disableSwallowRequest` in class `AbstractProcessor`

  - ### getPopulateRequestAttributesFromSocket

    protected final boolean getPopulateRequestAttributesFromSocket()
    Description copied from class: `AbstractProcessor`
    Processors that populate request attributes directly (e.g. AJP) should over-ride this method and return `false`.
    Overrides:
      `getPopulateRequestAttributesFromSocket` in class `AbstractProcessor`
    Returns:
      `true` if the SocketWrapper should be used to populate the request attributes, otherwise `false`.

  - ### populateRequestAttributeRemoteHost

    protected final void populateRequestAttributeRemoteHost()
    Description copied from class: `AbstractProcessor`
    Populate the remote host request attribute. Processors (e.g. AJP) that populate this from an alternative source should override this method.
    Overrides:
      `populateRequestAttributeRemoteHost` in class `AbstractProcessor`

  - ### populateSslRequestAttributes

    protected final void populateSslRequestAttributes()
    Description copied from class: `AbstractProcessor`
    Populate the TLS related request attributes from the `SSLSupport` instance associated with this processor. Protocols that populate TLS attributes from a different source (e.g. AJP) should override this method.
    Overrides:
      `populateSslRequestAttributes` in class `AbstractProcessor`

  - ### isRequestBodyFullyRead

    protected final boolean isRequestBodyFullyRead()
    Description copied from class: `AbstractProcessor`
    Checks if the request body has been fully read.
    Specified by:
      `isRequestBodyFullyRead` in class `AbstractProcessor`
    Returns:
      `true` if it is known that the request body has been fully read

  - ### registerReadInterest

    protected final void registerReadInterest()
    Description copied from class: `AbstractProcessor`
    When using non blocking IO, register to get a callback when polling determines that bytes are available for reading.
    Specified by:
      `registerReadInterest` in class `AbstractProcessor`

  - ### isReadyForWrite

    protected final boolean isReadyForWrite()
    Description copied from class: `AbstractProcessor`
    Checks if the processor is ready for writing.
    Specified by:
      `isReadyForWrite` in class `AbstractProcessor`
    Returns:
      `true` if bytes can be written without blocking

  - ### isTrailerFieldsReady

    protected boolean isTrailerFieldsReady()
    Description copied from class: `AbstractProcessor`
    Checks if trailer fields are ready.
    Specified by:
      `isTrailerFieldsReady` in class `AbstractProcessor`
    Returns:
      `true` if trailer fields are ready

  - ### getLog

    protected Log getLog()
    Description copied from class: `AbstractProcessorLight`
    Returns the logger associated with this processor type.
    Specified by:
      `getLog` in class `AbstractProcessorLight`
    Returns:
      the logger associated with this processor type

  - ### getServletConnection

    protected ServletConnection getServletConnection()
    Description copied from class: `AbstractProcessor`
    Protocols must override this method and return an appropriate ServletConnection instance
    Specified by:
      `getServletConnection` in class `AbstractProcessor`
    Returns:
      the ServletConnection instance associated with the current request.