Package org.apache.coyote

## Interface ProtocolHandler

- All Known Implementing Classes:
    `AbstractAjpProtocol`, `AbstractHttp11JsseProtocol`, `AbstractHttp11Protocol`, `AbstractProtocol`, `AjpNio2Protocol`, `AjpNioProtocol`, `Http11Nio2Protocol`, `Http11NioProtocol`

      public interface ProtocolHandler

  Abstract the protocol implementation, including threading, etc. This is the main interface to be implemented by a coyote protocol. Adapter is the main interface to be implemented by a coyote servlet container.
  Author:
    Remy Maucherat, Costin Manolache
  See Also:
    `Adapter`

- - ### Method Summary

    All Methods Static Methods Instance Methods Abstract Methods Default Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `addSslHostConfig​(SSLHostConfig sslHostConfig)` | Add a new SSL configuration for a virtual host.
    `void` | `addSslHostConfig​(SSLHostConfig sslHostConfig, boolean replace)` | Add a new SSL configuration for a virtual host.
    `void` | `addUpgradeProtocol​(UpgradeProtocol upgradeProtocol)` | Add a new protocol for used by HTTP/1.1 upgrade or ALPN.
    `long` | `awaitConnectionsClose​(long waitMillis)` | Wait for the client connections to the server to close gracefully.
    `void` | `closeServerSocketGraceful()` | Close the server socket (to prevent further connections) if the server socket was bound on `start()` (rather than on `init()` but do not perform any further shutdown.
    `static ProtocolHandler` | `create​(String protocol)` | Create a new ProtocolHandler for the given protocol.
    `void` | `destroy()` | Destroy the protocol (optional).
    `SSLHostConfig[]` | `findSslHostConfigs()` | Find all configured SSL virtual host configurations which will be used by SNI.
    `UpgradeProtocol[]` | `findUpgradeProtocols()` | Return all configured upgrade protocols.
    `Adapter` | `getAdapter()` | Return the adapter associated with the protocol handler.
    `default int` | `getDesiredBufferSize()` | Some protocols, like AJP, have a packet length that shouldn't be exceeded, and this can be used to adjust the buffering used by the application layer.
    `Executor` | `getExecutor()` | The executor, provide access to the underlying thread pool.
    `default String` | `getId()` | The default behavior is to identify connectors uniquely with address and port.
    `ScheduledExecutorService` | `getUtilityExecutor()` | Get the utility executor that should be used by the protocol handler.
    `void` | `init()` | Initialise the protocol.
    `boolean` | `isSendfileSupported()` | Does this ProtocolHandler support sendfile?
    `void` | `pause()` | Pause the protocol (optional).
    `void` | `resume()` | Resume the protocol (optional).
    `void` | `setAdapter​(Adapter adapter)` | The adapter, used to call the connector.
    `void` | `setExecutor​(Executor executor)` | Set the optional executor that will be used by the connector.
    `void` | `setUtilityExecutor​(ScheduledExecutorService utilityExecutor)` | Set the utility executor that should be used by the protocol handler.
    `void` | `start()` | Start the protocol.
    `void` | `stop()` | Stop the protocol.

- - ### Method Detail

    - #### getAdapter

          Adapter getAdapter()

      Return the adapter associated with the protocol handler.
      Returns:
        the adapter

    - #### setAdapter

          void setAdapter​(Adapter adapter)

      The adapter, used to call the connector.
      Parameters:
        `adapter` - The adapter to associate

    - #### getExecutor

          Executor getExecutor()

      The executor, provide access to the underlying thread pool.
      Returns:
        The executor used to process requests

    - #### setExecutor

          void setExecutor​(Executor executor)

      Set the optional executor that will be used by the connector.
      Parameters:
        `executor` - the executor

    - #### getUtilityExecutor

          ScheduledExecutorService getUtilityExecutor()

      Get the utility executor that should be used by the protocol handler.
      Returns:
        the executor

    - #### setUtilityExecutor

          void setUtilityExecutor​(ScheduledExecutorService utilityExecutor)

      Set the utility executor that should be used by the protocol handler.
      Parameters:
        `utilityExecutor` - the executor

    - #### init

          void init()
             throws Exception

      Initialise the protocol.
      Throws:
        `Exception` - If the protocol handler fails to initialise

    - #### start

          void start()
              throws Exception

      Start the protocol.
      Throws:
        `Exception` - If the protocol handler fails to start

    - #### pause

          void pause()
              throws Exception

      Pause the protocol (optional).
      Throws:
        `Exception` - If the protocol handler fails to pause

    - #### resume

          void resume()
               throws Exception

      Resume the protocol (optional).
      Throws:
        `Exception` - If the protocol handler fails to resume

    - #### stop

          void stop()
             throws Exception

      Stop the protocol.
      Throws:
        `Exception` - If the protocol handler fails to stop

    - #### destroy

          void destroy()
                throws Exception

      Destroy the protocol (optional).
      Throws:
        `Exception` - If the protocol handler fails to destroy

    - #### closeServerSocketGraceful

          void closeServerSocketGraceful()

      Close the server socket (to prevent further connections) if the server socket was bound on `start()` (rather than on `init()` but do not perform any further shutdown.

    - #### awaitConnectionsClose

          long awaitConnectionsClose​(long waitMillis)

      Wait for the client connections to the server to close gracefully. The method will return when all of the client connections have closed or the method has been waiting for `waitTimeMillis`.
      Parameters:
        `waitMillis` - The maximum time to wait in milliseconds for the client connections to close.
      Returns:
        The wait time, if any remaining when the method returned

    - #### isSendfileSupported

          boolean isSendfileSupported()

      Does this ProtocolHandler support sendfile?
      Returns:
        `true` if this Protocol Handler supports sendfile, otherwise `false`

    - #### addSslHostConfig

          void addSslHostConfig​(SSLHostConfig sslHostConfig)

      Add a new SSL configuration for a virtual host.
      Parameters:
        `sslHostConfig` - the configuration

    - #### addSslHostConfig

          void addSslHostConfig​(SSLHostConfig sslHostConfig,
                                boolean replace)

      Add a new SSL configuration for a virtual host.
      Parameters:
        `sslHostConfig` - the configuration
        `replace` - If `true` replacement of an existing configuration is permitted, otherwise any such attempted replacement will trigger an exception
      Throws:
        `IllegalArgumentException` - If the host name is not valid or if a configuration has already been provided for that host and replacement is not allowed

    - #### findSslHostConfigs

          SSLHostConfig[] findSslHostConfigs()

      Find all configured SSL virtual host configurations which will be used by SNI.
      Returns:
        the configurations

    - #### addUpgradeProtocol

          void addUpgradeProtocol​(UpgradeProtocol upgradeProtocol)

      Add a new protocol for used by HTTP/1.1 upgrade or ALPN.
      Parameters:
        `upgradeProtocol` - the protocol

    - #### findUpgradeProtocols

          UpgradeProtocol[] findUpgradeProtocols()

      Return all configured upgrade protocols.
      Returns:
        the protocols

    - #### getDesiredBufferSize

          default int getDesiredBufferSize()

      Some protocols, like AJP, have a packet length that shouldn't be exceeded, and this can be used to adjust the buffering used by the application layer.
      Returns:
        the desired buffer size, or -1 if not relevant

    - #### getId

          default String getId()

      The default behavior is to identify connectors uniquely with address and port. However, certain connectors are not using that and need some other identifier, which then can be used as a replacement.
      Returns:
        the id

    - #### create

          static ProtocolHandler create​(String protocol)
                                 throws ClassNotFoundException,
                                        InstantiationException,
                                        IllegalAccessException,
                                        IllegalArgumentException,
                                        InvocationTargetException,
                                        NoSuchMethodException,
                                        SecurityException

      Create a new ProtocolHandler for the given protocol.
      Parameters:
        `protocol` - the protocol
      Returns:
        the newly instantiated protocol handler
      Throws:
        `ClassNotFoundException` - Specified protocol was not found
        `InstantiationException` - Specified protocol could not be instantiated
        `IllegalAccessException` - Exception occurred
        `IllegalArgumentException` - Exception occurred
        `InvocationTargetException` - Exception occurred
        `NoSuchMethodException` - Exception occurred
        `SecurityException` - Exception occurred