CometConnectionManagerValve (Apache Tomcat 7.0.76 API Documentation)

org.apache.catalina.valves

## Class CometConnectionManagerValve

- java.lang.Object
- - org.apache.catalina.util.LifecycleBase
  - - org.apache.catalina.util.LifecycleMBeanBase
    - - org.apache.catalina.valves.ValveBase
      - - org.apache.catalina.valves.CometConnectionManagerValve

- All Implemented Interfaces:
    EventListener, MBeanRegistration, HttpSessionListener, Contained, Lifecycle, LifecycleListener, Valve

      public class CometConnectionManagerValve
      extends ValveBase
      implements HttpSessionListener, LifecycleListener

  Implementation of a Valve that tracks Comet connections, and closes them when the associated session expires or the webapp is reloaded.

  This Valve should be attached to a Context.

  Author:
    Remy Maucherat

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle

      `Lifecycle.SingleUse`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected List<Request>` | `cometRequests` List of current Comet connections.
    `protected String` | `cometRequestsAttribute` Name of session attribute used to store list of comet connections.
    `protected static String` | `info` The descriptive information related to this implementation.

    - ### Fields inherited from class org.apache.catalina.valves.ValveBase

      `asyncSupported, container, containerLog, next, sm`

    - ### Fields inherited from class org.apache.catalina.util.LifecycleMBeanBase

      `mserver`

    - ### Fields inherited from interface org.apache.catalina.Lifecycle

      `AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `CometConnectionManagerValve()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `event(Request request, Response response, CometEvent event)` Use events to update the connection state.
    `String` | `getInfo()` Return descriptive information about this Valve implementation.
    `void` | `invoke(Request request, Response response)` Register requests for tracking, whenever needed.
    `void` | `lifecycleEvent(LifecycleEvent event)` Acknowledge the occurrence of the specified event.
    `void` | `sessionCreated(HttpSessionEvent se)` Notification that a session was created.
    `void` | `sessionDestroyed(HttpSessionEvent se)` Notification that a session is about to be invalidated.
    `protected void` | `startInternal()` Start this component and implement the requirements of `LifecycleBase.startInternal()`.
    `protected void` | `stopInternal()` Stop this component and implement the requirements of `LifecycleBase.stopInternal()`.

    - ### Methods inherited from class org.apache.catalina.valves.ValveBase

      `backgroundProcess, getContainer, getDomainInternal, getNext, getObjectNameKeyProperties, initInternal, isAsyncSupported, setAsyncSupported, setContainer, setNext, toString`

    - ### Methods inherited from class org.apache.catalina.util.LifecycleMBeanBase

      `destroyInternal, getDomain, getObjectName, postDeregister, postRegister, preDeregister, preRegister, register, setDomain, unregister`

    - ### Methods inherited from class org.apache.catalina.util.LifecycleBase

      `addLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, init, removeLifecycleListener, setState, setState, start, stop`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### info

          protected static final String info

      The descriptive information related to this implementation.
      See Also:
        Constant Field Values

    - #### cometRequests

          protected final List<Request> cometRequests

      List of current Comet connections.

    - #### cometRequestsAttribute

          protected final String cometRequestsAttribute

      Name of session attribute used to store list of comet connections.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### CometConnectionManagerValve

          public CometConnectionManagerValve()

  - ### Method Detail

    - #### startInternal

          protected void startInternal()
                                throws LifecycleException

      Start this component and implement the requirements of `LifecycleBase.startInternal()`.
      Overrides:
        `startInternal` in class `ValveBase`
      Throws:
        `LifecycleException` - if this component detects a fatal error that prevents this component from being used

    - #### stopInternal

          protected void stopInternal()
                               throws LifecycleException

      Stop this component and implement the requirements of `LifecycleBase.stopInternal()`.
      Overrides:
        `stopInternal` in class `ValveBase`
      Throws:
        `LifecycleException` - if this component detects a fatal error that prevents this component from being used

    - #### lifecycleEvent

          public void lifecycleEvent(LifecycleEvent event)

      Description copied from interface: `LifecycleListener`
      Acknowledge the occurrence of the specified event.
      Specified by:
        `lifecycleEvent` in interface `LifecycleListener`
      Parameters:
        `event` - LifecycleEvent that has occurred

    - #### getInfo

          public String getInfo()

      Return descriptive information about this Valve implementation.
      Specified by:
        `getInfo` in interface `Valve`
      Overrides:
        `getInfo` in class `ValveBase`

    - #### invoke

          public void invoke(Request request,
                    Response response)
                      throws IOException,
                             ServletException

      Register requests for tracking, whenever needed.
      Specified by:
        `invoke` in interface `Valve`
      Specified by:
        `invoke` in class `ValveBase`
      Parameters:
        `request` - The servlet request to be processed
        `response` - The servlet response to be created
      Throws:
        `IOException` - if an input/output error occurs
        `ServletException` - if a servlet error occurs

    - #### event

          public void event(Request request,
                   Response response,
                   CometEvent event)
                     throws IOException,
                            ServletException

      Use events to update the connection state.
      Specified by:
        `event` in interface `Valve`
      Overrides:
        `event` in class `ValveBase`
      Parameters:
        `request` - The servlet request to be processed
        `response` - The servlet response to be created
      Throws:
        `IOException` - if an input/output error occurs
        `ServletException` - if a servlet error occurs

    - #### sessionCreated

          public void sessionCreated(HttpSessionEvent se)

      Description copied from interface: `javax.servlet.http.HttpSessionListener`
      Notification that a session was created.
      Specified by:
        `sessionCreated` in interface `HttpSessionListener`
      Parameters:
        `se` - the notification event

    - #### sessionDestroyed

          public void sessionDestroyed(HttpSessionEvent se)

      Description copied from interface: `javax.servlet.http.HttpSessionListener`
      Notification that a session is about to be invalidated.
      Specified by:
        `sessionDestroyed` in interface `HttpSessionListener`
      Parameters:
        `se` - the notification event

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