CrawlerSessionManagerValve (Apache Tomcat 11.0.6 API Documentation)
Description: declaration: package: org.apache.catalina.valves, class: CrawlerSessionManagerValve

# Class CrawlerSessionManagerValve

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

All Implemented Interfaces:
  `MBeanRegistration`, `Contained`, `JmxEnabled`, `Lifecycle`, `Valve`

public class CrawlerSessionManagerValve extends ValveBase
Web crawlers can trigger the creation of many thousands of sessions as they crawl a site which may result in significant memory consumption. This Valve ensures that crawlers are associated with a single session - just like normal users - regardless of whether or not they provide a session token with their requests.

- ## Nested Class Summary

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

  `Lifecycle.SingleUse`

- ## Field Summary

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

  `asyncSupported, container, containerLog, next, sm`

  ### 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
  Description
  `CrawlerSessionManagerValve()`
  Specifies a default constructor so async support can be configured.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Map<String,String>`
  `getClientIpSessionId()`
  `String`
  `getCrawlerIps()`
  `String`
  `getCrawlerUserAgents()`
  `int`
  `getSessionInactiveInterval()`
  `protected void`
  `initInternal()`
  Subclasses implement this method to perform any instance initialisation required.
  `void`
  `invoke(Request request, Response response)`
  Perform request processing as required by this Valve.
  `boolean`
  `isContextAware()`
  `boolean`
  `isHostAware()`
  `void`
  `setContextAware(boolean isContextAware)`
  `void`
  `setCrawlerIps(String crawlerIps)`
  Specify the regular expression (using `Pattern`) that will be used to identify crawlers based on their IP address.
  `void`
  `setCrawlerUserAgents(String crawlerUserAgents)`
  Specify the regular expression (using `Pattern`) that will be used to identify crawlers based in the User-Agent header provided.
  `void`
  `setHostAware(boolean isHostAware)`
  `void`
  `setSessionInactiveInterval(int sessionInactiveInterval)`
  Specify the session timeout (in seconds) for a crawler's session.

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

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

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

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

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

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

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

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

- ## Constructor Details

  - ### CrawlerSessionManagerValve

    public CrawlerSessionManagerValve()
    Specifies a default constructor so async support can be configured.

- ## Method Details

  - ### setCrawlerUserAgents

    public void setCrawlerUserAgents(String crawlerUserAgents)
    Specify the regular expression (using `Pattern`) that will be used to identify crawlers based in the User-Agent header provided. The default is ".*GoogleBot.*|.*bingbot.*|.*Yahoo! Slurp.*"
    Parameters:
      `crawlerUserAgents` - The regular expression using `Pattern`

  - ### getCrawlerUserAgents

    public String getCrawlerUserAgents()
    Returns:
      The current regular expression being used to match user agents.
    See Also:
      - `setCrawlerUserAgents(String)`

  - ### setCrawlerIps

    public void setCrawlerIps(String crawlerIps)
    Specify the regular expression (using `Pattern`) that will be used to identify crawlers based on their IP address. The default is no crawler IPs.
    Parameters:
      `crawlerIps` - The regular expression using `Pattern`

  - ### getCrawlerIps

    public String getCrawlerIps()
    Returns:
      The current regular expression being used to match IP addresses.
    See Also:
      - `setCrawlerIps(String)`

  - ### setSessionInactiveInterval

    public void setSessionInactiveInterval(int sessionInactiveInterval)
    Specify the session timeout (in seconds) for a crawler's session. This is typically lower than that for a user session. The default is 60 seconds.
    Parameters:
      `sessionInactiveInterval` - The new timeout for crawler sessions

  - ### getSessionInactiveInterval

    public int getSessionInactiveInterval()
    Returns:
      The current timeout in seconds
    See Also:
      - `setSessionInactiveInterval(int)`

  - ### getClientIpSessionId

    public Map<String,String> getClientIpSessionId()

  - ### isHostAware

    public boolean isHostAware()

  - ### setHostAware

    public void setHostAware(boolean isHostAware)

  - ### isContextAware

    public boolean isContextAware()

  - ### setContextAware

    public void setContextAware(boolean isContextAware)

  - ### initInternal

    protected void initInternal() throws LifecycleException
    Description copied from class: `LifecycleBase`
    Subclasses implement this method to perform any instance initialisation required.
    Overrides:
      `initInternal` in class `ValveBase`
    Throws:
      `LifecycleException` - If the initialisation fails

  - ### invoke

    public void invoke(Request request, Response response) throws IOException, ServletException
    Description copied from interface: `Valve`

    Perform request processing as required by this Valve.

    An individual Valve MAY perform the following actions, in the specified order:

    - Examine and/or modify the properties of the specified Request and Response.
    - Examine the properties of the specified Request, completely generate the corresponding Response, and return control to the caller.
    - Examine the properties of the specified Request and Response, wrap either or both of these objects to supplement their functionality, and pass them on.
    - If the corresponding Response was not generated (and control was not returned), call the next Valve in the pipeline (if there is one) by executing `getNext().invoke()`.
    - Examine, but not modify, the properties of the resulting Response (which was created by a subsequently invoked Valve or Container).

    A Valve MUST NOT do any of the following things:

    - Change request properties that have already been used to direct the flow of processing control for this request (for instance, trying to change the virtual host to which a Request should be sent from a pipeline attached to a Host or Context in the standard implementation).
    - Create a completed Response AND pass this Request and Response on to the next Valve in the pipeline.
    - Consume bytes from the input stream associated with the Request, unless it is completely generating the response, or wrapping the request before passing it on.
    - Modify the HTTP headers included with the Response after the `getNext().invoke()` method has returned.
    - Perform any actions on the output stream associated with the specified Response after the `getNext().invoke()` method has returned.
    Parameters:
      `request` - The servlet request to be processed
      `response` - The servlet response to be created
    Throws:
      `IOException` - if an input/output error occurs, or is thrown by a subsequently invoked Valve, Filter, or Servlet
      `ServletException` - if a servlet error occurs, or is thrown by a subsequently invoked Valve, Filter, or Servlet