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
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.
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Nested Class SummaryNested classes/interfaces inherited from interface org.apache.catalina.LifecycleLifecycle.SingleUse
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Field SummaryFields inherited from class org.apache.catalina.valves.ValveBaseasyncSupported, container, containerLog, next, smFields inherited from interface org.apache.catalina.LifecycleAFTER_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
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Constructor SummaryConstructorsConstructorDescriptionSpecifies a default constructor so async support can be configured.
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Method SummaryModifier and TypeMethodDescriptionintprotected voidSub-classes implement this method to perform any instance initialisation required.voidPerform request processing as required by this Valve.booleanbooleanvoidsetContextAware(boolean isContextAware) voidsetCrawlerIps(String crawlerIps) Specify the regular expression (usingPattern) that will be used to identify crawlers based on their IP address.voidsetCrawlerUserAgents(String crawlerUserAgents) Specify the regular expression (usingPattern) that will be used to identify crawlers based in the User-Agent header provided.voidsetHostAware(boolean isHostAware) voidsetSessionInactiveInterval(int sessionInactiveInterval) Specify the session timeout (in seconds) for a crawler's session.Methods inherited from class org.apache.catalina.valves.ValveBasebackgroundProcess, getContainer, getDomainInternal, getNext, getObjectNameKeyProperties, isAsyncSupported, setAsyncSupported, setContainer, setNext, startInternal, stopInternal, toStringMethods inherited from class org.apache.catalina.util.LifecycleMBeanBasedestroyInternal, getDomain, getObjectName, postDeregister, postRegister, preDeregister, preRegister, register, setDomain, unregister, unregisterMethods inherited from class org.apache.catalina.util.LifecycleBaseaddLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, getThrowOnFailure, init, removeLifecycleListener, setState, setState, setThrowOnFailure, start, stop
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Constructor Details- 
CrawlerSessionManagerValvepublic CrawlerSessionManagerValve()Specifies a default constructor so async support can be configured.
 
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Method Details- 
setCrawlerUserAgents
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getCrawlerUserAgents- Returns:
- The current regular expression being used to match user agents.
- See Also:
 
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setCrawlerIps
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getCrawlerIps- Returns:
- The current regular expression being used to match IP addresses.
- See Also:
 
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setSessionInactiveIntervalpublic 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
 
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getSessionInactiveIntervalpublic int getSessionInactiveInterval()- Returns:
- The current timeout in seconds
- See Also:
 
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getClientIpSessionId
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isHostAwarepublic boolean isHostAware()
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setHostAwarepublic void setHostAware(boolean isHostAware) 
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isContextAwarepublic boolean isContextAware()
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setContextAwarepublic void setContextAware(boolean isContextAware) 
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initInternalDescription copied from class:LifecycleBaseSub-classes implement this method to perform any instance initialisation required.- Overrides:
- initInternalin class- ValveBase
- Throws:
- LifecycleException- If the initialisation fails
 
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invokeDescription copied from interface:ValvePerform 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
 
 
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