Package org.apache.catalina.valves

Class CrawlerSessionManagerValve

  • All Implemented Interfaces:
    javax.management.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.

    • Constructor Detail

      • CrawlerSessionManagerValve

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

    • Method Detail

      • setCrawlerUserAgents

        public void setCrawlerUserAgents​(java.lang.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 java.lang.String getCrawlerUserAgents()
        Returns:
        The current regular expression being used to match user agents.
        See Also:
        setCrawlerUserAgents(String)

      • setCrawlerIps

        public void setCrawlerIps​(java.lang.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 java.lang.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

      • getClientIpSessionId

        public java.util.Map<java.lang.String,​java.lang.String> getClientIpSessionId()

      • isHostAware

        public boolean isHostAware()

      • setHostAware

        public void setHostAware​(boolean isHostAware)

      • isContextAware

        public boolean isContextAware()

      • setContextAware

        public void setContextAware​(boolean isContextAware)

      • setClientIdentifierFunction

        public void setClientIdentifierFunction​(java.util.function.Function<Request,​java.lang.String> clientIdentifierFunction)
        Specify the clientIdentifier function that will be used to identify unique clients. The default is to use the client IP address, optionally combined with the host name and context name.
        Parameters:
        clientIdentifierFunction - The new function used to build identifiers for clients.

      • invoke

        public void invoke​(Request request,
                   Response response)
            throws java.io.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:
        java.io.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