The document appears to be a sequence diagram showing the process of a request in Tomcat. It shows various components involved like ThreadPool, Http11Protocol, CoyoteAdapter, StandardEngine, StandardPipeline, StandardValveContext, StandardContextValve, StandardHost, ErrorReportValve, ErrorDispatcherValve, StandardHostValve, StandardContext, StandardWrapper, ApplicationFilterChain, and Servlet. The diagram shows the invoke calls between these components as the request is processed through different stages like parsing headers, preparing the request, servicing the request, and returning the response.

1. ThreadPool TcpWorkerThread Http11Protocol CoyoteAdapter StandardEngine StandardPipeline StandardValveCo...
ThreadPool TcpWorkerThread Http11Protocol CoyoteAdapter StandardEngine StandardPipelin
e
StandardValve
Context
runIt() processConnection
process()
parseHeaders()
prepareRequest()
service()
postParseRequest()
invoke()
invoke() invoke()
See next
diagram
File: C:Documents and SettingsAdministratorDesktopTomcat_5_UML.mdl 5:02:06 PM Monday, December 16, 2002 Sequence Diagram: Logical
View / 1. catalina_request Page 1

2. StandardContextValve StandardEngineV... StandardHost ErrorReportValve ErrorDispatcherValve StandardHostValve StandardContext
StandardContextValve StandardEngin
eValve
StandardHost ErrorReportValv
e
ErrorDispatcher
Valve
StandardHostVa
lve
StandardConte
xt
invoke()
map()
invoke()
invoke()
invoke()
report()
invokeNext()
invoke()
invokeNext
invoke()
map() //Context
invoke()
File: C:Documents and SettingsAdministratorDesktopTomcat_5_UML.mdl 5:02:07 PM Monday, December 16, 2002 Sequence Diagram: Logical
View / 2. catalina_request_2 Page 2

3. StandardContext StandardPipeline StandardValveCo... StandardContext... StandardWrapper StandardWrapper... ApplicationFilterC...
StandardConte
xt
StandardPipelin
e
StandardValve
Context
StandardConte
xtValve
StandardWrapp
er
StandardWrapp
erValve
ApplicationFilte
rChain
invoke()
invoke()
invoke()
map //return Wrapper
invoke()
invoke()
invoke()
invoke()
allocate()
return servlet
createFilterChain()
doFilter()
<<Servlet>>
internalDoFilter()
service()return
File: C:Documents and SettingsAdministratorDesktopTomcat_5_UML.mdl 5:02:07 PM Monday, December 16, 2002 Sequence Diagram: Logical
View / 3. catalina_request_3 Page 3