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I've been researching Zend Framework lately and was curious about what's actually happening behind the scene of the whole dispatch process. I found a wonderful diagram created by Thorsten Ruf (http://nethands.de/download/zenddispatch_en.pdf) Inspired by it's clear and beautifully presented workflow, I decided to go a step deeper and crawl Zend Framework's code. I came up with my own version of the flexible yet complicated workflow. The Zend Framework version is 1.7, noting that things might have changed a bit in the latest 1.8 version that was released a weeks ago.
Citation preview
Zend Framework Basic Request Workflow Chartpu
blic
/inde
x.ph
pap
plic
atio
n/bo
otst
rap.
php
End
Use
r’s
Bro
wse
r
Request for a page
Requires
application/bootstrap.php
Configure include paths
URL
Register Custom Plugin Initializer that runs $this->initDb(); $this->initHelpers(); $this->initView(); $this->initPlugins(); $this->initRoutes(); $this->initControllers();
Prepares Front Controller
Pass inEnvironment
(development/staging/...)
Pass in Optional CustomRequest & Response
Object
Runs
Front Controller Dispatch
V 1.01, Created by Polley Wong
Front Controller Dispatch Workflow Chart
Rou
ter
Plu
gin
Bro
ker
Fron
t Con
trolle
r
Register Request Object
and Response Object
with Plugin Broker
Instantiate Default
Response Objectif none provided
Instantiate Default Request Object if none
provided
Notify Plugin Broker
of Router Startup
Run Plugin’s routeStartup()
More Plugins with routeStartup() method? Yes
No
Start Routing
Find a matching route to the
current PATH_INFO
Inject returning values to the
Request Object
Notify Plugin Broker
of Router Completion
YesMore Plugins with routeShutdown()
method?
Run Plugin’s routeShutdown()
Extract Module, Controller, Action and Parameters
Runs
Front Controller Dispatch
No
V 1.01, Created by Polley Wong
Front Controller Dispatch Workflow Chart
Rou
ter
Plu
gin
Bro
ker
Fron
t Con
trolle
r
Yes
No
Yes
Runs
Front Controller Dispatch
Run Plugin’s routeShutdown()
Inject returning values to the
Request Object
Run Plugin’s routeStartup()
Notify Plugin Broker
of Router Startup
More Plugins with routeShutdown()
method?
Notify Plugin Broker
of Router Completion
Instantiate Default
Response Objectif none provided
Start Routing
Extract Module, Controller, Action and Parameters
More Plugins with routeStartup() method?
Find a matching route to the
current PATH_INFO
Instantiate Default Request Object if none
provided
Register Request Object
and Response Object
with Plugin Broker
No
cont.
V 1.01, Created by Polley Wong
Routing Process
Front Controller Dispatch Workflow ChartP
lugi
n B
roke
rFr
ont C
ontro
ller
RequestObject
Yes
No
Yes
RequestObject
No
Request ObjectNo: and
Response Object
Yes
RequestObject No
Yes
Yes
Replace current Action Skip current action
More Plugins with postDispatch()
method?
Run Plugin’s preDispatch()
Run Plugin’s dispatchLoopStartup()
More Plugins with dispatchLoopStartup()
method?
Set Request Object'’s
“isDispatched Flag”to
TRUE
Notify Plugin Broker
of Dispatch
Completion
More Plugins with preDispatch()
method?
Did anypreDispatch() reset “isDispatched Flag”
to FALSE?
Run Plugin’s postDispatch()
Notify Plugin Broker
of Dispatch Loop
Startup
Notify Plugin Broker
of Dispatch Startup
Did anypostDispatch() reset “isDispatched Flag”
to FALSE?
Action Controller Dispatch Process
Replace current Action OR
Skip current action
cont.
cont.
postDispatch ProcesspreDispatch Process
V 1.01, Created by Polley Wong
Front Controller Dispatch Workflow ChartA
ctio
n H
elpe
r B
roke
rA
ctio
n C
ontro
ller
Con
trolle
r Dis
patc
her
Plug
in B
roke
rFr
ont C
ontro
ller
RequestObject
Yes
No
Yes
RequestObject
No
Request ObjectNo: and
Response Object
Yes
RequestObject No
Yes
Yes
Replace current Action Skip current action
TRUE
FALSE
TRUE
FALSE
Yes
No
Yes
NoNo
Yes
Run Plugin’s postDispatch()
Notify Plugin Broker
of Dispatch Loop
Startup
Run init() method
in helper
More helper in stack?
More Plugins with postDispatch()
method?
Initialize Action Helper Broker
RretrieveAction Method
Name from Request Object
Run setActionController()
method in helper
Notify Plugin Broker
of Dispatch Startup cont.
Notify Helper Broker
of Dispatch Completion
More Helpers with preDispatch()
method?
Load Controllerclass file
Set Request Object'’s
“isDispatched Flag”to
TRUE
Run Action Controller’s
postDispatch()
More Helpers with postDispatch()
method?
Did anypreDispatch() reset “isDispatched Flag”
to FALSE?
Is parameter disableOutputBuffering
TRUE (default)or FALSE?
Run Plugin’s dispatchLoopStartup()
Run Action Controller’s
preDispatch()
Is“isDispatched
Flag” ==TRUE?
Append buffered content into
Response Object’s body
Notify Plugin Broker
of Dispatch
Completion
Call of theAction Method
Run Plugin’s preDispatch()
Register Action Controller
with Helper Broker
Action Controller Dispatch Process
Call Action Controller’s dispatch() method
(Passes the Name of Actionto the method) Destroy Action
Controller Object
Set Request Object'’s
“isDispatched Flag”to
TRUE
Is parameter disableOutputBuffering
TRUE (default)or FALSE?
Run Helper’s preDispatch()
output buffer start
Replace current Action OR
Skip current action
Did anypostDispatch() reset “isDispatched Flag”
to FALSE?
Run Helper’s postDispatch()
Notify Helper Broker
of Dispatch Startup
More Plugins with dispatchLoopStartup()
method?
More Plugins with preDispatch()
method?
postDispatch ProcesspreDispatch Process
cont.
V 1.01, Created by Polley Wong
Front Controller Dispatch Workflow Chart
End
Use
r’s
Bro
wse
rR
espo
nse
Obj
ect
Plu
gin
Bro
ker
Fron
t Con
trolle
r
RequestObject
Yes
No
More Plugins with dispatchLoopShutdown()
method?
Return the Response Object
Run Plugin’s dispatchLoopShutdown()
Notify Plugin Broker
of Dispatch Loop
Completion
Is “returnResponse” Flag set to TRUE?
Yes
sendResponse()
Send Headers Output Body(echo $content)
Waiting for User Input
cont.
postDispatch Process (cont.)
V 1.01, Created by Polley Wong
