ColdFusion Internals

ColdFusion Internals
Paul Nibin K J
© 2014 Adobe Systems Incorporated. All Rights Reserved. Adobe Confidential.

Introduction
2
Client
Web Server

Agenda
 Life of a CFM request
 Classloading in ColdFusion
 How does RESTful web service work?
3

Life of a request
© 2014 Adobe Systems Incorporated. All Rights Reserved. Adobe Confidential. 4

Life of request in ColdFusion
5

Template Classloader
In filter chain
6
1.
Request
Validation
• Validates
the
request.
2. Path
Resolution
• Resolve
s
absolute
CFM
Path
3.Application
Resolution
• Locates
Applicati
-on.
• Creates
Applicati
-on
scope.
• Invokes
life cycle
method
4. Parse
• Parse
the CFM
file .
• Generat
e AST
using the
grammar
.
5.Bytecod
e
Generatio
n • Translat
e the
AST to
java byte
code

1. Request Validation
 You are part of request validation too.
 You can configure the following validations through settings.
7
 Request Size Limits
 Request Limits

2. Path Resolution
http://localhost/employee/addEmployee.cfm
/employee/addEmployee.cfm
C:inetpubwwwrootemployeeaddEmployee.cfm
Request URL
Virtual Path
8
Absolute
Path
Connector
You can cache the web server path using an admin setting.

3. Application Resolution
 Finds the Application.cfc
9
 Creates Application Scope
 Invokes Life cycle methods
 OnApplicationStart()
 OnRequestStart()
 OnError()

 Finds the Application.cfc
10
 Creates Application Scope
 Invokes Life cycle methods
 OnApplicationStart()
 OnRequestStart()
 OnError()
Start
Check for the
Application.cfc in
current directory.
Found
Application.cf
c?
Found Application
Check for the
Application.cfc in
parent directory.
Yes
No
Setting to specify till what level
ColdFusion should search for
Application.cfc

Unnamed applications
http://localhost/axis1Test/basic.cfc?wsdl
axis1Test
11
Application.cfc
<cfcomponent>
<cfset this.wssettings.version.publish=“1”>
</cfcomponent>
basic.cfc
axis2Test
Application.cfc
<cfcomponent>
<cfset this.wssettings.version.publish=“2”>
</cfcomponent>
basic.cfc
http://localhost/axis2Test/basic.cfc?wsdl
ColdFusion disables the creation of un named applications using an
admin setting.

4. Parsing
12
<cfscript>
function hello() {
writeOutput("hello");
}
hello();
</cfscript>
Template
Reader
Abstract Syntax Tree (AST)

4. Parsing
13
<cfscript>
function hello() {
writeOutput("hello");
}
hello();
</cfscript>
Template
Reader
Abstract Syntax Tree (AST)

Template Reader
 Reads the CFM and creates a stream.
Encoding?
14

Automatic encoding identification
15
Start
Use
encoding
Is BOM
present?
Guess
encoding
(icu4j)
Is guess
probability
100%?
End
Yes
Yes
No
Save the file with
BOM
<cfprocessingdirective
..>
Use system
encoding
End
No
-Dfile.encoding=“”

5. Byte code generation
AST
<cfusion_Root>wwwrootWEB-INF
16
Byte Code
Engineering Library
(BCEL)
cfclasses
Byte Code

Template Classloader
17
Start
Is
class
in
cache
?
Check Last
Modified Date of
CFM
Is
Modifie
d?
Parse
Generate
byte code
Load byte
code
End
Use cached Class
No
Yes
No
Yes
Clear template
cache
Enable trusted
cache

Summary
 ColdFusion filter chain has 5 main phases
18
1. Request Validation
o Settings in administrator
2. Path Resolution
o Cache web server path setting
o Finding Application.cfc
o Unnamed applications
4. Parsing
o File encoding
5. Bytecode generation
o Template Classloader

Classloading

Class Loading
 -Dcoldfusion.classPath = {application.home}/lib/updates,
{application.home}/lib,{application.home}/lib/axis2,{application.home}/gat
eway/lib/,…
20
 In jvm.config
ClassLoader
cfusion/lib
cfusion/lib/update
s
cfusion/lib/axis
2

Prior to CF10
Create a folder in cfusionlib.
Copy your jars to the new folder.
Edit jvm.config to add the new folder to the end of coldfusion.classPath
property
21
Cons
 Conflicts
 May hamper normal server functioning.
 Any changes in jar files need server restart to take effect.

CF10 and afterwards
 CF10 introduced enhanced java integration.
 Application setting available to specify custom classpath.
 <cfset this.javaSettings = {LoadPaths = [".java_lib",".javamyjar.jar"],
reloadOnChange = false}>
22
Pros
 Complete isolation
 Will not affect server functioning
 Allows reloading

RESTful web services

RESTful web services
 The W3C defines a Web service as:
a software system designed to support interoperable
machine-to-machine interaction over a network.
 A webservice becomes RESTful when the following 4 constraints are
satisfied.
1. Addressability
2. Multiple Representations
3. Uniform and constrained interfaces
4. Stateless communication

How does RESTful web service work?
 Two logical sections
Registratio
n
Usage

Why?
Traditional web service
POST /students/StudentsService HTTP/1.1
Host: http://localhost:8500
Content-Type: soap/xml
<Envelope>
<Header></Header>
<Body>
<GetStudent>
<Id>112</Id>
</GetStudent>
</Body>
<Envelope>
RESTful web service
GET /students/112 HTTP/1.1
Host: http://localhost:8500
Accepts: text/html

Registration Workflow
 Registration is the process of making your service ready for use.
27
Register
application
Scanning
for REST
CFC
Generate
skeleton
Annotate
skeleton
Register
with Jersey
 Inputs: Application Root Path and Service Name

Settings
28
Register
application
Scanning
for REST
CFC
• restsettings.cfclocatio
n
Generate
skeleton
• restsettings.skipCFCWithE
rror
Annotate
skeleton
Register
with Jersey

Usage Workflow
 Inputs: HTTP request
 The URL of the request
 HTTP Headers
 Body of the request
 Query params, Cookies, Matrix params etc..
29

Explaning the URL
 http:// + localhost:8500 + /rest + /examples + /helloworld
30
http • The protocol
localhost:8500 • Server address and port
• Context path used to identify the request as a
REST request rest
examples • The application name used during registration
helloworld • restPath defined in the CFC

Request Workflow
31
Identify
REST
request
Identifies
application
Identifies
CFC
Identifies
function
Invokes
Function

Settings
32
Identify
REST
request
• Change context
path in web.xml
Identifies
application
• Can make
application default if
needed
Identifies
CFC
Identifies
function
Invokes
Function
• use custom
serializer to modify
response

Summary
 RESTful web services introduction
 Why RESTful web service needs to be registered first?
33
 Registration workflow
o Settings
 Request Workflow
 Settings

Q & A
pnibinkj@adobe.com
http://blogs.coldfusion.com/

ColdFusion Internals

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