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The Classes in the Request-Response Loop
67
Figure 15. Request-Response Loop: Session Level
The objects dedicated to session management ensure that state with
sessionwide scope persists between cycles of the request-response loop.
Two classes are involved at this level:
• WOSession (in Java, WebSession)
Encapsulates the state of a session. WOSession objects persist
between the cycles of the request-response loop. WOSession objects
store (and restore) the pages of a session, the values of session
variables, and any other state that components want to persist
throughout a session. The number of pages stored by the session
object is dependent on the page-cache size set in WOApplication.
Setting the page-cache size is described in the chapter “Managing
State” (page 109). Each session object is identified by a unique session
ID, which is reflected in the URL.
• WOSessionStore (in Java, SessionStore)
Provides the strategy or mechanism through which WOSession objects
are made persistent. A WOSessionStore object stores session objects in
the server or in the page (which can include Netscape cookies), and
restores them upon request by the application.
adaptor
Request
Response
HTTP server
application
session
store
session 1
session 2
- WEBOBJECTS 1
- DEVELOPER’S GUIDE 1
- Contents 3
- Table of Contents 5
- Part II Special Tasks 6
- Managing State 109 6
- Part III WebScript 7
- The WebScript Language 163 7
- Foundation Classes 187 7
- Index 211 7
- Introduction 9
- About This Book 11
- Other Useful Documentation 12
- WEBOBJECTS ESSENTIALS 15
- Chapter 1 17
- <DocumentRoot> 19
- Components 20
- Template 21
- Code or Script File 21
- Bindings 22
- Application Code 23
- Session Code 23
- A Note on WebObjects Classes 23
- Application Directory 24
- WebObjects Adaptors 26
- WODefaultApp 27
- Dynamic Elements 29
- Server-Side Dynamic Elements 31
- Chapter 2 Dynamic Elements 32
- .wod file: 33
- Declarations File Syntax 36
- Client-Side Java Components 37
- Common Methods 41
- Action Methods 43
- Chapter 3 Common Methods 44
- Application Initialization 47
- Session Initialization 48
- Component Initialization 49
- Request-Handling Methods 50
- Invoking an Action 52
- Generating a Response 53
- Chapter 4 55
- Debugging WebScript 57
- Debugging Java 57
- Debugging Techniques 58
- Using Trace Methods 59
- Programming Pitfalls to Avoid 60
- Java Programming Pitfalls 61
- Chapter 5 63
- Server and Application Level 65
- Session Level 66
- Request Level 68
- Page Level 69
- Database Integration Level 71
- Accessing the Session 74
- Assigning Input Values 78
- Generating the Response 80
- How HTML Pages Are Generated 82
- START:Calendar { 85
- SPECIAL TASKS 89
- Creating Reusable Components 91
- Simplifying Interfaces 96
- Intercomponent Communication 98
- Parent's Template File 99
- <DocRoot> 105
- Designing for Reusability 106
- Complete Declaration 107
- Partial Declaration 108
- Managing State 109
- Chapter 7 Managing State 112
- Objects and State 113
- State Storage Strategies 120
- Comparison of Storage Options 121
- State in the Server 123
- State in the Page 124
- State in Cookies 126
- Custom State-Storage Options 128
- Controlling Session State 133
- Setting Session Time-Out 134
- Controlling Component State 135
- Adjusting the Page Cache Size 136
- Using awake and sleep 137
- Client-Side Page Caching 139
- Chapter 8 141
- Choosing a Strategy 143
- Objective-C Java 146
- Chapter 9 149
- Maintaining a Log File 151
- Accessing Statistics 152
- Recording Extra Information 153
- Error Handling 154
- Performance Tips 156
- Compile the Application 157
- Control Memory Leaks 157
- Limit State Storage 158
- Limit Database Fetches 158
- Limit Page Sizes 158
- Installing Applications 159
- WEBSCRIPT 161
- The WebScript Language 163
- Objects in WebScript 165
- WebScript Language Elements 166
- Variables and Scope 167
- Assigning Values to Variables 168
- Invoking Methods 171
- Accessor Methods 171
- Sending a Message to a Class 172
- Creating Instances of Classes 173
- Data Types 174
- Statements and Operators 175
- Control-Flow Statements 176
- Arithmetic Operators 176
- Logical Operators 176
- Relational Operators 176
- Reserved Words 178
- “Modern” WebScript Syntax 179
- Advanced WebScript 181
- Categories 182
- Objective-C WebScript 183
- Chapter 11 187
- Foundation Objects 189
- Determining Equality 190
- Working With Strings 191
- Commonly Used String Methods 192
- Comparing Strings 194
- Converting String Contents 194
- Modifying Strings 195
- Storing Strings 195
- Working With Arrays 196
- Commonly Used Array Methods 196
- Creating Arrays 197
- Querying Arrays 197
- Sorting Arrays 198
- Adding and Removing Objects 198
- Working With Dictionaries 200
- Creating Dictionaries 202
- Querying Dictionaries 203
- Storing Dictionaries 205
- Working With Dates and Times 206
- Commonly Used Date Methods 207
- Representing Dates as Strings 208
- Retrieving Date Elements 208
- – minuteOfHour 209
- – secondOfMinute 209
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