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Managing State

One of WebObjects major benefits as a framework for commercial websites is its seamless handling and storage of per-user data. This chapter describes WebObject's state management system, showing you how it works and how to use it to your greatest advantage.

Table of Contents

Introduction

When Do You Need to Store State?

Objects and State

The Application Object and Application State

The Session Object and Session State

Component Objects and Component State

State Management and the Request-Response Loop

First Contact: A New Session

Accessing an Existing Session

State Storage Strategies

Comparison of Storage Options

A Closer Look at Storage Strategies

State in the Server

State in the Page

State in Cookies

Custom State Storage Options

Storing State for Custom Objects

Using EOEditingContext to Archive Custom Objects

Using the NSCoding Protocol to Archive Custom Objects

Controlling Session State

Creating and Accessing Session State

Managing Session Resources

Setting Session Time-out

Using awake and sleep

Controlling Component State

Creating and Accessing Component State

Managing Component Resources

Adjusting the Page Cache Size

Using awake and sleep

pageWithName: and Page Caching

Client-Side Page Caching

Page Refresh and WODisplayGroup

First Section