Tài liệu Comet and Reverse Aiax

Chapter 1: What Are Comet and Reverse Ajax? 1
The Tmiihle with HTTP .> , 2
Some Common Use Cases . 5
Monitoring and Data Feeds 5
Progress Updates 6
Chat and Collaboration 8
Siimmaiy ^
Chapter 2: Simple Ways to Achieve Push 11
The Magnetic Poetry Appiicatkm . i I
Creating New Words 15
Reading Words 15
Updating Words 17
Deleting Words 18
Ifttroiinemg Push Using Polling 19
Improving Efficiency Using Piggyhaeiiing 25
Sinmmijy .^
Chapter 3: Introducing Comet 33
Implementing a Comet Feed Using XHR 33
Script Tags, Iframes, ami Comei 40
Comet and Reverse Aiax firstPress i
Long Polling ã. 41
Issues with Naive Comet Implementations 47
Request Limits in the Browser 48
Server-Side Performance Concerns 50
Network Infrastructure 50
Summary 51
Chapter 4: Comet the Easy Way 53
The Emergence of Comet Tools .ãã. 53
Direct Web Remoting ã 54
DWR in Action 55
DWRServlet 58
DWR and Comet. .- ã ã 62
Magnetic Poetry Meets DWR on the Client Side 62
Magnetic Poetry and DWR on the Server Side 64
Routing Magnetic Poetry Events 66
Wrapping Up This Implementation 68
Summary 69
Chapter 5: Scaling Comet in Java 71
Thread Management for the Web 71
wait/notify 72
Difficulties in Using wait/notify with Comet 76
Jetty 6 . -. 77
Using Jetty Continuations 77
Understanding the Continuation Mechanism 80
Drawbacks of Continuations 82
ii firstPress Comet and Reverse Ajax
Jetty Continuations and DWR . ã .- .-.ã . *ã -. 83
Future Comet Support in Java 84
Summary 85
Chapter 6: Introducing Bayeux 87
HTTP Request Management . 88
Naming Channels 90
Message Format .91
Standard Channels 94
Transport Negotiation 95
Client-Side Implementations 98
Server-Side Implementations 102
Using Bayeux with Dojo and Jetty 104
Server-Side Messaging Ill
Summary 114
Chapter 7: Combining Comet with CRUD 117
Revisiting Magnetic Poetry 119
Client-Side Initialization Code 120
Server-Side Initialization Code 125
Creating Domain Objects. .128
Comet and Reverse Aiax firstPress iii I
Updating Domain Ot)je€is . 130
Deleting Domain ()hjecis .^
Using Comeidfor Progress Repfpris . 133
Additionai Resonrces 136
Further Reading 136
Further Implementations 137
Emerging Standards 137