Designing Java applications for network computers

Contents......Page 5
Figures......Page 9
Tables......Page 11
The Team That Wrote This Redbook......Page 13
Comments Welcome......Page 14
1.1 Network Computing......Page 17
1.3 IBM Network Station Hardware......Page 18
1.3.2 How the IBM Network Station Works......Page 19
1.3.2.2 Network Station Operation......Page 20
1.4.1 Boot Server......Page 21
1.5.1 Network Function......Page 22
1.6 Java—A Good Language for Network Computing......Page 23
1.6.1 Java Development Kit......Page 24
1.6.3 Java Run-Time Environment......Page 25
1.6.3.1 Java Virtual Machine......Page 26
1.7 Java Program Types......Page 28
1.7.2 Java Applets......Page 29
1.7.4.2 Java Objects......Page 30
1.7.5.1 Class Creation......Page 31
1.7.5.3 Communication......Page 32
1.7.5.4 The Future of the IBM Network Station......Page 33
1.8 Network Computing using WorkSpace On-Demand......Page 34
2.1 Overview......Page 37
2.2 Basic NCF Principles......Page 39
2.3 Building NCF Solutions......Page 40
2.3.3 Commerce Solutions......Page 41
2.4 NCF Architecture......Page 42
2.4.2 Clients......Page 43
2.4.3 Network Infrastructure......Page 44
2.4.4 Foundation Services......Page 46
2.4.6 Web Application Programming Environment......Page 47
2.4.8 Systems Management......Page 48
2.4.9 e-business Application Services......Page 49
2.5.1 Dynamic Web Applications......Page 50
2.5.2 JavaBeans......Page 51
2.5.3.1 What Are Enterprise JavaBeans?......Page 52
2.5.4.1 Content Authoring Tools......Page 53
2.6.1.2 Apache HTTP Server......Page 54
2.6.2.2 e-Network Host on Demand......Page 55
2.6.3.2 Workspace On-Demand......Page 56
3.2 WorldWide Trucking Company......Page 59
3.3 Transport Request Application......Page 62
3.3.1 Application Re-Use......Page 64
3.4 Truck Tracking Application......Page 66
4.1 Thin Client......Page 67
4.1.3 Principle: Keep Software Local......Page 68
4.2.1.1 Principle: Download Only What is Needed......Page 69
4.3 Portability......Page 70
4.3.2 Issue: Different Behavior of Platforms......Page 71
4.4 Soft Failure......Page 72
4.5.1 Issue: Transaction Rollback in a Diskless Environment......Page 73
4.5.1.1 Principle: Don’t Depend on Rollbacks for NCs......Page 74
4.6.1 Issue: Providing Session Context for NC-Based Applications......Page 75
4.6.1.1 Cookies: A Common, but Unacceptable Solution......Page 76
4.6.1.2 Principle: Verify and Validate Current Session Context......Page 77
4.7 Remote Object Persistence and Serialization......Page 78
4.7.1.1 Principle: Know Your Security Model......Page 79
4.7.2.2 Principle: Distinguish between Applets and Applications......Page 80
4.8.1.1 Scenario: Concurrent Access of a Common Resource......Page 81
4.8.1.2 Principle: Concurrency Control......Page 82
4.9.1.1 Synchronization: A Java Solution to Concurrency Problems......Page 83
4.9.1.2 Solution in Distributed Object Environments......Page 84
4.9.2 JavaBean Synchronization......Page 85
5.2 Implementing the NCF Model Using the Java Language......Page 87
5.2.1.5 Java Accessibility......Page 88
5.2.2.4 JDBC Database Access......Page 89
5.2.4 Applets......Page 90
5.2.4.2 Applets as JavaBeans......Page 91
5.2.4.3 Considerations for Applet Programming......Page 95
5.2.4.4 Sample Applet Code......Page 97
5.2.4.5 Run Time......Page 100
5.2.4.7 Applet Execution Life Cycle......Page 103
5.2.5.2 Servlets as JavaBeans......Page 104
5.2.5.3 Run Time......Page 105
5.2.6 Basic Communication......Page 106
5.2.6.2 Streams......Page 107
5.2.7.1 AppletContext......Page 108
5.3 Distributed Object Architecture......Page 109
5.3.1.1 RMI Architecture......Page 110
5.3.1.2 Development......Page 111
5.3.1.5 JavaBeans and RMI......Page 114
5.3.1.6 Run Time......Page 126
5.3.2 Common Object Request Broker Architecture (CORBA)......Page 127
5.3.2.2 Architecture......Page 128
5.3.2.3 Development......Page 131
5.3.2.5 Run Time......Page 132
5.3.3 RMI over IIOP......Page 133
6.2.1 Corrective Maintenance......Page 135
6.2.1.1 Implications for Distributed Objects......Page 136
6.2.2.1 Implications for Java......Page 138
6.2.3.1 To Compile or Not to Compile: the Maintainer’s Dilemma......Page 140
6.3 Conclusion......Page 142
A.1.3 Token Ring......Page 143
A.4 Network Resources......Page 144
A.4.2 Resource Users......Page 145
B.1 Physical Layer......Page 147
B.4.1 TCP......Page 148
B.7 Application Layer......Page 149
C.1.2 Tc - The Consumer......Page 151
C.1.3 Tp - The Producer......Page 152
C.2.1 R - The Resource......Page 153
C.2.2 Tc - The Consumer......Page 154
C.2.3 Tp - The Producer......Page 155
C.3 Solution Limitations......Page 156
Appendix D. Special Notices......Page 157
E.3 Other Publications......Page 159
How IBM Employees Can Get ITSO Redbooks......Page 161
How Customers Can Get ITSO Redbooks......Page 162
IBM Redbook Order Form......Page 163
List of Abbreviations......Page 165
Index......Page 167
ITSO Redbook Evaluation......Page 173