Apple WebObjects 5 Manuel d'utilisateur télécharger pdf (Page 82)

82 Java Client and Other Three-Tier Systems

 Apple Computer, Inc. January 2002

CHAPTER 6

WebObjects Desktop Applications

Client JDBC applications use a fat-client architecture. Custom code invokes JDBC

on the client, which in turn goes through a driver to communicate with a JDBC

proxy on the server. This proxy makes the necessary client-library calls on the

server.

The shortcoming of this architecture are typical of all fat-client architectures.

Security is a problem because the bytecodes on the client are easily decompiled,

leaving both sensitive data and business rules at risk. In addition, this architecture

doesn’t scale; it is expensive to move data over the channel to the client. Also, client

JDBC applications access the datasource directly—there is server layer to validate

data or control access to the datasource.

JDBC three-tier applications (with CORBA as the transport) are a big improvement

over client JDBC applications. In this architecture the client can be thin since all that

is required on the client side are the Java Foundation Classes, nonsensitive custom

code (usually for managing the user interface), and CORBA stubs for

communicating with the server. Sensitive business logic and database connection

logic are stored on the server. In addition, the server handles all data-intensive

computations.

The JDBC three-tier architecture has its own weaknesses. First, it results in too much

network traffic. Because this architecture uses proxy business objects on the client

as handles to real objects on the server, each client request for an attribute is

forwarded to the server, causing a separate round trip. Second, JDBC three-tier

requires developers to write much of the code themselves, from code for database

access and data packaging, to code for user-interface synchronization and change

tracking. Finally JDBC three-tier does not provide much of the functionality

associated with application servers, such as application monitoring and load

balancing, nor does it provide HTML integration.

The Java Client architecture, however, scales well since real data objects live on the

client and roundtrips are made to the server only for database commits and new

data fetches. Also, Java Client applications are designed to leverage custom

business logic which lets you to control which business objects are sent to the client

and to validate data from the client before committing it to the data store.

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 107 108

Commentaires sur ces manuels

Pas de commentaire

Samsung WF0650NHW/XTC User Manual (40 pages)

Brand: Samsung | Category: Washing machines | Size: 4.88 MB |

English

Table of contents

Washing Machine

1

2_ features

2

• Wide door

3

4_ safety information

4

6_ safety information

6

8_ safety information

8

CAUTION SIGNS FOR USING

9

10_ safety information

10

12_ contents

12

CHECKING THE PARTS

13

Water Supply

14

Removing the shipping bolts

16

Adjusting the levelling feet

17

Water supply

18

Water tap

18

Powering your washing machine

20

WASHING FOR THE FIRST TIME

21

BASIC INSTRUCTIONS

21

USING THE CONTROL PANEL

22

Child lock

24

Delay end

24

LAUNDRY GUIDELINES

26

WF0654 / WF0652

27

WF0650 / WF0658

27

WF0550 / WF0558

27

Which detergent to use

28

Detergent drawer

28

CLEANING THE EXTERIOR

29

Release lever

30

Liquid detergent divider

30

CLEANING THE DEBRIS FILTER

31

STORING YOUR WASHING MACHINE

32

INFORMATION CODES

34

CYCLE CHART

35

FABRIC CARE CHART

36

PROTECTING THE ENVIRONMENT

36

DECLARATION OF CONFORMITY

36

SPECIFICATIONS

37

QUESTIONS OR COMMENTS?

40

Samsung WF0650NHW/XTC User Manual (40 pages)

Brand: Samsung | Category: Washing machines | Size: 4.88 MB |

English

Table of contents

Washing Machine

1

2_ features

2

• Wide door

3

4_ safety information

4

6_ safety information

6

8_ safety information

8

CAUTION SIGNS FOR USING

9

10_ safety information

10

12_ contents

12

CHECKING THE PARTS

13

Water Supply

14

Removing the shipping bolts

16

Adjusting the levelling feet

17

Water supply

18

Water tap

18

Powering your washing machine

20

WASHING FOR THE FIRST TIME

21

BASIC INSTRUCTIONS

21

USING THE CONTROL PANEL

22

Child lock

24

Delay end

24

LAUNDRY GUIDELINES

26

WF0654 / WF0652

27

WF0650 / WF0658

27

WF0550 / WF0558

27

Which detergent to use

28

Detergent drawer

28

CLEANING THE EXTERIOR

29

Release lever

30

Liquid detergent divider

30

CLEANING THE DEBRIS FILTER

31

STORING YOUR WASHING MACHINE

32

INFORMATION CODES

34

CYCLE CHART

35

FABRIC CARE CHART

36

PROTECTING THE ENVIRONMENT

36

DECLARATION OF CONFORMITY

36

SPECIFICATIONS

37

QUESTIONS OR COMMENTS?

40

More products and manuals for Washing machines Samsung

Models	Document Type
WF90F5E5U4W/WS	User Manual Samsung WF90F5E5U4W/WS Schnellstartanleitung, 27 pages
WA15F7S4UWA	User Manual Samsung WA13F7S4UWW/SG User Manual, 52 pages
WF80F5E5U4W	User Manual Samsung WFF500E Washer with Eco Bubble, 8 kg Quick start guide, 18 pages
WF7600NAW	User Manual Samsung WF7600NAW User manual, 20 pages
WF90F5E5P4W/EG	User Manual Samsung WF90F5E5P4W/EG Benutzerhandbuch [da] , 44 pages
WF0604NBE	User Manual Samsung WF0604NBE Benutzerhandbuch, 40 pages
J1491ADW	User Manual Samsung J1491ADW Benutzerhandbuch [fr] , 36 pages
J1045AVW/XST	User Manual Samsung J1045AVW/XST คู่มือการใช้, 21 pages
WA10B3	User Manual Samsung WA10B3 User Manual [sk] , 12 pages
WF706U4SAWQ/LE	User Manual Samsung WF706U4SAWQ/LE Navodila za uporabo, 44 pages
WA8565B0	User Manual Samsung WA8565B0 User manual, 11 pages
J1255AVGW	User Manual Samsung J1255AVGW Bruksanvisningar, 24 pages
WF1702WEU/XSG	User Manual Samsung WF1702WEU/XSG User Manual, 88 pages
WA13J5730SS/SG	User Manual Samsung WA13J5730SS/SG User Manual, 88 pages
WW83K5400UW/EG	User Manual Samsung WW83K5400UW/EG, WW5500, Waschmaschine, AddWash™, 8 kg Quick Guide, 11 pages
WA13J5711SG/IM	User Manual Samsung WA90J5710SG User Manual, 44 pages
WF0804Y8E/YLV	User Manual Samsung WF0804Y8E/YLV Owner's manual, 88 pages
J1455AC	User Manual Samsung WW70J4263 Washer with Ecobubble, 7.0 Kg Quick start guide, 14 pages
WA11J5710SG/SG	User Manual Samsung WA11J5710SG/SG User Manual, 88 pages
WW80J3283KW	User Manual Samsung WW80J3283KW User Manual, 224 pages