Databases Reference
In-Depth Information
Figure 4: Information of access rights to shared documents
the second phase evaluation group. In the document browser, the contents written
in the first phase evaluation are always seen by the user. The contents written in
the second phase evaluation are masked with gray rectangles. When the user want
to see the contents, s/he has to move his/her pointer into the rectangles, then the
contents will be appear. This function is closely related with the functions of
Channel
Checker
. The contents written in the last phase evaluation are not shown. Thus,
the user does not know the existence of the contents.
When the user moves his/her pointer into the gray rectangles,
Channel Checker
shows who can see the contents of the part and the channel for voice conversation
will be changed so that the user can speak only users who can see the contents.
Therefore, when the user speaks about the contents masked with the rectangles,
the contents of the conversation are not transmitted to users who cannot see the
part and security or privacy will be ensured.
Environment and Awareness.
Use of VIEW Media to realize a debate system is
discussed in
37)
, where environment information is displayed for awareness purpose.
3.5
Implementation
VIEW Media has client-server architecture, as it is shown in Figure 5. All
fundamental component objects are managed on the server.
VIEW Media is written in Java
27)
(JDK1.1.5) with HORB
30)
distributed object
environment. Figure 6 shows the screen shot of VIEW Media client. Resource
Manage Server runs on the host running WWW server as a HORB daemon object.
Clients are realized as Java applets, thus users can use VIEW Media on a WWW
browser without any installation procedure. VIEW Media clients provide these
user interfaces as individual tools as follows:
Hypermedia Browser
displays
hypermedia documents of VIEW Media. Users can navigate hypermedia by
following links, and add or delete comments and links by making anchors.
Text
Chat
supports conversation among users using texts.
Awareness Window
displays
