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Objectives
The Web Whiteboard is a kind of a graphical chat: a lot of users see the
Whiteboard on which the user who holds "a piece of chalk" is drawing.
Initially, the Web Whiteboard had already been implemented as a Java applet.
However, the existing implementation did not satisfy the Customer, as it
contained some bugs, and the applet generated too heavy traffic. Our task was
to correct the mistakes in source code and reduce the traffic.
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Results
The Customer supplied us with the source code of the applet which implemented
functions of the Whiteboard drawing, as well as with the listed bugs to be
corrected, and the requirements for the generated traffic reduction.
The demand was to fix all these issues and implement the measures that would
reduce the traffic.
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Technical peculiarities
This project had a number of peculiarities. First, it was necessary to provide
compatibility with the Netscape Navigator (NN) and Internet Explorer (IE)
browsers by means of JDK 1.1 only. These requirements are rather strict, since
running the same code on the NN and IE virtual machines used to lead to
different results, and JDK 1.1 is short of capabilities. Second, we were
supplied only with the part of the Whiteboard code in which the drawing was
implemented, and with limited access to the module of the data transfer between
the clients. We could upload the drawing module to the Customer's server and
check how it would work. Thus, it was impossible to perform the complete local
debugging. Third, we had to work with the source code absolutely unfamiliar to
us, without any documentation for it.
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