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Revised 3.3

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Jonatan Pålsson 2011-05-12 20:31:23 +02:00
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@ -3655,8 +3655,8 @@ The cost of swapping operating system processes becomes a problem when many
If the GGS system had been developed using regular operating system processes, If the GGS system had been developed using regular operating system processes,
it would have had to be designed in a way to minimize the number of processes. it would have had to be designed in a way to minimize the number of processes.
Using Erlang, which is capable of running very many processes, several Using Erlang, which is capable of running very many processes, several
times more than an operating system, the relation between the real times more than an operating system, the relation between the real world
world and the GGS (described in and the GGS (described in
\begin_inset CommandInset ref \begin_inset CommandInset ref
LatexCommand vref LatexCommand vref
reference "sec:Design-of-the" reference "sec:Design-of-the"
@ -4375,7 +4375,20 @@ target "http://www.objectmentor.com/resources/articles/srp.pdf"
are widely respected as good practices in the world of software engineering are widely respected as good practices in the world of software engineering
and development. and development.
By dividing the GGS up into modules each part of the GGS can be modified By dividing the GGS up into modules each part of the GGS can be modified
without damaging the rest of the system. without damaging, or requiring changes in the rest of the system.
Due to the hot code updates featured in Erlang, it is theoretically possible
to update parts of the GGS while the system is running, this has however
not been implemented in the prototype.
The modular composition of the GGS prototype should make a transition to
a folly hot code swappable system relatively easy.
Hot code replacements are discussed in more detail in section
\begin_inset CommandInset ref
LatexCommand ref
reference "sub:Hot-code-replacement"
\end_inset
.
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
@ -4393,7 +4406,8 @@ reference "cha:Theory"
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
In the text below the word module refers to the actual code of the discussed In the text below the different modules of the GGS are presented.
In the text the word module refers to the actual code of the discussed
feature, while the word process is used when referring to a running instance feature, while the word process is used when referring to a running instance
of the code. of the code.
\begin_inset ERT \begin_inset ERT
@ -6196,6 +6210,13 @@ To the left normal execution is pictured; the server state is backed up.
\begin_layout Subsection \begin_layout Subsection
Hot code replacement Hot code replacement
\begin_inset CommandInset label
LatexCommand label
name "sub:Hot-code-replacement"
\end_inset
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard

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