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| The
zeroCode system has two major components - the zeroCode Development
Environment (ZDE) and the run-time environment that sites run
in. The initialization and running sequence for the two segments
are similar, although not identical. Note that the ZDE only
runs on a Linux box, although we plan to evaluate Unix based
installations in the future. The run-time(i.e. the site which
is constructed), on the other hand, is complete Java-based and
runs on any Pure Java platform. It has been tested successfully
on Linux and NT. Unix evaluation will follow soon. |
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| On
a Linux box that runs the ZDE and some sites, there are multiple
instances of Apache running - one for ZDE and one for each site.
When a site is deleted from the list of available sites, the
Apache configuration files are appropriately updated and the
site directories are deleted. Note that the site servers have
to start after the Oracle listener for that site - JDBC has
a bug that causes a "broken pipe" error otherwise. |
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| The
ZDE |
| When
Apache is started for the ZDE, the command in the script gives
Apache the name of the zdeServer.conf file as the configuration
file to use. Specified in there are the following items of information,
along with other (minor?) entries in the file that are not included
below: |
The IP address of the server
The port address that the ZDE is available at (8080)
The default directory for the Apache server
A file to record the PID of the Apache instance
The root directory for the ZDE pages
The error log to use for Apache errors
The file to use for logging access to Apache
The Aliases section, where every site has an entry for the style-sheet,
JavaScript and images directories
The directive to include the Java Servlet configuration file
The rewrite rule that tells the system to redirect all accesses
to the URI udmBuilder/* |
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| The
Java servlet configuration file (zde_jserv.conf) includes the
following information: |
The mount point for a zone called zDE
The directive to include the ZDE jServ properties file (zde_jserv.properties)
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| The
zde_jserv.properties file contains |
The definition of the ZDE zone, along with the root
The major third-party components that ZDE uses - the JDBC drivers,
FreeMarker, etc.
The name of the Java log file
A reference to the properties file for the ZDE site - zde.properties
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