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Ant Phillips' Blog:
Singletons, BIRT, Theads and PHP
February 18, 2009 @ 12:55:47

In doing some work with Zero (PHP in Java) and the Eclipse Business Intelligence and Reporting Tools project, Ant Phillips had some troubles with multithreaded PHP processes and wanting them all to use the same BIRT instance insted of spawning their own.

The problem is that BIRT needs to be started once, and only once, in any given process. Once it has been started up, then it is plain sailing to load reports and render them to HTML. The BIRT runtime should be kept around until the process shuts down.

Two problems came up with this approach - if each PHP process makes its own BIRT process any settings/current data will be wiped out and the BIRT instance would go away whenever the PHP script finishes. He found something that solves both of these problems - the Zero Global Context. Its a "storage area" that can contain just about anything. He used it to store the BIRT runtime until its told to finish and die off.

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