Make test database template creation concurrent build_db_cache() is used in tests to create test database templates, i.e. DEFAULT_EMPTY_DB_ID (which is __default_empty_db__) and custom template database using CubicwebTC test_db_id/pre_setup_database API. When running tests in parallel using multiple processes, build_db_cache() may try to build the same database twice. Avoid this by adding synchronisation of process by using a file lock. So when two processes require the same template database, one build the database and others wait it to be created. Use filelock (https://github.com/benediktschmitt/py-filelock) library to have a portable (unix / windows) way for handling locks. Also filelock is packaged in debian: https://packages.debian.org/source/python-filelock

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.. _ajax:

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Ajax

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----

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CubicWeb provides a few helpers to facilitate *javascript <-> python* communications.

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You can, for instance, register some python functions that will become

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callable from javascript through ajax calls. All the ajax URLs are handled

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by the :class:`cubicweb.web.views.ajaxcontroller.AjaxController` controller.

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.. automodule:: cubicweb.web.views.ajaxcontroller