forked from mirrors/gecko-dev
72 lines
2.9 KiB
ReStructuredText
72 lines
2.9 KiB
ReStructuredText
.. _FirstStartup:
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==============
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FirstStartup
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==============
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``FirstStartup`` is a module which is invoked on application startup by the Windows Installer,
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to initialize services before the first application window appears.
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This is useful for:
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- one-time performance tuning
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- downloading critical data (hotfixes, experiments, etc)
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Blocking until the first Application window appears is important because the Installer
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will show a progress bar until this happens. This gives a user experience of:
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1. User downloads and starts the Windows Stub Installer.
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2. Progress bar advances while the application is downloaded and installed.
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3. Installer invokes the application with ``--first-startup``.
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4. Application window appears, and the installer window closes.
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Overall, the user experiences a very fast first-startup, with critical tasks that normally
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would be deferred until after UI startup already complete.
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.. _FirstStartup Architecture:
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FirstStartup: Example use case
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==============================
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An example use of the ``FirstStartup`` module is to invoke the Normandy client to download an experiment
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that will be used to customize the first-run page that Firefox shows.
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In this example, the first-run page would be loaded experimentally based on an attribution code provided
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by the Installer. The flow for this looks like:
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1. User clicks on download link containing an attribution (UTM) code(s).
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2. The download page serves a custom Windows Stub Installer with the appropriate attribution code embedded.
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3. The installer invokes Firefox with the `--first-startup` flag, which blocks the first window.
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4. Normandy is run by ``FirstStartup`` and downloads a list of available experiments, or "recipes".
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5. Recipes are evaluated and filtered based on local information, such as the OS platform and the attribution codes.
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6. A recipe is found which matches the current attribution code, and appropriate data is made available to the first-run page.
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7. ``FirstStartup`` completes and unblocks, which causes Firefox to show the first window and load the appropriate first-run data.
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List of phases
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==============
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``FirstStartup.NOT_STARTED``
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The ``FirstStartup`` module has not been initialized (the ``init()``
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function has not been called). This is the default state.
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``FirstStartup.IN_PROGRESS``
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``FirstStartup.init()`` has been called, and the event loop is
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spinning. This state will persist until either all startup tasks
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have finished, or time-out has been reached.
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The time-out defaults to 5 seconds, but is configurable via the
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``first-startup.timeout`` pref, which is specified in milliseconds.
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``FirstStartup.TIMED_OUT``
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The time-out has been reached before startup tasks are complete.
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``FirstStartup.SUCCESS``
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All startup tasks have completed successfully, and application startup may resume.
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``FirstStartup.UNSUPPORTED``
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No startup tasks are supported, and `FirstStartup` exited.
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