Reorganize the Handler architecture to a pipeline architecture with plugins.

Now plugins can define additional handlers and the handlers can be organized
into named pipelines.  Modules are no longer the unit of a handler, now we use
classes so we can assert interface conformance.

The GLOBAL_PIPELINE is gone, replaced by the 'built-in' pipeline.  The
OWNER_PIPELINE is not yet replaced.

I still need a few more tests of the basic pipeline architecture, although the
individual handlers have pretty good coverage.

Added the IHandler and IPipeline interfaces.

Still broken, but not yet removed: Mailman/pipeline/moderate.py.

1 files changed, 1 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index 437f6ba2c..8d6bd88c6 100644
--- a/setup.py
+++ b/setup.py
@@ -90,6 +90,7 @@ Any other spelling is incorrect.""",
         'mailman.styles'    : 'default = Mailman.app.styles:DefaultStyle',
         'mailman.mta'       : 'stock = Mailman.MTA:Manual',
         'mailman.rules'     : 'default = Mailman.rules:initialize',
+        'mailman.handlers'  : 'default = Mailman.pipeline:initialize',
         },
     # Third-party requirements.
     install_requires = [