I am currently looking into implementing the Database migration hook. I
first considered stacking another service tracker on top of the existing
ones. We already track StringEncryptor, DataSourceFactory and
PooledDataSourceFactory. So I am trying to provide a different approach
to make the code simpler.
I described the concept I use below but for the impatient my limitation
is that I only track one service of each class. So I have a problem with
the possibility of using more than one StringEncryptor in a single config.
So my question is can I add the limitation that each config may contain
only one alias for the encryptor? Possibly also externalizing the alias
into a separate attribute like decryptor=mydecryptor.
Christian
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Concept of the MultiServiceTracker
My idea is to have a MultiServiceTracker. You use it like:
tracker.track(StringEncryptor.class, "(alias=my)");
tracker.track(DataSourceFactory.class, "(name=test)");
tracker.open();
It will call an abstract method activate() when all tracked services are
present and deactivate() when any is lost. Then you can get each service
using:
tracker.getService(StringEncryptor.class)
So this allows to flexibly describe which services we need for a config
without managing your own tracker for each.
Currently I can only manage one service of each class.
--
Christian Schneider
http://www.liquid-reality.de
Open Source Architect
http://www.talend.com
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