Dependency groups is useful when you have a list of interrelated items that need to be actioned on in the correct order (package managers are a decent parallel).
- cyclic dependencies throw errors
- no duplicates in the final group
- depth first ordering of services make it easy to action on groups
var group = ;// Imagine you have this list of services. The service can have many// different dependencies (and dependencies can have dependencies,// etc...) the goal is to launch them in the correct order and in// parallel as much as possible.var services =worker: 'queue'appworker: 'worker'app: 'db' 'queue'db: 'monit' 'xvfb'queue: 'monit' 'amqp'monit:xvfb: 'monit'amqp:;// group them together so you can take some action on each groupvar launchGroups = ;// the above will give you this list of groupslaunchGroups ='monit' 'amqp''queue' 'xvfb''worker' 'db''appworker' 'app';// selectively group only some itemsvar workerGroups = ;workerGroups ='monit' 'amqp''queue''worker';
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Copyright (c) 2014 Sahaja James Lal
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