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authorSiri Hansen <[email protected]>2014-06-30 11:27:46 +0200
committerSiri Hansen <[email protected]>2014-10-20 17:06:22 +0200
commit1d4379e307cd7256e019e962b0ece6a1badcffb9 (patch)
treeea8606c7fce452266ac318994c3111ecd0ecc239 /lib/stdlib/src/string.erl
parenta7289521bcb7494f33e86360b096844c5b6bc68d (diff)
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Allow maps for supervisor flags and child specs
Earlier, supervisor flags and child specs were given as tuples. While this is kept for backwards compatibility, it is now also allowed to give these parameters as maps: -type sup_flags() :: #{strategy => strategy(), % optional intensity => non_neg_integer(), % optional period => pos_integer()} % optional -type child_spec() :: #{id => child_id(), % mandatory start => mfargs(), % mandatory restart => restart(), % optional shutdown => shutdown(), % optional type => worker(), % optional modules => modules()} % optional Default values are as follows: Supervisor flags: strategy: one_for_one intensity: 1 period: 5 Child specs: restart: permanent type: worker shutdown: 5000 for workers, 'infinity' for supervisors modules: [M], where M comes from the child's start {M,F,A} Some of these default values are quite hard to decide on, since there really is no "most common way". It always depends on the use case. So we decided that the most important reason for having default values is to lower the start barrier and get "something" running. For production use, most systems must be fine tuned in this respect anyway. This is how we reasoned about it: Strategy: just pick one - and 'one_for_one' was most used in OTP. Max restart frequency (intensity/period): by allowing one restart only we keep the important supervisor feature of restarting children, but we also avoid the possibility of scaling to a huge amount of restarts if the supervisor tree is deep. Restart: just pick one - and 'permanent' is fairly common. Shutdown for workers: to avoid the confusion of why the terminate function is not executed, we decided not to use 'brutal_kill'. Which number to use is probably not that important, so we chose 5000. Shutdown for supervisors: the recommended shutdown value for supervisors is 'infinity', so we decied to use that. Having the same (integer) value as for workers can give very strange results. Type: just pick one - and we believe that 'worker' is most common
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