angularjs - NodeJS Periodic tasks -


firts of all, i'll explain problem:

i'm developing ecommerce website. 1 of features possibility customers create purchasing rules. these rules customer can set start date, periodicity , product purchase. result product purchased every [periodicity] days [start date].

the system developed nodejs back-end, mongodb database , angularjs front-end.

i've found projects scheduling tasks in nodejs. 2 of them are:

both of them great tools have same problem 2 of them. problem need create scheduled tasks stop them. these tools clear how schedule function executed on time, how can stop them @ moment?

the objects provided node-schedule , node-cron have cancel() or stop() method stop scheduling, invoke method need have object.

my question if there way "store" scheduled tasks in database in order able stop them @ moment , anywhere other function created.

and if not possible, if there tool better i've mentioned need.

thank reading , appreciated.

ok, i've found better solution problem adding bunch of scheduled task, 1 purchasing rule. purchasing_rules table looks this:

+--------------------+ |   purchase_rules   | +--------------------+ | customer_id        | | product_id         | | quantity           | | start_date         | | periodicity (days) | +--------------------+

my solution add field next run, table like:

+--------------------+ |   purchase_rules   | +--------------------+ | customer_id        | | product_id         | | quantity           | | start_date         | | periodicity (days) | | next_run           | +--------------------+

by default [next_run] [start_date] + [periodictiy].

and now, magic:

i use node-schedule schedule job every day @ hour. job following:

  1. look in purchase_rules table rule next_run = today
  2. for every rule found:
    1. purchase desired [quantity] of product [product_id] customer [customer_id]
    2. make [next_run] = [next_run] + [periodicity]
  3. finish

this way database not accesed many times agenda package , "stopping" purchasing_rule have remove database.

i hope find useful day.


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