#sora # Notes--Workflow

This is only a simple note, Group,chord and other content to read the document directly

Subtask is actually a signature that can be passed around

One usage of raw is:

>>> from celery import signature

>>> signature (' Tasks.add ', args= (2, 2), countdown=10)

Tasks.add (2, 2)

Official usage:

>>> Add.subtask ((2, 2), countdown=10)

Tasks.add (2, 2)

Simple usage:

>>> Add.s (2, 2)

Tasks.add (2, 2)

>>> Add.s (2, 2, debug=true)

Tasks.add (2, 2, debug=true)

More examples:

>>> s = Add.subtask ((2, 2), {' Debug ': True}, countdown=10)

>>> S.args

(2, 2)

>>> S.kwargs

{' Debug ': True}

>>> s.options

{' Countdown ': 10}

>>> Add.apply_async (args, Kwargs, **options)

>>> add.subtask (args, Kwargs, **options). Apply_async ()

>>> Add.apply_async ((2, 2), countdown=1)

>>> Add.subtask ((2, 2), countdown=1). Apply_async ()

This situation will be performed directly locally:

>>> Add (2, 2)

4

>>> Add.s (2, 2) ()

4

When you use S (), you cannot define option, only with Set

>>> Add.s (2, 2). Set (Countdown=1)

Proj.tasks.add (2, 2)

In many cases, parameters can be provided separately ( this is a very important feature!!!). ):

>>> partial = Add.s (2) # Incomplete signature

>>> Partial.delay (4) # 2 + 4

>>> Partial.apply_async (4,) # same

>>> s = Add.s (2, 2)

>>> S.delay (debug=true) #, add (2, 2, debug=true)

>>> s.apply_async (kwargs={' Debug ': True}) # same

In this case, option is overwritten with the original subtask definition:

>>> s = Add.subtask ((2, 2), countdown=10)

>>> S.apply_async (countdown=1) # countdown is now 1

You can derive the new subtask by cloning an existing one with an incomplete parameter subtask

>>> s = Add.s (2)

Proj.tasks.add (2)

>>> S.clone (args= (4,), kwargs={' Debug ': True})

Proj.tasks.add (2, 4, debug=true)

But this is the case:

>>> C = Add.s (32140,32492)

>>> C ()

64632

>>> C

Proj.agent.add (32140, 32492)

>>> k = C.clone (args= (24,434))

>>> K

Proj.agent.add (434, 32140, 32492) #调用会产生错误

>>>

Result is immutable by the immutable parameter setting

>>> Add.apply_async ((2, 2), Link=reset_buffers.subtask (immutable=true))

>>> Add.apply_async ((2, 2), link=reset_buffers.si ())

Here is an example;

>>> res = (add.si (2,5) | add.si (12,1) | add.si (2,2)) () #在这种情况下, chain only functions that combine tasks together, each SI () provides full parameters , otherwise error >>> Res.get () 4>>> res = (add.si (2,5) | add.si (12,1) | add.si (2,2)). Delay () >>> Res.get ( ) 4>>> Res.parent.get () #可以检查chain中各部分的result13 >>> RES.PARENT.P Arent.get (7)

Link is set to callback

The use of link is as follows:

Add.apply_async ((2, 2), LINK=OTHER_TASK.S ())

You can also use link to provide the parameters separately:

>>> Add.apply_async ((2, 2), Link=add.s (8))

Equivalent (+ +8)

#sora # Notes--Workflow