为python项目实现工作流(或状态机)的库。
xworkflows的Python项目详细描述
xworkflows是一个向python对象添加工作流或状态机的库。
从2.6到3.3的所有python版本都对它进行了全面测试
链接
示例
它允许轻松定义工作流,将其附加到类,并使用其转换:
import xworkflows class MyWorkflow(xworkflows.Workflow): # A list of state names states = ( ('foo', "Foo"), ('bar', "Bar"), ('baz', "Baz"), ) # A list of transition definitions; items are (name, source states, target). transitions = ( ('foobar', 'foo', 'bar'), ('gobaz', ('foo', 'bar'), 'baz'), ('bazbar', 'baz', 'bar'), ) initial_state = 'foo' class MyObject(xworkflows.WorkflowEnabled): state = MyWorkflow() @xworkflows.transition() def foobar(self): return 42 # It is possible to use another method for a given transition. @xworkflows.transition('gobaz') def blah(self): return 13 >>> o = MyObject() >>> o.state <StateWrapper: <State: 'foo'>> >>> o.state.is_foo True >>> o.state.name 'foo' >>> o.state.title 'Foo' >>> o.foobar() 42 >>> o.state <StateWrapper: <State: 'bar'>> >>> o.state.name 'bar' >>> o.state.title 'Bar' >>> o.blah() 13 >>> o.state <StateWrapper: <State: 'baz'>> >>> o.state.name 'baz' >>> o.state.title 'Baz'
挂钩
自定义函数可以挂接到事务,以便在转换之前/之后运行, 进入状态时,离开状态时,…:
class MyObject(xworkflows.WorkflowEnabled): state = MyWorkflow() @xworkflows.before_transition('foobar') def my_hook(self, *args, **kwargs): # *args and **kwargs are those passed to MyObject.foobar(...) pass @xworkflows.on_enter_state('bar') def my_other_hook(self, result, *args, **kwargs): # Will be called just after any transition entering 'bar' # result is the value returned by that transition # *args, **kwargs are the arguments/keyword arguments passed to the # transition. pass