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Version as of 2004-10-09 01:35:35

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1 Introduction

The purpose of this page is to give a quick overview of how to compose component hierarchies using the PEAK framework, using working code. I have inlined comments in the code example, so hopefully, it will be self explanatory.

2 Code

Here's the code example that I came up with while working out how to compose hiearchies, and "aquire" objects from parent components in PEAK. It requires the current CVS version of PEAK (0.5a3). 

    1 #file components1.py
    2 from peak.api import *
    3 
    4 SPAM_PROPERTY = PropertyName("simplecmpApp.spam")
    5 COLOR_PROPERTY = PropertyName("simplecmpApp.color")
    6 EGGS_PROPERTY = PropertyName("simplecmpApp.eggs")
    7 
    8 
    9 #------------------------------------------------------------
   10 class ISpam(protocols.Interface):
   11     """Spam interface"""
   12     def spam():
   13         """provide spam"""
   14 
   15 class Spam(binding.Component):
   16     protocols.advise(instancesProvide=[ISpam])
   17     def spam(self):
   18         return "spam"
   19 
   20 #------------------------------------------------------------
   21 class IEggs(protocols.Interface):
   22     """Eggs interface"""
   23     def eggs():
   24         """provide eggs"""
   25 
   26 class Eggs(binding.Component):
   27     protocols.advise(instancesProvide=[IEggs])
   28     def eggs(self):
   29         return "eggs"
   30 
   31 class OtherEggs(binding.Component):
   32     protocols.advise(instancesProvide=[IEggs])
   33     def eggs(self):
   34         return "othereggs"
   35 
   36 
   37 #------------------------------------------------------------
   38 class GrandChildCmp(binding.Component):
   39     #acquired from SimpleCmp
   40     gcSpam = binding.Obtain(SPAM_PROPERTY)
   41     gcColor = binding.Obtain(COLOR_PROPERTY)
   42     gcEggs = binding.Obtain(EGGS_PROPERTY)
   43     #acquired from ChildCmp
   44     gcOtherEggs = binding.Obtain(IEggs)
   45     #acquired from SimpleCmp
   46     gcStr = binding.Obtain("sc_string")
   47 
   48 class ChildCmp(binding.Component):
   49     #acquired from SimpleCmp
   50     cSpam = binding.Obtain(ISpam)
   51     cStr = binding.Obtain("sc_string")
   52     #overrides IEggs provided by SimpleCmp
   53     cEggs = binding.Obtain(IEggs)
   54     __eggs = binding.Make(OtherEggs, offerAs=[IEggs])
   55 
   56     #make a GrandChild child of this component
   57     grandChild = binding.Make(GrandChildCmp)
   58 
   59 class SimpleCmp(binding.Component):
   60     #simple component variable. Child components can look up directly by name
   61     sc_string = "simple-c!"
   62     #__eggs and __spam are registered as Interfaces and properties
   63     #They can be bound either using binding.Obtain(<InterfaceName>)
   64     #or binding.Obtain(PropertyName(<property.name>))
   65     __eggs = binding.Make(Eggs, offerAs=[IEggs, EGGS_PROPERTY])
   66     __spam = binding.Make(Spam, offerAs=[ISpam, SPAM_PROPERTY])
   67     #__color is a Constant bound to a property
   68     __color = binding.Make(lambda:"red", offerAs=[COLOR_PROPERTY])
   69 
   70     #make a ChildCmp child of this component
   71     child = binding.Make(ChildCmp)
   72 
   73 #------------------------------------------------------------
   74 if __name__ == "__main__":
   75 
   76     sc = SimpleCmp()
   77     c = sc.child
   78     gc = c.grandChild
   79 
   80 
   81     print "c.eggs: ",c.cEggs.eggs()
   82     print "c.spam: ",c.cSpam.spam()
   83     print "c.cStr: ",c.cStr
   84     print "gc.spam: ",gc.gcSpam.spam()
   85     print "gc.eggs: ",gc.gcEggs.eggs()
   86     print "gcOther.eggs: ",gc.gcOtherEggs.eggs()
   87     print "gc.myColor: ",gc.gcColor
   88     print "gc.gcStr: ",gc.gcStr
   89     print "done"
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ERROR: EOF in multi-line statement

3 Running the example

Running this example should produce output similar to below: 
[joel@banzai playground1]$ python components1.py 
c.eggs:  othereggs 
c.spam:  spam 
c.cStr:  simple-c! 
gc.spam:  spam 
gc.eggs:  eggs 
gcOther.eggs:  othereggs 
gc.myColor:  red 
gc.gcStr:  simple-c! 
done

--Joel Boehland

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