[webkit-dev] A proposal for "Platform Mechanisms"

Anders Carlsson andersca at apple.com
Thu Jun 17 13:01:59 PDT 2010

On Jun 17, 2010, at 12:50 PM, Maciej Stachowiak wrote:

> On Jun 17, 2010, at 11:26 AM, Geoffrey Garen wrote:
>>> I propose that we create an abstract class, "PlatformMechanism" which acts as the starting point for accessing such functionality, something like:
>>> class PlatformMechanism {
>>>  virtual ClipboardMechanism* clipboardMechanism() = 0;
>>>  virtual FileAccessMechanism* fileAccessMechanism() = 0;
>>>  virtual PluginMechanism* pluginMechanism() = 0;
>>> };
>> I think this would read better if you just got rid of the "Mechanism" suffix. It's such an abstract word that it's maybe meaningless.
>> You might still need something to distinguish this kind of clipboard from, say, the WebCore clipboard. For that, I suggest using the word "platform."
> I agree that Mechanism is a very vague word. Platform is an interesting idea, but I believe it is potentially confusing in some ways. We have normally used platform/ to refer to stuff in the Platform directory. In fact we already have a Clipboard class in WebCore/platform, the role of which is platform abstraction of the underlying implementation. The proposed PlatformClipboard object would not primarily be providing platform abstraction, rather its main role is to provide runtime switchability among different implementations, one of which is a cross-process proxy and the other of which implements clipboard functionality directly. I don't think the name PlatformClipboard clearly identifies how the role is different from Clipboard, given the context of the project.
> Cracking my Design Patterns book (or at least my memory of it), another idea that comes up is "Strategy". Strategy is a design pattern where you have a runtime switchable object that provides alternative approaches to providing the same functionality. Then we would have:

I like Strategy, it's a bit less vague and it actually reflects the design pattern that we are using here. I'll go with that for now!

(I suppose the "PlatformMechanism" class would then become "PlatformStrategies"...)

- Anders
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