Disable my effect if already added to layer

[Lekha29422377akpk]

I'm developing a plugin in AfterEffects sdk and I want that a user can add only one effect per layer. Not actually one effect per layer, but just one effect that I am working on. I mean if the user has other effects added, there is no issue but if my effect is added once in a layer, it should be disabled the next time from the effect menu. 
One way I can think of is to get all effects in layer, check if any of them is my effect, disable it in the effect menu. However I don't know how to disable my own effect. 
Or is there some other direct solution or outflag that I can set so that the effect can be added just once per layer?
Also I don't know how can we uniquely identify an effect. If that is possible, I might not have to disable the effect. For example, we can uniquely identify layers with their AEGP_LayerIDVal, I don't find a way to uniquely identify an effect (if the type of effect is same).

[Mylenium]

You cannot disable effects in the menus and palettes. AE auto-determines this stuff contextually  on selection states of layers and such and you have no access to these parts of the API. The effects instances and their property streams are enumerated internally, but I don't think you have access to any of that, either. That being the case perhaps you should implement some extra property that you set to a specific value you can check or rename the effect when applied. that wouldn't prevent users from renaming it otherwise, though.

Mylenium

[shachar carmi · Accepted solution]

perhaps you can remove your effect from the list using AEGP_DisableCommand, HOWEVER:

the user might duplicate or copy/paste you effect.

you can identify your effect by running through the installed effects during global setup, and storing your effect's AEGP_InstalledEffectKey by using AEGP_GetNumInstalledEffects, AEGP_GetNextInstalledEffect and AEGP_GetEffectMatchName.
then during UPDATE_PARAMS_UI (which is guaranteed to be called at some point after applying it to a layer is you have set the corresponding global setup flag), you can scan the effet's layer and check each effect's install key using AEGP_GetInstalledKeyFromLayerEffect.
now you know if 2 or more instances exist on the same layer. you can choose to alert the user, delete or turn off the redundant, or just skip the redundant's render process copying the input to the output.  

[Lekha29422377akpk]

Well thanks a lot. However what I was doing was creating a unique effectId and storing in sequence data, which gave me some issues later.

[Lekha29422377akpk]

And then this sequencedata was not the same in PF_Cmd_Render.