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Zeyro

Entity Component System - Accessing Components

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I'm experimenting with building an Entity Component System, and I've run into the problem of accessing components. I am currently just using a method for each individual component type and a specific typed variable. I'd like to change to something better, but I don't know what is best.

I've thought of simply searching through a dynamic list each time a component is accessed, but I'm afraid this will start to lag if there are many access calls per second (which there currently are). Also, I'm afraid a dynamic list will take longer to append and will be less memory efficient than what I have now.

I googled the question and someone suggested a hash map, which has a constant access time, but I have never used a hash map (I know :O) and after a little bit of research, I still couldn't see the benefit of using one for something like this.

So my question is, in an entity component system, what is a good way to quickly and efficiently access components?

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Since you do not describe how you are defining and using your components (other then that they are accessed through a method), it is hard to give any direct advice as how to store and access them.

 

There are many forms of entity-compoennt systems - some where an entity an object with a list of components and others where an entity is just a an id and the components are stored in seperat lists and accessed through that entity id.

 

I am personally using an approach based on the latter (where an entyity is represented by an id) since I like the simplicity and performance of that method,

I also think its very readable, but it can be a bit hard to wrap your head around initially if you are more used to the object oriented style of programming.

 

I started out by following some great articles here on gamedev:

 

http://www.gamedev.net/page/resources/_/technical/game-programming/understanding-component-entity-systems-r3013

http://www.gamedev.net/page/resources/_/technical/game-programming/implementing-component-entity-systems-r3382

http://www.gamedev.net/page/resources/_/technical/game-programming/case-study-bomberman-mechanics-in-an-entity-component-system-r3159

 

Have a look and see if that is something you could use maybe.

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