Trying to figure out projection semantics

MultiProjections.cs

void Main()
{

  dynamic processor = null;



  bool stopRequested;
	while(!stopRequested)
	{
		var checkpoint = 0;
		if (chekpoint = 0)
		{
			processor.Clear();
		}
		foreach (var e in processor.ReadEvents(checkpoint, 1000))
		{
			
		}
	
	}
	
}

public interface IEventStore
{
	
}

public interface IRawKeyValueStore
{
	void Put(string bucket, string id, byte[] data);
	void Update(string bucket, string id, Func<byte[],byte[]> update);
	void Delete(string bucket, string id);
	byte[] TryGet(string bucket, string id);
}

public interface IRawListStore
{
	void Append(string bucket, IEnumerable<KeyValuePair<string,byte[]>> records);	
	void Compact(string bucket);
	void Delete(string bucket);
}


sealed class MyProjection : IProjection
{
	IEventStore events;
	IDocumentStore docs;
	
	public long ProcessNext(long checkpoint)
	{
		if (checkpoint == 0)
		{
			docs.CreateBucket(ProjectionName);
		}
		// no batching now
		var es = store.ReadAll(checkpoint, 1);
		if (es.Count > 0)
		{
			this.When(es[0]);
			return es.Checkpoint;
		}
		return checkpoint;		
	}
	
	public void When(AccountCreated e)
	{
		docs.Put(ProjectionName, e.AccountId, new AccountView());
	}
	public void When(AccountRenamed e)
	{
		docs.Update(ProjectionName, e.AccountId, a => a.Name = e.Name);
	}	
	
	
	public string ProjectionName { get { return "my-projection"; } }
	
	void Clear()
	{
		docs.ClearBucket(ProjectionName);
	}
}

public interface IProjection
{
	void Clear();
	long ProcessNext(long checkpoint);
	string ProjectionName { get; }
}

// Define other methods and classes here