New - Getting new instance of queue, to be invoked during setting up application.

Block - Keeps track of single block i.e.

BlockProcessorQueue - To be interacted with before attempting to process any block It's concurrent safe.

Next - Block to be processed next, asked by sending this request & when receptor detects so, will attempt to find out what should be next processed & send that block number is response over channel specified by client.

Request - Any request to be placed into queue's channels in this form, so that client can also receive response/ confirmation over channel that they specify.

Stat - Clients can query how many blocks present in queue currently.

StatResponse - Statistics of queue to be responded back to client in this form.