Bolt-on Protocol Prototype

An example implementation and usage of the Bolt-on protocol.

Quick Start

• npm run build creates static assets
• npm start serves the assets
• npm test runs the tests

Bolt-on protocol

A Shim wraps an eventually consistent data store and adds causal consistency.

• Peter Bailis' paper
• Peter Bailis' code exmaple

SAM pattern

The app reads and writes to the Shim through a model, according to the State Action Model (SAM) pattern.

• home
• An action proposes an update and the model accepts or rejects it (ie. a defined Step).
• The model updates and view updates are clearly separated (model and state-representation).

HyperHTML with Server Side Rendering

• HyperHTML updates the DOM efficiently
• The state is a simple (Javascript) Object.
• It supports server side rendering. While the page is parsing client-side code, event handlers, for example buttons, record actions to be replayed when the client app is ready.

VS Code Launch Config

{
    "type": "node",
    "request": "launch",
    "name": "PROD Server",
    "program": "${workspaceFolder}/src/server/index.mjs",
    "runtimeArgs": ["--experimental-modules"],
    "env": {
        "NODE_ENV": "production"
    }
}

TODO

• Shim implementation
  • Pessimistic
  • Optimistic Shim
• Local Shim size in browser - reset possible?
• Co-locate Shim with:
  • browser
  • server
• App exmples:
  • Twitter-like message tree
  • Tv Shows blog post - linked data (eg. for CMS?)
  • Monitoring tool
• SAM Pattern:
  • (Optimistic) Shim updates call actions
  • Cancel actions via Shim
• Property-based tests:
  • Causal relation
  • Is-covered
• Bounded size of Shim (affects Shim performance)
• Performance optimisations for Shim
• Write Shim code in Typescript?
• Use PouchDB's change-events for Shim?
• Service provides unique Shim-IDs
• Use TypeScript