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design_pattern_decisions.md

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Design pattern decisions

The following patterns were implemented in the solution:

ShopKeeper

  1. Circuit breaker with activate/deactivate via the OwnerManagedLite contract
  2. Withdrawal pattern when owners take funds (allocated in a separate call)
  3. Restricting access via the OwnerManagedLite contract
  4. Small state machine for multi-sig changes to the contract owning state
  5. Shops are created via a factory (not the current EIP Factory pattern) and are accessed directly not via ShopKeeper - ShopKeeper is merely a lookup to it
  6. An initial upgradable contract was used, but was removed as I had some issues with it

Shop

  1. Circuit breaker with activate/deactivate via the OwnerManagedLite contract
  2. Withdrawal pattern when owners take funds (allocated in a separate call)
  3. Restricting access via the OwnerManagedLite contract
  4. Small state machine for multi-sig changes to the contract owning state