52 lines
1.7 KiB
Go
52 lines
1.7 KiB
Go
package westworldwithmessaging
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import "sync"
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// minerGlobalState is the Go version of the (not yet pasted)
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// singleton class MinerGlobalState from the book. Same pattern as
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// enterMineAndDigForNugget: unexported type, one shared instance,
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// reached only through the function below. This is the state whose
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// Execute runs on every single tick, regardless of whatever else
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// the miner is currently doing (see StateMachine.Update).
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type minerGlobalState struct{}
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var (
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minerGlobalStateInstance *minerGlobalState
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minerGlobalStateOnce sync.Once
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)
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// MinerGlobalState is the Go stand-in for
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// "MinerGlobalState::Instance()".
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func MinerGlobalState() *minerGlobalState {
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minerGlobalStateOnce.Do(func() {
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minerGlobalStateInstance = &minerGlobalState{}
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})
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return minerGlobalStateInstance
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}
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var _ State[Miner] = (*minerGlobalState)(nil)
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// Enter, Execute and Exit are placeholders - the book hasn't shown
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// us this state's real methods yet. This stub exists only so
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// NewMiner can set it as the miner's global state and compile.
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func (s *minerGlobalState) Enter(m *Miner) {
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// TODO: fill in once the book shows this method's body.
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}
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func (s *minerGlobalState) Execute(m *Miner) {
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// TODO: fill in once the book shows this method's body.
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}
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func (s *minerGlobalState) Exit(m *Miner) {
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// TODO: fill in once the book shows this method's body.
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}
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// OnMessage is required now that State[T] includes it. This state
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// doesn't handle any messages yet, so false ("not handled") is the
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// correct default until the book shows otherwise.
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func (s *minerGlobalState) OnMessage(m *Miner, msg Telegram) bool {
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// TODO: fill in once the book shows this method's body.
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return false
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}
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