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import { Rule } from "@jonloucks/concurrency-ts/api/Rule";
import { Config, StateMachine } from "@jonloucks/concurrency-ts/api/StateMachine";
import { Transition } from "@jonloucks/concurrency-ts/api/Transition";
import { Duration, isPresent, OptionalType, RequiredType } from "@jonloucks/concurrency-ts/api/Types";
import { Waitable } from "@jonloucks/concurrency-ts/api/Waitable";
import { eventCheck, illegalCheck, initialValueCheck, presentCheck, ruleCheck, rulesCheck, stateCheck } from "@jonloucks/concurrency-ts/auxiliary/Checks";
import { Type as ConsumerType } from "@jonloucks/concurrency-ts/auxiliary/Consumer";
import { Type as PredicateType } from "@jonloucks/concurrency-ts/auxiliary/Predicate";
import { AutoClose } from "@jonloucks/contracts-ts/api/AutoClose";
import { create as createWaitable } from "./Waitable.impl";
/**
* Create a new StateMachine
*
* @return the new StateMachine
*/
export function create<T>(config: RequiredType<Config<T>>): StateMachine<T> {
return StateMachineImpl.internalCreate(config);
}
// ---- Implementation details below ----
class StateMachineImpl<S> implements StateMachine<S> {
// Statemachine.open
open(): AutoClose {
return this.#currentState.open();
}
// IsCompleted.
isCompleted(): boolean {
return this.#isCompleted;
}
// StateMachine.setState implementation
setState(event: string, state: S): boolean {
if (this.isTransitionAllowed(event, stateCheck(state))) {
this.#currentState.consume(state);
this.updateIsCompleted(state);
return true;
}
return false;
}
// StateMachine.getState implementation
getState(): S {
return this.supply();
}
// StateMachine.hasState implementation
hasState(state: S): boolean {
return this.#stateToRulesLookup.has(stateCheck(state));
}
// StateMachine.isTransitionAllowed implementation
isTransitionAllowed(event: string, state: S): boolean {
const validEvent: string = eventCheck(event);
const toState: S = stateCheck(state);
const fromState: S = this.getState();
if (this.hasState(toState) && fromState !== toState) {
const rules: Set<Rule<S>> | undefined = this.#stateToRulesLookup.get(fromState);
if (isPresent(rules) && rules.size > 0) {
return Array.from(rules).every((r) => r.canTransition(validEvent, toState));
}
return true;
}
return false;
}
// StateMachine.transition implementation
transition<R>(transition: Transition<S, R>): OptionalType<R> {
const t: Transition<S, R> = this.transitionCheck(transition);
if (this.isAllowed(t)) {
try {
return this.handleSuccess(t);
} catch (thrown) {
return this.handleError(t, thrown);
}
} else {
return this.handleFailure(t);
}
}
// StateMachine.supply implementations
supply(): S {
return this.#currentState.supply();
}
// StateMachine.supplyIf implementation
supplyIf(predicate: PredicateType<S>): OptionalType<S> {
return this.#currentState.supplyIf(predicate);
}
// StateMachine.supplyWhen implementation
async supplyWhen(predicate: RequiredType<PredicateType<S>>, timeout?: Duration): Promise<S> {
return this.#currentState.supplyWhen(predicate, timeout);
}
// StateMachine.notifyWhile implementation
notifyWhile(predicate: RequiredType<PredicateType<S>>, listener: RequiredType<ConsumerType<S>>): RequiredType<AutoClose> {
return this.#currentState.notifyWhile(predicate, listener);
}
static internalCreate<T>(config: Config<T>): StateMachine<T> {
return new StateMachineImpl<T>(config);
}
private addStateAndRules(state: S, rules: readonly Rule<S>[]): void {
const validState = stateCheck(state);
const validRules = rulesCheck(rules);
const knownRules = this.getStateRules(validState);
validRules.forEach(rule => knownRules.add(ruleCheck(rule)));
}
private getStateRules(state: S): Set<Rule<S>> {
if (!this.#stateToRulesLookup.has(state)) {
this.#stateToRulesLookup.set(state, new Set<Rule<S>>());
}
return this.#stateToRulesLookup.get(state)!;
}
private transitionCheck<R>(transition: Transition<S, R>): Transition<S, R> {
const validTransition: Transition<S, R> = presentCheck(transition, "Transition must be present.");
this.existsCheck(validTransition.successState);
eventCheck(validTransition.event);
return validTransition;
}
private isAllowed<R>(transition: Transition<S, R>): boolean {
return this.isTransitionAllowed(transition.event, transition.successState);
}
private handleSuccess<R>(transition: Transition<S, R>): OptionalType<R> {
const value: OptionalType<R> = transition.getSuccessValue?.();
this.setState(transition.event, transition.successState);
return value;
}
private handleFailure<R>(transition: Transition<S, R>): R {
this.setOptionalState(transition.failedState, transition.event);
const value: OptionalType<R> = transition.getFailedValue?.();
if (isPresent(value)) {
return value;
} else {
throw new ConcurrencyException("Illegal state transition from " + String(this.getState()) +
" to " + String(transition.successState) + ".");
}
}
private handleError<R>(transition: Transition<S, R>, thrown: unknown): R {
this.setOptionalState(transition.errorState, transition.event);
const value: OptionalType<R> = transition.getErrorValue?.();
if (isPresent(value)) {
return value;
} else {
throw ConcurrencyException.rethrow(thrown);
}
}
private setOptionalState(optional: OptionalType<S>, event: string): void {
if (isPresent(optional)) {
this.setState(event, optional);
}
}
private existsCheck(state: S): S {
const validState = stateCheck(state);
return illegalCheck(validState, !this.hasState(validState), "State must be known.");
}
private updateIsCompleted(state: S): void {
const rules: Set<Rule<S>> | undefined = this.#stateToRulesLookup.get(state);
if (isPresent(rules) && rules.size > 0) {
for (const rule of rules) {
if (rule.isTerminal) {
this.#isCompleted = true;
return;
}
}
}
}
private constructor(config: Config<S>) {
const validConfig: Config<S> = config ?? {};
const initialState: S = initialValueCheck(validConfig.initialValue);
this.#currentState = createWaitable<S>({ initialValue: initialState });
this.addStateAndRules(initialState, []);
Eif (isPresent(validConfig.states) && validConfig.states.length > 0) {
validConfig.states.forEach(state => {
this.addStateAndRules(state, validConfig.getStateRules?.(state) ?? []);
});
}
}
readonly #stateToRulesLookup: Map<S, Set<Rule<S>>> = new Map<S, Set<Rule<S>>>();
readonly #currentState: Waitable<S>;
#isCompleted: boolean = false;
}; |