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import { AutoOpen } from "@jonloucks/contracts-ts/api/AutoOpen";
import { BindStrategy, BindStrategyType, resolveBindStrategy } from "@jonloucks/contracts-ts/api/BindStrategy";
import { Contract } from "@jonloucks/contracts-ts/api/Contract";
import { ContractException } from "@jonloucks/contracts-ts/api/ContractException";
import { Config, Contracts } from "@jonloucks/contracts-ts/api/Contracts";
import { Promisor, PromisorType, typeToPromisor } from "@jonloucks/contracts-ts/api/Promisor";
import { OptionalType, RequiredType, isPresent } from "@jonloucks/contracts-ts/api/Types";
import { configCheck, contractCheck, presentCheck } from "@jonloucks/contracts-ts/auxiliary/Checks";
import { Idempotent } from "@jonloucks/contracts-ts/auxiliary/Idempotent";
import { AtomicBoolean } from "@jonloucks/contracts-ts/auxiliary/AtomicBoolean";
import { AutoCloseMany, create as createAutoCloseMany } from "./AutoCloseMany.impl";
import { create as createIdempotent } from "./Idempotent.impl";
import { create as createAtomicBoolean } from "./AtomicBoolean.impl";
import { Events, create as createEvents } from "./Events.impl";
import { Internal } from "./Internal.impl";
import { Policy, create as createPolicy } from "./Policy.impl";
/**
* Factory method to create Contracts instance.
*
* @param config the configuration for the Contracts instance
* @returns the Contracts implementation
*/
export function create(config: Config): RequiredType<Contracts> {
return ContractsImpl.internalCreate(config);
}
// ---- Implementation details below ----
/**
* Contracts implementation.
*/
class ContractsImpl implements Contracts, AutoOpen {
/**
* AutoOpen.autoOpen override.
*/
autoOpen(): AutoClose {
return this.open();
}
/**
* Open.open override.
*/
open(): AutoClose {
return this.#idempotent.open();
}
/**
* Contracts.claim override.
*/
claim<T>(contract: Contract<T>): OptionalType<T> {
const validContract: Contract<T> = contractCheck(contract);
this.#policy.checkContract(validContract);
const promisor: OptionalType<Promisor<T>> = this.getFromPromisorMap(validContract);
if (isPresent(promisor)) {
return validContract.cast(promisor.demand());
} else {
return this.claimFromPartners(validContract);
}
}
/**
* Contracts.enforce override.
*/
enforce<T>(contract: Contract<T>): RequiredType<T> {
const deliverable: OptionalType<T> = this.claim(contract);
if (isPresent(deliverable)) {
return deliverable;
}
throw new ContractException("Contract " + contract + " enforcement failed: No value present.");
}
/**
* Contracts.isBound override.
*/
isBound<T>(contract: Contract<T>): boolean {
const validContract: Contract<T> = contractCheck(contract);
this.#policy.checkContract(validContract);
const promisor: OptionalType<Promisor<T>> = this.getFromPromisorMap(validContract);
return isPresent(promisor) || this.isAnyPartnerBound(contract);
}
/**
* Contracts.bind override.
*/
bind<T>(contract: Contract<T>, promisor: PromisorType<T>, bindStrategy?: BindStrategyType): AutoClose {
const validContract: Contract<T> = contractCheck(contract);
this.#policy.checkContract(validContract);
const validPromisor: Promisor<T> = typeToPromisor<T>(promisor);
const validBindStrategy: BindStrategy = resolveBindStrategy(bindStrategy);
return this.maybeBind(validContract, validPromisor, validBindStrategy);
}
/**
* Object.toString override.
*/
toString(): string {
return `Contracts[size: ${this.#promisorMap.size}]`;
}
static internalCreate(config: Config): RequiredType<Contracts> {
return new ContractsImpl(config);
}
private firstOpen(): AutoCloseType {
this.#closeMany.add(this.#events.open());
return () => this.closeFirstOpen();
}
private closeFirstOpen(): void {
try {
this.attemptToCloseBindings();
} finally {
this.#closeMany.close();
}
}
private shutdown(): void {
this.closeFirstOpen();
}
private attemptToCloseBindings(): void {
const MAX_RETRIES = 6;
let iterations = 0;
while (this.breakAllBindings() > 0) {
iterations++;
Iif (iterations >= MAX_RETRIES) {
throw new ContractException(
`Failed to break all bindings after ${MAX_RETRIES} attempts`
);
}
}
}
private maybeBind<T>(contract: Contract<T>, newPromisor: Promisor<T>, bindStrategy: BindStrategy): AutoClose {
if (this.checkBind(contract, newPromisor, bindStrategy)) {
return this.doBind(contract, newPromisor);
} else {
return AUTO_CLOSE_NONE;
}
}
private checkBind<T>(contract: Contract<T>, newPromisor: Promisor<T>, bindStrategy: BindStrategy): boolean {
const optionalCurrent: OptionalType<Promisor<T>> = this.getFromPromisorMap(contract);
if (isPresent(optionalCurrent)) {
return this.checkReplacement(contract, newPromisor, bindStrategy, optionalCurrent);
} else {
return true;
}
}
private checkReplacement<T>(contract: Contract<T>, newPromisor: Promisor<T>, bindStrategy: BindStrategy, currentPromisor: Promisor<T>): boolean {
// Double bind of same promisor, do not rebind
// Review unwrapping if needed in future
if (currentPromisor === newPromisor) {
return false;
}
switch (bindStrategy) {
case "ALWAYS":
if (contract.replaceable) {
return true;
}
this.throwContractNotReplaceableException(contract);
case "IF_NOT_BOUND":
return false;
case "IF_ALLOWED":
default:
return contract.replaceable;
}
}
private doBind<T>(contract: Contract<T>, promisor: Promisor<T>): AutoClose {
// Since ReentrantReadWriteLock does not support lock upgrade, there are opportunities
// for changes by other threads between the reads and writes.
// This is mitigated by always incrementing the new value and decrementing the old value.
promisor.incrementUsage();
const previousPromisor: OptionalType<Promisor<T>> = this.getFromPromisorMap(contract);
this.#promisorMap.set(contract, promisor);
if (isPresent(previousPromisor)) {
previousPromisor.decrementUsage();
}
const breakBindingOnce: AtomicBoolean = createAtomicBoolean(true);
return inlineAutoClose(() => {
Eif (breakBindingOnce.compareAndSet(true, false)) {
this.breakBinding(contract, promisor);
}
});
}
private breakBinding<T>(contract: Contract<T>, promisor: Promisor<T>): void {
// it is possible the Contract has already been removed or updated with a new Promisor
// Checking the removed promisor is required to avoid:
// 1. Calling decrementUsage twice on Promisors already removed
// 2. Not calling decrementUsage enough times
// decrementing usage too many times.
try {
this.removeFromPromisorMap(contract, promisor);
} finally {
promisor.decrementUsage();
}
}
private removeFromPromisorMap<T>(contract: Contract<T>, promisor: Promisor<T>): void {
if (this.#promisorMap.get(contract) === promisor) {
this.#promisorMap.delete(contract);
}
}
private getFromPromisorMap<T>(contract: Contract<T>): OptionalType<Promisor<T>> {
return (this.#promisorMap.get(contract) as OptionalType<Promisor<T>>);
}
private breakAllBindings(): number {
let contractCount: number = 0;
Internal.mapForEachReversed(this.#promisorMap, (contract, promisor) => {
this.breakBinding(contract, promisor);
contractCount++;
});
return contractCount;
}
private hasPartners(): boolean {
return this.#partners.length > 0;
}
private claimFromPartners<T>(contract: Contract<T>): OptionalType<T> {
if (this.hasPartners()) {
for (const partner of this.#partners) {
if (partner.isBound(contract)) {
return partner.claim(contract);
}
}
}
this.throwContractNotPromisedException(contract);
}
private isAnyPartnerBound<T>(contract: Contract<T>): boolean {
if (this.hasPartners()) {
return this.#partners.some(partner => partner.isBound(contract));
}
return false;
}
private throwContractNotPromisedException<T>(contract: Contract<T>): never {
throw new ContractException("Contract " + contract + " was not promised.");
}
private throwContractNotReplaceableException<T>(contract: Contract<T>): never {
throw new ContractException("Contract " + contract + " is not replaceable.");
}
private constructor(config: Config) {
const validConfig = configCheck(config);
const validPartners = presentCheck(validConfig?.partners ?? [], "Partners must be present.");
this.#policy = createPolicy(validConfig);
this.#events = createEvents({
names: validConfig?.shutdownEvents ?? [],
callback: () => this.shutdown()
});
Eif (isPresent(validPartners)) {
this.#partners.push(...validPartners);
}
}
readonly #closeMany: AutoCloseMany = createAutoCloseMany();
readonly #idempotent: Idempotent = createIdempotent({ open: () => this.firstOpen() });
readonly #promisorMap = new Map<Contract<unknown>, Promisor<unknown>>();
readonly #partners: Contracts[] = [];
readonly #policy: Policy;
readonly #events: Events;
}
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