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import { expect } from 'chai';
import { expectInstantly, expectNever, expectTimelyIn } from '../timing.common-spec';
import { ICriticalSection, CriticalSection } from './CriticalSection';
describe('CriticalSection', () => {
const INTENTIONAL_EXCEPTION_MESSAGE = 'Intentional exception';
let criticalSection: ICriticalSection = new CriticalSection();
beforeEach(() => {
criticalSection = new CriticalSection();
});
it('Contention', async () => {
const COUNT = 20;
const actions: Promise<void>[] = [];
for (let i = 0; i < COUNT; i++) {
actions.push(criticalSection.do(() => {}));
}
await expectInstantly(Promise.all(actions));
});
it('do() must await returned Promise', async () => {
await expectInstantly(expect(criticalSection.do(() => {
return Promise.resolve(42);
})).to.eventually.equal(42));
await expectInstantly(expect(criticalSection.do(async () => {
return 42;
})).to.eventually.equal(42));
await expectInstantly(expect(criticalSection.do(async () => {
return Promise.resolve(42);
})).to.eventually.equal(42));
});
it('Endless contention => nobody else may enter', async () => {
// No await
criticalSection.do(async () => {
return new Promise(() => {
// Never resolve
});
});
await expectNever(criticalSection.do(() => {
// Just implictly return and do nothing
}));
});
it('Exceptions lead to rejection of do() promise', async () => {
const COUNT = 20;
for (let i = 0; i < COUNT; i++) {
await expect(criticalSection.do(() => {
throw new Error(INTENTIONAL_EXCEPTION_MESSAGE);
})).to.eventually.be.rejectedWith(INTENTIONAL_EXCEPTION_MESSAGE);
}
});
it('Rejecting promises lead to rejection of do() promise', async () => {
const COUNT = 20;
for (let i = 0; i < COUNT; i++) {
await expect(criticalSection.do(async () => {
return Promise.reject(INTENTIONAL_EXCEPTION_MESSAGE);
})).to.eventually.be.rejectedWith(INTENTIONAL_EXCEPTION_MESSAGE);
}
});
it('Exception in critical section must free it again', async () => {
await expect(criticalSection.do(() => {
throw new Error(INTENTIONAL_EXCEPTION_MESSAGE);
})).to.eventually.be.rejectedWith(INTENTIONAL_EXCEPTION_MESSAGE);
await expectInstantly(criticalSection.do(() => {}));
});
it('Rejecting promise in critical section must free it again', async () => {
await expect(criticalSection.do(async () => {
return Promise.reject(INTENTIONAL_EXCEPTION_MESSAGE);
})).to.eventually.be.rejectedWith(INTENTIONAL_EXCEPTION_MESSAGE);
await expectInstantly(criticalSection.do(() => {}));
});
it('Must not be reentrant', async () => {
const NEVER_TIMEOUT = 100;
await expectTimelyIn(expect(criticalSection.do(async () => {
await expectNever(criticalSection.do(() => {
// Do nothing
}), NEVER_TIMEOUT);
return 42;
})).to.eventually.equal(42), NEVER_TIMEOUT);
});
it('CriticalSection.for returns a valid CriticalSection for objects and\
keeps returning the same on the same objects', async () => {
const dummyObjects: Object[] = [
// "Classical" Objects
{}, [], Number, String,
// More advanced prototypes
Object.prototype, Number.prototype, String.prototype,
// Functions
() => {}, setTimeout,
// Property descriptors (shall be equivalent to "normal" objects)
Object.getOwnPropertyDescriptor(
Object.defineProperty({}, 'testProp', {
configurable: false,
enumerable: false,
writable: false,
value: 42
}),
'testProp'
) as PropertyDescriptor,
// The class, its prototype and the sections for them themselves
CriticalSection, CriticalSection.prototype,
CriticalSection.for(CriticalSection), CriticalSection.for(CriticalSection.prototype)
];
const initialCriticalSections: ICriticalSection[] = [];
for (const dummyObject of dummyObjects) {
const section = CriticalSection.for(dummyObject);
initialCriticalSections.push(section);
await expectNever(section.do(async () => {
return new Promise(() => {
// Do not resolve
});
}));
}
for (let i = 0; i < dummyObjects.length; i++) {
expect(CriticalSection.for(dummyObjects[i])).to.equal(initialCriticalSections[i]);
}
});
it('CriticalSection.for throws on primitive types', async () => {
const primitiveValues: any[] = [
// Primitive values as per
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures
true, false,
null,
undefined,
1, 2, 3, 42.5, NaN, Infinity, -Infinity,
'Hello World!',
Symbol('a symbol')
];
for (const primitiveValue of primitiveValues) {
expect(() => CriticalSection.for(primitiveValue)).to.throw(TypeError);
}
});
it('CriticalSection.for returns distinct CriticalSections for multiple {}, []', () => {
expect(CriticalSection.for({})).to.not.equal(CriticalSection.for({}));
expect(CriticalSection.for([])).to.not.equal(CriticalSection.for([]));
});
it('CriticalSection.for returns identical CriticalSections for the same object', () => {
expect(CriticalSection.for(Object.prototype)).to.not.equal(CriticalSection.for([]));
});
it('CriticalSection.for returns distinct CriticalSections on the prototype chain', () => {
const prototypeObj = {};
expect(CriticalSection.for(prototypeObj)).to.be.instanceof(CriticalSection);
const obj = Object.create(prototypeObj);
expect(CriticalSection.for(obj)).to.not.equal(CriticalSection.for(prototypeObj));
});
});
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