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parallel.test.ts
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parallel.test.ts
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/*
* Copyright 2020 The Backstage Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import os from 'os';
import {
parseParallelismOption,
getEnvironmentParallelism,
runParallelWorkers,
runWorkerQueueThreads,
runWorkerThreads,
} from './parallel';
const defaultParallelism = Math.ceil(os.cpus().length / 2);
describe('parseParallelismOption', () => {
it('coerces false no parallelism', () => {
expect(parseParallelismOption(false)).toBe(1);
expect(parseParallelismOption('false')).toBe(1);
});
it('coerces true or undefined to default parallelism', () => {
expect(parseParallelismOption(true)).toBe(defaultParallelism);
expect(parseParallelismOption('true')).toBe(defaultParallelism);
expect(parseParallelismOption(undefined)).toBe(defaultParallelism);
expect(parseParallelismOption(null)).toBe(defaultParallelism);
});
it('coerces number string to number', () => {
expect(parseParallelismOption('2')).toBe(2);
});
it.each([['on'], [2.5], ['2.5']])('throws error for %p', value => {
expect(() => parseParallelismOption(value as any)).toThrow(
`Parallel option value '${value}' is not a boolean or integer`,
);
});
});
describe('getEnvironmentParallelism', () => {
it('reads the parallelism setting from the environment', () => {
process.env.BACKSTAGE_CLI_BUILD_PARALLEL = '2';
expect(getEnvironmentParallelism()).toBe(2);
process.env.BACKSTAGE_CLI_BUILD_PARALLEL = 'true';
expect(getEnvironmentParallelism()).toBe(defaultParallelism);
process.env.BACKSTAGE_CLI_BUILD_PARALLEL = 'false';
expect(getEnvironmentParallelism()).toBe(1);
delete process.env.BACKSTAGE_CLI_BUILD_PARALLEL;
expect(getEnvironmentParallelism()).toBe(defaultParallelism);
});
});
describe('runParallelWorkers', () => {
it('executes work in parallel', async () => {
const started = new Array<number>();
const done = new Array<number>();
const waiting = new Array<() => void>();
const work = runParallelWorkers({
items: [0, 1, 2, 3, 4],
parallelismSetting: 4,
parallelismFactor: 0.5, // 2 at a time
worker: async item => {
started.push(item);
await new Promise<void>(resolve => {
waiting[item] = resolve;
});
done.push(item);
},
});
await new Promise(resolve => setTimeout(resolve));
expect(started).toEqual([0, 1]);
expect(done).toEqual([]);
waiting[0]();
await new Promise(resolve => setTimeout(resolve));
expect(started).toEqual([0, 1, 2]);
expect(done).toEqual([0]);
waiting[1]();
waiting[2]();
await new Promise(resolve => setTimeout(resolve));
expect(started).toEqual([0, 1, 2, 3, 4]);
expect(done).toEqual([0, 1, 2]);
waiting[3]();
waiting[4]();
await work;
expect(done).toEqual([0, 1, 2, 3, 4]);
});
it('executes work sequentially', async () => {
const started = new Array<number>();
const done = new Array<number>();
const waiting = new Array<() => void>();
const work = runParallelWorkers({
items: [0, 1, 2, 3, 4],
parallelismFactor: 0, // 1 at a time
worker: async item => {
started.push(item);
await new Promise<void>(resolve => {
waiting[item] = resolve;
});
done.push(item);
},
});
await new Promise(resolve => setTimeout(resolve));
expect(started).toEqual([0]);
expect(done).toEqual([]);
waiting[0]();
await new Promise(resolve => setTimeout(resolve));
expect(started).toEqual([0, 1]);
expect(done).toEqual([0]);
waiting[1]();
await new Promise(resolve => setTimeout(resolve));
expect(started).toEqual([0, 1, 2]);
waiting[2]();
await new Promise(resolve => setTimeout(resolve));
expect(started).toEqual([0, 1, 2, 3]);
waiting[3]();
await new Promise(resolve => setTimeout(resolve));
expect(started).toEqual([0, 1, 2, 3, 4]);
waiting[4]();
await work;
expect(done).toEqual([0, 1, 2, 3, 4]);
});
});
describe('runWorkerQueueThreads', () => {
it('should execute work in parallel', async () => {
const sharedData = new SharedArrayBuffer(10);
const sharedView = new Uint8Array(sharedData);
const results = await runWorkerQueueThreads({
threadCount: 4,
workerData: sharedData,
items: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
workerFactory: data => {
const view = new Uint8Array(data);
return async (i: number) => {
view[i] = 10 + i;
return 20 + i;
};
},
});
expect(Array.from(sharedView)).toEqual([
10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
]);
expect(results).toEqual([20, 21, 22, 23, 24, 25, 26, 27, 28, 29]);
});
});
describe('runWorkerThreads', () => {
it('should run a single thread without items', async () => {
const [result] = await runWorkerThreads({
threadCount: 1,
workerData: 'foo',
worker: async data => `${data}bar`,
});
expect(result).toBe('foobar');
});
it('should run multiple threads without items', async () => {
const results = await runWorkerThreads({
threadCount: 4,
worker: async () => 'foo',
});
expect(results).toEqual(['foo', 'foo', 'foo', 'foo']);
});
it('should send messages', async () => {
const messages = new Array<string>();
await runWorkerThreads({
threadCount: 2,
worker: async (_data, sendMessage) => {
sendMessage('a');
await new Promise(resolve => setTimeout(resolve, 10));
sendMessage('b');
await new Promise(resolve => setTimeout(resolve, 10));
sendMessage('c');
},
onMessage: (message: string) => messages.push(message),
});
expect(messages.sort()).toEqual(['a', 'a', 'b', 'b', 'c', 'c']);
});
});