@aws-cdk-testing/cli-integ
Version:
Integration tests for the AWS CDK CLI
121 lines • 12.7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ResourcePool = void 0;
const xpmutex_1 = require("./xpmutex");
/**
* A class that holds a pool of resources and gives them out and returns them on-demand
*
* The resources will be given out front to back, when they are returned
* the most recently returned version will be given out again (for best
* cache coherency).
*
* If there are multiple consumers waiting for a resource, consumers are serviced
* in FIFO order for most fairness.
*/
class ResourcePool {
pool;
static withResources(name, resources) {
const pool = xpmutex_1.XpMutexPool.fromName(name);
return new ResourcePool(pool, resources);
}
resources;
mutexes = {};
locks = {};
constructor(pool, resources) {
this.pool = pool;
if (resources.length === 0) {
throw new Error('Must have at least one resource in the pool');
}
// Shuffle to reduce contention
resources = [...resources];
fisherYatesShuffle(resources);
this.resources = resources;
for (const res of resources) {
this.mutexes[res] = this.pool.mutex(res);
}
}
/**
* Take one value from the resource pool
*
* If no such value is currently available, wait until it is.
*/
async take() {
while (true) {
// Start a wait on the unlock now -- if the unlock signal comes after
// we try to acquire but before we start the wait, we might miss it.
//
// (The timeout is in case the unlock signal doesn't come for whatever reason).
const wait = this.pool.awaitUnlock(10_000);
// Try all mutexes, we might need to reacquire an expired lock
for (const res of this.resources) {
const lease = await this.tryObtainLease(res);
if (lease) {
// Ignore the wait (count as handled)
wait.then(() => {
}, () => {
});
return lease;
}
}
// None available, wait until one gets unlocked then try again
await wait;
}
}
/**
* Execute a block using a single resource from the pool
*/
async using(block) {
const lease = await this.take();
try {
return await block(lease.value);
}
finally {
await lease.dispose();
}
}
async tryObtainLease(value) {
const lock = await this.mutexes[value].tryAcquire();
if (!lock) {
return undefined;
}
this.locks[value] = lock;
return this.makeLease(value);
}
makeLease(value) {
let disposed = false;
return {
value,
dispose: async () => {
if (disposed) {
throw new Error('Calling dispose() on an already-disposed lease.');
}
disposed = true;
return this.returnValue(value);
},
};
}
/**
* When a value is returned:
*
* - If someone's waiting for it, give it to them
* - Otherwise put it back into the pool
*/
async returnValue(value) {
const lock = this.locks[value];
delete this.locks[value];
await lock?.release();
}
}
exports.ResourcePool = ResourcePool;
/**
* Shuffle an array in-place
*/
function fisherYatesShuffle(xs) {
for (let i = xs.length - 1; i >= 1; i--) {
const j = Math.floor(Math.random() * i);
const h = xs[j];
xs[j] = xs[i];
xs[i] = h;
}
}
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type { ILock, XpMutex } from './xpmutex';\nimport { XpMutexPool } from './xpmutex';\n\n/**\n * A class that holds a pool of resources and gives them out and returns them on-demand\n *\n * The resources will be given out front to back, when they are returned\n * the most recently returned version will be given out again (for best\n * cache coherency).\n *\n * If there are multiple consumers waiting for a resource, consumers are serviced\n * in FIFO order for most fairness.\n */\nexport class ResourcePool<A extends string=string> {\n  public static withResources<A extends string>(name: string, resources: A[]) {\n    const pool = XpMutexPool.fromName(name);\n    return new ResourcePool(pool, resources);\n  }\n\n  private readonly resources: ReadonlyArray<A>;\n  private readonly mutexes: Record<string, XpMutex> = {};\n  private readonly locks: Record<string, ILock | undefined> = {};\n\n  private constructor(private readonly pool: XpMutexPool, resources: A[]) {\n    if (resources.length === 0) {\n      throw new Error('Must have at least one resource in the pool');\n    }\n\n    // Shuffle to reduce contention\n    resources = [...resources];\n    fisherYatesShuffle(resources);\n    this.resources = resources;\n\n    for (const res of resources) {\n      this.mutexes[res] = this.pool.mutex(res);\n    }\n  }\n\n  /**\n   * Take one value from the resource pool\n   *\n   * If no such value is currently available, wait until it is.\n   */\n  public async take(): Promise<ILease<A>> {\n    while (true) {\n      // Start a wait on the unlock now -- if the unlock signal comes after\n      // we try to acquire but before we start the wait, we might miss it.\n      //\n      // (The timeout is in case the unlock signal doesn't come for whatever reason).\n      const wait = this.pool.awaitUnlock(10_000);\n\n      // Try all mutexes, we might need to reacquire an expired lock\n      for (const res of this.resources) {\n        const lease = await this.tryObtainLease(res);\n        if (lease) {\n          // Ignore the wait (count as handled)\n          wait.then(() => {\n          }, () => {\n          });\n          return lease;\n        }\n      }\n\n      // None available, wait until one gets unlocked then try again\n      await wait;\n    }\n  }\n\n  /**\n   * Execute a block using a single resource from the pool\n   */\n  public async using<B>(block: (x: A) => B | Promise<B>): Promise<B> {\n    const lease = await this.take();\n    try {\n      return await block(lease.value);\n    } finally {\n      await lease.dispose();\n    }\n  }\n\n  private async tryObtainLease(value: A) {\n    const lock = await this.mutexes[value].tryAcquire();\n    if (!lock) {\n      return undefined;\n    }\n\n    this.locks[value] = lock;\n    return this.makeLease(value);\n  }\n\n  private makeLease(value: A): ILease<A> {\n    let disposed = false;\n    return {\n      value,\n      dispose: async () => {\n        if (disposed) {\n          throw new Error('Calling dispose() on an already-disposed lease.');\n        }\n        disposed = true;\n        return this.returnValue(value);\n      },\n    };\n  }\n\n  /**\n   * When a value is returned:\n   *\n   * - If someone's waiting for it, give it to them\n   * - Otherwise put it back into the pool\n   */\n  private async returnValue(value: string) {\n    const lock = this.locks[value];\n    delete this.locks[value];\n    await lock?.release();\n  }\n}\n\n/**\n * A single value taken from the pool\n */\nexport interface ILease<A> {\n  /**\n   * The value obtained by the lease\n   */\n  readonly value: A;\n\n  /**\n   * Return the leased value to the pool\n   */\n  dispose(): Promise<void>;\n}\n\n/**\n * Shuffle an array in-place\n */\nfunction fisherYatesShuffle<A>(xs: A[]) {\n  for (let i = xs.length - 1; i >= 1; i--) {\n    const j = Math.floor(Math.random() * i);\n    const h = xs[j];\n    xs[j] = xs[i];\n    xs[i] = h;\n  }\n}\n"]}