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291 lines
10 KiB
291 lines
10 KiB
2 years ago
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Pool = void 0;
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const Deferred_1 = require("./Deferred");
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const AggregateError_1 = require("./AggregateError");
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class Pool {
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constructor(factory) {
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this.log = false;
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if (!factory.create) {
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throw new Error('create function is required');
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}
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if (!factory.destroy) {
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throw new Error('destroy function is required');
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}
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if (!factory.validate) {
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throw new Error('validate function is required');
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}
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if (typeof factory.min !== 'number' ||
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factory.min < 0 ||
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factory.min !== Math.round(factory.min)) {
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throw new Error('min must be an integer >= 0');
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}
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if (typeof factory.max !== 'number' ||
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factory.max <= 0 ||
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factory.max !== Math.round(factory.max)) {
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throw new Error('max must be an integer > 0');
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}
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if (factory.min > factory.max) {
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throw new Error('max is smaller than min');
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}
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if (factory.maxUses !== undefined &&
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(typeof factory.maxUses !== 'number' || factory.maxUses < 0)) {
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throw new Error('maxUses must be an integer >= 0');
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}
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this.idleTimeoutMillis = factory.idleTimeoutMillis || 30000;
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this.acquireTimeoutMillis = factory.acquireTimeoutMillis || 30000;
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this.reapIntervalMillis = factory.reapIntervalMillis || 1000;
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this.maxUsesPerResource = factory.maxUses || Infinity;
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this.log = factory.log || false;
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this._factory = factory;
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this._count = 0;
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this._draining = false;
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this._pendingAcquires = [];
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this._inUseObjects = [];
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this._availableObjects = [];
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this._removeIdleScheduled = false;
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}
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get size() {
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return this._count;
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}
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get name() {
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return this._factory.name;
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}
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get available() {
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return this._availableObjects.length;
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}
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get using() {
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return this._inUseObjects.length;
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}
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get waiting() {
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return this._pendingAcquires.length;
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}
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get maxSize() {
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return this._factory.max;
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}
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get minSize() {
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return this._factory.min;
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}
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_log(message, level) {
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if (typeof this.log === 'function') {
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this.log(message, level);
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}
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else if (this.log) {
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console.log(`${level.toUpperCase()} pool ${this.name || ''} - ${message}`);
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}
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}
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_removeIdle() {
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const toRemove = [];
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const now = Date.now();
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let i;
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let available = this._availableObjects.length;
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const maxRemovable = this.size - this.minSize;
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let timeout;
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this._removeIdleScheduled = false;
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for (i = 0; i < available && maxRemovable > toRemove.length; i++) {
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timeout = this._availableObjects[i].timeout;
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if (now >= timeout) {
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this._log('removeIdle() destroying obj - now:' + now + ' timeout:' + timeout, 'verbose');
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toRemove.push(this._availableObjects[i].resource);
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}
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}
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toRemove.forEach(this.destroy, this);
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available = this._availableObjects.length;
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if (available > 0) {
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this._log('this._availableObjects.length=' + available, 'verbose');
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this._scheduleRemoveIdle();
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}
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else {
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this._log('removeIdle() all objects removed', 'verbose');
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}
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}
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_scheduleRemoveIdle() {
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if (!this._removeIdleScheduled) {
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this._removeIdleScheduled = true;
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this._removeIdleTimer = setTimeout(() => {
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this._removeIdle();
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}, this.reapIntervalMillis);
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}
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}
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_dispense() {
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let wrappedResource = null;
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const waitingCount = this._pendingAcquires.length;
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this._log(`dispense() clients=${waitingCount} available=${this._availableObjects.length}`, 'info');
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if (waitingCount < 1) {
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return;
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}
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while (this._availableObjects.length > 0) {
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this._log('dispense() - reusing obj', 'verbose');
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wrappedResource = this._availableObjects[this._availableObjects.length - 1];
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if (!this._factory.validate(wrappedResource.resource)) {
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this.destroy(wrappedResource.resource);
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continue;
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}
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this._availableObjects.pop();
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this._addResourceToInUseObjects(wrappedResource.resource, wrappedResource.useCount);
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const deferred = this._pendingAcquires.shift();
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return deferred.resolve(wrappedResource.resource);
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}
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if (this.size < this.maxSize) {
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this._createResource();
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}
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}
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_createResource() {
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this._count += 1;
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this._log(`createResource() - creating obj - count=${this.size} min=${this.minSize} max=${this.maxSize}`, 'verbose');
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this._factory
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.create()
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.then((resource) => {
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const deferred = this._pendingAcquires.shift();
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if (deferred) {
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this._addResourceToInUseObjects(resource, 0);
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deferred.resolve(resource);
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}
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else {
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this._addResourceToAvailableObjects(resource, 0);
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}
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})
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.catch((error) => {
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const deferred = this._pendingAcquires.shift();
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this._count -= 1;
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if (this._count < 0)
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this._count = 0;
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if (deferred) {
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deferred.reject(error);
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}
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process.nextTick(() => {
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this._dispense();
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});
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});
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}
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_addResourceToAvailableObjects(resource, useCount) {
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const wrappedResource = {
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resource: resource,
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useCount: useCount,
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timeout: Date.now() + this.idleTimeoutMillis,
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};
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this._availableObjects.push(wrappedResource);
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this._dispense();
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this._scheduleRemoveIdle();
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}
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_addResourceToInUseObjects(resource, useCount) {
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const wrappedResource = {
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resource: resource,
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useCount: useCount,
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};
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this._inUseObjects.push(wrappedResource);
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}
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_ensureMinimum() {
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let i, diff;
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if (!this._draining && this.size < this.minSize) {
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diff = this.minSize - this.size;
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for (i = 0; i < diff; i++) {
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this._createResource();
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}
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}
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}
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acquire() {
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if (this._draining) {
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return Promise.reject(new Error('pool is draining and cannot accept work'));
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}
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const deferred = new Deferred_1.Deferred();
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deferred.registerTimeout(this.acquireTimeoutMillis, () => {
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this._pendingAcquires = this._pendingAcquires.filter((pending) => pending !== deferred);
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});
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this._pendingAcquires.push(deferred);
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this._dispense();
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return deferred.promise();
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}
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release(resource) {
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if (this._availableObjects.some((resourceWithTimeout) => resourceWithTimeout.resource === resource)) {
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this._log('release called twice for the same resource: ' + new Error().stack, 'error');
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return;
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}
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const index = this._inUseObjects.findIndex((wrappedResource) => wrappedResource.resource === resource);
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if (index < 0) {
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this._log('attempt to release an invalid resource: ' + new Error().stack, 'error');
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return;
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}
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const wrappedResource = this._inUseObjects[index];
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wrappedResource.useCount += 1;
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if (wrappedResource.useCount >= this.maxUsesPerResource) {
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this._log('release() destroying obj - useCount:' +
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wrappedResource.useCount +
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' maxUsesPerResource:' +
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this.maxUsesPerResource, 'verbose');
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this.destroy(wrappedResource.resource);
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this._dispense();
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}
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else {
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this._inUseObjects.splice(index, 1);
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this._addResourceToAvailableObjects(wrappedResource.resource, wrappedResource.useCount);
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}
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}
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async destroy(resource) {
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const available = this._availableObjects.length;
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const using = this._inUseObjects.length;
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this._availableObjects = this._availableObjects.filter((object) => object.resource !== resource);
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this._inUseObjects = this._inUseObjects.filter((object) => object.resource !== resource);
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if (available === this._availableObjects.length &&
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using === this._inUseObjects.length) {
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this._ensureMinimum();
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return;
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}
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this._count -= 1;
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if (this._count < 0)
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this._count = 0;
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try {
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await this._factory.destroy(resource);
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}
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finally {
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this._ensureMinimum();
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if (!this._draining) {
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process.nextTick(() => {
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this._dispense();
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});
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}
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}
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}
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drain() {
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this._log('draining', 'info');
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this._draining = true;
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const check = (callback) => {
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if (this._pendingAcquires.length > 0) {
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this._dispense();
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setTimeout(() => {
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check(callback);
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}, 100);
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return;
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}
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if (this._availableObjects.length !== this._count) {
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setTimeout(() => {
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check(callback);
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}, 100);
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return;
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}
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callback();
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};
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return new Promise((resolve) => check(resolve));
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}
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async destroyAllNow() {
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this._log('force destroying all objects', 'info');
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this._removeIdleScheduled = false;
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clearTimeout(this._removeIdleTimer);
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const resources = this._availableObjects.map((resource) => resource.resource);
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const errors = [];
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for (const resource of resources) {
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try {
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await this.destroy(resource);
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}
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catch (ex) {
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this._log('Error destroying resource: ' + ex.stack, 'error');
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errors.push(ex);
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}
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}
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if (errors.length > 0) {
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throw new AggregateError_1.AggregateError(errors);
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}
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}
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}
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exports.Pool = Pool;
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//# sourceMappingURL=Pool.js.map
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