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Viewing file:     promisebuffer.js (2.8 KB)      -rw-r--r--

import { SentryError } from './error';
import { SyncPromise } from './syncpromise';
/** A simple queue that holds promises. */
var PromiseBuffer = /** @class */ (function () {
    function PromiseBuffer(_limit) {
        this._limit = _limit;
        /** Internal set of queued Promises */
        this._buffer = [];
    }
    /**
     * Says if the buffer is ready to take more requests
     */
    PromiseBuffer.prototype.isReady = function () {
        return this._limit === undefined || this.length() < this._limit;
    };
    /**
     * Add a promise to the queue.
     *
     * @param task Can be any PromiseLike<T>
     * @returns The original promise.
     */
    PromiseBuffer.prototype.add = function (task) {
        var _this = this;
        if (!this.isReady()) {
            return SyncPromise.reject(new SentryError('Not adding Promise due to buffer limit reached.'));
        }
        if (this._buffer.indexOf(task) === -1) {
            this._buffer.push(task);
        }
        task
            .then(function () { return _this.remove(task); })
            .then(null, function () {
            return _this.remove(task).then(null, function () {
                // We have to add this catch here otherwise we have an unhandledPromiseRejection
                // because it's a new Promise chain.
            });
        });
        return task;
    };
    /**
     * Remove a promise to the queue.
     *
     * @param task Can be any PromiseLike<T>
     * @returns Removed promise.
     */
    PromiseBuffer.prototype.remove = function (task) {
        var removedTask = this._buffer.splice(this._buffer.indexOf(task), 1)[0];
        return removedTask;
    };
    /**
     * This function returns the number of unresolved promises in the queue.
     */
    PromiseBuffer.prototype.length = function () {
        return this._buffer.length;
    };
    /**
     * This will drain the whole queue, returns true if queue is empty or drained.
     * If timeout is provided and the queue takes longer to drain, the promise still resolves but with false.
     *
     * @param timeout Number in ms to wait until it resolves with false.
     */
    PromiseBuffer.prototype.drain = function (timeout) {
        var _this = this;
        return new SyncPromise(function (resolve) {
            var capturedSetTimeout = setTimeout(function () {
                if (timeout && timeout > 0) {
                    resolve(false);
                }
            }, timeout);
            SyncPromise.all(_this._buffer)
                .then(function () {
                clearTimeout(capturedSetTimeout);
                resolve(true);
            })
                .then(null, function () {
                resolve(true);
            });
        });
    };
    return PromiseBuffer;
}());
export { PromiseBuffer };
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