aws-crt/dist/common/event.js

NodeJS bindings to the aws-c-* libraries

"use strict";
/*
 * Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.
 */
Object.defineProperty(exports, "__esModule", { value: true });
const events_1 = require("events");
class BufferedEvent {
    constructor(event, ...args) {
        this.event = event;
        this.args = args;
    }
}
/**
 * Provides buffered event emitting semantics, similar to many Node-style streams.
 * Subclasses will override {@link BufferedEventEmitter#on} and trigger uncorking.
 * Note that uncorking should always be done next tick, not during the on() call!
 */
class BufferedEventEmitter extends events_1.EventEmitter {
    constructor() {
        super();
        this.corked = false;
    }
    cork() {
        this.corked = true;
    }
    uncork() {
        this.corked = false;
        while (this.eventQueue) {
            const event = this.eventQueue;
            super.emit(event.event, ...event.args);
            this.eventQueue = this.eventQueue.next;
        }
    }
    emit(event, ...args) {
        if (this.corked) {
            // queue requests in order
            let last = this.lastQueuedEvent;
            this.lastQueuedEvent = new BufferedEvent(event, args);
            if (last) {
                last.next = this.lastQueuedEvent;
            }
            else {
                this.eventQueue = this.lastQueuedEvent;
            }
            return this.listeners(event).length > 0;
        }
        return super.emit(event, ...args);
    }
}
exports.BufferedEventEmitter = BufferedEventEmitter;
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