/**
 * Copyright 2017-2020 Plexus Interop Deutsche Bank AG
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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 { default as Queue } from 'typescript-collections/dist/lib/Queue';
import { CancellationToken } from '../async/CancellationToken';
export declare abstract class BlockingQueue<T> {
    abstract blockingDequeue(cancellationToken?: CancellationToken): Promise<T>;
    abstract enqueue(el: T): Promise<void>;
    abstract size(): number;
    abstract clear(): void;
    abstract peek(): T;
    abstract dequeue(): T;
}
export declare class BlockingQueueBase<T> implements BlockingQueue<T> {
    private readonly internal;
    constructor(internal?: Queue<T>);
    blockingDequeue(cancellationToken?: CancellationToken): Promise<T>;
    enqueue(el: T): Promise<void>;
    size(): number;
    clear(): void;
    peek(): T;
    dequeue(): T;
}