/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 { MessageView } from '../message';
import { MessageQueue } from '../route';
import { ConsumeResult } from './ConsumeResult';
import { FilterExpression } from './FilterExpression';
import type { PushConsumer } from './PushConsumer';
export declare class ProcessQueue {
    #private;
    constructor(consumer: PushConsumer, mq: MessageQueue, filterExpression: FilterExpression);
    getMessageQueue(): MessageQueue;
    drop(): void;
    expired(): boolean;
    cacheMessages(messageList: MessageView[]): void;
    fetchMessageImmediately(): void;
    onReceiveMessageException(t: Error, attemptId?: string): void;
    receiveMessage(attemptId?: string): void;
    eraseMessage(messageView: MessageView, consumeResult: ConsumeResult): void;
    eraseFifoMessage(messageView: MessageView, consumeResult: ConsumeResult): Promise<void>;
    discardMessage(messageView: MessageView): void;
    discardFifoMessage(messageView: MessageView): void;
    cachedMessagesCount(): number;
    cachedMessageBytes(): number;
    abort(): void;
}