/**
 * 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 { ConsumeService } from './ConsumeService';
import { MessageListener } from './MessageListener';
import type { ProcessQueue } from './ProcessQueue';
export declare class FifoConsumeService extends ConsumeService {
    #private;
    constructor(clientId: string, messageListener: MessageListener, enableFifoConsumeAccelerator?: boolean);
    consume(pq: ProcessQueue, messageViews: MessageView[]): void;
    /**
     * Get the group key for the given message view.
     * Subclasses can override this method to provide different grouping logic.
     *
     * @param messageView - The message view
     * @return {string} The group key, empty string means no grouping
     */
    protected getMessageGroupKey(messageView: MessageView): string;
    /**
     * Consume messages iteratively using the provided message view array.
     * This method handles corrupted messages and continues processing the next valid message.
     *
     * @param pq - The process queue
     * @param messageViews - The message views to consume
     * @param startIndex - The index to start consuming from
     * @return {Promise<void>} Promise that resolves when all messages are consumed
     */
    protected consumeIteratively(pq: ProcessQueue, messageViews: MessageView[], startIndex: number): Promise<void>;
    /**
     * Get the next valid message from the message view array.
     * Skip corrupted messages and return the first valid one.
     * Returns null if there are no more messages.
     *
     * @param pq - The process queue
     * @param messageViews - The message views
     * @param startIndex - The index to start searching from
     * @return {{ messageView: MessageView; nextIndex: number } | null} The next valid message and the index after it, or null
     */
    protected getNextValidMessage(pq: ProcessQueue, messageViews: MessageView[], startIndex: number): {
        messageView: MessageView;
        nextIndex: number;
    } | null;
}