/**
 * Copyright (c) 2013-2024 Nikita Koksharov
 *
 * 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.
 */
package org.redisson.api;

import java.util.concurrent.CompletionStage;

/**
 * Asynchronous iterator
 *
 * @author Nikita Koksharov
 *
 * @param <V> value type
 */
public interface AsyncIterator<V> {

    /**
     * Returns <code>true</code> if more elements are available.
     * <p>
     * NOTE: each invocation returns a new instance of CompletionStage
     *
     * @return <code>true</code> if more elements are available, otherwise <code>false</code>
     */
    CompletionStage<Boolean> hasNext();

    /**
     * Returns next element or NoSuchElementException if no more elements available.
     * <p>
     * NOTE: each invocation returns a new instance of CompletionStage
     *
     * @return next element or NoSuchElementException
     */
    CompletionStage<V> next();

}
