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/*
 * Copyright (c) 2011-2017 Pivotal Software Inc, 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.
 * 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 reactor.core.publisher;


import reactor.util.annotation.Nullable;

/**
 * Represents a sequence of events which has an associated key.
 *
 * @param  the key type
 * @param  the value type
 */
public abstract class GroupedFlux extends Flux {

	/**
	 * Return the key of the {@link GroupedFlux}.
	 * @return the key
	 */
	@Nullable
	public abstract K key();
}