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/*
 * 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.
 */

package org.apache.flink.streaming.runtime.tasks;

import org.apache.flink.metrics.Gauge;
import org.apache.flink.streaming.api.operators.Output;
import org.apache.flink.streaming.runtime.metrics.WatermarkGauge;

import java.io.Closeable;

/**
 * An {@link Output} that measures the last emitted watermark with a {@link WatermarkGauge}.
 *
 * @param  The type of the elements that can be emitted.
 */
public interface WatermarkGaugeExposingOutput extends Output, Closeable {
    Gauge getWatermarkGauge();
}