/*
 * 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.statefun.flink.core.metrics;

import java.util.Objects;
import org.apache.flink.metrics.Counter;
import org.apache.flink.metrics.MetricGroup;

public class FlinkFunctionDispatcherMetrics implements FunctionDispatcherMetrics {
  private final Counter inflightAsyncOperations;

  public FlinkFunctionDispatcherMetrics(MetricGroup operatorGroup) {
    Objects.requireNonNull(operatorGroup, "operatorGroup");

    this.inflightAsyncOperations = operatorGroup.counter("inflightAsyncOps");
  }

  @Override
  public void asyncOperationRegistered() {
    inflightAsyncOperations.inc();
  }

  @Override
  public void asyncOperationCompleted() {
    inflightAsyncOperations.dec();
  }
}