/*
 * 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.celeborn.plugin.flink.buffer;

/** Listener to be notified when there is any available credit. */
public abstract class CreditListener {

  private int numCreditsNeeded;

  private boolean isRegistered;

  void increaseNumCreditsNeeded(int numCredits) {
    numCreditsNeeded += numCredits;
  }

  void decreaseNumCreditsNeeded(int numCredits) {
    numCreditsNeeded -= numCredits;
  }

  int getNumCreditsNeeded() {
    return numCreditsNeeded;
  }

  boolean isRegistered() {
    return isRegistered;
  }

  void setRegistered(boolean registered) {
    isRegistered = registered;
  }

  public abstract void notifyAvailableCredits(int numCredits);
}
