content: /*
   * 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);
  }
  