// Copyright (C) 2023 The Android Open Source Project
//
// 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 com.google.gerrit.k8s.operator;

import com.google.common.collect.Lists;
import com.google.inject.Singleton;
import java.util.ArrayList;
import java.util.List;

@Singleton
public class LifecycleManager {
  private List<Runnable> shutdownHooks = new ArrayList<>();

  public LifecycleManager() {
    Runtime.getRuntime().addShutdownHook(new Thread(this::executeShutdownHooks));
  }

  public void addShutdownHook(Runnable hook) {
    shutdownHooks.add(hook);
  }

  private void executeShutdownHooks() {
    for (Runnable hook : Lists.reverse(shutdownHooks)) {
      hook.run();
    }
  }
}
