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.kafka.streams.integration.utils;
  
  import org.apache.kafka.streams.KafkaStreams.State;
  import org.apache.kafka.streams.KafkaStreams.StateListener;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.List;
  
  /**
   * A {@link StateListener} that holds zero or more listeners internally and invokes all of them
   * when a state transition occurs (i.e. {@link #onChange(State, State)} is called). If any listener
   * throws {@link RuntimeException} or {@link Error} this immediately stops execution of listeners
   * and causes the thrown exception to be raised.
   */
  public class CompositeStateListener implements StateListener {
      private final List<StateListener> listeners;
  
      public CompositeStateListener(final StateListener... listeners) {
          this(Arrays.asList(listeners));
      }
  
      public CompositeStateListener(final Collection<StateListener> stateListeners) {
          this.listeners = List.copyOf(stateListeners);
      }
  
      @Override
      public void onChange(final State newState, final State oldState) {
          for (final StateListener listener : listeners) {
              listener.onChange(newState, oldState);
          }
      }
  }
  