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.beam.sdk.extensions.kryo;
  
  import com.esotericsoftware.kryo.Kryo;
  import java.io.Serializable;
  
  /**
   * Interface to be implemented by clients to register their classes with {@link Kryo}.
   *
   * <p>{@link KryoRegistrar KryoRegistrars} implementations have to be stateless and {@link
   * Serializable}.
   */
  public interface KryoRegistrar extends Serializable {
  
    /**
     * Implementations should call variants of {@link Kryo#register(Class)} to register custom classes
     * with given {@link Kryo} instance. It should be stateless and resulting in the same type
     * registrations (including order of registration) every time it is called.
     *
     * @param kryo {@link Kryo} instance to be used for type registration
     */
    void registerClasses(Kryo kryo);
  }
  