/*
 * 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.runners.dataflow.worker.util.common.worker;

/**
 * Interface for functions invokable by {@link ParDoOperation} instances.
 *
 * <p>To easily create a {@link ParDoFn} implementation with default setup, processing, and
 * teardown, extend {@code ParDoFnBase}.
 */
public interface ParDoFn {
  void startBundle(Receiver... receivers) throws Exception;

  void processElement(Object elem) throws Exception;

  void processTimers() throws Exception;

  void finishBundle() throws Exception;

  void abort() throws Exception;
}
