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.fn.data;
  
  /**
   * A receiver of streamed data that can be closed.
   *
   * <p>The close method for a {@link CloseableFnDataReceiver} must be idempotent.
   */
  public interface CloseableFnDataReceiver<T> extends FnDataReceiver<T>, AutoCloseable {
  
    /**
     * Eagerly flushes any data that is buffered in this channel.
     *
     * @deprecated to be removed once splitting/checkpointing are available in SDKs and rewinding in
     *     readers.
     * @throws Exception
     */
    @Deprecated
    void flush() throws Exception;
  
    /**
     * {@inheritDoc}.
     *
     * <p>Does nothing if this {@link CloseableFnDataReceiver} is already closed.
     */
    @Override
    void close() throws Exception;
  }
  