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.runners.dataflow.worker;
  
  import java.io.IOException;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.Sink;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.annotations.VisibleForTesting;
  
  /**
   * A wrapper for Sink that reports bytes buffered (or written) to {@link DataflowExecutionContext}.
   * The current use case is for {@link StreamingModeExecutionContext} to limit processing when the
   * amount of data buffered is large.
   */
  public class SizeReportingSinkWrapper<T> extends Sink<T> {
  
    private final Sink<T> underlyingSink;
    private final DataflowExecutionContext<?> executionContext;
  
    SizeReportingSinkWrapper(Sink<T> underlyingSink, DataflowExecutionContext<?> executionContext) {
      this.underlyingSink = underlyingSink;
      this.executionContext = executionContext;
    }
  
    @VisibleForTesting
    Sink<T> getUnderlyingSink() {
      return underlyingSink;
    }
  
    @Override
    public SinkWriter<T> writer() throws IOException {
      return new SizeLimitingWriterWrapper(underlyingSink.writer());
    }
  
    @Override
    public boolean supportsRestart() {
      return underlyingSink.supportsRestart();
    }
  
    class SizeLimitingWriterWrapper implements SinkWriter<T> {
      private final SinkWriter<T> underlyingWriter;
  
      SizeLimitingWriterWrapper(SinkWriter<T> underlyingSinkWriter) {
        this.underlyingWriter = underlyingSinkWriter;
      }
  
      @Override
      public long add(T value) throws IOException {
        long size = underlyingWriter.add(value);
        executionContext.reportBytesSinked(size);
        return size;
      }
  
      @Override
      public void close() throws IOException {
        underlyingWriter.close();
      }
  
      @Override
      public void abort() throws IOException {
        underlyingWriter.abort();
      }
    }
  }
  