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
   *
   * https://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.avro.file;
  
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  import org.apache.avro.Schema;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.util.RandomData;
  import org.junit.jupiter.api.Test;
  
  /*
   * Tests if we not write any garbage to the end of the file after any exception occurred
   */
  public class TestIOExceptionDuringWrite {
  
    private static class FailingOutputStream extends OutputStream {
      private int byteCnt;
  
      public FailingOutputStream(int failAfter) {
        byteCnt = failAfter;
      }
  
      @Override
      public void write(int b) throws IOException {
        if (byteCnt > 0) {
          --byteCnt;
        } else if (byteCnt == 0) {
          --byteCnt;
          throw new IOException("Artificial failure from FailingOutputStream");
        } else {
          fail("No bytes should have been written after IOException");
        }
      }
    }
  
    private static final String SCHEMA_JSON = "{\"type\": \"record\", \"name\": \"Test\", \"fields\": ["
        + "{\"name\":\"stringField\", \"type\":\"string\"}," + "{\"name\":\"longField\", \"type\":\"long\"}]}";
    private static final Schema SCHEMA = new Schema.Parser().parse(SCHEMA_JSON);
  
    @Test
    void noWritingAfterException() throws IOException {
      try (DataFileWriter<Object> writer = new DataFileWriter<>(new GenericDatumWriter<>())) {
        writer.create(SCHEMA, new FailingOutputStream(100000));
        int recordCnt = 0;
        for (Object datum : new RandomData(SCHEMA, 100000, 42)) {
          writer.append(datum);
          if (++recordCnt % 17 == 0) {
            writer.flush();
          }
        }
      } catch (IOException e) {
        return;
      }
      fail("IOException should have been thrown");
    }
  
  }
  