Examples of org.apache.flink.types.Record

org.apache.flink.types.Record
The Record represents a multi-valued data record and forms the base of the "Record API" The record is a tuple of arbitrary values. It implements a sparse tuple model, meaning that the record can contain many fields which are actually null and not represented in the record. It has internally a bitmap marking which fields are set and which are not.
For efficient data exchange, a record that is read from any source holds its data in serialized binary form. Fields are deserialized lazily upon first access. Modified fields are cached and the modifications are incorporated into the binary representation upon the next serialization or any explicit call to the {@link #updateBinaryRepresenation()} method.
IMPORTANT NOTE: Records must be used as mutable objects and be reused across user function calls in order to achieve performance. The record is a heavy-weight object, designed to minimize calls to the individual fields' serialization and deserialization methods. It holds quite a bit of state consumes a comparably large amount of memory (> 200 bytes in a 64 bit JVM) due to several pointers and arrays.
This class is NOT thread-safe!

        driverPath,
        dbUrl,
        "select * from " + sourceTable);
    jdbcInputFormat.configure(null);


    Record record = new Record();
    while (!jdbcInputFormat.reachedEnd()) {
      jdbcInputFormat.nextRecord(record);
      jdbcOutputFormat.writeRecord(record);
    }


    jdbcOutputFormat.close();
    jdbcInputFormat.close();


    jdbcInputFormat = new JDBCInputFormat(
        driverPath,
        dbUrl,
        "select * from " + targetTable);
    jdbcInputFormat.configure(null);


    int recordCount = 0;
    while (!jdbcInputFormat.reachedEnd()) {
      jdbcInputFormat.nextRecord(record);
      Assert.assertEquals(5, record.getNumFields());
      Assert.assertEquals("Field 0 should be int", IntValue.class, record.getField(0, IntValue.class).getClass());
      Assert.assertEquals("Field 1 should be String", StringValue.class, record.getField(1, StringValue.class).getClass());
      Assert.assertEquals("Field 2 should be String", StringValue.class, record.getField(2, StringValue.class).getClass());
      Assert.assertEquals("Field 3 should be float", DoubleValue.class, record.getField(3, DoubleValue.class).getClass());
      Assert.assertEquals("Field 4 should be int", IntValue.class, record.getField(4, IntValue.class).getClass());


      int[] pos = {0, 1, 2, 3, 4};
      Value[] values = {new IntValue(), new StringValue(), new StringValue(), new DoubleValue(), new IntValue()};
      Assert.assertTrue(record.equalsFields(pos, dbData[recordCount], values));


      recordCount++;
    }
    Assert.assertEquals(5, recordCount);

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  @Test(expected = IllegalArgumentException.class)
  public void testUnsupportedSQLType() {
    jdbcInputFormat = new JDBCInputFormat("org.apache.derby.jdbc.EmbeddedDriver", "jdbc:derby:memory:ebookshop", "select * from bookscontent");
    jdbcInputFormat.configure(null);
    jdbcInputFormat.nextRecord(new Record());
  }

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  }


  @Test(expected = IllegalArgumentException.class)
  public void testNotConfiguredFormatNext() {
    jdbcInputFormat = new JDBCInputFormat("org.apache.derby.jdbc.EmbeddedDriver", "jdbc:derby:memory:ebookshop", "select * from books");
    jdbcInputFormat.nextRecord(new Record());
  }

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  @Test
  public void testJDBCInputFormat() throws IOException {
    jdbcInputFormat = new JDBCInputFormat("org.apache.derby.jdbc.EmbeddedDriver", "jdbc:derby:memory:ebookshop", "select * from books");
    jdbcInputFormat.configure(null);
    Record record = new Record();
    int recordCount = 0;
    while (!jdbcInputFormat.reachedEnd()) {
      jdbcInputFormat.nextRecord(record);
      Assert.assertEquals(5, record.getNumFields());
      Assert.assertEquals("Field 0 should be int", IntValue.class, record.getField(0, IntValue.class).getClass());
      Assert.assertEquals("Field 1 should be String", StringValue.class, record.getField(1, StringValue.class).getClass());
      Assert.assertEquals("Field 2 should be String", StringValue.class, record.getField(2, StringValue.class).getClass());
      Assert.assertEquals("Field 3 should be float", DoubleValue.class, record.getField(3, DoubleValue.class).getClass());
      Assert.assertEquals("Field 4 should be int", IntValue.class, record.getField(4, IntValue.class).getClass());


      int[] pos = {0, 1, 2, 3, 4};
      Value[] values = {new IntValue(), new StringValue(), new StringValue(), new DoubleValue(), new IntValue()};
      Assert.assertTrue(record.equalsFields(pos, dbData[recordCount], values));


      recordCount++;
    }
    Assert.assertEquals(5, recordCount);

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      StringTokenizer tokenizer = new StringTokenizer(line);
      while (tokenizer.hasMoreTokens()) {
        String word = tokenizer.nextToken();
        
        // we emit a (word, 1) pair 
        collector.collect(new Record(new StringValue(word), new IntValue(1)));
      }
    }

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    private static final long serialVersionUID = 1L;
    
    @Override
    public void reduce(Iterator<Record> records, Collector<Record> out) throws Exception {
      Record element = null;
      int sum = 0;
      
      while (records.hasNext()) {
        element = records.next();
        int cnt = element.getField(1, IntValue.class).getValue();
        sum += cnt;
      }


      element.setField(1, new IntValue(sum));
      out.collect(element);
    }

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    public MockOutputGate(int index, List<Record> outList) {
      super(new JobID(), new GateID(), index);
      this.out = outList;
      this.deserializer = new AdaptiveSpanningRecordDeserializer<Record>();
      this.record = new Record();
    }

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     *   1:SHIPPRIORITY
     *   2:SUM(EXTENDEDPRICE)
     */
    @Override
    public void reduce(Iterator<Record> values, Collector<Record> out) {
      Record rec = null;
      double partExtendedPriceSum = 0;


      while (values.hasNext()) {
        rec = values.next();
        partExtendedPriceSum += rec.getField(2, DoubleValue.class).getValue();
      }


      this.extendedPrice.setValue(partExtendedPriceSum);
      rec.setField(2, this.extendedPrice);
      out.collect(rec);
    }

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    private StringValue reduceValue = new StringValue();
    private StringValue combineValue = new StringValue();


    @Override
    public void combine(Iterator<Record> records, Collector<Record> out) {
      Record record = null;
      int sum = 0;
      
      while (records.hasNext()) {
        record = records.next();
        combineValue = record.getField(1, combineValue);
        sum += Integer.parseInt(combineValue.toString());
      }
      combineValue.setValue(sum + "");
      record.setField(1, combineValue);
      out.collect(record);
    }

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      out.collect(record);
    }


    @Override
    public void reduce(Iterator<Record> records, Collector<Record> out) {
      Record record = null;
      int sum = 0;
      
      while (records.hasNext()) {
        record = records.next();
        reduceValue = record.getField(1, reduceValue);
        sum += Integer.parseInt(reduceValue.toString());
      }
      record.setField(1, new IntValue(sum));
      out.collect(record);
    }

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