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!

        
        distinctWords.add(new StringValue(word));
        ++numWords;
        
        // we emit a (word, 1) pair 
        collector.collect(new Record(new StringValue(word), new IntValue(1)));
      }
      
      // Add a value to the histogram accumulator
      this.wordsPerLine.add(numWords);
    }

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    private final IntValue cnt = new IntValue();


    @Override
    public void reduce(Iterator<Record> records, Collector<Record> out) {
      Record element = null;
      int sum = 0;
      while (records.hasNext()) {
        element = records.next();
        IntValue i = element.getField(1, IntValue.class);
        sum += i.getValue();
      }


      this.cnt.setValue(sum);
      element.setField(1, this.cnt);
      out.collect(element);
    }

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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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    MutableObjectIterator<Record> iterator = merger.getIterator();
    
    LOG.debug("Checking results...");
    int pairsEmitted = 1;


    Record rec1 = new Record();
    Record rec2 = new Record();
    
    Assert.assertTrue((rec1 = iterator.next(rec1)) != null);
    while ((rec2 = iterator.next(rec2)) != null) {
      final Key k1 = rec1.getField(0, TestData.Key.class);
      final Key k2 = rec2.getField(0, TestData.Key.class);
      pairsEmitted++;
      
      Assert.assertTrue(keyComparator.compare(k1, k2) <= 0); 
      
      Record tmp = rec1;
      rec1 = rec2;
      k1.setKey(k2.getKey());
      
      rec2 = tmp;
    }

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    MutableObjectIterator<Record> iterator = merger.getIterator();
    
    LOG.debug("Checking results...");
    int pairsEmitted = 1;


    Record rec1 = new Record();
    Record rec2 = new Record();
    
    Assert.assertTrue((rec1 = iterator.next(rec1)) != null);
    while ((rec2 = iterator.next(rec2)) != null) {
      final Key k1 = rec1.getField(0, TestData.Key.class);
      final Key k2 = rec2.getField(0, TestData.Key.class);
      pairsEmitted++;
      
      Assert.assertTrue(keyComparator.compare(k1, k2) <= 0); 
      
      Record tmp = rec1;
      rec1 = rec2;
      k1.setKey(k2.getKey());
      
      rec2 = tmp;
    }

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    MutableObjectIterator<Record> iterator = merger.getIterator();
    
    LOG.debug("Checking results...");
    int pairsEmitted = 1;


    Record rec1 = new Record();
    Record rec2 = new Record();
    
    Assert.assertTrue((rec1 = iterator.next(rec1)) != null);
    while ((rec2 = iterator.next(rec2)) != null) {
      final Key k1 = rec1.getField(0, TestData.Key.class);
      final Key k2 = rec2.getField(0, TestData.Key.class);
      pairsEmitted++;
      
      Assert.assertTrue(keyComparator.compare(k1, k2) <= 0); 
      
      Record tmp = rec1;
      rec1 = rec2;
      k1.setKey(k2.getKey());
      
      rec2 = tmp;
    }

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    LOG.debug("Checking results...");
    int pairsRead = 1;
    int nextStep = PAIRS / 20;


    Record rec1 = new Record();
    Record rec2 = new Record();
    
    Assert.assertTrue((rec1 = iterator.next(rec1)) != null);
    while ((rec2 = iterator.next(rec2)) != null) {
      final Key k1 = rec1.getField(0, TestData.Key.class);
      final Key k2 = rec2.getField(0, TestData.Key.class);
      pairsRead++;
      
      Assert.assertTrue(keyComparator.compare(k1, k2) <= 0); 
      
      Record tmp = rec1;
      rec1 = rec2;
      k1.setKey(k2.getKey());
      rec2 = tmp;
      
      // log

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  private Map<TestData.Key, Collection<TestData.Value>> collectData(MutableObjectIterator<Record> iter)
  throws Exception
  {
    Map<TestData.Key, Collection<TestData.Value>> map = new HashMap<TestData.Key, Collection<TestData.Value>>();
    Record pair = new Record();
    
    while ((pair = iter.next(pair)) != null) {
      TestData.Key key = pair.getField(0, TestData.Key.class);
      
      if (!map.containsKey(key)) {
        map.put(new TestData.Key(key.getKey()), new ArrayList<TestData.Value>());
      }


      Collection<TestData.Value> values = map.get(key);
      values.add(new TestData.Value(pair.getField(1, TestData.Value.class).getValue()));
    }


    return map;
  }

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    this.memman = new DefaultMemoryManager(MEMORY_CAPACITY, 1);
    
    // create test objects
    this.objects = new ArrayList<Record>(20000);
    for (int i = 0; i < NUM_VALUES; ++i) {
      this.objects.add(new Record(new IntValue(i)));
    }
    
    // create the reader
    this.reader = new MutableObjectIteratorWrapper(this.objects.iterator());
  }

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