@Override
public WindowedValue<T> next() throws IOException {
Windmill.Message message =
context.getWork().getMessageBundles(bundleIndex).getMessages(messageIndex);
if (messageIndex >= context.getWork().getMessageBundles(bundleIndex).getMessagesCount() - 1) {
messageIndex = 0;
bundleIndex++;
} else {
messageIndex++;
}
Instant timestampMillis = new Instant(TimeUnit.MICROSECONDS.toMillis(message.getTimestamp()));
InputStream data = message.getData().newInput();
InputStream metadata = message.getMetadata().newInput();
Collection<? extends BoundedWindow> windows =
WindmillSink.decodeMetadataWindows(windowsCoder, message.getMetadata());
PaneInfo pane = WindmillSink.decodeMetadataPane(message.getMetadata());
if (valueCoder instanceof KvCoder) {
KvCoder<?, ?> kvCoder = (KvCoder<?, ?>) valueCoder;
InputStream key = context.getSerializedKey().newInput();
notifyElementRead(key.available() + data.available() + metadata.available());
@SuppressWarnings("unchecked")
T result =
(T) KV.of(decode(kvCoder.getKeyCoder(), key), decode(kvCoder.getValueCoder(), data));
return WindowedValue.of(result, timestampMillis, windows, pane);
} else {
notifyElementRead(data.available() + metadata.available());
return WindowedValue.of(decode(valueCoder, data), timestampMillis, windows, pane);
}
}
@Test
public void testCombineValuesFnMerge() throws Exception {
TestReceiver receiver = new TestReceiver();
MeanInts mean = new MeanInts();
Combine.KeyedCombineFn<String, Integer, MeanInts.CountSum, String> combiner = mean.asKeyedFn();
ParDoFn combineParDoFn = createCombineValuesFn(CombineValuesFn.CombinePhase.MERGE, combiner);
combineParDoFn.startBundle(receiver);
combineParDoFn.processElement(
WindowedValue.valueInGlobalWindow(
KV.of(
"a",
Arrays.asList(
mean.new CountSum(3, 6), mean.new CountSum(2, 9), mean.new CountSum(1, 12)))));
combineParDoFn.processElement(
WindowedValue.valueInGlobalWindow(
KV.of("b", Arrays.asList(mean.new CountSum(2, 20), mean.new CountSum(1, 1)))));
combineParDoFn.finishBundle();
Object[] expectedReceivedElems = {
WindowedValue.valueInGlobalWindow(KV.of("a", mean.new CountSum(6, 27))),
WindowedValue.valueInGlobalWindow(KV.of("b", mean.new CountSum(3, 21))),
};
assertArrayEquals(expectedReceivedElems, receiver.receivedElems.toArray());
}
@Override
public Void apply(Iterable<KV<Long, Long>> estimatePerKey) {
for (KV<Long, Long> result : estimatePerKey) {
verifyEstimate(result.getKey(), sampleSize, result.getValue());
}
return null;
}
@Test
@SuppressWarnings("unchecked")
public void testTop() {
Pipeline p = TestPipeline.create();
PCollection<String> input =
p.apply(Create.of(Arrays.asList(COLLECTION)).withCoder(StringUtf8Coder.of()));
PCollection<List<String>> top1 = input.apply(Top.of(1, new OrderByLength()));
PCollection<List<String>> top2 = input.apply(Top.<String>largest(2));
PCollection<List<String>> top3 = input.apply(Top.<String>smallest(3));
PCollection<KV<String, Integer>> inputTable = createInputTable(p);
PCollection<KV<String, List<Integer>>> largestPerKey =
inputTable.apply(Top.<String, Integer>largestPerKey(2));
PCollection<KV<String, List<Integer>>> smallestPerKey =
inputTable.apply(Top.<String, Integer>smallestPerKey(2));
DataflowAssert.thatSingletonIterable(top1).containsInAnyOrder(Arrays.asList("bb"));
DataflowAssert.thatSingletonIterable(top2).containsInAnyOrder("z", "c");
DataflowAssert.thatSingletonIterable(top3).containsInAnyOrder("a", "bb", "c");
DataflowAssert.that(largestPerKey)
.containsInAnyOrder(KV.of("a", Arrays.asList(3, 2)), KV.of("b", Arrays.asList(100, 10)));
DataflowAssert.that(smallestPerKey)
.containsInAnyOrder(KV.of("a", Arrays.asList(1, 2)), KV.of("b", Arrays.asList(1, 10)));
p.run();
}
@Override
public void processElement(ProcessContext c) {
KV<K, AccumT> kv = c.element();
K key = kv.getKey();
OutputT output = this.combineFn.extractOutput(key, kv.getValue());
c.output(KV.of(key, output));
}
/** Unit tests for {@link CombinePerKeyExamples}. */
@RunWith(JUnit4.class)
public class CombinePerKeyExamplesTest {
private static final TableRow row1 =
new TableRow().set("corpus", "king_lear").set("word", "snuffleupaguses");
private static final TableRow row2 =
new TableRow().set("corpus", "macbeth").set("word", "antidisestablishmentarianism");
private static final TableRow row3 =
new TableRow().set("corpus", "king_lear").set("word", "antidisestablishmentarianism");
private static final TableRow row4 = new TableRow().set("corpus", "macbeth").set("word", "bob");
private static final TableRow row5 = new TableRow().set("corpus", "king_lear").set("word", "hi");
static final TableRow[] ROWS_ARRAY = new TableRow[] {row1, row2, row3, row4, row5};
private static final KV<String, String> tuple1 = KV.of("snuffleupaguses", "king_lear");
private static final KV<String, String> tuple2 = KV.of("antidisestablishmentarianism", "macbeth");
private static final KV<String, String> tuple3 =
KV.of("antidisestablishmentarianism", "king_lear");
private static final KV<String, String> combinedTuple1 =
KV.of("antidisestablishmentarianism", "king_lear,macbeth");
private static final KV<String, String> combinedTuple2 = KV.of("snuffleupaguses", "king_lear");
@SuppressWarnings({"unchecked", "rawtypes"})
static final KV<String, String>[] COMBINED_TUPLES_ARRAY =
new KV[] {combinedTuple1, combinedTuple2};
private static final TableRow resultRow1 =
new TableRow().set("word", "snuffleupaguses").set("all_plays", "king_lear");
private static final TableRow resultRow2 =
new TableRow()
.set("word", "antidisestablishmentarianism")
.set("all_plays", "king_lear,macbeth");
@Test
public void testExtractLargeWordsFn() {
DoFnTester<TableRow, KV<String, String>> extractLargeWordsFn =
DoFnTester.of(new ExtractLargeWordsFn());
List<KV<String, String>> results = extractLargeWordsFn.processBatch(ROWS_ARRAY);
Assert.assertThat(results, CoreMatchers.hasItem(tuple1));
Assert.assertThat(results, CoreMatchers.hasItem(tuple2));
Assert.assertThat(results, CoreMatchers.hasItem(tuple3));
}
@Test
public void testFormatShakespeareOutputFn() {
DoFnTester<KV<String, String>, TableRow> formatShakespeareOutputFn =
DoFnTester.of(new FormatShakespeareOutputFn());
List<TableRow> results = formatShakespeareOutputFn.processBatch(COMBINED_TUPLES_ARRAY);
Assert.assertThat(results, CoreMatchers.hasItem(resultRow1));
Assert.assertThat(results, CoreMatchers.hasItem(resultRow2));
}
}
@Override
public void processElement(ProcessContext c) {
KV<K, Iterable<InputT>> kv = c.element();
K key = kv.getKey();
c.output(KV.of(key, this.combineFn.apply(key, kv.getValue())));
}
@Override
public void processElement(ProcessContext c) {
KV<K, Iterable<AccumT>> kv = c.element();
K key = kv.getKey();
AccumT accum = this.combineFn.mergeAccumulators(key, kv.getValue());
c.output(KV.of(key, accum));
}
@Override
public long add(WindowedValue<KV<K, V>> windowedValue) throws IOException {
// The windowed portion of the value is ignored.
KV<K, V> value = windowedValue.getValue();
long currentPosition = out.getCount();
// Marshal the key, compute the common prefix length
keyCoder.encode(value.getKey(), currentKeyBytes.asOutputStream(), Context.OUTER);
int keySize = currentKeyBytes.size();
int sharedKeySize = commonPrefixLength(lastKeyBytes, currentKeyBytes);
// Put key-value mapping record into block buffer
int unsharedKeySize = keySize - sharedKeySize;
KeyPrefix keyPrefix = new KeyPrefix(sharedKeySize, unsharedKeySize);
KeyPrefixCoder.of().encode(keyPrefix, out, Context.NESTED);
currentKeyBytes.writeTo(out, sharedKeySize, unsharedKeySize);
valueCoder.encode(value.getValue(), out, Context.NESTED);
// If we have emitted enough bytes to add another entry into the index.
if (lastIndexedPosition + MAX_BLOCK_SIZE < out.getCount()) {
int sharedIndexKeySize = commonPrefixLength(lastIndexKeyBytes, currentKeyBytes);
int unsharedIndexKeySize = keySize - sharedIndexKeySize;
KeyPrefix indexKeyPrefix = new KeyPrefix(sharedIndexKeySize, unsharedIndexKeySize);
KeyPrefixCoder.of().encode(indexKeyPrefix, indexOut.asOutputStream(), Context.NESTED);
currentKeyBytes.writeTo(
indexOut.asOutputStream(), sharedIndexKeySize, unsharedIndexKeySize);
VarInt.encode(currentPosition, indexOut.asOutputStream());
lastIndexKeyBytes.resetTo(0);
currentKeyBytes.writeTo(lastIndexKeyBytes.asOutputStream(), 0, currentKeyBytes.size());
}
// Update the bloom filter
bloomFilterBuilder.put(currentKeyBytes.array(), 0, currentKeyBytes.size());
// Swap the current key and the previous key, resetting the previous key to be re-used.
RandomAccessData temp = lastKeyBytes;
lastKeyBytes = currentKeyBytes;
currentKeyBytes = temp;
currentKeyBytes.resetTo(0);
numberOfKeysWritten += 1;
return out.getCount() - currentPosition;
}
@Override
public void processElement(ProcessContext c) {
KV<K, Iterable<InputT>> kv = c.element();
K key = kv.getKey();
AccumT accum = this.combineFn.createAccumulator(key);
for (InputT input : kv.getValue()) {
accum = this.combineFn.addInput(key, accum, input);
}
c.output(KV.of(key, accum));
}
private void closeWindow(
K key, W w, Map<W, AccumT> accumulators, Map<W, Instant> minTimestamps, ProcessContext c) {
AccumT accum = accumulators.remove(w);
Instant timestamp = minTimestamps.remove(w);
checkState(accum != null && timestamp != null);
c.windowingInternals()
.outputWindowedValue(
KV.of(key, combineFn.extractOutput(key, accum)),
timestamp,
Arrays.asList(w),
PaneInfo.ON_TIME_AND_ONLY_FIRING);
}
@Test
public void testCombineValuesFnAll() throws Exception {
TestReceiver receiver = new TestReceiver();
Combine.KeyedCombineFn<String, Integer, MeanInts.CountSum, String> combiner =
(new MeanInts()).asKeyedFn();
ParDoFn combineParDoFn = createCombineValuesFn(CombineValuesFn.CombinePhase.ALL, combiner);
combineParDoFn.startBundle(receiver);
combineParDoFn.processElement(
WindowedValue.valueInGlobalWindow(KV.of("a", Arrays.asList(5, 6, 7))));
combineParDoFn.processElement(
WindowedValue.valueInGlobalWindow(KV.of("b", Arrays.asList(1, 3, 7))));
combineParDoFn.processElement(
WindowedValue.valueInGlobalWindow(KV.of("c", Arrays.asList(3, 6, 8, 9))));
combineParDoFn.finishBundle();
Object[] expectedReceivedElems = {
WindowedValue.valueInGlobalWindow(KV.of("a", String.format("%.1f", 6.0))),
WindowedValue.valueInGlobalWindow(KV.of("b", String.format("%.1f", 3.7))),
WindowedValue.valueInGlobalWindow(KV.of("c", String.format("%.1f", 6.5))),
};
assertArrayEquals(expectedReceivedElems, receiver.receivedElems.toArray());
}
@Test
public void testCombineValuesFnExtract() throws Exception {
TestReceiver receiver = new TestReceiver();
MeanInts mean = new MeanInts();
Combine.KeyedCombineFn<String, Integer, MeanInts.CountSum, String> combiner = mean.asKeyedFn();
ParDoFn combineParDoFn = createCombineValuesFn(CombineValuesFn.CombinePhase.EXTRACT, combiner);
combineParDoFn.startBundle(receiver);
combineParDoFn.processElement(
WindowedValue.valueInGlobalWindow(KV.of("a", mean.new CountSum(6, 27))));
combineParDoFn.processElement(
WindowedValue.valueInGlobalWindow(KV.of("b", mean.new CountSum(3, 21))));
combineParDoFn.finishBundle();
assertArrayEquals(
new Object[] {
WindowedValue.valueInGlobalWindow(KV.of("a", String.format("%.1f", 4.5))),
WindowedValue.valueInGlobalWindow(KV.of("b", String.format("%.1f", 7.0)))
},
receiver.receivedElems.toArray());
}
@Test
public void testApproximateUniquePerKey() {
List<KV<Long, Long>> elements = Lists.newArrayList();
List<Long> keys = ImmutableList.of(20L, 50L, 100L);
int elementCount = 1000;
int sampleSize = 100;
// Use the key as the number of unique values.
for (long uniqueCount : keys) {
for (long value = 0; value < elementCount; value++) {
elements.add(KV.of(uniqueCount, value % uniqueCount));
}
}
Pipeline p = TestPipeline.create();
PCollection<KV<Long, Long>> input = p.apply(Create.of(elements));
PCollection<KV<Long, Long>> counts =
input.apply(ApproximateUnique.<Long, Long>perKey(sampleSize));
DataflowAssert.that(counts).satisfies(new VerifyEstimatePerKeyFn(sampleSize));
p.run();
}
@Override
public void processElement(ProcessContext c) {
KV<K, Iterable<RawUnionValue>> e = c.element();
c.output(KV.of(e.getKey(), new CoGbkResult(schema, e.getValue())));
}
@Override
public void processElement(ProcessContext c) {
KV<K, ?> e = c.element();
c.output(KV.of(e.getKey(), new RawUnionValue(index, e.getValue())));
}
@Override
public int hashCode() {
return KV.of(count, sum).hashCode();
}
/** Unfortunately we need to copy the code from the Dataflow SDK because it is not public there. */
public class JoinExamplesITCase extends JavaProgramTestBase {
protected String resultPath;
public JoinExamplesITCase() {}
private static final TableRow row1 =
new TableRow()
.set("ActionGeo_CountryCode", "VM")
.set("SQLDATE", "20141212")
.set("Actor1Name", "BANGKOK")
.set("SOURCEURL", "http://cnn.com");
private static final TableRow row2 =
new TableRow()
.set("ActionGeo_CountryCode", "VM")
.set("SQLDATE", "20141212")
.set("Actor1Name", "LAOS")
.set("SOURCEURL", "http://www.chicagotribune.com");
private static final TableRow row3 =
new TableRow()
.set("ActionGeo_CountryCode", "BE")
.set("SQLDATE", "20141213")
.set("Actor1Name", "AFGHANISTAN")
.set("SOURCEURL", "http://cnn.com");
static final TableRow[] EVENTS = new TableRow[] {row1, row2, row3};
static final List<TableRow> EVENT_ARRAY = Arrays.asList(EVENTS);
private static final KV<String, String> kv1 =
KV.of("VM", "Date: 20141212, Actor1: LAOS, url: http://www.chicagotribune.com");
private static final KV<String, String> kv2 =
KV.of("BE", "Date: 20141213, Actor1: AFGHANISTAN, url: http://cnn.com");
private static final KV<String, String> kv3 = KV.of("BE", "Belgium");
private static final KV<String, String> kv4 = KV.of("VM", "Vietnam");
private static final TableRow cc1 =
new TableRow().set("FIPSCC", "VM").set("HumanName", "Vietnam");
private static final TableRow cc2 =
new TableRow().set("FIPSCC", "BE").set("HumanName", "Belgium");
static final TableRow[] CCS = new TableRow[] {cc1, cc2};
static final List<TableRow> CC_ARRAY = Arrays.asList(CCS);
static final String[] JOINED_EVENTS =
new String[] {
"Country code: VM, Country name: Vietnam, Event info: Date: 20141212, Actor1: LAOS, "
+ "url: http://www.chicagotribune.com",
"Country code: VM, Country name: Vietnam, Event info: Date: 20141212, Actor1: BANGKOK, "
+ "url: http://cnn.com",
"Country code: BE, Country name: Belgium, Event info: Date: 20141213, Actor1: AFGHANISTAN, "
+ "url: http://cnn.com"
};
@Override
protected void preSubmit() throws Exception {
resultPath = getTempDirPath("result");
}
@Override
protected void postSubmit() throws Exception {
compareResultsByLinesInMemory(Joiner.on('\n').join(JOINED_EVENTS), resultPath);
}
@Override
protected void testProgram() throws Exception {
Pipeline p = FlinkTestPipeline.create();
PCollection<TableRow> input1 = p.apply(Create.of(EVENT_ARRAY));
PCollection<TableRow> input2 = p.apply(Create.of(CC_ARRAY));
PCollection<String> output = JoinExamples.joinEvents(input1, input2);
output.apply(TextIO.Write.to(resultPath));
p.run();
}
}
/** Tests for Top. */
@RunWith(JUnit4.class)
public class TopTest {
@Rule public ExpectedException expectedEx = ExpectedException.none();
@SuppressWarnings("unchecked")
static final String[] COLLECTION = new String[] {"a", "bb", "c", "c", "z"};
@SuppressWarnings("unchecked")
static final String[] EMPTY_COLLECTION = new String[] {};
@SuppressWarnings({"rawtypes", "unchecked"})
static final KV<String, Integer>[] TABLE =
new KV[] {
KV.of("a", 1),
KV.of("a", 2),
KV.of("a", 3),
KV.of("b", 1),
KV.of("b", 10),
KV.of("b", 10),
KV.of("b", 100),
};
@SuppressWarnings({"rawtypes", "unchecked"})
static final KV<String, Integer>[] EMPTY_TABLE = new KV[] {};
public PCollection<KV<String, Integer>> createInputTable(Pipeline p) {
return p.apply(
"CreateInputTable",
Create.of(Arrays.asList(TABLE))
.withCoder(KvCoder.of(StringUtf8Coder.of(), BigEndianIntegerCoder.of())));
}
public PCollection<KV<String, Integer>> createEmptyInputTable(Pipeline p) {
return p.apply(
"CreateEmptyInputTable",
Create.of(Arrays.asList(EMPTY_TABLE))
.withCoder(KvCoder.of(StringUtf8Coder.of(), BigEndianIntegerCoder.of())));
}
@Test
@SuppressWarnings("unchecked")
public void testTop() {
Pipeline p = TestPipeline.create();
PCollection<String> input =
p.apply(Create.of(Arrays.asList(COLLECTION)).withCoder(StringUtf8Coder.of()));
PCollection<List<String>> top1 = input.apply(Top.of(1, new OrderByLength()));
PCollection<List<String>> top2 = input.apply(Top.<String>largest(2));
PCollection<List<String>> top3 = input.apply(Top.<String>smallest(3));
PCollection<KV<String, Integer>> inputTable = createInputTable(p);
PCollection<KV<String, List<Integer>>> largestPerKey =
inputTable.apply(Top.<String, Integer>largestPerKey(2));
PCollection<KV<String, List<Integer>>> smallestPerKey =
inputTable.apply(Top.<String, Integer>smallestPerKey(2));
DataflowAssert.thatSingletonIterable(top1).containsInAnyOrder(Arrays.asList("bb"));
DataflowAssert.thatSingletonIterable(top2).containsInAnyOrder("z", "c");
DataflowAssert.thatSingletonIterable(top3).containsInAnyOrder("a", "bb", "c");
DataflowAssert.that(largestPerKey)
.containsInAnyOrder(KV.of("a", Arrays.asList(3, 2)), KV.of("b", Arrays.asList(100, 10)));
DataflowAssert.that(smallestPerKey)
.containsInAnyOrder(KV.of("a", Arrays.asList(1, 2)), KV.of("b", Arrays.asList(1, 10)));
p.run();
}
@Test
@SuppressWarnings("unchecked")
public void testTopEmpty() {
Pipeline p = TestPipeline.create();
PCollection<String> input =
p.apply(Create.of(Arrays.asList(EMPTY_COLLECTION)).withCoder(StringUtf8Coder.of()));
PCollection<List<String>> top1 = input.apply(Top.of(1, new OrderByLength()));
PCollection<List<String>> top2 = input.apply(Top.<String>largest(2));
PCollection<List<String>> top3 = input.apply(Top.<String>smallest(3));
PCollection<KV<String, Integer>> inputTable = createEmptyInputTable(p);
PCollection<KV<String, List<Integer>>> largestPerKey =
inputTable.apply(Top.<String, Integer>largestPerKey(2));
PCollection<KV<String, List<Integer>>> smallestPerKey =
inputTable.apply(Top.<String, Integer>smallestPerKey(2));
DataflowAssert.thatSingletonIterable(top1).empty();
DataflowAssert.thatSingletonIterable(top2).empty();
DataflowAssert.thatSingletonIterable(top3).empty();
DataflowAssert.that(largestPerKey).empty();
DataflowAssert.that(smallestPerKey).empty();
p.run();
}
@Test
public void testTopEmptyWithIncompatibleWindows() {
Pipeline p = TestPipeline.create();
Bound<String> windowingFn = Window.<String>into(FixedWindows.of(Duration.standardDays(10L)));
PCollection<String> input =
p.apply(Create.timestamped(Collections.<String>emptyList(), Collections.<Long>emptyList()))
.apply(windowingFn);
expectedEx.expect(IllegalStateException.class);
expectedEx.expectMessage("Top");
expectedEx.expectMessage("GlobalWindows");
expectedEx.expectMessage("withoutDefaults");
expectedEx.expectMessage("asSingletonView");
input.apply(Top.of(1, new OrderByLength()));
}
@Test
@SuppressWarnings("unchecked")
public void testTopZero() {
Pipeline p = TestPipeline.create();
PCollection<String> input =
p.apply(Create.of(Arrays.asList(COLLECTION)).withCoder(StringUtf8Coder.of()));
PCollection<List<String>> top1 = input.apply(Top.of(0, new OrderByLength()));
PCollection<List<String>> top2 = input.apply(Top.<String>largest(0));
PCollection<List<String>> top3 = input.apply(Top.<String>smallest(0));
PCollection<KV<String, Integer>> inputTable = createInputTable(p);
PCollection<KV<String, List<Integer>>> largestPerKey =
inputTable.apply(Top.<String, Integer>largestPerKey(0));
PCollection<KV<String, List<Integer>>> smallestPerKey =
inputTable.apply(Top.<String, Integer>smallestPerKey(0));
DataflowAssert.thatSingletonIterable(top1).empty();
DataflowAssert.thatSingletonIterable(top2).empty();
DataflowAssert.thatSingletonIterable(top3).empty();
DataflowAssert.that(largestPerKey)
.containsInAnyOrder(
KV.of("a", Arrays.<Integer>asList()), KV.of("b", Arrays.<Integer>asList()));
DataflowAssert.that(smallestPerKey)
.containsInAnyOrder(
KV.of("a", Arrays.<Integer>asList()), KV.of("b", Arrays.<Integer>asList()));
p.run();
}
// This is a purely compile-time test. If the code compiles, then it worked.
@Test
public void testPerKeySerializabilityRequirement() {
Pipeline p = TestPipeline.create();
p.apply(
"CreateCollection", Create.of(Arrays.asList(COLLECTION)).withCoder(StringUtf8Coder.of()));
PCollection<KV<String, Integer>> inputTable = createInputTable(p);
inputTable.apply(Top.<String, Integer, IntegerComparator>perKey(1, new IntegerComparator()));
inputTable.apply(
"PerKey2", Top.<String, Integer, IntegerComparator2>perKey(1, new IntegerComparator2()));
}
@Test
public void testCountConstraint() {
Pipeline p = TestPipeline.create();
PCollection<String> input =
p.apply(Create.of(Arrays.asList(COLLECTION)).withCoder(StringUtf8Coder.of()));
expectedEx.expect(IllegalArgumentException.class);
expectedEx.expectMessage(Matchers.containsString(">= 0"));
input.apply(Top.of(-1, new OrderByLength()));
}
@Test
public void testTopGetNames() {
assertEquals("Top.Globally", Top.of(1, new OrderByLength()).getName());
assertEquals("Smallest.Globally", Top.smallest(1).getName());
assertEquals("Largest.Globally", Top.largest(2).getName());
assertEquals("Top.PerKey", Top.perKey(1, new IntegerComparator()).getName());
assertEquals("Smallest.PerKey", Top.<String, Integer>smallestPerKey(1).getName());
assertEquals("Largest.PerKey", Top.<String, Integer>largestPerKey(2).getName());
}
@Test
public void testDisplayData() {
Top.Largest<Integer> comparer = new Top.Largest<Integer>();
Combine.Globally<Integer, List<Integer>> top = Top.of(1234, comparer);
DisplayData displayData = DisplayData.from(top);
assertThat(displayData, hasDisplayItem("count", 1234));
assertThat(displayData, hasDisplayItem("comparer", comparer.getClass()));
}
private static class OrderByLength implements Comparator<String>, Serializable {
@Override
public int compare(String a, String b) {
if (a.length() != b.length()) {
return a.length() - b.length();
} else {
return a.compareTo(b);
}
}
}
private static class IntegerComparator implements Comparator<Integer>, Serializable {
@Override
public int compare(Integer o1, Integer o2) {
return o1.compareTo(o2);
}
}
private static class IntegerComparator2 implements Comparator<Integer>, Serializable {
@Override
public int compare(Integer o1, Integer o2) {
return o1.compareTo(o2);
}
}
}