@Test
  public void shouldMapWithCustomizedClassMapBuilder() {
    // given
    MapperFactory mapperFactory =
        new DefaultMapperFactory.Builder()
            .classMapBuilderFactory(new ScoringClassMapBuilder.Factory())
            .build();

    mapperFactory.classMap(Source.class, Destination.class).byDefault().register();

    MapperFacade mapperFacade = mapperFactory.getMapperFacade();

    Source src = new Source();
    src.firstName = "Jan";
    src.postalAddress = new PostalAddress();
    src.postalAddress.country = new Country();
    src.postalAddress.country.alphaCode = "PL";

    // when
    Destination result = mapperFacade.map(src, Destination.class);

    // then
    assertThat(result.name.first).isEqualTo("Jan");
    assertThat(result.countryCode).isEqualTo("PL");
  }
Exemplo n.º 2
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 /**
  * Returns a string representation of this object useful for debugging purposes.
  *
  * <p>The output includes details of all the {@link #getRegisteredOutputSegments() registered
  * output segments}.
  *
  * @return a string representation of this object useful for debugging purposes.
  */
 public String getDebugInfo() {
   StringBuffer sb = new StringBuffer();
   for (Iterator i = getRegisteredOutputSegments().iterator(); i.hasNext(); ) {
     OutputSegment outputSegment = (OutputSegment) i.next();
     if (outputSegment instanceof BlankOutputSegment) sb.append("Replace with Spaces: ");
     else if (outputSegment instanceof RemoveOutputSegment) sb.append("Remove: ");
     else sb.append("Replace: ");
     if (sourceText instanceof Source) {
       Source source = (Source) sourceText;
       sb.append('(');
       source.getRowColumnVector(outputSegment.getBegin()).appendTo(sb);
       sb.append('-');
       source.getRowColumnVector(outputSegment.getEnd()).appendTo(sb);
       sb.append(')');
     } else {
       sb.append("(p")
           .append(outputSegment.getBegin())
           .append("-p")
           .append(outputSegment.getEnd())
           .append(')');
     }
     sb.append(' ');
     String outputFromSegment = outputSegment.toString();
     if (outputFromSegment.length() <= 20) {
       sb.append(outputFromSegment);
     } else {
       sb.append(outputFromSegment.substring(0, 20)).append("...");
     }
     sb.append(Config.NewLine);
   }
   return sb.toString();
 }
Exemplo n.º 3
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  @Test
  public void mustBeAbleToRecover() throws Exception {
    final ManualProbe<Integer> publisherProbe = TestPublisher.manualProbe(true, system);
    final JavaTestKit probe = new JavaTestKit(system);

    final Source<Integer, NotUsed> source =
        Source.fromPublisher(publisherProbe)
            .map(
                elem -> {
                  if (elem == 1) throw new RuntimeException("ex");
                  else return elem;
                })
            .recover(new PFBuilder<Throwable, Integer>().matchAny(ex -> 0).build());

    final CompletionStage<Done> future =
        source.runWith(
            Sink.foreach(elem -> probe.getRef().tell(elem, ActorRef.noSender())), materializer);
    final PublisherProbeSubscription<Integer> s = publisherProbe.expectSubscription();
    s.sendNext(0);
    probe.expectMsgEquals(0);
    s.sendNext(1);
    probe.expectMsgEquals(0);

    future.toCompletableFuture().get(200, TimeUnit.MILLISECONDS);
  }
 /** Specify which classes are visible to the compiler through -classpath. */
 public void setVisibleClasses(Map<String, Source> vs) {
   visibleSrcs = new HashSet<>();
   for (String s : vs.keySet()) {
     Source src = vs.get(s);
     visibleSrcs.add(src.file().toURI());
   }
 }
  /**
   * Method removes a Spring bean definition from the XML application context file. Bean definition
   * is identified by its id or bean name.
   *
   * @param project
   * @param id
   */
  public void removeBeanDefinition(File configFile, Project project, String id) {
    Source xsltSource;
    Source xmlSource;
    try {
      xsltSource =
          new StreamSource(new ClassPathResource("transform/delete-bean.xsl").getInputStream());
      xsltSource.setSystemId("delete-bean");

      List<File> configFiles = new ArrayList<>();
      configFiles.add(configFile);
      configFiles.addAll(getConfigImports(configFile, project));

      for (File file : configFiles) {
        xmlSource = new StringSource(FileUtils.readToString(new FileInputStream(configFile)));

        // create transformer
        Transformer transformer = transformerFactory.newTransformer(xsltSource);
        transformer.setParameter("bean_id", id);

        // transform
        StringResult result = new StringResult();
        transformer.transform(xmlSource, result);
        FileUtils.writeToFile(format(result.toString(), project.getSettings().getTabSize()), file);
        return;
      }
    } catch (IOException e) {
      throw new ApplicationRuntimeException(UNABLE_TO_READ_TRANSFORMATION_SOURCE, e);
    } catch (TransformerException e) {
      throw new ApplicationRuntimeException(FAILED_TO_UPDATE_BEAN_DEFINITION, e);
    }
  }
Exemplo n.º 6
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  @Test
  public void mustBeAbleToUseZipWith() throws Exception {
    final JavaTestKit probe = new JavaTestKit(system);
    final Iterable<String> input1 = Arrays.asList("A", "B", "C");
    final Iterable<String> input2 = Arrays.asList("D", "E", "F");

    Source.from(input1)
        .zipWith(
            Source.from(input2),
            new Function2<String, String, String>() {
              public String apply(String s1, String s2) {
                return s1 + "-" + s2;
              }
            })
        .runForeach(
            new Procedure<String>() {
              public void apply(String elem) {
                probe.getRef().tell(elem, ActorRef.noSender());
              }
            },
            materializer);

    probe.expectMsgEquals("A-D");
    probe.expectMsgEquals("B-E");
    probe.expectMsgEquals("C-F");
  }
Exemplo n.º 7
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 @Test
 public void mustProduceTicks() throws Exception {
   final JavaTestKit probe = new JavaTestKit(system);
   Source<String, Cancellable> tickSource =
       Source.tick(
           FiniteDuration.create(1, TimeUnit.SECONDS),
           FiniteDuration.create(500, TimeUnit.MILLISECONDS),
           "tick");
   @SuppressWarnings("unused")
   Cancellable cancellable =
       tickSource
           .to(
               Sink.foreach(
                   new Procedure<String>() {
                     public void apply(String elem) {
                       probe.getRef().tell(elem, ActorRef.noSender());
                     }
                   }))
           .run(materializer);
   probe.expectNoMsg(FiniteDuration.create(600, TimeUnit.MILLISECONDS));
   probe.expectMsgEquals("tick");
   probe.expectNoMsg(FiniteDuration.create(200, TimeUnit.MILLISECONDS));
   probe.expectMsgEquals("tick");
   probe.expectNoMsg(FiniteDuration.create(200, TimeUnit.MILLISECONDS));
 }
  /**
   * Method adds a new Spring bean definition to the XML application context file.
   *
   * @param project
   * @param jaxbElement
   */
  public void addBeanDefinition(File configFile, Project project, Object jaxbElement) {
    Source xsltSource;
    Source xmlSource;
    try {
      xsltSource =
          new StreamSource(new ClassPathResource("transform/add-bean.xsl").getInputStream());
      xsltSource.setSystemId("add-bean");
      xmlSource = new StringSource(FileUtils.readToString(new FileInputStream(configFile)));

      // create transformer
      Transformer transformer = transformerFactory.newTransformer(xsltSource);
      transformer.setParameter(
          "bean_content",
          getXmlContent(jaxbElement)
              .replaceAll("(?m)^(.)", getTabs(1, project.getSettings().getTabSize()) + "$1"));

      // transform
      StringResult result = new StringResult();
      transformer.transform(xmlSource, result);
      FileUtils.writeToFile(
          format(result.toString(), project.getSettings().getTabSize()), configFile);
      return;
    } catch (IOException e) {
      throw new ApplicationRuntimeException(UNABLE_TO_READ_TRANSFORMATION_SOURCE, e);
    } catch (TransformerException e) {
      throw new ApplicationRuntimeException(FAILED_TO_UPDATE_BEAN_DEFINITION, e);
    }
  }
Exemplo n.º 9
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  @Test
  public void mustBeAbleToUseFlatMapMerge() throws Exception {
    final JavaTestKit probe = new JavaTestKit(system);
    final Iterable<Integer> input1 = Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
    final Iterable<Integer> input2 = Arrays.asList(10, 11, 12, 13, 14, 15, 16, 17, 18, 19);
    final Iterable<Integer> input3 = Arrays.asList(20, 21, 22, 23, 24, 25, 26, 27, 28, 29);
    final Iterable<Integer> input4 = Arrays.asList(30, 31, 32, 33, 34, 35, 36, 37, 38, 39);

    final List<Source<Integer, NotUsed>> mainInputs = new ArrayList<Source<Integer, NotUsed>>();
    mainInputs.add(Source.from(input1));
    mainInputs.add(Source.from(input2));
    mainInputs.add(Source.from(input3));
    mainInputs.add(Source.from(input4));

    CompletionStage<List<Integer>> future =
        Source.from(mainInputs)
            .flatMapMerge(3, ConstantFun.<Source<Integer, NotUsed>>javaIdentityFunction())
            .grouped(60)
            .runWith(Sink.<List<Integer>>head(), materializer);

    List<Integer> result = future.toCompletableFuture().get(3, TimeUnit.SECONDS);
    final Set<Integer> set = new HashSet<Integer>();
    for (Integer i : result) {
      set.add(i);
    }
    final Set<Integer> expected = new HashSet<Integer>();
    for (int i = 0; i < 40; ++i) {
      expected.add(i);
    }

    assertEquals(expected, set);
  }
Exemplo n.º 10
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 @Test
 public void mustWorkFromFuture() throws Exception {
   final Iterable<String> input = Arrays.asList("A", "B", "C");
   CompletionStage<String> future1 = Source.from(input).runWith(Sink.<String>head(), materializer);
   CompletionStage<String> future2 =
       Source.fromCompletionStage(future1).runWith(Sink.<String>head(), materializer);
   String result = future2.toCompletableFuture().get(3, TimeUnit.SECONDS);
   assertEquals("A", result);
 }
Exemplo n.º 11
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 private static String getMetaValue(Source source, String key) {
   for (int pos = 0; pos < source.length(); ) {
     StartTag startTag = source.getNextStartTag(pos, "name", key, false);
     if (startTag == null) return null;
     if (startTag.getName() == HTMLElementName.META)
       return startTag.getAttributeValue("content"); // Attribute values are automatically decoded
     pos = startTag.getEnd();
   }
   return null;
 }
 /** Store the source into the set of sources belonging to the given transform. */
 private void addFileToTransform(
     Map<Transformer, Map<String, Set<URI>>> gs, Transformer t, Source s) {
   Map<String, Set<URI>> fs = gs.get(t);
   if (fs == null) {
     fs = new HashMap<>();
     gs.put(t, fs);
   }
   Set<URI> ss = fs.get(s.pkg().name());
   if (ss == null) {
     ss = new HashSet<>();
     fs.put(s.pkg().name(), ss);
   }
   ss.add(s.file().toURI());
 }
Exemplo n.º 13
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  /**
   * Method updates existing Spring bean definitions in a XML application context file. Bean
   * definition is identified by its type defining class.
   *
   * @param project
   * @param type
   * @param jaxbElement
   */
  public void updateBeanDefinitions(
      File configFile, Project project, Class<?> type, Object jaxbElement) {
    Source xsltSource;
    Source xmlSource;
    try {
      xsltSource =
          new StreamSource(
              new ClassPathResource("transform/update-bean-type.xsl").getInputStream());
      xsltSource.setSystemId("update-bean");

      List<File> configFiles = new ArrayList<>();
      configFiles.add(configFile);
      configFiles.addAll(getConfigImports(configFile, project));

      LSParser parser = XMLUtils.createLSParser();
      GetSpringBeansFilter getBeanFilter = new GetSpringBeansFilter(type, null);
      parser.setFilter(getBeanFilter);

      for (File file : configFiles) {
        parser.parseURI(file.toURI().toString());
        if (!CollectionUtils.isEmpty(getBeanFilter.getBeanDefinitions())) {
          xmlSource = new StringSource(FileUtils.readToString(new FileInputStream(file)));

          String beanElement = type.getAnnotation(XmlRootElement.class).name();
          String beanNamespace = type.getPackage().getAnnotation(XmlSchema.class).namespace();

          // create transformer
          Transformer transformer = transformerFactory.newTransformer(xsltSource);
          transformer.setParameter("bean_element", beanElement);
          transformer.setParameter("bean_namespace", beanNamespace);
          transformer.setParameter(
              "bean_content",
              getXmlContent(jaxbElement)
                  .replaceAll("(?m)^(\\s<)", getTabs(1, project.getSettings().getTabSize()) + "$1")
                  .replaceAll("(?m)^(</)", getTabs(1, project.getSettings().getTabSize()) + "$1"));

          // transform
          StringResult result = new StringResult();
          transformer.transform(xmlSource, result);
          FileUtils.writeToFile(
              format(result.toString(), project.getSettings().getTabSize()), file);
          return;
        }
      }
    } catch (IOException e) {
      throw new ApplicationRuntimeException(UNABLE_TO_READ_TRANSFORMATION_SOURCE, e);
    } catch (TransformerException e) {
      throw new ApplicationRuntimeException(FAILED_TO_UPDATE_BEAN_DEFINITION, e);
    }
  }
Exemplo n.º 14
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 @Test
 public void passwordDidntMatchError() {
   SignUpResultPage resultPage =
       signUpPage.signUp(correctName, password, incorrectConfirmPassword, "", correctEmail);
   Assert.assertEquals(
       Source.getValue("SignUpErrorPasswordDidntMatchError"), resultPage.getErrorText());
 }
Exemplo n.º 15
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  @Test
  public void mustBeAbleToUseVoidTypeInForeach() {
    final JavaTestKit probe = new JavaTestKit(system);
    final java.lang.Iterable<String> input = Arrays.asList("a", "b", "c");
    Source<String, NotUsed> ints = Source.from(input);

    final CompletionStage<Done> completion =
        ints.runForeach(elem -> probe.getRef().tell(elem, ActorRef.noSender()), materializer);

    completion.thenAccept(elem -> probe.getRef().tell(String.valueOf(elem), ActorRef.noSender()));

    probe.expectMsgEquals("a");
    probe.expectMsgEquals("b");
    probe.expectMsgEquals("c");
    probe.expectMsgEquals("Done");
  }
Exemplo n.º 16
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  public JavacProcessingEnvironment(Context context, Iterable<? extends Processor> processors) {
    this.context = context;
    log = Log.instance(context);
    source = Source.instance(context);
    diags = JCDiagnostic.Factory.instance(context);
    options = Options.instance(context);
    printProcessorInfo = options.isSet(XPRINTPROCESSORINFO);
    printRounds = options.isSet(XPRINTROUNDS);
    verbose = options.isSet(VERBOSE);
    lint = Lint.instance(context).isEnabled(PROCESSING);
    procOnly = options.isSet(PROC, "only") || options.isSet(XPRINT);
    fatalErrors = options.isSet("fatalEnterError");
    showResolveErrors = options.isSet("showResolveErrors");
    werror = options.isSet(WERROR);
    platformAnnotations = initPlatformAnnotations();
    foundTypeProcessors = false;

    // Initialize services before any processors are initialized
    // in case processors use them.
    filer = new JavacFiler(context);
    messager = new JavacMessager(context, this);
    elementUtils = JavacElements.instance(context);
    typeUtils = JavacTypes.instance(context);
    processorOptions = initProcessorOptions(context);
    unmatchedProcessorOptions = initUnmatchedProcessorOptions();
    messages = JavacMessages.instance(context);
    initProcessorIterator(context, processors);
  }
Exemplo n.º 17
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    @Test
    public void resolve() throws RuleBaseException, TransformException {
      final Node m1 = content.query().single("/id('m1')").node();
      final Node m2 = content.query().single("/id('m2')").node();
      final SortBlock mockBlock = mockery.mock(SortBlock.class);
      SortBlock block =
          new SortBlock(
              db.getFolder("/")
                  .documents()
                  .load(
                      Name.create("rule"),
                      Source.xml("<rule><sort by='ascending'>@foo</sort></rule>"))
                  .root()
                  .query()
                  .single("*")
                  .node()) {
            @Override
            void resolveOrder(Builder aModBuilder, Node node) throws TransformException {
              mockBlock.resolveOrder(aModBuilder, node);
            }

            @Override
            public Seg createSeg(Mod unused) {
              fail();
              return null;
            }
          };
      modBuilder = mockery.mock(Mod.Builder.class);
      mockery.checking(
          new Expectations() {
            {
              one(modBuilder).dependOn(m1.document());
              one(modBuilder).dependOn(m2.document());
              Sequence seq1 = mockery.sequence("pre-commit resolveOrder 1");
              Sequence seq2 = mockery.sequence("pre-commit resolveOrder 2");
              one(mockBlock).resolveOrder(modBuilder, m1);
              inSequence(seq1);
              one(mockBlock).resolveOrder(modBuilder, m2);
              inSequence(seq2);
              modBuilderPriors.add(seq1);
              modBuilderPriors.add(seq2);
            }
          });
      block.requiredVariables =
          Arrays.asList(new QName[] {new QName(null, "a", null), new QName(null, "b", null)});
      dependOnNearest(
          NodeTarget.class,
          false,
          new NodeTarget() {
            public ItemList targets() throws TransformException {
              return content.query().all("/id('m1 m2')");
            }
          });
      order("m1");
      order("m2");
      dependOnVariables(new QName(null, "a", null), new QName(null, "b", null));
      thenCommit();
      block.resolve(modBuilder);
    }
Exemplo n.º 18
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  @Test
  public void nameIsTakenError() {
    String userName = getExistentName();
    Assume.assumeThat(userName, CoreMatchers.notNullValue());

    SignUpResultPage resultPage = signUpPage.signUp(userName, password, password, "", correctEmail);
    Assert.assertEquals(Source.getValue("SignUpErrorNameIsTakenError"), resultPage.getErrorText());
  }
Exemplo n.º 19
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 public void writeTo(final Writer writer) throws IOException {
   this.writer = writer;
   if (segment instanceof Source) ((Source) segment).fullSequentialParse();
   nextTag = segment.source.findNextTag(segment.begin);
   index = segment.begin;
   writeContent(segment.end, segment.getChildElements(), 0);
   writer.flush();
 }
Exemplo n.º 20
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 @Test
 public void mustRepeat() throws Exception {
   final CompletionStage<List<Integer>> f =
       Source.repeat(42).grouped(10000).runWith(Sink.<List<Integer>>head(), materializer);
   final List<Integer> result = f.toCompletableFuture().get(3, TimeUnit.SECONDS);
   assertEquals(result.size(), 10000);
   for (Integer i : result) assertEquals(i, (Integer) 42);
 }
Exemplo n.º 21
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 @Test
 public void mustBeAbleToUseToFuture() throws Exception {
   final JavaTestKit probe = new JavaTestKit(system);
   final Iterable<String> input = Arrays.asList("A", "B", "C");
   CompletionStage<String> future = Source.from(input).runWith(Sink.<String>head(), materializer);
   String result = future.toCompletableFuture().get(3, TimeUnit.SECONDS);
   assertEquals("A", result);
 }
Exemplo n.º 22
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 public void mustSuitablyOverrideAttributeHandlingMethods() {
   @SuppressWarnings("unused")
   final Source<Integer, NotUsed> f =
       Source.single(42)
           .withAttributes(Attributes.name(""))
           .addAttributes(Attributes.asyncBoundary())
           .named("");
 }
Exemplo n.º 23
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 @Test
 public void mustWorkFromRange() throws Exception {
   CompletionStage<List<Integer>> f =
       Source.range(0, 10).grouped(20).runWith(Sink.<List<Integer>>head(), materializer);
   final List<Integer> result = f.toCompletableFuture().get(3, TimeUnit.SECONDS);
   assertEquals(11, result.size());
   Integer counter = 0;
   for (Integer i : result) assertEquals(i, counter++);
 }
Exemplo n.º 24
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  @Test
  public void mustBeAbleToUseMerge2() {
    final JavaTestKit probe = new JavaTestKit(system);
    final Iterable<String> input1 = Arrays.asList("A", "B", "C");
    final Iterable<String> input2 = Arrays.asList("D", "E", "F");

    Source.from(input1)
        .merge(Source.from(input2))
        .runForeach(
            new Procedure<String>() {
              public void apply(String elem) {
                probe.getRef().tell(elem, ActorRef.noSender());
              }
            },
            materializer);

    probe.expectMsgAllOf("A", "B", "C", "D", "E", "F");
  }
Exemplo n.º 25
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  @Ignore("StatefulStage to be converted to GraphStage when Java Api is available (#18817)")
  @Test
  public void mustBeAbleToUseTransform() {
    final JavaTestKit probe = new JavaTestKit(system);
    final Iterable<Integer> input = Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7);
    // duplicate each element, stop after 4 elements, and emit sum to the end
    Source.from(input)
        .transform(
            new Creator<Stage<Integer, Integer>>() {
              @Override
              public PushPullStage<Integer, Integer> create() throws Exception {
                return new StatefulStage<Integer, Integer>() {
                  int sum = 0;
                  int count = 0;

                  @Override
                  public StageState<Integer, Integer> initial() {
                    return new StageState<Integer, Integer>() {
                      @Override
                      public SyncDirective onPush(Integer element, Context<Integer> ctx) {
                        sum += element;
                        count += 1;
                        if (count == 4) {
                          return emitAndFinish(
                              Arrays.asList(element, element, sum).iterator(), ctx);
                        } else {
                          return emit(Arrays.asList(element, element).iterator(), ctx);
                        }
                      }
                    };
                  }

                  @Override
                  public TerminationDirective onUpstreamFinish(Context<Integer> ctx) {
                    return terminationEmit(Collections.singletonList(sum).iterator(), ctx);
                  }
                };
              }
            })
        .runForeach(
            new Procedure<Integer>() {
              public void apply(Integer elem) {
                probe.getRef().tell(elem, ActorRef.noSender());
              }
            },
            materializer);

    probe.expectMsgEquals(0);
    probe.expectMsgEquals(0);
    probe.expectMsgEquals(1);
    probe.expectMsgEquals(1);
    probe.expectMsgEquals(2);
    probe.expectMsgEquals(2);
    probe.expectMsgEquals(3);
    probe.expectMsgEquals(3);
    probe.expectMsgEquals(6);
  }
Exemplo n.º 26
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 @Test
 public void mustBeAbleToUseActorRefSource() throws Exception {
   final JavaTestKit probe = new JavaTestKit(system);
   final Source<Integer, ActorRef> actorRefSource = Source.actorRef(10, OverflowStrategy.fail());
   final ActorRef ref =
       actorRefSource
           .to(
               Sink.foreach(
                   new Procedure<Integer>() {
                     public void apply(Integer elem) {
                       probe.getRef().tell(elem, ActorRef.noSender());
                     }
                   }))
           .run(materializer);
   ref.tell(1, ActorRef.noSender());
   probe.expectMsgEquals(1);
   ref.tell(2, ActorRef.noSender());
   probe.expectMsgEquals(2);
 }
Exemplo n.º 27
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  public void demonstrateAGraphStageWithATimer() throws Exception {
    // tests:
    CompletionStage<Integer> result =
        Source.from(Arrays.asList(1, 2, 3))
            .via(new TimedGate<>(Duration.create(2, "seconds")))
            .takeWithin(Duration.create(250, "millis"))
            .runFold(0, (n, sum) -> n + sum, mat);

    assertEquals(new Integer(1), result.toCompletableFuture().get(3, TimeUnit.SECONDS));
  }
Exemplo n.º 28
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  @Test
  public void demonstrateASimplerOneToManyStage() throws Exception {
    // tests:
    Graph<FlowShape<Integer, Integer>, NotUsed> duplicator =
        Flow.fromGraph(new Duplicator2<Integer>());

    CompletionStage<Integer> result =
        Source.from(Arrays.asList(1, 2, 3)).via(duplicator).runFold(0, (n, sum) -> n + sum, mat);

    assertEquals(new Integer(12), result.toCompletableFuture().get(3, TimeUnit.SECONDS));
  }
Exemplo n.º 29
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  public void demonstrateACustomMaterializedValue() throws Exception {
    // tests:
    RunnableGraph<CompletionStage<Integer>> flow =
        Source.from(Arrays.asList(1, 2, 3))
            .viaMat(new FirstValue(), Keep.right())
            .to(Sink.ignore());

    CompletionStage<Integer> result = flow.run(mat);

    assertEquals(new Integer(1), result.toCompletableFuture().get(3, TimeUnit.SECONDS));
  }
Exemplo n.º 30
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  @Test
  public void demonstrateCustomSourceUsage() throws Exception {
    // #simple-source-usage
    // A GraphStage is a proper Graph, just like what GraphDSL.create would return
    Graph<SourceShape<Integer>, NotUsed> sourceGraph = new NumbersSource();

    // Create a Source from the Graph to access the DSL
    Source<Integer, NotUsed> mySource = Source.fromGraph(sourceGraph);

    // Returns 55
    CompletionStage<Integer> result1 = mySource.take(10).runFold(0, (sum, next) -> sum + next, mat);

    // The source is reusable. This returns 5050
    CompletionStage<Integer> result2 =
        mySource.take(100).runFold(0, (sum, next) -> sum + next, mat);
    // #simple-source-usage

    assertEquals(result1.toCompletableFuture().get(3, TimeUnit.SECONDS), (Integer) 55);
    assertEquals(result2.toCompletableFuture().get(3, TimeUnit.SECONDS), (Integer) 5050);
  }