val onException: (IOException) -> Unit,
) : ForwardingSink(delegate) {
  private var hasErrors = false

  override fun write(
    source: Buffer,
    byteCount: Long,
  ) {
    if (hasErrors) {
      source.skip(byteCount)
      return
    }
    try {
      super.write(source, byteCount)
    } catch (e: IOException) {
      hasErrors = true
      onException(e)
    }
  }

  override fun flush() {

        toolchainsMerger.merge(userToolchains, globalToolchains, TrackableBase.GLOBAL_LEVEL);

        problems.setSource("");

        userToolchains = interpolate(userToolchains, problems);

        if (hasErrors(problems.getProblems())) {
            throw new ToolchainsBuildingException(problems.getProblems());
        }

        return new DefaultToolchainsBuildingResult(userToolchains, problems.getProblems());
    }

 *
 */
public interface ModelProblemCollector {

    ProblemCollector<ModelProblem> getProblemCollector();

    default boolean hasErrors() {
        return getProblemCollector().hasErrorProblems();
    }

    default boolean hasFatalErrors() {
        return getProblemCollector().hasFatalProblems();
    }

            severities.add(problem.getSeverity());
        }
    }

    public boolean hasFatalErrors() {
        return severities.contains(ModelProblem.Severity.FATAL);
    }

    public boolean hasErrors() {
        return severities.contains(ModelProblem.Severity.ERROR) || severities.contains(ModelProblem.Severity.FATAL);
    }

    @Override
    public List<ModelProblem> getProblems() {
        return problems;

    }

    protected boolean hasModelErrors(ModelProblemCollectorExt problems) {
        if (problems instanceof DefaultModelProblemCollector collector) {
            return collector.hasErrors();
        } else {
            // the default execution path only knows the DefaultModelProblemCollector,
            // only reason it's not in signature is because it's package private

        SuggestIndexResponse response1 = new SuggestIndexResponse(10, 5, null, 100);
        assertFalse(response1.hasError());

        List<Throwable> errors = new ArrayList<>();
        errors.add(new Exception("Test error"));
        SuggestIndexResponse response2 = new SuggestIndexResponse(10, 5, errors, 100);
        assertTrue(response2.hasError());
    }

    @Test
    public void test_getErrors() throws Exception {

        SuggestDeleteResponse response1 = new SuggestDeleteResponse(null, 100);
        assertFalse(response1.hasError());

        List<Throwable> errors = new ArrayList<>();
        errors.add(new Exception("Test error"));
        SuggestDeleteResponse response2 = new SuggestDeleteResponse(errors, 100);
        assertTrue(response2.hasError());
    }

    @Test
    public void test_getErrors() throws Exception {

        assertNotNull(response);
        assertEquals(1, response.getNumberOfInputDocs());
        assertEquals(1, response.getNumberOfSuggestDocs());
        assertFalse(response.hasError());
    }

    @Test
    public void test_indexMultipleItems() throws Exception {
        SuggestItem[] items = new SuggestItem[3];

        for (int i = 0; i < 3; i++) {

        assertNotNull(response);
        assertFalse(response.hasError());
    }

    @Test
    public void test_deleteDocumentWordsOnEmptyIndex() throws Exception {
        SuggestDeleteResponse response = suggester.indexer().deleteDocumentWords();

        assertNotNull(response);
        assertFalse(response.hasError());
    }

    @Test

        final AtomicBoolean hasError = new AtomicBoolean(false);

        Thread[] threads = new Thread[threadCount];

        for (int i = 0; i < threadCount; i++) {
            threads[i] = new Thread(() -> {
                try {
                    curtainFinallyHook.hook(assistantDirector);
                } catch (Exception e) {
                    hasError.set(true);
                }
            });