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Testing framework for Java
There is a newer version: 7.10.2
package org.testng.internal.invokers;

import java.util.Iterator;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import org.testng.ITestContext;
import org.testng.ITestResult;
import org.testng.collections.CollectionUtils;
import org.testng.collections.Lists;
import org.testng.internal.Parameters;
import org.testng.internal.PoolService;
import org.testng.internal.invokers.ITestInvoker.FailureContext;
import org.testng.internal.invokers.TestMethodArguments.Builder;
import org.testng.xml.XmlSuite;

public class MethodRunner implements IMethodRunner {

  @Override
  public List runInSequence(
      TestMethodArguments arguments,
      ITestInvoker testInvoker,
      ITestContext context,
      AtomicInteger invocationCount,
      FailureContext failure,
      Iterator allParamValues,
      boolean skipFailedInvocationCounts) {
    List result = Lists.newArrayList();
    int parametersIndex = 0;
    Iterable allParameterValues = CollectionUtils.asIterable(allParamValues);
    for (Object[] next : allParameterValues) {
      if (next == null) {
        // skipped value
        parametersIndex++;
        continue;
      }
      Object[] parameterValues =
          Parameters.injectParameters(
              next, arguments.getTestMethod().getConstructorOrMethod().getMethod(), context);

      List tmpResults = Lists.newArrayList();
      int tmpResultsIndex = -1;
      TestMethodArguments tmArguments =
          new Builder()
              .usingArguments(arguments)
              .withParameterValues(parameterValues)
              .withParametersIndex(parametersIndex)
              .build();
      try {
        ITestResult tmpResult =
            testInvoker.invokeTestMethod(tmArguments, context.getSuite().getXmlSuite(), failure);
        tmpResults.add(tmpResult);
        tmpResultsIndex++;
      } finally {
        boolean lastSuccess = false;
        if (tmpResultsIndex >= 0) {
          lastSuccess = (tmpResults.get(tmpResultsIndex).getStatus() == ITestResult.SUCCESS);
        }
        if (failure.instances.isEmpty() || lastSuccess) {
          result.addAll(tmpResults);
        } else {
          List retryResults = Lists.newArrayList();
          failure = testInvoker.retryFailed(tmArguments, retryResults, failure.count, context);
          result.addAll(retryResults);
        }

        // If we have a failure, skip all the
        // other invocationCounts
        if (failure.count > 0
            && (skipFailedInvocationCounts
                || tmArguments.getTestMethod().skipFailedInvocations())) {
          while (invocationCount.getAndDecrement() > 0) {
            ITestResult r =
                testInvoker.registerSkippedTestResult(
                    tmArguments.getTestMethod(), System.currentTimeMillis(), null);
            result.add(r);
            InvokedMethod invokedMethod = new InvokedMethod(System.currentTimeMillis(), r);
            testInvoker.invokeListenersForSkippedTestResult(r, invokedMethod);
          }
        }
      } // end finally
      parametersIndex++;
    }
    return result;
  }

  @Override
  public List runInParallel(
      TestMethodArguments arguments,
      ITestInvoker testInvoker,
      ITestContext context,
      AtomicInteger invocationCount,
      FailureContext failure,
      Iterator allParamValues,
      boolean skipFailedInvocationCounts) {
    XmlSuite suite = context.getSuite().getXmlSuite();
    List result = Lists.newArrayList();
    List workers = Lists.newArrayList();
    int parametersIndex = 0;
    Iterable allParameterValues = CollectionUtils.asIterable(allParamValues);
    for (Object[] next : allParameterValues) {
      if (next == null) {
        // skipped value
        parametersIndex += 1;
        continue;
      }
      Object[] parameterValues =
          Parameters.injectParameters(
              next, arguments.getTestMethod().getConstructorOrMethod().getMethod(), context);

      TestMethodWithDataProviderMethodWorker w =
          new TestMethodWithDataProviderMethodWorker(
              testInvoker,
              arguments.getTestMethod(),
              parametersIndex,
              parameterValues,
              arguments.getInstance(),
              arguments.getParameters(),
              arguments.getTestClass(),
              arguments.getBeforeMethods(),
              arguments.getAfterMethods(),
              arguments.getGroupMethods(),
              context,
              skipFailedInvocationCounts,
              invocationCount.get(),
              failure.count,
              testInvoker.getNotifier());
      workers.add(w);
      // testng387: increment the param index in the bag.
      parametersIndex += 1;
    }
    PoolService> ps = new PoolService<>(suite.getDataProviderThreadCount());
    List> r = ps.submitTasksAndWait(workers);
    for (List l2 : r) {
      result.addAll(l2);
    }
    return result;
  }
}