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Testing framework for Java
There is a newer version: 7.10.1
package org.testng.internal;

import org.testng.ClassMethodMap;
import org.testng.IClassListener;
import org.testng.ITestContext;
import org.testng.ITestNGMethod;
import org.testng.collections.Lists;
import org.testng.internal.annotations.IAnnotationFinder;
import org.testng.thread.IWorker;
import org.testng.xml.XmlSuite;

import java.util.Collection;
import java.util.Collections;
import java.util.List;

public abstract class AbstractParallelWorker {

  public static AbstractParallelWorker newWorker(XmlSuite.ParallelMode mode, boolean groupByInstances) {
    if (XmlSuite.ParallelMode.INSTANCES.equals(mode) && groupByInstances) {
      return new InstanceBasedParallelParallelWorker();
    }
    return new ClassBasedParallelWorker();
  }

  public abstract List> createWorkers(Arguments arguments);

  public static class Arguments {
    private List methods;
    private IInvoker invoker;
    private ConfigurationGroupMethods configMethods;
    private ClassMethodMap classMethodMap;
    private List listeners;
    private ITestContext testContext;
    private IAnnotationFinder finder;

    private Arguments() {
      // We have a builder. Defeat instantiation via constructors.
    }

    public List getMethods() {
      return Collections.unmodifiableList(methods);
    }

    public IInvoker getInvoker() {
      return invoker;
    }

    public ConfigurationGroupMethods getConfigMethods() {
      return configMethods;
    }

    public ClassMethodMap getClassMethodMap() {
      return classMethodMap;
    }

    List getListeners() {
      return Collections.unmodifiableList(listeners);
    }

    public ITestContext getTestContext() {
      return testContext;
    }

    public IAnnotationFinder getFinder() {
      return finder;
    }

    public static class Builder {
      private Arguments instance;

      public Builder() {
        instance = new Arguments();
      }

      public Builder methods(List methods) {
        instance.methods = methods;
        return this;
      }

      public Builder invoker(IInvoker invoker) {
        instance.invoker = invoker;
        return this;
      }

      public Builder configMethods(ConfigurationGroupMethods configMethods) {
        instance.configMethods = configMethods;
        return this;
      }

      public Builder classMethodMap(ClassMethodMap classMethodMap) {
        instance.classMethodMap = classMethodMap;
        return this;
      }

      public Builder listeners(Collection listeners) {
        instance.listeners = Lists.newLinkedList(listeners);
        return this;
      }

      public Builder testContext(ITestContext testContext) {
        instance.testContext = testContext;
        return this;
      }

      public Builder finder(IAnnotationFinder finder) {
        instance.finder = finder;
        return this;
      }

      public Arguments build() {
        return instance;
      }
    }
  }
}