content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.bigtop.itest.junit;
  
  import org.junit.runners.BlockJUnit4ClassRunner;
  import org.junit.runners.model.FrameworkMethod;
  import org.junit.runners.model.InitializationError;
  
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  /**
   * This is a variation of a OrderedParametrized JUnit runner that lets arrange individual
   * tests into ordered sequence of run stages via adding a @RunStage(level=X)
   * annotation to the desired testcases (default run stage
   * is 0). Later on run stages are executed according to the order of their levels
   * and testcases within the same run stage have no guaranteed order of execution.
   * <p>
   * Here's how to use it:
   * <pre>
   * public class Example {
   *    <b>@RunStage(level=-1)</b>
   *    <b>@Test</b>
   *    public void earlyTest() {
   *    }
   *
   *    <b>@RunStage(level=1)</b>
   *    <b>@Test</b>
   *    public void lateTest() {
   *    }
   * }
   * </pre>
   */
  public class Ordered extends BlockJUnit4ClassRunner {
    /**
     * Annotation for a method which provides parameters to be injected into the
     * test class constructor by <code>Ordered</code>
     */
    @Retention(RetentionPolicy.RUNTIME)
    @Target(ElementType.METHOD)
    public @interface RunStage {
      int level() default 0;
    }
  
    public Ordered(Class klass) throws InitializationError {
      super(klass);
    }
  
    @Override
    protected List<FrameworkMethod> computeTestMethods() {
      List<FrameworkMethod> c = super.computeTestMethods();
      Collections.sort(c, new Comparator<FrameworkMethod>() {
        public int compare(FrameworkMethod m1, FrameworkMethod m2) {
          RunStage r1 = m1.getAnnotation(RunStage.class);
          RunStage r2 = m2.getAnnotation(RunStage.class);
          return ((r1 != null) ? r1.level() : 0) -
              ((r2 != null) ? r2.level() : 0);
        }
      });
      return c;
    }
  }
  