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   * 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
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * 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.beam.runners.dataflow.worker.testing;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import org.apache.beam.runners.dataflow.worker.logging.DataflowWorkerLoggingMDC;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TestRule;
  import org.junit.runner.Description;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.junit.runners.model.Statement;
  
  /** Tests for {@link RestoreDataflowLoggingMDC}. */
  @RunWith(JUnit4.class)
  public class RestoreDataflowLoggingMDCTest {
    @Rule public TestRule restoreMDCAfterTest = new RestoreDataflowLoggingMDC();
  
    @Test
    public void testOldValuesAreRestored() throws Throwable {
      // We need our own instance here so that we don't squash any saved values.
      TestRule restoreMDC = new RestoreDataflowLoggingMDC();
  
      final boolean[] evaluateRan = new boolean[1];
      DataflowWorkerLoggingMDC.setJobId("oldJobId");
      DataflowWorkerLoggingMDC.setStageName("oldStageName");
      DataflowWorkerLoggingMDC.setWorkerId("oldWorkerId");
      DataflowWorkerLoggingMDC.setWorkId("oldWorkId");
  
      restoreMDC
          .apply(
              new Statement() {
                @Override
                public void evaluate() {
                  evaluateRan[0] = true;
                  // Ensure parameters are cleared before the test runs
                  assertNull("null JobId", DataflowWorkerLoggingMDC.getJobId());
                  assertNull("null StageName", DataflowWorkerLoggingMDC.getStageName());
                  assertNull("null WorkerId", DataflowWorkerLoggingMDC.getWorkerId());
                  assertNull("null WorkId", DataflowWorkerLoggingMDC.getWorkId());
  
                  // Simulate updating parameters for the test
                  DataflowWorkerLoggingMDC.setJobId("newJobId");
                  DataflowWorkerLoggingMDC.setStageName("newStageName");
                  DataflowWorkerLoggingMDC.setWorkerId("newWorkerId");
                  DataflowWorkerLoggingMDC.setWorkId("newWorkId");
  
                  // Ensure that the values changed
                  assertEquals("newJobId", DataflowWorkerLoggingMDC.getJobId());
                  assertEquals("newStageName", DataflowWorkerLoggingMDC.getStageName());
                  assertEquals("newWorkerId", DataflowWorkerLoggingMDC.getWorkerId());
                  assertEquals("newWorkId", DataflowWorkerLoggingMDC.getWorkId());
                }
              },
              Description.EMPTY)
          .evaluate();
  
      // Validate that the statement ran and that the values were reverted
      assertTrue(evaluateRan[0]);
      assertEquals("oldJobId", DataflowWorkerLoggingMDC.getJobId());
      assertEquals("oldStageName", DataflowWorkerLoggingMDC.getStageName());
      assertEquals("oldWorkerId", DataflowWorkerLoggingMDC.getWorkerId());
      assertEquals("oldWorkId", DataflowWorkerLoggingMDC.getWorkId());
    }
  }
  