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
   *
   *     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 org.apache.beam.runners.dataflow.worker.logging.DataflowWorkerLoggingMDC;
  import org.junit.rules.ExternalResource;
  
  /** Saves, clears and restores the current thread-local logging parameters for tests. */
  public class RestoreDataflowLoggingMDC extends ExternalResource {
    private String previousJobId;
    private String previousStageName;
    private String previousWorkerId;
    private String previousWorkId;
  
    public RestoreDataflowLoggingMDC() {}
  
    @Override
    protected void before() throws Throwable {
      previousJobId = DataflowWorkerLoggingMDC.getJobId();
      previousStageName = DataflowWorkerLoggingMDC.getStageName();
      previousWorkerId = DataflowWorkerLoggingMDC.getWorkerId();
      previousWorkId = DataflowWorkerLoggingMDC.getWorkId();
      DataflowWorkerLoggingMDC.setJobId(null);
      DataflowWorkerLoggingMDC.setStageName(null);
      DataflowWorkerLoggingMDC.setWorkerId(null);
      DataflowWorkerLoggingMDC.setWorkId(null);
    }
  
    @Override
    protected void after() {
      DataflowWorkerLoggingMDC.setJobId(previousJobId);
      DataflowWorkerLoggingMDC.setStageName(previousStageName);
      DataflowWorkerLoggingMDC.setWorkerId(previousWorkerId);
      DataflowWorkerLoggingMDC.setWorkId(previousWorkId);
    }
  }
  