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.status;
  
  import static org.apache.beam.runners.dataflow.worker.status.ThreadzServlet.Stack;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.Assert.assertEquals;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  import org.hamcrest.Matchers;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link Threadzservlet}. */
  @RunWith(JUnit4.class)
  public class ThreadzServletTest {
  
    @Test
    public void testDeduping() throws Exception {
      Map<Thread, StackTraceElement[]> stacks =
          ImmutableMap.of(
              new Thread("Thread1"),
              new StackTraceElement[] {new StackTraceElement("Class", "Method1", "File", 11)},
              new Thread("Thread2"),
              new StackTraceElement[] {new StackTraceElement("Class", "Method1", "File", 11)},
              new Thread("Thread3"),
              new StackTraceElement[] {new StackTraceElement("Class", "Method2", "File", 17)});
  
      Map<Stack, List<String>> deduped = ThreadzServlet.deduplicateThreadStacks(stacks);
  
      assertEquals(2, deduped.size());
      assertThat(
          deduped,
          Matchers.hasEntry(
              new Stack(
                  new StackTraceElement[] {new StackTraceElement("Class", "Method1", "File", 11)},
                  Thread.State.NEW),
              Arrays.asList("Thread[Thread1,5,main]", "Thread[Thread2,5,main]")));
      assertThat(
          deduped,
          Matchers.hasEntry(
              new Stack(
                  new StackTraceElement[] {new StackTraceElement("Class", "Method2", "File", 17)},
                  Thread.State.NEW),
              Arrays.asList("Thread[Thread3,5,main]")));
    }
  }
  