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.profiler;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.Assert.assertEquals;
  
  import java.util.HashMap;
  import org.apache.beam.runners.dataflow.worker.profiler.ScopedProfiler.ProfileScope;
  import org.apache.beam.runners.dataflow.worker.profiler.ScopedProfiler.ProfilerWrapper;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Joiner;
  import org.hamcrest.Matchers;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link ScopedProfiler}. */
  @RunWith(JUnit4.class)
  public class ScopedProfilerTest {
  
    @Test
    public void testProfilerPackage() throws Exception {
      assertEquals(
          "The Profiler class must stay in this package since the implementation is via JNI",
          // Construct the string so IDEs don't "fix it"
          Joiner.on(".").join("org", "apache", "beam", "runners", "dataflow", "worker", "profiler"),
          Profiler.class.getPackage().getName());
    }
  
    @Test
    public void testNoProfiler() throws Exception {
      MockProfiler profiler = new MockProfiler(false);
      ScopedProfiler underTest = new ScopedProfiler(profiler);
      ProfileScope original = underTest.currentScope();
      underTest.registerScope("attribute").activate();
      original.activate();
  
      assertThat(profiler.interactions, Matchers.equalTo(1));
    }
  
    @Test
    public void testProfilerOneBlock() throws Exception {
      MockProfiler profiler = new MockProfiler(true);
      ScopedProfiler underTest = new ScopedProfiler(profiler);
  
      ProfileScope original = underTest.currentScope();
      underTest.registerScope("attribute").activate();
      assertThat(
          profiler.currentState, Matchers.equalTo(profiler.registeredAttributes.get("attribute")));
      original.activate();
  
      assertThat(profiler.currentState, Matchers.equalTo(0));
    }
  
    @Test
    public void testProfilerNestedBlocks() throws Exception {
      MockProfiler profiler = new MockProfiler(true);
      ScopedProfiler underTest = new ScopedProfiler(profiler);
      assertThat(profiler.interactions, Matchers.equalTo(1));
  
      ProfileScope original = underTest.currentScope();
      ProfileScope block1 = underTest.registerScope("attribute1");
      ProfileScope block2 = underTest.registerScope("attribute2");
  
      block1.activate();
      assertThat(
          profiler.currentState, Matchers.equalTo(profiler.registeredAttributes.get("attribute1")));
      block2.activate();
      assertThat(
          profiler.currentState, Matchers.equalTo(profiler.registeredAttributes.get("attribute2")));
      block1.activate();
      assertThat(
          profiler.currentState, Matchers.equalTo(profiler.registeredAttributes.get("attribute1")));
      original.activate();
      assertThat(profiler.currentState, Matchers.equalTo(0));
    }
  
    private static class MockProfiler extends ProfilerWrapper {
      private int interactions = 0;
      private final boolean isProfilerPresent;
      private int currentState;
      private final HashMap<String, Integer> registeredAttributes = new HashMap<>();
  
      private MockProfiler(boolean isProfilerPresent) {
        this.isProfilerPresent = isProfilerPresent;
        this.currentState = 0;
      }
  
      private void interact() {
        interactions++;
        if (!isProfilerPresent) {
          throw new UnsatisfiedLinkError("Profiler is not present");
        }
      }
  
      @Override
      public int getAttribute() {
        interact();
        return currentState;
      }
  
      @Override
      public int setAttribute(int value) {
        interact();
  
        // Check that value could have been assigned by this instance.
        assertThat(
            "Should only setAttribute with values assigned by this instance",
            value,
            Matchers.allOf(
                Matchers.greaterThanOrEqualTo(0),
                Matchers.lessThanOrEqualTo(registeredAttributes.size())));
        int oldState = currentState;
        currentState = value;
        return oldState;
      }
  
      @Override
      public int registerAttribute(String value) {
        interact();
  
        Integer attribute = registeredAttributes.get(value);
        if (attribute == null) {
          attribute = registeredAttributes.size() + 1;
          registeredAttributes.put(value, attribute);
        }
        return attribute;
      }
    }
  }
  