processing/src/test/java/org/apache/druid/query/MetricsEmittingQueryProcessingPoolTest.java

/*
 * 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.druid.query;

import com.google.common.util.concurrent.ListeningExecutorService;
import org.apache.druid.java.util.emitter.service.ServiceEmitter;
import org.apache.druid.java.util.metrics.StubServiceEmitter;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mockito;

import java.util.concurrent.ScheduledExecutorService;

@SuppressWarnings("DoNotMock")
public class MetricsEmittingQueryProcessingPoolTest
{
  private ScheduledExecutorService timeoutService;

  @Before
  public void setUp()
  {
    timeoutService = Mockito.mock(ScheduledExecutorService.class);
  }

  @Test
  public void testPrioritizedExecutorDelegate()
  {
    PrioritizedExecutorService service = Mockito.mock(PrioritizedExecutorService.class);
    ScheduledExecutorService timeoutService = Mockito.mock(ScheduledExecutorService.class);
    Mockito.when(service.getQueueSize()).thenReturn(10);
    Mockito.when(service.getActiveTasks()).thenReturn(2);
    ExecutorServiceMonitor monitor = new ExecutorServiceMonitor();
    MetricsEmittingQueryProcessingPool processingPool = new MetricsEmittingQueryProcessingPool(
        service,
        timeoutService,
        monitor
    );
    Assert.assertSame(service, processingPool.delegate());

    final StubServiceEmitter serviceEmitter = new StubServiceEmitter("service", "host");
    monitor.doMonitor(serviceEmitter);

    serviceEmitter.verifyValue("segment/scan/pending", 10);
    serviceEmitter.verifyValue("segment/scan/active", 2);
  }

  @Test
  public void testNonPrioritizedExecutorDelegate()
  {
    ListeningExecutorService service = Mockito.mock(ListeningExecutorService.class);
    ExecutorServiceMonitor monitor = new ExecutorServiceMonitor();
    MetricsEmittingQueryProcessingPool processingPool = new MetricsEmittingQueryProcessingPool(
        service,
        timeoutService,
        monitor
    );
    Assert.assertSame(service, processingPool.delegate());

    ServiceEmitter serviceEmitter = Mockito.mock(ServiceEmitter.class);
    monitor.doMonitor(serviceEmitter);
    Mockito.verifyNoInteractions(serviceEmitter);
  }
}