code: /*
   * 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.skywalking.oap.server.analyzer.provider.meter.process;
  
  import org.apache.skywalking.apm.network.language.agent.v3.MeterBucketValue;
  import org.apache.skywalking.apm.network.language.agent.v3.MeterData;
  import org.apache.skywalking.apm.network.language.agent.v3.MeterHistogram;
  import org.apache.skywalking.oap.server.analyzer.provider.meter.config.MeterConfig;
  import org.apache.skywalking.oap.server.analyzer.provider.meter.config.MeterConfigs;
  import org.apache.skywalking.oap.server.core.CoreModule;
  import org.apache.skywalking.oap.server.core.analysis.StreamDefinition;
  import org.apache.skywalking.oap.server.core.analysis.meter.MeterEntity;
  import org.apache.skywalking.oap.server.core.analysis.meter.MeterSystem;
  import org.apache.skywalking.oap.server.core.analysis.meter.function.avg.AvgHistogramFunction;
  import org.apache.skywalking.oap.server.core.analysis.metrics.DataTable;
  import org.apache.skywalking.oap.server.core.analysis.worker.MetricsStreamProcessor;
  import org.apache.skywalking.oap.server.core.config.NamingControl;
  import org.apache.skywalking.oap.server.core.config.group.EndpointNameGrouping;
  import org.apache.skywalking.oap.server.core.query.type.Bucket;
  import org.apache.skywalking.oap.server.core.storage.StorageException;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.apache.skywalking.oap.server.library.module.ModuleProviderHolder;
  import org.apache.skywalking.oap.server.library.module.ModuleServiceHolder;
  import org.apache.skywalking.oap.server.library.module.ModuleStartException;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.Mock;
  import org.mockito.Mockito;
  import org.mockito.junit.jupiter.MockitoExtension;
  import org.powermock.reflect.Whitebox;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicReference;
  
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.ArgumentMatchers.anyString;
  import static org.mockito.Mockito.doAnswer;
  import static org.mockito.Mockito.doNothing;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.spy;
  import static org.mockito.Mockito.when;
  
  @ExtendWith(MockitoExtension.class)
  public class MeterProcessorTest {
  
      @Mock
      private ModuleManager moduleManager;
      private MeterSystem meterSystem;
      private MeterProcessor processor;
  
      private String service = "test-service";
      private String serviceInstance = "test-service-instance";
  
      @BeforeAll
      public static void init() {
          MeterEntity.setNamingControl(
                  new NamingControl(512, 512, 512, new EndpointNameGrouping()));
      }
  
      @BeforeEach
      public void setup() throws StorageException, ModuleStartException {
          meterSystem = spy(new MeterSystem(moduleManager));
          when(moduleManager.find(anyString())).thenReturn(mock(ModuleProviderHolder.class));
          when(moduleManager.find(CoreModule.NAME).provider()).thenReturn(mock(ModuleServiceHolder.class));
          when(moduleManager.find(CoreModule.NAME).provider().getService(MeterSystem.class)).thenReturn(meterSystem);
          Whitebox.setInternalState(MetricsStreamProcessor.class, "PROCESSOR",
                  Mockito.spy(MetricsStreamProcessor.getInstance())
          );
          doNothing().when(MetricsStreamProcessor.getInstance()).create(any(), (StreamDefinition) any(), any());
          final MeterProcessService processService = new MeterProcessService(moduleManager);
          List<MeterConfig> config = MeterConfigs.loadConfig("meter-analyzer-config", Arrays.asList("config"));
          processService.start(config);
          processor = new MeterProcessor(processService);
      }
  
      @Test
      public void testProcess() {
          AtomicReference<AvgHistogramFunction> data = new AtomicReference<>();
          doAnswer(invocationOnMock -> {
              if (AvgHistogramFunction.class.isAssignableFrom(invocationOnMock.getArgument(0).getClass())) {
                  data.set(invocationOnMock.getArgument(0));
              }
              return null;
          }).when(meterSystem).doStreamingCalculation(any());
          processor.read(MeterData.newBuilder()
                          .setService(service)
                          .setServiceInstance(serviceInstance)
                          .setTimestamp(System.currentTimeMillis())
                          .setHistogram(MeterHistogram.newBuilder()
                                  .setName("test_histogram")
                                  .addValues(MeterBucketValue.newBuilder().setIsNegativeInfinity(true).setCount(10).build())
                                  .addValues(MeterBucketValue.newBuilder().setBucket(0).setCount(20).build())
                                  .addValues(MeterBucketValue.newBuilder().setBucket(10).setCount(10).build())
                                  .build())
                  .build());
          processor.process();
  
          // verify data
          final AvgHistogramFunction func = data.get();
          final DataTable summation = new DataTable();
          summation.put(Bucket.INFINITE_NEGATIVE, 10L);
          summation.put("0", 20L);
          summation.put("10", 10L);
          Assertions.assertEquals(summation, func.getSummation());
          final DataTable count = new DataTable();
          count.put(Bucket.INFINITE_NEGATIVE, 1L);
          count.put("0", 1L);
          count.put("10", 1L);
          Assertions.assertEquals(count, func.getCount());
      }
  
  }
  