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.core.storage;
  
  import lombok.Data;
  import org.apache.skywalking.oap.server.core.CoreModuleConfig;
  import org.apache.skywalking.oap.server.core.analysis.worker.MetricsPersistentWorker;
  import org.apache.skywalking.oap.server.core.analysis.worker.MetricsStreamProcessor;
  import org.apache.skywalking.oap.server.core.analysis.worker.TopNStreamProcessor;
  import org.apache.skywalking.oap.server.core.analysis.worker.TopNWorker;
  import org.apache.skywalking.oap.server.library.client.request.InsertRequest;
  import org.apache.skywalking.oap.server.library.client.request.PrepareRequest;
  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.telemetry.api.MetricsCreator;
  import org.apache.skywalking.oap.server.telemetry.none.MetricsCreatorNoop;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.powermock.reflect.Whitebox;
  
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  import java.util.UUID;
  import java.util.concurrent.CompletableFuture;
  
  import static org.mockito.ArgumentMatchers.anyString;
  import static org.mockito.Mockito.doAnswer;
  import static org.mockito.Mockito.doReturn;
  import static org.mockito.Mockito.mock;
  
  public class PersistenceTimerTest {
  
      @Test
      public void testExtractDataAndSave() throws Exception {
          Set<PrepareRequest> result = new HashSet();
          int count = 101;
          int workCount = 10;
          CoreModuleConfig moduleConfig = new CoreModuleConfig();
          moduleConfig.setPersistentPeriod(Integer.MAX_VALUE);
          IBatchDAO iBatchDAO = new IBatchDAO() {
              @Override
              public void insert(InsertRequest insertRequest) {
  
              }
  
              @Override
              public CompletableFuture<Void> flush(final List<PrepareRequest> prepareRequests) {
                  synchronized (result) {
                      result.addAll(prepareRequests);
                  }
                  return CompletableFuture.completedFuture(null);
              }
          };
          for (int i = 0; i < workCount; i++) {
              MetricsStreamProcessor.getInstance().getPersistentWorkers().add(genWorkers(i, count));
              TopNStreamProcessor.getInstance().getPersistentWorkers().add(genTopNWorkers(i, count));
          }
          ModuleManager moduleManager = mock(ModuleManager.class);
          ModuleServiceHolder moduleServiceHolder = mock(ModuleServiceHolder.class);
          doReturn((ModuleProviderHolder) () -> moduleServiceHolder).when(moduleManager).find(anyString());
          doReturn(new MetricsCreatorNoop()).when(moduleServiceHolder).getService(MetricsCreator.class);
          doReturn(iBatchDAO).when(moduleServiceHolder).getService(IBatchDAO.class);
          PersistenceTimer.INSTANCE.isStarted = true;
  
          PersistenceTimer.INSTANCE.start(moduleManager, moduleConfig);
          CompletableFuture<Void> f = Whitebox.invokeMethod(PersistenceTimer.INSTANCE, "extractDataAndSave", iBatchDAO);
          f.join();
  
          Assertions.assertEquals(count * workCount * 2, result.size());
      }
  
      private MetricsPersistentWorker genWorkers(int num, int count) {
          MetricsPersistentWorker persistenceWorker = mock(MetricsPersistentWorker.class);
          doAnswer(invocation -> {
              List<MockStorageData> results = new ArrayList<>(count);
              for (int i = 0; i < count; i++) {
                  results.add(new MockStorageData(num + " " + UUID.randomUUID()));
              }
              return results;
          }).when(persistenceWorker).buildBatchRequests();
          return persistenceWorker;
      }
  
      private TopNWorker genTopNWorkers(int num, int count) {
          TopNWorker persistenceWorker = mock(TopNWorker.class);
          doAnswer(invocation -> {
              List<MockStorageData> results = new ArrayList<>(count);
              for (int i = 0; i < count; i++) {
                  results.add(new MockStorageData(num + " " + UUID.randomUUID()));
              }
              return results;
          }).when(persistenceWorker).buildBatchRequests();
          return persistenceWorker;
      }
  
      @Data
      static class MockStorageData implements StorageData {
          private final String id;
  
          @Override
          public StorageID id() {
              return new StorageID().append("ID", id);
          }
  
      }
  
  }
  