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.query;
  
  import java.io.IOException;
  import java.util.Optional;
  import lombok.RequiredArgsConstructor;
  import org.apache.skywalking.oap.server.core.browser.source.BrowserErrorCategory;
  import org.apache.skywalking.oap.server.core.query.input.Duration;
  import org.apache.skywalking.oap.server.core.query.type.BrowserErrorLogs;
  import org.apache.skywalking.oap.server.core.query.type.ErrorCategory;
  import org.apache.skywalking.oap.server.core.query.type.Pagination;
  import org.apache.skywalking.oap.server.core.storage.StorageModule;
  import org.apache.skywalking.oap.server.core.storage.query.IBrowserLogQueryDAO;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.apache.skywalking.oap.server.library.module.Service;
  
  @RequiredArgsConstructor
  public class BrowserLogQueryService implements Service {
      private final ModuleManager moduleManager;
      private IBrowserLogQueryDAO browserLogQueryDAO;
  
      private IBrowserLogQueryDAO getBrowserLogQueryDAO() {
          return Optional.ofNullable(browserLogQueryDAO).orElseGet(() -> {
              browserLogQueryDAO = moduleManager.find(StorageModule.NAME)
                                                .provider()
                                                .getService(IBrowserLogQueryDAO.class);
              return browserLogQueryDAO;
          });
      }
  
      public BrowserErrorLogs queryBrowserErrorLogs(final String serviceId,
                                                    final String serviceVersionId,
                                                    final String pagePathId,
                                                    final ErrorCategory category,
                                                    final Duration duration,
                                                    final Pagination paging) throws IOException {
          PaginationUtils.Page page = PaginationUtils.INSTANCE.exchange(paging);
          BrowserErrorCategory errorCategory = Optional.ofNullable(category)
                                                       .filter(c -> c != ErrorCategory.ALL) // ErrorCategory.All stands for query all.
                                                       .map(c -> BrowserErrorCategory.valueOf(c.name()))
                                                       .orElse(null);
  
          return getBrowserLogQueryDAO().queryBrowserErrorLogs(
              serviceId, serviceVersionId, pagePathId, errorCategory, duration,
              page.getLimit(),
              page.getFrom()
          );
      }
  }
  