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.log.analyzer.provider.log;
  
  import com.google.protobuf.Message;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  import lombok.RequiredArgsConstructor;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.apm.network.logging.v3.LogData;
  import org.apache.skywalking.oap.server.core.UnexpectedException;
  import org.apache.skywalking.oap.server.core.analysis.Layer;
  import org.apache.skywalking.oap.server.library.util.StringUtil;
  import org.apache.skywalking.oap.log.analyzer.provider.LogAnalyzerModuleConfig;
  import org.apache.skywalking.oap.log.analyzer.provider.log.listener.LogAnalysisListener;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  
  /**
   * Analyze the collected log data, is the entry point for log analysis.
   */
  @Slf4j
  @RequiredArgsConstructor
  public class LogAnalyzer {
      private final ModuleManager moduleManager;
      private final LogAnalyzerModuleConfig moduleConfig;
      private final ILogAnalysisListenerManager factoryManager;
  
      private final List<LogAnalysisListener> listeners = new ArrayList<>();
  
      public void doAnalysis(LogData.Builder builder, Message extraLog) {
          if (StringUtil.isEmpty(builder.getService())) {
              // If the service name is empty, the log will be ignored.
              log.debug("The log is ignored because the Service name is empty");
              return;
          }
          Layer layer;
          if ("".equals(builder.getLayer())) {
              layer = Layer.GENERAL;
          } else {
              try {
                  layer = Layer.nameOf(builder.getLayer());
              } catch (UnexpectedException e) {
                  log.warn("The Layer {} is not found, abandon the log.", builder.getLayer());
                  return;
              }
          }
  
          createAnalysisListeners(layer);
          if (builder.getTimestamp() == 0) {
              // If no timestamp, OAP server would use the received timestamp as log's timestamp
              builder.setTimestamp(System.currentTimeMillis());
          }
  
          notifyAnalysisListener(builder, extraLog);
          notifyAnalysisListenerToBuild();
      }
  
      private void notifyAnalysisListener(LogData.Builder builder, final Message extraLog) {
          listeners.forEach(listener -> listener.parse(builder, extraLog));
      }
  
      private void notifyAnalysisListenerToBuild() {
          listeners.forEach(LogAnalysisListener::build);
      }
  
      private void createAnalysisListeners(Layer layer) {
          factoryManager.getLogAnalysisListenerFactories()
                        .stream()
                        .map(factory -> factory.create(layer))
                        .filter(Objects::nonNull)
                        .forEach(listeners::add);
      }
  }
  