content: /*
   * 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.beam.runners.fnexecution.logging;
  
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.LogEntry;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A {@link LogWriter} which uses an {@link Logger SLF4J Logger} as the underlying log backend.
   *
   * <p>Ignores the {@code timestamp}, {@code instruction reference}, {@code primitive transform
   * reference}, and {@code thread} fields.
   */
  public class Slf4jLogWriter implements LogWriter {
    public static LogWriter getDefault() {
      return new Slf4jLogWriter();
    }
  
    private Slf4jLogWriter() {}
  
    @Override
    public void log(LogEntry entry) {
      Logger log;
      String location = entry.getLogLocation();
      if (location != null) {
        log = LoggerFactory.getLogger(location);
      } else {
        // TODO: Provide a useful default
        log = LoggerFactory.getLogger("RemoteLog");
      }
      String message = entry.getMessage();
      String trace = entry.getTrace();
      switch (entry.getSeverity()) {
        case ERROR:
        case CRITICAL:
          if (trace == null) {
            log.error(message);
          } else {
            log.error("{} {}", message, trace);
          }
          break;
        case WARN:
          if (trace == null) {
            log.warn(message);
          } else {
            log.warn("{} {}", message, trace);
          }
          break;
        case INFO:
        case NOTICE:
          log.info(message);
          break;
        case DEBUG:
          log.debug(message);
          break;
        case UNSPECIFIED:
        case TRACE:
          log.trace(message);
          break;
        default:
          log.warn("Unknown message severity {}", entry.getSeverity());
          log.info(message);
          break;
      }
    }
  }
  