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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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.ambari.server.audit;
  
  import java.text.DateFormat;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  
  import org.apache.ambari.server.audit.event.AuditEvent;
  import org.apache.ambari.server.configuration.Configuration;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.eventbus.Subscribe;
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  
  /**
   * Default audit logger implementation, logs messages into log file
   */
  @Singleton
  public class AuditLoggerDefaultImpl implements AuditLogger {
  
    private static final Logger LOG = LoggerFactory.getLogger("audit");
  
    /**
     * Indicates if audit log feature is enabled
     */
    private final boolean isEnabled;
  
    private ThreadLocal<DateFormat> dateFormatThreadLocal = new ThreadLocal<DateFormat>(){
      @Override
      protected DateFormat initialValue() {
        //2016-03-11T10:42:36.376Z
        return new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXX");
      }
    };
  
    @Inject
    public AuditLoggerDefaultImpl(Configuration configuration) {
      isEnabled = configuration.isAuditLogEnabled();
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    @Subscribe
    public void log(AuditEvent event) {
      if(!isEnabled) {
        return;
      }
  
      Date date = new Date(event.getTimestamp());
      LOG.info("{}, {}", dateFormatThreadLocal.get().format(date), event.getAuditMessage());
    }
  
    @Override
    public boolean isEnabled() {
      return isEnabled;
    }
  }
  