/*
    * 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.logging.log4j.core.appender;
  
  import org.apache.logging.log4j.core.Filter;
  import org.apache.logging.log4j.core.Layout;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy;
  import org.apache.logging.log4j.core.appender.rolling.FastRollingFileManager;
  import org.apache.logging.log4j.core.appender.rolling.RollingFileManager;
  import org.apache.logging.log4j.core.appender.rolling.RolloverStrategy;
  import org.apache.logging.log4j.core.appender.rolling.TriggeringPolicy;
  import org.apache.logging.log4j.core.config.Configuration;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.core.config.plugins.PluginAttr;
  import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
  import org.apache.logging.log4j.core.config.plugins.PluginElement;
  import org.apache.logging.log4j.core.config.plugins.PluginFactory;
  import org.apache.logging.log4j.core.layout.PatternLayout;
  import org.apache.logging.log4j.core.net.Advertiser;
  
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * An appender that writes to random access files and can roll over at
   * intervals.
   */
  @Plugin(name = "FastRollingFile", category = "Core", elementType = "appender", printObject = true)
  public final class FastRollingFileAppender<T extends Serializable> extends AbstractOutputStreamAppender<T> {
  
      private final String fileName;
      private final String filePattern;
      private Object advertisement;
      private final Advertiser advertiser;
  
      private FastRollingFileAppender(String name, Layout<T> layout,
              Filter filter, RollingFileManager manager, String fileName,
              String filePattern, boolean handleException,
              boolean immediateFlush, Advertiser advertiser) {
          super(name, layout, filter, handleException, immediateFlush, manager);
          if (advertiser != null) {
              Map<String, String> configuration = new HashMap<String, String>(
                      layout.getContentFormat());
              configuration.put("contentType", layout.getContentType());
              configuration.put("name", name);
              advertisement = advertiser.advertise(configuration);
          }
          this.fileName = fileName;
          this.filePattern = filePattern;
          this.advertiser = advertiser;
      }
  
      @Override
      public void stop() {
          super.stop();
          if (advertiser != null) {
              advertiser.unadvertise(advertisement);
          }
      }
  
      /**
       * Write the log entry rolling over the file when required.
       *
       * @param event The LogEvent.
       */
      @Override
      public void append(final LogEvent event) {
          FastRollingFileManager manager = (FastRollingFileManager) getManager();
          manager.checkRollover(event);
  
          // Leverage the nice batching behaviour of async Loggers/Appenders:
          // we can signal the file manager that it needs to flush the buffer
          // to disk at the end of a batch.
          // From a user's point of view, this means that all log events are
          // _always_ available in the log file, without incurring the overhead
          // of immediateFlush=true.
          manager.setEndOfBatch(event.isEndOfBatch());
          super.append(event);
      }
  
      /**
       * Returns the File name for the Appender.
       *
      * @return The file name.
      */
     public String getFileName() {
         return fileName;
     }
 
     /**
      * Returns the file pattern used when rolling over.
      *
      * @return The file pattern.
      */
     public String getFilePattern() {
         return filePattern;
     }
 
     /**
      * Create a FastRollingFileAppender.
      *
      * @param fileName The name of the file that is actively written to.
      *            (required).
      * @param filePattern The pattern of the file name to use on rollover.
      *            (required).
      * @param append If true, events are appended to the file. If false, the
      *            file is overwritten when opened. Defaults to "true"
      * @param name The name of the Appender (required).
      * @param immediateFlush When true, events are immediately flushed. Defaults
      *            to "true".
      * @param policy The triggering policy. (required).
      * @param strategy The rollover strategy. Defaults to
      *            DefaultRolloverStrategy.
      * @param layout The layout to use (defaults to the default PatternLayout).
      * @param filter The Filter or null.
      * @param suppress "true" if exceptions should be hidden from the
      *            application, "false" otherwise. The default is "true".
      * @param advertise "true" if the appender configuration should be
      *            advertised, "false" otherwise.
      * @param advertiseURI The advertised URI which can be used to retrieve the
      *            file contents.
      * @param config The Configuration.
      * @return A FastRollingFileAppender.
      */
     @PluginFactory
     public static <S extends Serializable> FastRollingFileAppender<S> createAppender(
             @PluginAttr("fileName") final String fileName,
             @PluginAttr("filePattern") final String filePattern,
             @PluginAttr("append") final String append,
             @PluginAttr("name") final String name,
             @PluginAttr("immediateFlush") final String immediateFlush,
             @PluginElement("policy") final TriggeringPolicy policy,
             @PluginElement("strategy") RolloverStrategy strategy,
             @PluginElement("layout") Layout<S> layout,
             @PluginElement("filter") final Filter filter,
             @PluginAttr("suppressExceptions") final String suppress,
             @PluginAttr("advertise") final String advertise,
             @PluginAttr("advertiseURI") final String advertiseURI,
             @PluginConfiguration final Configuration config) {
 
         final boolean isAppend = append == null ? true : Boolean
                 .valueOf(append);
         final boolean handleExceptions = suppress == null ? true : Boolean
                 .valueOf(suppress);
         final boolean isFlush = immediateFlush == null ? true : Boolean
                 .valueOf(immediateFlush);
         boolean isAdvertise = advertise == null ? false : Boolean
                 .valueOf(advertise);
 
         if (name == null) {
             LOGGER.error("No name provided for FileAppender");
             return null;
         }
 
         if (fileName == null) {
             LOGGER.error("No filename was provided for FileAppender with name "
                     + name);
             return null;
         }
 
         if (filePattern == null) {
             LOGGER.error("No filename pattern provided for FileAppender with name "
                     + name);
             return null;
         }
 
         if (policy == null) {
             LOGGER.error("A TriggeringPolicy must be provided");
             return null;
         }
 
         if (strategy == null) {
             strategy = DefaultRolloverStrategy.createStrategy(null, null,
                     "true", config);
         }
 
         final FastRollingFileManager manager = FastRollingFileManager
                 .getFastRollingFileManager(fileName, filePattern, isAppend,
                         isFlush, policy, strategy, advertiseURI);
         if (manager == null) {
             return null;
         }
 
         if (layout == null) {
             @SuppressWarnings({"unchecked", "UnnecessaryLocalVariable"})
             Layout<S> l = (Layout<S>)PatternLayout.createLayout(null, null, null, null);
             layout = l;
         }
 
         return new FastRollingFileAppender<S>(name, layout, filter, manager,
                 fileName, filePattern, handleExceptions, isFlush,
                 isAdvertise ? config.getAdvertiser() : null);
     }
 }