/*
    * 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 java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  
  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.config.Configuration;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
  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 org.apache.logging.log4j.core.util.Booleans;
  import org.apache.logging.log4j.core.util.Integers;
  
  /**
   * File Appender.
   */
  @Plugin(name = "RandomAccessFile", category = "Core", elementType = "appender", printObject = true)
  public final class RandomAccessFileAppender extends AbstractOutputStreamAppender<RandomAccessFileManager> {
  
      private static final long serialVersionUID = 1L;
  
      private final String fileName;
      private Object advertisement;
      private final Advertiser advertiser;
  
      private RandomAccessFileAppender(final String name, final Layout<? extends Serializable> layout,
              final Filter filter, final RandomAccessFileManager manager, final String filename,
              final boolean ignoreExceptions, final boolean immediateFlush, final Advertiser advertiser) {
          
          super(name, layout, filter, ignoreExceptions, immediateFlush, manager);
          if (advertiser != null) {
              final Map<String, String> configuration = new HashMap<>(
                      layout.getContentFormat());
              configuration.putAll(manager.getContentFormat());
              configuration.put("contentType", layout.getContentType());
              configuration.put("name", name);
              advertisement = advertiser.advertise(configuration);
          }
          this.fileName = filename;
          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) {
  
          // 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.
          getManager().setEndOfBatch(event.isEndOfBatch());
          super.append(event);
      }
  
      /**
       * Returns the file name this appender is associated with.
       *
       * @return The File name.
       */
      public String getFileName() {
          return this.fileName;
      }
     
     /**
      * Returns the size of the file manager's buffer.
      * @return the buffer size
      */
     public int getBufferSize() {
         return getManager().getBufferSize();
     }
 
     // difference from standard File Appender:
     // locking is not supported and buffering cannot be switched off
     /**
      * Create a File Appender.
      *
      * @param fileName The name and path of the file.
      * @param append "True" if the file should be appended to, "false" if it
      *            should be overwritten. The default is "true".
      * @param name The name of the Appender.
      * @param immediateFlush "true" if the contents should be flushed on every
      *            write, "false" otherwise. The default is "true".
      * @param bufferSizeStr The buffer size, defaults to {@value RandomAccessFileManager#DEFAULT_BUFFER_SIZE}.
      * @param ignore If {@code "true"} (default) exceptions encountered when appending events are logged; otherwise
      *               they are propagated to the caller.
      * @param layout The layout to use to format the event. If no layout is
      *            provided the default PatternLayout will be used.
      * @param filter The filter, if any, to use.
      * @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 The FileAppender.
      */
     @PluginFactory
     public static RandomAccessFileAppender createAppender(
             @PluginAttribute("fileName") final String fileName,
             @PluginAttribute("append") final String append,
             @PluginAttribute("name") final String name,
             @PluginAttribute("immediateFlush") final String immediateFlush,
             @PluginAttribute("bufferSize") final String bufferSizeStr,
             @PluginAttribute("ignoreExceptions") final String ignore,
             @PluginElement("Layout") Layout<? extends Serializable> layout,
             @PluginElement("Filter") final Filter filter,
             @PluginAttribute("advertise") final String advertise,
             @PluginAttribute("advertiseURI") final String advertiseURI,
             @PluginConfiguration final Configuration config) {
 
         final boolean isAppend = Booleans.parseBoolean(append, true);
         final boolean isFlush = Booleans.parseBoolean(immediateFlush, true);
         final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
         final boolean isAdvertise = Boolean.parseBoolean(advertise);
         final int bufferSize = Integers.parseInt(bufferSizeStr, RandomAccessFileManager.DEFAULT_BUFFER_SIZE);
 
         if (name == null) {
             LOGGER.error("No name provided for FileAppender");
             return null;
         }
 
         if (fileName == null) {
             LOGGER.error("No filename provided for FileAppender with name "
                     + name);
             return null;
         }
         if (layout == null) {
             layout = PatternLayout.createDefaultLayout();
         }
         final RandomAccessFileManager manager = RandomAccessFileManager.getFileManager(
                 fileName, isAppend, isFlush, bufferSize, advertiseURI, layout
         );
         if (manager == null) {
             return null;
         }
 
         return new RandomAccessFileAppender(
                 name, layout, filter, manager, fileName, ignoreExceptions, isFlush,
                 isAdvertise ? config.getAdvertiser() : null
         );
     }
 }