import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
private RollingRandomAccessFileAppender(final String name, final Layout<? extends Serializable> layout,
        final Filter filter, final RollingFileManager manager, final String fileName,
        final String filePattern, 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<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;
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
/**
 * Creates a new {@link RollingFileAppender}
 * @param fileName The log file
 * @param loggingConfig The logging config
 * @param layout The layout
 * @param strategy the rollover strategy
 * @param rolledFileFormat The log file roll pattern
 * @param trigger The roll trigger
 * @return the new appender
 */
protected Appender createRollingFileAppender(final String fileName, Configuration loggingConfig, PatternLayout layout,
		final DefaultRolloverStrategy strategy, final String rolledFileFormat, final TriggeringPolicy trigger) {
       RollingFileManager fileManager = RollingFileManager.getFileManager(
       		fileName, 
       		rolledFileFormat, 
       		false, 
       		true,
       		trigger, 
       		strategy, 
       		null, 
       		layout, 
       		8192,
       		true
       		);
       trigger.initialize(fileManager);
	
	return RollingFileAppender.createAppender(
			fileName, 						// file name
			rolledFileFormat, 				// rolled file name pattern
			"true", 						// append
			getClass().getSimpleName(), 	// appender name
			"true", 						// buffered io
			"8192", 						// buffer size
			"true", 						// immediate flush	
			trigger, 						// triggering policy
			strategy,						// rollover strategy
			layout, 						// layout
			null, 							// filter
			"true",							// ignore exceptions 
			null, 							// advertise
			null, 							// advertise uri
			loggingConfig);					// config
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
/**
 * Perform the rollover.
 * @param manager The RollingFileManager name for current active log file.
 * @return A RolloverDescription.
 * @throws SecurityException if an error occurs.
 */
@Override
public RolloverDescription rollover(final RollingFileManager manager) throws SecurityException {
    if (maxIndex < 0) {
        return null;
    }
    final long start = System.nanoTime();
    final int fileIndex = purge(minIndex, maxIndex, manager);
    if (fileIndex < 0) {
        return null;
    }
    if (LOGGER.isTraceEnabled()) {
        final double duration = (System.nanoTime() - start) / (1000.0 * 1000.0 * 1000.0);
        LOGGER.trace("DefaultRolloverStrategy.purge() took {} seconds", duration);
    }
    final StringBuilder buf = new StringBuilder(255);
    manager.getPatternProcessor().formatFileName(subst, buf, fileIndex);
    final String currentFileName = manager.getFileName();

    String renameTo = buf.toString();
    final String compressedName = renameTo;
    Action compressAction = null;

    if (renameTo.endsWith(EXT_GZIP)) {
        renameTo = renameTo.substring(0, renameTo.length() - EXT_GZIP.length());
        compressAction = new GzCompressAction(new File(renameTo), new File(compressedName), true);
    } else if (renameTo.endsWith(EXT_ZIP)) {
        renameTo = renameTo.substring(0, renameTo.length() - EXT_ZIP.length());
        compressAction = new ZipCompressAction(new File(renameTo), new File(compressedName), true,
                compressionLevel);
    }

    final FileRenameAction renameAction =
            new FileRenameAction(new File(currentFileName), new File(renameTo), false);

    return new RolloverDescriptionImpl(currentFileName, false, renameAction, compressAction);
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
private RollingFileAppender(final String name, final Layout<? extends Serializable> layout, final Filter filter,
                            final RollingFileManager manager, final String fileName,
                            final String filePattern, 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<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;
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
private RollingFileAppender(final String name, final Layout<? extends Serializable> layout, final Filter filter,
        final RollingFileManager manager, final String fileName, final String filePattern,
        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.put("contentType", layout.getContentType());
        configuration.put("name", name);
        advertisement = advertiser.advertise(configuration);
    }
    this.fileName = fileName;
    this.filePattern = filePattern;
    this.advertiser = advertiser;
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
@Override
public final void initialize(final RollingFileManager manager) {
	this.manager = manager;
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
private int purge(final int lowIndex, final int highIndex, final RollingFileManager manager) {
    return useMax ? purgeAscending(lowIndex, highIndex, manager) :
            purgeDescending(lowIndex, highIndex, manager);
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
/**
 * Write the log entry rolling over the file when required.

 * @param event The LogEvent.
 */
@Override
public void append(final LogEvent event) {
    ((RollingFileManager) getManager()).checkRollover(event);
    super.append(event);
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
/**
 * Create a RollingFileAppender.
 * @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 bufferedIO When true, I/O will be buffered. Defaults to "true".
 * @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 ignore If {@code "true"} (default) exceptions encountered when appending events are logged; otherwise
 *               they are propagated to the caller.
 * @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 RollingFileAppender.
 */
@PluginFactory
public static RollingFileAppender createAppender(
        @PluginAttribute("fileName") final String fileName,
        @PluginAttribute("filePattern") final String filePattern,
        @PluginAttribute("append") final String append,
        @PluginAttribute("name") final String name,
        @PluginAttribute("bufferedIO") final String bufferedIO,
        @PluginAttribute("immediateFlush") final String immediateFlush,
        @PluginElement("Policy") final TriggeringPolicy policy,
        @PluginElement("Strategy") RolloverStrategy strategy,
        @PluginElement("Layout") Layout<? extends Serializable> layout,
        @PluginElement("Filter") final Filter filter,
        @PluginAttribute("ignoreExceptions") final String ignore,
        @PluginAttribute("advertise") final String advertise,
        @PluginAttribute("advertiseURI") final String advertiseURI,
        @PluginConfiguration final Configuration config) {

    final boolean isAppend = Booleans.parseBoolean(append, true);
    final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
    final boolean isBuffered = Booleans.parseBoolean(bufferedIO, true);
    final boolean isFlush = Booleans.parseBoolean(immediateFlush, true);
    final boolean isAdvertise = Boolean.parseBoolean(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, null,
                String.valueOf(Deflater.DEFAULT_COMPRESSION), config);
    }

    if (layout == null) {
        layout = PatternLayout.createLayout(null, null, null, null, null);
    }

    final RollingFileManager manager = RollingFileManager.getFileManager(fileName, filePattern, isAppend,
        isBuffered, policy, strategy, advertiseURI, layout);
    if (manager == null) {
        return null;
    }

    return new RollingFileAppender(name, layout, filter, manager, fileName, filePattern,
            ignoreExceptions, isFlush, isAdvertise ? config.getAdvertiser() : null);
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
@Override
public RollingFileAppender build() {
    // Even though some variables may be annotated with @Required, we must still perform validation here for
    // call sites that build builders programmatically.
    final boolean isBufferedIo = isBufferedIo();
    final int bufferSize = getBufferSize();
    if (getName() == null) {
        LOGGER.error("RollingFileAppender '{}': No name provided.", getName());
        return null;
    }

    if (!isBufferedIo && bufferSize > 0) {
        LOGGER.warn("RollingFileAppender '{}': The bufferSize is set to {} but bufferedIO is not true", getName(), bufferSize);
    }

    if (filePattern == null) {
        LOGGER.error("RollingFileAppender '{}': No file name pattern provided.", getName());
        return null;
    }

    if (policy == null) {
        LOGGER.error("RollingFileAppender '{}': No TriggeringPolicy provided.", getName());
        return null;
    }

    if (strategy == null) {
        if (fileName != null) {
            strategy = DefaultRolloverStrategy.newBuilder()
                                .withCompressionLevelStr(String.valueOf(Deflater.DEFAULT_COMPRESSION))
                                .withConfig(getConfiguration())
                                .build();
        } else {
            strategy = DirectWriteRolloverStrategy.newBuilder()
                                .withCompressionLevelStr(String.valueOf(Deflater.DEFAULT_COMPRESSION))
                                .withConfig(getConfiguration())
                                .build();
        }
    } else if (fileName == null && !(strategy instanceof DirectFileRolloverStrategy)) {
        LOGGER.error("RollingFileAppender '{}': When no file name is provided a DirectFilenameRolloverStrategy must be configured");
        return null;
    }

    final Layout<? extends Serializable> layout = getOrCreateLayout();
    final RollingFileManager manager = RollingFileManager.getFileManager(fileName, filePattern, append,
            isBufferedIo, policy, strategy, advertiseUri, layout, bufferSize, isImmediateFlush(),
            createOnDemand, filePermissions, fileOwner, fileGroup, getConfiguration());
    if (manager == null) {
        return null;
    }

    manager.initialize();

    return new RollingFileAppender(getName(), layout, getFilter(), manager, fileName, filePattern,
            isIgnoreExceptions(), isImmediateFlush(), advertise ? getConfiguration().getAdvertiser() : null);
}
 

import org.apache.logging.log4j.core.appender.rolling.RollingFileManager; //导入依赖的package包/类
@Override
public void initialize(RollingFileManager rfm) {
	
}