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/*
* 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.juli;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.sql.Timestamp;
import java.util.logging.ErrorManager;
import java.util.logging.Filter;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;
import java.util.logging.SimpleFormatter;
/**
* Implementation of Handler that appends log messages to a file
* named {prefix}.{date}.{suffix} in a configured directory, with an
* optional preceding timestamp.
*
* @version $Revision: 483782 $ $Date: 2006-12-07 18:24:30 -0800 (Thu, 07 Dec 2006) $
*/
public class FileHandler
extends Handler {
// ------------------------------------------------------------ Constructor
public FileHandler() {
this(null, null, null);
}
public FileHandler(String directory, String prefix, String suffix) {
this.directory = directory;
this.prefix = prefix;
this.suffix = suffix;
configure();
open();
}
// ----------------------------------------------------- Instance Variables
/**
* The as-of date for the currently open log file, or a zero-length
* string if there is no open log file.
*/
private String date = "";
/**
* The directory in which log files are created.
*/
private String directory = null;
/**
* The prefix that is added to log file filenames.
*/
private String prefix = null;
/**
* The suffix that is added to log file filenames.
*/
private String suffix = null;
/**
* The PrintWriter to which we are currently logging, if any.
*/
private PrintWriter writer = null;
// --------------------------------------------------------- Public Methods
/**
* Format and publish a LogRecord.
*
* @param record description of the log event
*/
public void publish(LogRecord record) {
if (!isLoggable(record)) {
return;
}
// Construct the timestamp we will use, if requested
Timestamp ts = new Timestamp(System.currentTimeMillis());
String tsString = ts.toString().substring(0, 19);
String tsDate = tsString.substring(0, 10);
// If the date has changed, switch log files
if (!date.equals(tsDate)) {
synchronized (this) {
if (!date.equals(tsDate)) {
close();
date = tsDate;
open();
}
}
}
String result = null;
try {
result = getFormatter().format(record);
} catch (Exception e) {
reportError(null, e, ErrorManager.FORMAT_FAILURE);
return;
}
try {
writer.write(result);
writer.flush();
} catch (Exception e) {
reportError(null, e, ErrorManager.WRITE_FAILURE);
return;
}
}
// -------------------------------------------------------- Private Methods
/**
* Close the currently open log file (if any).
*/
public void close() {
try {
if (writer == null)
return;
writer.write(getFormatter().getTail(this));
writer.flush();
writer.close();
writer = null;
date = "";
} catch (Exception e) {
reportError(null, e, ErrorManager.CLOSE_FAILURE);
}
}
/**
* Flush the writer.
*/
public void flush() {
try {
writer.flush();
} catch (Exception e) {
reportError(null, e, ErrorManager.FLUSH_FAILURE);
}
}
/**
* Configure from LogManager properties.
*/
private void configure() {
Timestamp ts = new Timestamp(System.currentTimeMillis());
String tsString = ts.toString().substring(0, 19);
date = tsString.substring(0, 10);
String className = FileHandler.class.getName();
ClassLoader cl = Thread.currentThread().getContextClassLoader();
// Retrieve configuration of logging file name
if (directory == null)
directory = getProperty(className + ".directory", "logs");
if (prefix == null)
prefix = getProperty(className + ".prefix", "juli.");
if (suffix == null)
suffix = getProperty(className + ".suffix", ".log");
// Get logging level for the handler
setLevel(Level.parse(getProperty(className + ".level", "" + Level.ALL)));
// Get filter configuration
String filterName = getProperty(className + ".filter", null);
if (filterName != null) {
try {
setFilter((Filter) cl.loadClass(filterName).newInstance());
} catch (Exception e) {
// Ignore
}
}
// Set formatter
String formatterName = getProperty(className + ".formatter", null);
if (formatterName != null) {
try {
setFormatter((Formatter) cl.loadClass(formatterName).newInstance());
} catch (Exception e) {
// Ignore
}
} else {
setFormatter(new SimpleFormatter());
}
// Set error manager
setErrorManager(new ErrorManager());
}
private String getProperty(String name, String defaultValue) {
String value = LogManager.getLogManager().getProperty(name);
if (value == null) {
value = defaultValue;
} else {
value = value.trim();
}
return value;
}
/**
* Open the new log file for the date specified by date.
*/
private void open() {
// Create the directory if necessary
File dir = new File(directory);
dir.mkdirs();
// Open the current log file
try {
String pathname = dir.getAbsolutePath() + File.separator +
prefix + date + suffix;
writer = new PrintWriter(new FileWriter(pathname, true), true);
writer.write(getFormatter().getHead(this));
} catch (Exception e) {
reportError(null, e, ErrorManager.OPEN_FAILURE);
writer = null;
}
}
}
