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package org.apache.catalina.logger;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Timestamp;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.util.LifecycleSupport;
import org.apache.catalina.util.StringManager;
/**
* Implementation of <b>Logger</b> that appends log messages to a file
* named {prefix}.{date}.{suffix} in a configured directory, with an
* optional preceding timestamp.
*
* @author Craig R. McClanahan
* @version $Revision: 1.4 $ $Date: 2007/05/05 05:32:09 $
*/
public class FileLogger
extends LoggerBase {
// ----------------------------------------------------- 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 = "logs";
/**
* The descriptive information about this implementation.
*/
protected static final String info =
"org.apache.catalina.logger.FileLogger/1.0";
/**
* The prefix that is added to log file filenames.
*/
private String prefix = "catalina.";
/**
* The string manager for this package.
*/
private StringManager sm =
StringManager.getManager(Constants.Package);
/**
* Has this component been started?
*/
private boolean started = false;
/**
* The suffix that is added to log file filenames.
*/
private String suffix = ".log";
/**
* Should logged messages be date/time stamped?
*/
private boolean timestamp = false;
/**
* The PrintWriter to which we are currently logging, if any.
*/
private PrintWriter writer = null;
// ------------------------------------------------------------- Properties
/**
* Return the directory in which we create log files.
*/
public String getDirectory() {
return (directory);
}
/**
* Set the directory in which we create log files.
*
* @param directory The new log file directory
*/
public void setDirectory(String directory) {
String oldDirectory = this.directory;
this.directory = directory;
support.firePropertyChange("directory", oldDirectory, this.directory);
}
/**
* Return the log file prefix.
*/
public String getPrefix() {
return (prefix);
}
/**
* Set the log file prefix.
*
* @param prefix The new log file prefix
*/
public void setPrefix(String prefix) {
String oldPrefix = this.prefix;
this.prefix = prefix;
support.firePropertyChange("prefix", oldPrefix, this.prefix);
}
/**
* Return the log file suffix.
*/
public String getSuffix() {
return (suffix);
}
/**
* Set the log file suffix.
*
* @param suffix The new log file suffix
*/
public void setSuffix(String suffix) {
String oldSuffix = this.suffix;
this.suffix = suffix;
support.firePropertyChange("suffix", oldSuffix, this.suffix);
}
/**
* Return the timestamp flag.
*/
public boolean getTimestamp() {
return (timestamp);
}
/**
* Set the timestamp flag.
*
* @param timestamp The new timestamp flag
*/
public void setTimestamp(boolean timestamp) {
boolean oldTimestamp = this.timestamp;
this.timestamp = timestamp;
support.firePropertyChange("timestamp", Boolean.valueOf(oldTimestamp),
Boolean.valueOf(this.timestamp));
}
// --------------------------------------------------------- Public Methods
/**
* Writes the specified message to a servlet log file, usually an event
* log. The name and type of the servlet log is specific to the
* servlet container.
*
* @param msg A <code>String</code> specifying the message to be written
* to the log file
*/
public void log(String msg) {
// 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();
}
}
}
// Log this message, timestamped if necessary
if (writer != null) {
if (timestamp) {
writer.println(tsString + " " + msg);
} else {
writer.println(msg);
}
}
}
// -------------------------------------------------------- Private Methods
/**
* Close the currently open log file (if any)
*/
private void close() {
if (writer == null)
return;
writer.flush();
writer.close();
writer = null;
date = "";
}
/**
* Open the new log file for the date specified by <code>date</code>.
*/
private void open() {
// Create the directory if necessary
File dir = new File(directory);
if (!dir.isAbsolute())
dir = new File(System.getProperty("catalina.base"), 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);
} catch (IOException e) {
writer = null;
}
}
// ------------------------------------------------------ Lifecycle Methods
/**
* Prepare for the beginning of active use of the public methods of this
* component. This method should be called after <code>configure()</code>,
* and before any of the public methods of the component are utilized.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
public void start() throws LifecycleException {
// Validate and update our current component state
if (started)
throw new LifecycleException
(sm.getString("fileLogger.alreadyStarted"));
lifecycle.fireLifecycleEvent(START_EVENT, null);
started = true;
super.start();
}
/**
* Gracefully terminate the active use of the public methods of this
* component. This method should be the last one called on a given
* instance of this component.
*
* @exception LifecycleException if this component detects a fatal error
* that needs to be reported
*/
public void stop() throws LifecycleException {
// Validate and update our current component state
if (!started)
throw new LifecycleException
(sm.getString("fileLogger.notStarted"));
lifecycle.fireLifecycleEvent(STOP_EVENT, null);
started = false;
close();
super.stop();
}
}
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