Package org.apache.juneau.microservice.resources

Class LogEntryFormatter

java.lang.Object

java.util.logging.Formatter

org.apache.juneau.microservice.resources.LogEntryFormatter

public class LogEntryFormatter
extends Formatter

Log entry formatter.

Uses three simple parameter for configuring log entry formats:

• dateFormat - A SimpleDateFormat string describing the format for dates.
• format - A string with {...} replacement variables representing predefined fields.
• useStackTraceHashes - A setting that causes duplicate stack traces to be replaced with 8-character hash strings.

This class converts the format strings into a regular expression that can be used to parse the resulting log file.

Constructor Summary

Constructors

Constructor	Description
LogEntryFormatter(String format, String dateFormat, boolean useStackTraceHashes)	Create a new formatter.

Method Summary

Modifier and Type	Method	Description
String	format(LogRecord r)
DateFormat	getDateFormat()	Returns the DateFormat used for matching dates.
String	getField(String fieldName, Matcher m)	Given a matcher that has matched the pattern specified by getLogEntryPattern(), returns the field value from the match.
Pattern	getLogEntryPattern()	Returns the regular expression pattern used for matching log entries.

Methods inherited from class java.util.logging.Formatter

formatMessage, getHead, getTail

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

LogEntryFormatter

public LogEntryFormatter(String format,
 String dateFormat,
 boolean useStackTraceHashes)

Create a new formatter.

Parameters:

format - The log entry format. e.g. "[{date} {level}] {msg}%n" The string can contain any of the following variables:

1. "{date}" - The date, formatted per "Logging/dateFormat".
2. "{class}" - The class name.
3. "{method}" - The method name.
4. "{logger}" - The logger name.
5. "{level}" - The log level name.
6. "{msg}" - The log message.
7. "{threadid}" - The thread ID.
8. "{exception}" - The localized exception message.

dateFormat - The SimpleDateFormat format to use for dates. e.g. "yyyy.MM.dd hh:mm:ss".

useStackTraceHashes - If true, only print unique stack traces once and then refer to them by a simple 8 character hash identifier.

Method Details

getLogEntryPattern

public Pattern getLogEntryPattern()

Returns the regular expression pattern used for matching log entries.

Returns:

The regular expression pattern used for matching log entries.

getDateFormat

public DateFormat getDateFormat()

Returns the DateFormat used for matching dates.

Returns:

The DateFormat used for matching dates.

getField

public String getField(String fieldName,
 Matcher m)

Given a matcher that has matched the pattern specified by getLogEntryPattern(), returns the field value from the match.

Parameters:

fieldName - The field name. Possible values are:

• "date"
• "class"
• "method"
• "logger"
• "level"
• "msg"
• "threadid"
• "exception"

m - The matcher.

Returns:

The field value, or null if the specified field does not exist.

format

public String format(LogRecord r)

Specified by:

format in class Formatter