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Log Parser

read any java log format and process it

Why?

... because i did need it:)

Howto

This will need Java 7 runtime, because of the used file io enhancement and java regex named group support.

Maven

Stable (Maven Central Repository, Released: 09.04.2013 - wait 24hrs for maven central)

<dependency>
	<groupId>de.flapdoodle</groupId>
	<artifactId>de.flapdoodle.logparser</artifactId>
	<version>1.1</version>
</dependency>

Snapshots (Repository http://oss.sonatype.org/content/repositories/snapshots)

<dependency>
	<groupId>de.flapdoodle</groupId>
	<artifactId>de.flapdoodle.logparser</artifactId>
	<version>1.2-SNAPSHOT</version>
</dependency>

Changelog

1.2 (SNAPSHOT)

• documentation enhancement

1.1

• major refactoring
• multi line message stacktrace support

1.0

• can handle standard java logging and some custom logback format
• supports stack trace parsing

Usage

With this library it should be easy to setup a parser for most common and custom log files The following examples will show how you can do this.

Simple LogFile

This is how you can parse a simple logfile (with stacktrace support). In this example the logfile can look like this:

2013-04-07 00:00:01 INFO: Everything is fine
2013-04-07 00:00:01 ERROR: Something went wrong
de.flapdoodle.BadCaseException: wo should stop right now
	at de.flapdoodle.HarmlessComponent.simpleMethod(HarmlessComponent.java:123)
	at de.flapdoodle.Main.main(Main.java:12)
Caused by: java.lang.NullPointerException: null
	at de.flapdoodle.stuff.ReachTheStarAdapter.reach(ReachTheStarAdapter.java:123456)
	at de.flapdoodle.stuff.ReachSomething.reach(ReachSomething.java:123456)
	... 64 common frames omitted

...
String regex = "(?<date>\\d+-\\d\\d-\\d\\d \\d\\d:\\d\\d:\\d\\d) (?<level>[A-Z]+): (?<message>.*)$";
Pattern firstLinePattern = Pattern.compile(regex);
GenericLogMatcher genericLogMatcher = new GenericLogMatcher(firstLinePattern);

List<IMatcher<LogEntry>> matchers = Lists.<IMatcher<LogEntry>> newArrayList(genericLogMatcher);

IStreamListener<LogEntry> streamListener = collectingStreamListener;
ILineProcessor lineProcessor = writeToListLineProcessor;

StreamProcessor<LogEntry> streamProcessor = new StreamProcessor<LogEntry>(matchers, lineProcessor, streamListener);
...
...
int readAheadLimit = 1024;
IRewindableReader reader = new BufferedReaderAdapter(inputStream, Charsets.UTF_8, readAheadLimit);
streamProcessor.process(reader);
...