| commit | d67fbc62d1c4bf2f884c1b87f678a15fbf11cd20 | [log] [tgz] |
|---|---|---|
| author | kevmoo@google.com <kevmoo@google.com> | Thu Jul 24 17:44:30 2014 +0000 |
| committer | kevmoo@google.com <kevmoo@google.com> | Thu Jul 24 17:44:30 2014 +0000 |
| tree | bd1d3ccbd27df4a52b72a0f8839e36fd6da0d03a | |
| parent | a834d1664a2de8f369689b4011f48e1b6034a1ae [diff] |
pkg/logging: use UnmodifiableMapView from dart:collection remove documentation URL remove (now) unused collection pkg import move intro docs to README.md R=sethladd@google.com Review URL: https://codereview.chromium.org//413193002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/logging@38546 260f80e4-7a28-3924-810f-c04153c831b5
By default, the logging package does not do anything useful with the log messages. You must configure the logging level and add a handler for the log messages.
Here is a simple logging configuration that logs all messages via print.
Logger.root.level = Level.ALL; Logger.root.onRecord.listen((LogRecord rec) { print('${rec.level.name}: ${rec.time}: ${rec.message}'); });
First, set the root [Level]. All messages at or above the level are sent to the [onRecord] stream.
Then, listen on the [onRecord] stream for [LogRecord] events. The [LogRecord] class has various properties for the message, error, logger name, and more.
Create a [Logger] with a unique name to easily identify the source of the log messages.
final Logger log = new Logger('MyClassName');
Here is an example of logging a debug message and an error:
var future = doSomethingAsync().then((result) { log.fine('Got the result: $result'); processResult(result); }).catchError((e, stackTrace) => log.severe('Oh noes!', e, stackTrace));
See the [Logger] class for the different logging methods.