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logging/lib/logging.dart

Index: logging/lib/logging.dart
diff --git a/logging/lib/logging.dart b/logging/lib/logging.dart
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-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/**
- */
-library logging;
-
-import 'dart:async';
-import 'dart:collection';
-
-/**
- * Whether to allow fine-grain logging and configuration of loggers in a
- * hierarchy. When false, all logging is merged in the root logger.
- */
-bool hierarchicalLoggingEnabled = false;
-
-/**
- * Automatically record stack traces for any message of this level or above.
- * Because this is expensive, this is off by default.
- */
-Level recordStackTraceAtLevel = Level.OFF;
-
-/**
- * Level for the root-logger. This will be the level of all loggers if
- * [hierarchicalLoggingEnabled] is false.
- */
-Level _rootLevel = Level.INFO;
-
-/**
- * Use a [Logger] to log debug messages. [Logger]s are named using a
- * hierarchical dot-separated name convention.
- */
-class Logger {
-  /** Simple name of this logger. */
-  final String name;
-
-  /** The full name of this logger, which includes the parent's full name. */
-  String get fullName =>
-      (parent == null || parent.name == '') ? name : '${parent.fullName}.$name';
-
-  /** Parent of this logger in the hierarchy of loggers. */
-  final Logger parent;
-
-  /** Logging [Level] used for entries generated on this logger. */
-  Level _level;
-
-  final Map<String, Logger> _children;
-
-  /** Children in the hierarchy of loggers, indexed by their simple names. */
-  final Map<String, Logger> children;
-
-  /** Controller used to notify when log entries are added to this logger. */
-  StreamController<LogRecord> _controller;
-
-  /**
-   * Singleton constructor. Calling `new Logger(name)` will return the same
-   * actual instance whenever it is called with the same string name.
-   */
-  factory Logger(String name) {
-    return _loggers.putIfAbsent(name, () => new Logger._named(name));
-  }
-
-  factory Logger._named(String name) {
-    if (name.startsWith('.')) {
-      throw new ArgumentError("name shouldn't start with a '.'");
-    }
-    // Split hierarchical names (separated with '.').
-    int dot = name.lastIndexOf('.');
-    Logger parent = null;
-    String thisName;
-    if (dot == -1) {
-      if (name != '') parent = new Logger('');
-      thisName = name;
-    } else {
-      parent = new Logger(name.substring(0, dot));
-      thisName = name.substring(dot + 1);
-    }
-    return new Logger._internal(thisName, parent, new Map<String, Logger>());
-  }
-
-  Logger._internal(this.name, this.parent, Map<String, Logger> children)
-      : this._children = children,
-        this.children = new UnmodifiableMapView(children) {
-    if (parent != null) parent._children[name] = this;
-  }
-
-  /**
-   * Effective level considering the levels established in this logger's parents
-   * (when [hierarchicalLoggingEnabled] is true).
-   */
-  Level get level {
-    if (hierarchicalLoggingEnabled) {
-      if (_level != null) return _level;
-      if (parent != null) return parent.level;
-    }
-    return _rootLevel;
-  }
-
-  /** Override the level for this particular [Logger] and its children. */
-  void set level(Level value) {
-    if (hierarchicalLoggingEnabled && parent != null) {
-      _level = value;
-    } else {
-      if (parent != null) {
-        throw new UnsupportedError(
-            'Please set "hierarchicalLoggingEnabled" to true if you want to '
-            'change the level on a non-root logger.');
-      }
-      _rootLevel = value;
-    }
-  }
-
-  /**
-   * Returns an stream of messages added to this [Logger]. You can listen for
-   * messages using the standard stream APIs, for instance:
-   *    logger.onRecord.listen((record) { ... });
-   */
-  Stream<LogRecord> get onRecord => _getStream();
-
-  void clearListeners() {
-    if (hierarchicalLoggingEnabled || parent == null) {
-      if (_controller != null) {
-        _controller.close();
-        _controller = null;
-      }
-    } else {
-      root.clearListeners();
-    }
-  }
-
-  /** Whether a message for [value]'s level is loggable in this logger. */
-  bool isLoggable(Level value) => (value >= level);
-
-  /**
-   * Adds a log record for a [message] at a particular [logLevel] if
-   * `isLoggable(logLevel)` is true.
-   *
-   * Use this method to create log entries for user-defined levels. To record a
-   * message at a predefined level (e.g. [Level.INFO], [Level.WARNING], etc) you
-   * can use their specialized methods instead (e.g. [info], [warning], etc).
-   *
-   * If [message] is a [Function], it will be lazy evaluated. Additionally, if
-   * [message] or its evaluated value is not a [String], then 'toString()' will
-   * be called on it and the result will be logged.
-   *
-   * The log record will contain a field for the zone in which this call was
-   * made.
-   * This can be advantagous if a log listener wants to handle records of
-   * different zones differently (e.g. group log records by http-request if each
-   * http-request handler runs in it's own zone).
-   */
-  void log(Level logLevel, message,
-      [Object error, StackTrace stackTrace, Zone zone]) {
-    if (isLoggable(logLevel)) {
-      if (message is Function) message = message();
-      if (message is! String) message = message.toString();
-      if (stackTrace == null && logLevel >= recordStackTraceAtLevel) {
-        try {
-          throw "autogenerated stack trace for $logLevel $message";
-        } catch (e, t) {
-          stackTrace = t;
-          if (error == null) error = e;
-        }
-      }
-      if (zone == null) zone = Zone.current;
-
-      var record =
-          new LogRecord(logLevel, message, fullName, error, stackTrace, zone);
-
-      if (hierarchicalLoggingEnabled) {
-        var target = this;
-        while (target != null) {
-          target._publish(record);
-          target = target.parent;
-        }
-      } else {
-        root._publish(record);
-      }
-    }
-  }
-
-  /** Log message at level [Level.FINEST]. */
-  void finest(message, [Object error, StackTrace stackTrace]) =>
-      log(Level.FINEST, message, error, stackTrace);
-
-  /** Log message at level [Level.FINER]. */
-  void finer(message, [Object error, StackTrace stackTrace]) =>
-      log(Level.FINER, message, error, stackTrace);
-
-  /** Log message at level [Level.FINE]. */
-  void fine(message, [Object error, StackTrace stackTrace]) =>
-      log(Level.FINE, message, error, stackTrace);
-
-  /** Log message at level [Level.CONFIG]. */
-  void config(message, [Object error, StackTrace stackTrace]) =>
-      log(Level.CONFIG, message, error, stackTrace);
-
-  /** Log message at level [Level.INFO]. */
-  void info(message, [Object error, StackTrace stackTrace]) =>
-      log(Level.INFO, message, error, stackTrace);
-
-  /** Log message at level [Level.WARNING]. */
-  void warning(message, [Object error, StackTrace stackTrace]) =>
-      log(Level.WARNING, message, error, stackTrace);
-
-  /** Log message at level [Level.SEVERE]. */
-  void severe(message, [Object error, StackTrace stackTrace]) =>
-      log(Level.SEVERE, message, error, stackTrace);
-
-  /** Log message at level [Level.SHOUT]. */
-  void shout(message, [Object error, StackTrace stackTrace]) =>
-      log(Level.SHOUT, message, error, stackTrace);
-
-  Stream<LogRecord> _getStream() {
-    if (hierarchicalLoggingEnabled || parent == null) {
-      if (_controller == null) {
-        _controller = new StreamController<LogRecord>.broadcast(sync: true);
-      }
-      return _controller.stream;
-    } else {
-      return root._getStream();
-    }
-  }
-
-  void _publish(LogRecord record) {
-    if (_controller != null) {
-      _controller.add(record);
-    }
-  }
-
-  /** Top-level root [Logger]. */
-  static final Logger root = new Logger('');
-
-  /** All [Logger]s in the system. */
-  static final Map<String, Logger> _loggers = <String, Logger>{};
-}
-
-/** Handler callback to process log entries as they are added to a [Logger]. */
-typedef void LoggerHandler(LogRecord);
-
-/**
- * [Level]s to control logging output. Logging can be enabled to include all
- * levels above certain [Level]. [Level]s are ordered using an integer
- * value [Level.value]. The predefined [Level] constants below are sorted as
- * follows (in descending order): [Level.SHOUT], [Level.SEVERE],
- * [Level.WARNING], [Level.INFO], [Level.CONFIG], [Level.FINE], [Level.FINER],
- * [Level.FINEST], and [Level.ALL].
- *
- * We recommend using one of the predefined logging levels. If you define your
- * own level, make sure you use a value between those used in [Level.ALL] and
- * [Level.OFF].
- */
-class Level implements Comparable<Level> {
-  final String name;
-
-  /**
-   * Unique value for this level. Used to order levels, so filtering can exclude
-   * messages whose level is under certain value.
-   */
-  final int value;
-
-  const Level(this.name, this.value);
-
-  /** Special key to turn on logging for all levels ([value] = 0). */
-  static const Level ALL = const Level('ALL', 0);
-
-  /** Special key to turn off all logging ([value] = 2000). */
-  static const Level OFF = const Level('OFF', 2000);
-
-  /** Key for highly detailed tracing ([value] = 300). */
-  static const Level FINEST = const Level('FINEST', 300);
-
-  /** Key for fairly detailed tracing ([value] = 400). */
-  static const Level FINER = const Level('FINER', 400);
-
-  /** Key for tracing information ([value] = 500). */
-  static const Level FINE = const Level('FINE', 500);
-
-  /** Key for static configuration messages ([value] = 700). */
-  static const Level CONFIG = const Level('CONFIG', 700);
-
-  /** Key for informational messages ([value] = 800). */
-  static const Level INFO = const Level('INFO', 800);
-
-  /** Key for potential problems ([value] = 900). */
-  static const Level WARNING = const Level('WARNING', 900);
-
-  /** Key for serious failures ([value] = 1000). */
-  static const Level SEVERE = const Level('SEVERE', 1000);
-
-  /** Key for extra debugging loudness ([value] = 1200). */
-  static const Level SHOUT = const Level('SHOUT', 1200);
-
-  static const List<Level> LEVELS = const [
-    ALL,
-    FINEST,
-    FINER,
-    FINE,
-    CONFIG,
-    INFO,
-    WARNING,
-    SEVERE,
-    SHOUT,
-    OFF
-  ];
-
-  bool operator ==(other) => other is Level && value == other.value;
-  bool operator <(Level other) => value < other.value;
-  bool operator <=(Level other) => value <= other.value;
-  bool operator >(Level other) => value > other.value;
-  bool operator >=(Level other) => value >= other.value;
-  int compareTo(Level other) => value - other.value;
-  int get hashCode => value;
-  String toString() => name;
-}
-
-/**
- * A log entry representation used to propagate information from [Logger] to
- * individual [Handler]s.
- */
-class LogRecord {
-  final Level level;
-  final String message;
-
-  /** Logger where this record is stored. */
-  final String loggerName;
-
-  /** Time when this record was created. */
-  final DateTime time;
-
-  /** Unique sequence number greater than all log records created before it. */
-  final int sequenceNumber;
-
-  static int _nextNumber = 0;
-
-  /** Associated error (if any) when recording errors messages. */
-  final Object error;
-
-  /** Associated stackTrace (if any) when recording errors messages. */
-  final StackTrace stackTrace;
-
-  /** Zone of the calling code which resulted in this LogRecord. */
-  final Zone zone;
-
-  LogRecord(this.level, this.message, this.loggerName,
-      [this.error, this.stackTrace, this.zone])
-      : time = new DateTime.now(),
-        sequenceNumber = LogRecord._nextNumber++;
-
-  String toString() => '[${level.name}] $loggerName: $message';
-}