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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview This class lives on the main thread and takes care of incoming
* logger commands from a worker thread.
*
* @author arv@google.com (Erik Arvidsson)
*/
goog.provide('goog.gears.LoggerServer');
goog.require('goog.Disposable');
goog.require('goog.debug.Logger');
goog.require('goog.debug.Logger.Level');
goog.require('goog.gears.Worker.EventType');
/**
* Creates an object that listens to incoming LOG commands and forwards them
* to a goog.debug.Logger
* @param {goog.gears.Worker} worker The worker thread that
* we are managing the loggers on.
* @param {number} logCommandId The command id used for logging.
* @param {string=} opt_workerName The name of the worker. If present then this
* is added to the log records and to exceptions as {@code workerName}.
* @constructor
* @extends {goog.Disposable}
*/
goog.gears.LoggerServer = function(worker, logCommandId, opt_workerName) {
goog.Disposable.call(this);
/**
* The command id to use to receive log commands from the workers.
* @type {number}
* @private
*/
this.logCommandId_ = logCommandId;
/**
* The worker thread object.
* @type {goog.gears.Worker}
* @private
*/
this.worker_ = worker;
/**
* The name of the worker.
* @type {string}
* @private
*/
this.workerName_ = opt_workerName || '';
/**
* Message prefix containing worker ID.
* @type {string}
* @private
*/
this.msgPrefix_ = '[' + worker.getId() + '] ';
// Listen for command's from the worker to handle the log command.
worker.addEventListener(goog.gears.Worker.EventType.COMMAND,
this.onCommand_, false, this);
};
goog.inherits(goog.gears.LoggerServer, goog.Disposable);
/**
* Whether to show the ID of the worker as a prefix to the shown message.
* @type {boolean}
* @private
*/
goog.gears.LoggerServer.prototype.useMessagePrefix_ = true;
/**
* @return {boolean} * Whether to show the ID of the worker as a prefix to the
* shown message.
*/
goog.gears.LoggerServer.prototype.getUseMessagePrefix = function() {
return this.useMessagePrefix_;
};
/**
* Whether to prefix the message text with the worker ID.
* @param {boolean} b True to prefix the messages.
*/
goog.gears.LoggerServer.prototype.setUseMessagePrefix = function(b) {
this.useMessagePrefix_ = b;
};
/**
* Event handler for the command event of the thread.
* @param {goog.gears.WorkerEvent} e The command event sent by the the
* worker thread.
* @private
*/
goog.gears.LoggerServer.prototype.onCommand_ = function(e) {
var message = /** @type {Array} */ (e.message);
var commandId = message[0];
if (commandId == this.logCommandId_) {
var params = message[1];
var i = 0;
var name = params[i++];
// The old version sent the level name as well. We no longer need it so
// we just step over it.
if (params.length == 5) {
i++;
}
var levelValue = params[i++];
var level = goog.debug.Logger.Level.getPredefinedLevelByValue(levelValue);
if (level) {
var msg = (this.useMessagePrefix_ ? this.msgPrefix_ : '') + params[i++];
var exception = params[i++];
var logger = goog.debug.Logger.getLogger(name);
var logRecord = logger.getLogRecord(level, msg, exception);
if (this.workerName_) {
logRecord.workerName = this.workerName_;
// Note that we happen to know that getLogRecord just references the
// exception object so we can continue to modify it as needed.
if (exception) {
exception.workerName = this.workerName_;
}
}
logger.logRecord(logRecord);
}
// ignore others for now
}
};
/** @override */
goog.gears.LoggerServer.prototype.disposeInternal = function() {
goog.gears.LoggerServer.superClass_.disposeInternal.call(this);
// Remove the event listener.
this.worker_.removeEventListener(
goog.gears.Worker.EventType.COMMAND, this.onCommand_, false, this);
this.worker_ = null;
};
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