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<?php
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*
* @package log4php
*/
/**
* This class is specialized in retrieving loggers by name and also maintaining
* the logger hierarchy. The logger hierarchy is dealing with the several Log-Levels
* Logger can have. From log4j website:
*
* "A logger is said to be an ancestor of another logger if its name followed
* by a dot is a prefix of the descendant logger name. A logger is said to be
* a parent of a child logger if there are no ancestors between itself and the
* descendant logger."
*
* Child Loggers do inherit their Log-Levels from their Ancestors. They can
* increase their Log-Level compared to their Ancestors, but they cannot decrease it.
*
* <p>The casual user does not have to deal with this class directly.</p>
*
* <p>The structure of the logger hierarchy is maintained by the
* getLogger method. The hierarchy is such that children link
* to their parent but parents do not have any pointers to their
* children. Moreover, loggers can be instantiated in any order, in
* particular descendant before ancestor.</p>
*
* <p>In case a descendant is created before a particular ancestor,
* then it creates a provision node for the ancestor and adds itself
* to the provision node. Other descendants of the same ancestor add
* themselves to the previously created provision node.</p>
*
* @version $Revision: 1394956 $
* @package log4php
*/
class LoggerHierarchy {
/** Array holding all Logger instances. */
protected $loggers = array();
/**
* The root logger.
* @var RootLogger
*/
protected $root;
/**
* The logger renderer map.
* @var LoggerRendererMap
*/
protected $rendererMap;
/**
* Main level threshold. Events with lower level will not be logged by any
* logger, regardless of it's configuration.
* @var LoggerLevel
*/
protected $threshold;
/**
* Creates a new logger hierarchy.
* @param LoggerRoot $root The root logger.
*/
public function __construct(LoggerRoot $root) {
$this->root = $root;
$this->setThreshold(LoggerLevel::getLevelAll());
$this->rendererMap = new LoggerRendererMap();
}
/**
* Clears all loggers.
*/
public function clear() {
$this->loggers = array();
}
/**
* Check if the named logger exists in the hierarchy.
* @param string $name
* @return boolean
*/
public function exists($name) {
return isset($this->loggers[$name]);
}
/**
* Returns all the currently defined loggers in this hierarchy as an array.
* @return array
*/
public function getCurrentLoggers() {
return array_values($this->loggers);
}
/**
* Returns a named logger instance logger. If it doesn't exist, one is created.
*
* @param string $name Logger name
* @return Logger Logger instance.
*/
public function getLogger($name) {
if(!isset($this->loggers[$name])) {
$logger = new Logger($name);
$nodes = explode('.', $name);
$firstNode = array_shift($nodes);
// if name is not a first node but another first node is their
if($firstNode != $name and isset($this->loggers[$firstNode])) {
$logger->setParent($this->loggers[$firstNode]);
} else {
// if there is no father, set root logger as father
$logger->setParent($this->root);
}
// if there are more nodes than one
if(count($nodes) > 0) {
// find parent node
foreach($nodes as $node) {
$parentNode = "$firstNode.$node";
if(isset($this->loggers[$parentNode]) and $parentNode != $name) {
$logger->setParent($this->loggers[$parentNode]);
}
$firstNode .= ".$node";
}
}
$this->loggers[$name] = $logger;
}
return $this->loggers[$name];
}
/**
* Returns the logger renderer map.
* @return LoggerRendererMap
*/
public function getRendererMap() {
return $this->rendererMap;
}
/**
* Returns the root logger.
* @return LoggerRoot
*/
public function getRootLogger() {
return $this->root;
}
/**
* Returns the main threshold level.
* @return LoggerLevel
*/
public function getThreshold() {
return $this->threshold;
}
/**
* Returns true if the hierarchy is disabled for given log level and false
* otherwise.
* @return boolean
*/
public function isDisabled(LoggerLevel $level) {
return ($this->threshold->toInt() > $level->toInt());
}
/**
* Reset all values contained in this hierarchy instance to their
* default.
*
* This removes all appenders from all loggers, sets
* the level of all non-root loggers to <i>null</i>,
* sets their additivity flag to <i>true</i> and sets the level
* of the root logger to {@link LOGGER_LEVEL_DEBUG}.
*
* <p>Existing loggers are not removed. They are just reset.
*
* <p>This method should be used sparingly and with care as it will
* block all logging until it is completed.</p>
*/
public function resetConfiguration() {
$root = $this->getRootLogger();
$root->setLevel(LoggerLevel::getLevelDebug());
$this->setThreshold(LoggerLevel::getLevelAll());
$this->shutDown();
foreach($this->loggers as $logger) {
$logger->setLevel(null);
$logger->setAdditivity(true);
$logger->removeAllAppenders();
}
$this->rendererMap->reset();
LoggerAppenderPool::clear();
}
/**
* Sets the main threshold level.
* @param LoggerLevel $l
*/
public function setThreshold(LoggerLevel $threshold) {
$this->threshold = $threshold;
}
/**
* Shutting down a hierarchy will <i>safely</i> close and remove
* all appenders in all loggers including the root logger.
*
* The shutdown method is careful to close nested
* appenders before closing regular appenders. This is allows
* configurations where a regular appender is attached to a logger
* and again to a nested appender.
*
* @todo Check if the last paragraph is correct.
*/
public function shutdown() {
$this->root->removeAllAppenders();
foreach($this->loggers as $logger) {
$logger->removeAllAppenders();
}
}
/**
* Prints the current Logger hierarchy tree. Useful for debugging.
*/
public function printHierarchy() {
$this->printHierarchyInner($this->getRootLogger(), 0);
}
private function printHierarchyInner(Logger $current, $level) {
for ($i = 0; $i < $level; $i++) {
echo ($i == $level - 1) ? "|--" : "| ";
}
echo $current->getName() . "\n";
foreach($this->loggers as $logger) {
if ($logger->getParent() == $current) {
$this->printHierarchyInner($logger, $level + 1);
}
}
}
}