library/log4php/LoggerAppender.php
author Markus Broeker<broeker.markus@googlemail.com>
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<?php
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/**
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements. See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License. You may obtain a copy of the License at
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 *
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 *        http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 *
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 * @package log4php
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 */
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/**
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 * Abstract class that defines output logs strategies.
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 *
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 * @version $Revision: 1374777 $
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 * @package log4php
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 */
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abstract class LoggerAppender extends LoggerConfigurable {
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    /**
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     * Set to true when the appender is closed. A closed appender will not
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     * accept any logging requests.
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     * @var boolean
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     */
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    protected $closed = false;
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    /**
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     * The first filter in the filter chain.
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     * @var LoggerFilter
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     */
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    protected $filter;
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    /**
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     * The appender's layout. Can be null if the appender does not use
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     * a layout.
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     * @var LoggerLayout
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     */
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    protected $layout;
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    /**
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     * Appender name. Used by other components to identify this appender.
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     * @var string
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     */
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    protected $name;
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    /**
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     * Appender threshold level. Events whose level is below the threshold
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     * will not be logged.
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     * @var LoggerLevel
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     */
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    protected $threshold;
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    /**
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     * Set to true if the appender requires a layout.
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     *
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     * True by default, appenders which do not use a layout should override
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     * this property to false.
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     *
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     * @var boolean
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     */
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    protected $requiresLayout = true;
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    /**
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     * Default constructor.
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     * @param string $name Appender name
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     */
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    public function __construct($name = '') {
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        $this->name = $name;
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        if ($this->requiresLayout) {
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            $this->layout = $this->getDefaultLayout();
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        }
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    }
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    public function __destruct() {
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        $this->close();
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    }
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    /**
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     * Returns the default layout for this appender. Can be overriden by
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     * derived appenders.
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     *
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     * @return LoggerLayout
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     */
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    public function getDefaultLayout() {
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        return new LoggerLayoutSimple();
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    }
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    /**
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     * Adds a filter to the end of the filter chain.
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     * @param LoggerFilter $filter add a new LoggerFilter
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     */
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    public function addFilter($filter) {
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        if ($this->filter === null) {
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            $this->filter = $filter;
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        } else {
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            $this->filter->addNext($filter);
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        }
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    }
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    /**
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     * Clears the filter chain by removing all the filters in it.
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     */
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    public function clearFilters() {
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        $this->filter = null;
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    }
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    /**
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     * Returns the first filter in the filter chain.
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     * The return value may be <i>null</i> if no is filter is set.
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     * @return LoggerFilter
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     */
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    public function getFilter() {
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        return $this->filter;
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    }
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    /**
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     * Returns the first filter in the filter chain.
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     * The return value may be <i>null</i> if no is filter is set.
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     * @return LoggerFilter
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     */
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    public function getFirstFilter() {
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        return $this->filter;
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    }
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    /**
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     * Performs threshold checks and invokes filters before delegating logging
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     * to the subclass' specific <i>append()</i> method.
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     * @see LoggerAppender::append()
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     * @param LoggerLoggingEvent $event
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     */
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    public function doAppend(LoggerLoggingEvent $event) {
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        if ($this->closed) {
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            return;
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        }
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        if (!$this->isAsSevereAsThreshold($event->getLevel())) {
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            return;
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        }
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        $filter = $this->getFirstFilter();
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        while ($filter !== null) {
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            switch ($filter->decide($event)) {
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                case LoggerFilter::DENY:
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                    return;
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                case LoggerFilter::ACCEPT:
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                    return $this->append($event);
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                case LoggerFilter::NEUTRAL:
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                    $filter = $filter->getNext();
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            }
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        }
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        $this->append($event);
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    }
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    /**
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     * Sets the appender layout.
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     * @param LoggerLayout $layout
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     */
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    public function setLayout($layout) {
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        if ($this->requiresLayout()) {
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            $this->layout = $layout;
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        }
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    }
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    /**
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     * Returns the appender layout.
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     * @return LoggerLayout
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     */
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    public function getLayout() {
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        return $this->layout;
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    }
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    /**
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     * Configurators call this method to determine if the appender
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     * requires a layout.
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     *
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     * <p>If this method returns <i>true</i>, meaning that layout is required,
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     * then the configurator will configure a layout using the configuration
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     * information at its disposal.     If this method returns <i>false</i>,
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     * meaning that a layout is not required, then layout configuration will be
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     * skipped even if there is available layout configuration
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     * information at the disposal of the configurator.</p>
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     *
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     * <p>In the rather exceptional case, where the appender
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     * implementation admits a layout but can also work without it, then
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     * the appender should return <i>true</i>.</p>
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     *
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     * @return boolean
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     */
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    public function requiresLayout() {
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        return $this->requiresLayout;
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    }
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    /**
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     * Retruns the appender name.
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     * @return string
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     */
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    public function getName() {
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        return $this->name;
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    }
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    /**
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     * Sets the appender name.
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     * @param string $name
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     */
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    public function setName($name) {
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        $this->name = $name;
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    }
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    /**
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     * Returns the appender's threshold level.
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     * @return LoggerLevel
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     */
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    public function getThreshold() {
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        return $this->threshold;
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    }
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    /**
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     * Sets the appender threshold.
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     *
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     * @param LoggerLevel|string $threshold Either a {@link LoggerLevel}
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     *   object or a string equivalent.
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     * @see LoggerOptionConverter::toLevel()
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     */
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    public function setThreshold($threshold) {
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        $this->setLevel('threshold', $threshold);
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    }
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    /**
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     * Checks whether the message level is below the appender's threshold.
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     *
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     * If there is no threshold set, then the return value is always <i>true</i>.
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     *
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     * @param LoggerLevel $level
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     * @return boolean Returns true if level is greater or equal than
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     *   threshold, or if the threshold is not set. Otherwise returns false.
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     */
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    public function isAsSevereAsThreshold($level) {
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        if ($this->threshold === null) {
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            return true;
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        }
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        return $level->isGreaterOrEqual($this->getThreshold());
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    }
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    /**
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     * Prepares the appender for logging.
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     *
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     * Derived appenders should override this method if option structure
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     * requires it.
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     */
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    public function activateOptions() {
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        $this->closed = false;
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    }
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    /**
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     * Forwards the logging event to the destination.
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     *
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     * Derived appenders should implement this method to perform actual logging.
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     *
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     * @param LoggerLoggingEvent $event
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     */
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    abstract protected function append(LoggerLoggingEvent $event);
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    /**
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     * Releases any resources allocated by the appender.
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     *
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     * Derived appenders should override this method to perform proper closing
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     * procedures.
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     */
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    public function close() {
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        $this->closed = true;
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    }
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    /** Triggers a warning for this logger with the given message. */
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    protected function warn($message) {
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        $id = get_class($this) . (empty($this->name) ? '' : ":{$this->name}");
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        trigger_error("log4php: [$id]: $message", E_USER_WARNING);
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parents:
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    }
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parents:
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}