library/log4php/appenders/LoggerAppenderDailyFile.php
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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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/**
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 * An Appender that automatically creates a new logfile each day.
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 *
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 * The file is rolled over once a day. That means, for each day a new file
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 * is created. A formatted version of the date pattern is used as to create
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 * the file name using the {@link PHP_MANUAL#sprintf} function.
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 *
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 * This appender uses a layout.
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 *
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 * ##Configurable parameters:##
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 *
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 * - **datePattern** - Format for the date in the file path, follows formatting
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 *     rules used by the PHP date() function. Default value: "Ymd".
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 * - **file** - Path to the target file. Should contain a %s which gets
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 *     substituted by the date.
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 * - **append** - If set to true, the appender will append to the file,
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 *     otherwise the file contents will be overwritten. Defaults to true.
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 *
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 * @version $Revision: 1382274 $
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 * @package log4php
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 * @subpackage appenders
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 * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
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 * @link http://logging.apache.org/log4php/docs/appenders/daily-file.html Appender documentation
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 */
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class LoggerAppenderDailyFile extends LoggerAppenderFile {
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    /**
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     * The 'datePattern' parameter.
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     * Determines how date will be formatted in file name.
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     * @var string
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     */
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    protected $datePattern = "Ymd";
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    /**
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     * Current date which was used when opening a file.
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     * Used to determine if a rollover is needed when the date changes.
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     * @var string
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     */
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    protected $currentDate;
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    /** Additional validation for the date pattern. */
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    public function activateOptions() {
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        parent::activateOptions();
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        if (empty($this->datePattern)) {
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            $this->warn("Required parameter 'datePattern' not set. Closing appender.");
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            $this->closed = true;
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            return;
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        }
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    }
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    /**
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     * Appends a logging event.
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     *
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     * If the target file changes because of passage of time (e.g. at midnight)
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     * the current file is closed. A new file, with the new date, will be
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     * opened by the write() method.
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     */
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    public function append(LoggerLoggingEvent $event) {
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        $eventDate = $this->getDate($event->getTimestamp());
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        // Initial setting of current date
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        if (!isset($this->currentDate)) {
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            $this->currentDate = $eventDate;
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        } // Check if rollover is needed
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        else if ($this->currentDate !== $eventDate) {
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            $this->currentDate = $eventDate;
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            // Close the file if it's open.
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            // Note: $this->close() is not called here because it would set
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            //       $this->closed to true and the appender would not recieve
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            //       any more logging requests
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            if (is_resource($this->fp)) {
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                $this->write($this->layout->getFooter());
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                fclose($this->fp);
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            }
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            $this->fp = null;
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        }
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        parent::append($event);
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    }
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    /** Renders the date using the configured <var>datePattern<var>. */
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    protected function getDate($timestamp = null) {
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        return date($this->datePattern, $timestamp);
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    }
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    /**
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     * Determines target file. Replaces %s in file path with a date.
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     */
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    protected function getTargetFile() {
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        return str_replace('%s', $this->currentDate, $this->file);
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    }
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    /**
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     * Sets the 'datePattern' parameter.
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     * @param string $datePattern
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     */
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    public function setDatePattern($datePattern) {
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        $this->setString('datePattern', $datePattern);
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    }
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    /**
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     * Returns the 'datePattern' parameter.
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     * @return string
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     */
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    public function getDatePattern() {
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        return $this->datePattern;
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    }
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}