/*

 * 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.

 */

#if !defined(_LOG4CXX_ROLLING_TIME_BASED_ROLLING_POLICY_H)

#define _LOG4CXX_ROLLING_TIME_BASED_ROLLING_POLICY_H

#include <log4cxx/rolling/rollingpolicybase.h>

#include <log4cxx/rolling/triggeringpolicy.h>

#include <log4cxx/writerappender.h>

#include <log4cxx/helpers/outputstream.h>

#include <functional>

namespace LOG4CXX_NS

{

namespace rolling

{

/**

 * <code>TimeBasedRollingPolicy</code> is both easy to configure and quite

 * powerful.

 *

 * <p>In order to use  <code>TimeBasedRollingPolicy</code>, the

 * <b>FileNamePattern</b> option must be set. It basically specifies the name of the

 * rolled log files. The value <code>FileNamePattern</code> should consist of

 * the name of the file, plus a suitably placed <code>\%d</code> conversion

 * specifier. The <code>\%d</code> conversion specifier may contain a date and

 * time pattern as specified by the {@link log4cxx::helpers::SimpleDateFormat} class. If

 * the date and time pattern is ommitted, then the default pattern of

 * "yyyy-MM-dd" is assumed. The following examples should clarify the point.

 *

 * <p>

 * <table cellspacing="5px" border="1">

 *   <tr>

 *     <th><code>FileNamePattern</code> value</th>

 *     <th>Rollover schedule</th>

 *     <th>Example</th>

 *   </tr>

 *   <tr>

 *     <td nowrap="true"><code>/wombat/folder/foo.\%d</code></td>

 *     <td>Daily rollover (at midnight).  Due to the omission of the optional

 *         time and date pattern for the \%d token specifier, the default pattern

 *         of "yyyy-MM-dd" is assumed, which corresponds to daily rollover.

 *     </td>

 *     <td>During November 23rd, 2004, logging output will go to

 *       the file <code>/wombat/foo.2004-11-23</code>. At midnight and for

 *       the rest of the 24th, logging output will be directed to

 *       <code>/wombat/foo.2004-11-24</code>.

 *     </td>

 *   </tr>

 *   <tr>

 *     <td nowrap="true"><code>/wombat/foo.\%d{yyyy-MM}.log</code></td>

 *     <td>Rollover at the beginning of each month.</td>

 *     <td>During the month of October 2004, logging output will go to

 *     <code>/wombat/foo.2004-10.log</code>. After midnight of October 31st

 *     and for the rest of November, logging output will be directed to

 *       <code>/wombat/foo.2004-11.log</code>.

 *     </td>

 *   </tr>

 * </table>

 * <h2>Automatic file compression</h2>

 * <code>TimeBasedRollingPolicy</code> supports automatic file compression.

 * This feature is enabled if the value of the <b>FileNamePattern</b> option

 * ends with <code>.gz</code> or <code>.zip</code>.

 * <p>

 * <table cellspacing="5px" border="1">

 *   <tr>

 *     <th><code>FileNamePattern</code> value</th>

 *     <th>Rollover schedule</th>

 *     <th>Example</th>

 *   </tr>

 *   <tr>

 *     <td nowrap="true"><code>/wombat/foo.\%d.gz</code></td>

 *     <td>Daily rollover (at midnight) with automatic GZIP compression of the

 *      arcived files.</td>

 *     <td>During November 23rd, 2004, logging output will go to

 *       the file <code>/wombat/foo.2004-11-23</code>. However, at midnight that

 *       file will be compressed to become <code>/wombat/foo.2004-11-23.gz</code>.

 *       For the 24th of November, logging output will be directed to

 *       <code>/wombat/folder/foo.2004-11-24</code> until its rolled over at the

 *       beginning of the next day.

 *     </td>

 *   </tr>

 * </table>

 *

 * <h2>Decoupling the location of the active log file and the archived log files</h2>

 * <p>The <em>active file</em> is defined as the log file for the current period

 * whereas <em>archived files</em> are thos files which have been rolled over

 * in previous periods.

 *

 * <p>By setting the <b>ActiveFileName</b> option you can decouple the location

 * of the active log file and the location of the archived log files.

 * <p>

 *  <table cellspacing="5px" border="1">

 *   <tr>

 *     <th><code>FileNamePattern</code> value</th>

 *     <th>ActiveFileName</th>

 *     <th>Rollover schedule</th>

 *     <th>Example</th>

 *   </tr>

 *   <tr>

 *     <td nowrap="true"><code>/wombat/foo.log.\%d</code></td>

 *     <td nowrap="true"><code>/wombat/foo.log</code></td>

 *     <td>Daily rollover.</td>

 *

 *     <td>During November 23rd, 2004, logging output will go to

 *       the file <code>/wombat/foo.log</code>. However, at midnight that file

 *       will archived as <code>/wombat/foo.log.2004-11-23</code>. For the 24th

 *       of November, logging output will be directed to

 *       <code>/wombat/folder/foo.log</code> until its archived as

 *       <code>/wombat/foo.log.2004-11-24</code> at the beginning of the next

 *       day.

 *     </td>

 *   </tr>

 * </table>

 * <p>

 * If configuring programatically, do not forget to call {@link #activateOptions}

 * method before using this policy. Moreover, {@link #activateOptions} of

 * <code> TimeBasedRollingPolicy</code> must be called <em>before</em> calling

 * the {@link #activateOptions} method of the owning

 * <code>RollingFileAppender</code>.

 */

class LOG4CXX_EXPORT TimeBasedRollingPolicy : public virtual RollingPolicyBase,

  public virtual TriggeringPolicy

{

    DECLARE_LOG4CXX_OBJECT(TimeBasedRollingPolicy)

    BEGIN_LOG4CXX_CAST_MAP()

    LOG4CXX_CAST_ENTRY(TimeBasedRollingPolicy)

    LOG4CXX_CAST_ENTRY_CHAIN(RollingPolicyBase)

    LOG4CXX_CAST_ENTRY_CHAIN(TriggeringPolicy)

    END_LOG4CXX_CAST_MAP()

  private:

    LOG4CXX_DECLARE_PRIVATE_MEMBER_PTR(TimeBasedRollingPolicyPrivate, m_priv)

  public:

    TimeBasedRollingPolicy();

    virtual ~TimeBasedRollingPolicy();

    /**

    \copybrief RollingPolicyBase::activateOptions()

    Logs a warning if an option is not valid.

    \sa RollingPolicyBase::activateOptions()

    */

    void activateOptions(helpers::Pool& ) override;

    void setMultiprocess(bool multiprocess);

    /**

     * {@inheritDoc}

     */

    RolloverDescriptionPtr initialize(

      const   LogString&              currentActiveFile,

      const   bool                    append,

      helpers::Pool& pool) override;

    /**

     * {@inheritDoc}

     */

    RolloverDescriptionPtr rollover(

      const   LogString&              currentActiveFile,

      const   bool                    append,

      helpers::Pool& pool) override;

    /**

     * Determines if a rollover may be appropriate at this time.  If

     * true is returned, RolloverPolicy.rollover will be called but it

     * can determine that a rollover is not warranted.

     *

     * @param appender A reference to the appender.

     * @param event A reference to the currently event.

     * @param filename The filename for the currently active log file.

     * @param fileLength Length of the file in bytes.

     * @return true if a rollover should occur.

     */

    bool isTriggeringEvent(

      Appender* appender,

      const spi::LoggingEventPtr& event,

      const LogString& filename,

      size_t fileLength) override;

    /**

    \copybrief RollingPolicyBase::setOption()

    Supported options | Supported values | Default value

    :-------------- | :----------------: | :---------------:

    ThrowIOExceptionOnForkFailure | True,False | True

    \sa RollingPolicyBase::setOption()

     */

    void setOption(const LogString& option, const LogString& value) override;

    /**

     * Was the name in shared memory set by this process?

     */

    bool isLastFileNameUnchanged();

    /**

     * Load the name (set by some other process) from shared memory

     */

    void loadLastFileName();

  protected:

    /**

     * A map from "d" and "date" to a date conversion formatter.

     *

     * \sa FileDatePatternConverter

     */

    LOG4CXX_NS::pattern::PatternMap getFormatSpecifiers() const override;

  private:

    /**

     * Generate mmap file

     */

    int createMMapFile(const std::string& lastfilename, LOG4CXX_NS::helpers::Pool& pool);

    /**

     *  Detect if the mmap file is empty

     */

    bool isMapFileEmpty(LOG4CXX_NS::helpers::Pool& pool);

    /**

     *   init MMapFile

     */

    void initMMapFile(const LogString& lastFileName, LOG4CXX_NS::helpers::Pool& pool);

    /**

     *   lock MMapFile

     */

    int lockMMapFile(int type);

    /**

     *   unlock MMapFile

     */

    int unLockMMapFile();

    /**

     *   create MMapFile/lockFile

     */

    const std::string createFile(const std::string& filename, const std::string& suffix, LOG4CXX_NS::helpers::Pool& pool);

};

LOG4CXX_PTR_DEF(TimeBasedRollingPolicy);

}

}

#endif