schedule.php

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<?php

      /*
      *     This source code is a part of the Ultimix Project.
      *     It is distributed under BSD license. All other third side source code (like tinyMCE) is distributed under 
      *     it's own license wich could be found from the corresponding files or sources. 
      *     This source code is provided "as is" without any warranties or garanties.
      *
      *     Have a nice day!
      *
      *     @url http://ultimix.sorceforge.net
      *
      *     @author Alexey "gdever" Dodonov
      */

      /*
      *     type - 2
      *     time_step - Time step in seconds.
      *     archived - 0
      *     processing - 0
      *     count - 1
      *     next_iteration - 0
      *     iteration_step - 1
      *
      *     This parameters means that this task will be run once in time_step seconds
      */

      class schedule_1_0_0{
            
            var                           $Database = false;
            var                           $String = false;
            var                           $Settings = false;
            var                           $ScheduleAccess = false;
            var                           $ScheduleAlgorithms = false;
            
            function                __construct()
            {
                  try
                  {
                        $this->Database = get_package( 'database' , 'last' , __FILE__ );
                        $this->String = get_package( 'string' , 'last' , __FILE__ );
                        $this->Settings = get_package_object( 'settings::settings' , 'last' , __FILE__ );
                        $this->ScheduleAccess = get_package( 'schedule::schedule_access' , 'last' , __FILE__ );
                        $this->ScheduleAlgorithms = get_package( 'schedule::schedule_algorithms' , 'last' , __FILE__ );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                run_task( $Parameters , $CurrentIteration )
            {
                  try
                  {
                        $this->Settings->load_settings( $Parameters );
                        if( $this->Settings->get_setting( 'cron_ping' , '0' ) == 1 )
                        {
                              print( 'Cron ping' );
                              
                              return( $CurrentIteration + 1 );
                        }
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            private function  call_run_task_function( $Task )
            {
                  try
                  {
                        $Package = get_package( $Task->package_name , $Task->package_version , __FILE__ );

                        if( $Package === false )
                        {
                              throw( new Exception( 'The package "'.$Task->package_name.'" has no script' ) );
                        }

                        $Delegate = array( $Package , 'schedule_task' );

                        return( intval( call_user_func( $Delegate , $Task->parameters , $Task->next_iteration ) ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            private function  finish_task_processing( $Task , $NextIteration )
            {
                  try
                  {
                        $IntervalField = $NextIteration == 0 ? 'time_step' : 'iteration_step';

                        $Fields = array( 'processing' , 'next_processing_time' , '`count`' , 'archived' , 'next_iteration' );
                        $Values = array( 
                              0 , "DATE_ADD( NOW() , INTERVAL $IntervalField SECOND )" , 'IF( `count` > 1 , `count` - 1 , 1 )' , 
                              'IF( type = 1 AND `count` = 1 , 1 , 0 )' , $NextIteration 
                        );

                        $this->Database->update( 'umx_schedule' , $Fields , $Values , 'id = '.$Task->id );

                        $this->Database->commit();
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                run_single_task( $Task )
            {
                  try
                  {
                        $NextIteration = $this->call_run_task_function( $Task );

                        $this->finish_task_processing( $Task , $NextIteration );
                  }
                  catch( Exception $e )
                  {
                        $this->Database->unlock();/* clear all locks if the exception was caught */
                        $this->ScheduleAccess->update( $Task->id , array( 'processing' => 0 ) );
                        $this->Database->commit();
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                run_all_tasks( $Tasks )
            {
                  try
                  {
                        $Ids = implode_ex( ',' , $Tasks , 'id' );
                        $this->ScheduleAccess->update( $Ids , array( 'processing' => 1 ) );
                        $this->Database->unlock();

                        foreach( $Tasks as $k => $Task )
                        {
                              $this->run_single_task( $Task );
                        }
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                run_tasks()
            {
                  try
                  {
                        $this->Database->lock( array( 'umx_schedule' ) , array( 'WRITE' ) );

                        $this->Settings->load_file( dirname( __FILE__ ).'/conf/cf_schedule_settings' );
                        $Tasks = $this->ScheduleAlgorithms->get_tasks( 
                              $this->Settings->get_setting( 'processing_tasks_count' , 10 )
                        );

                        if( isset( $Tasks[ 0 ] ) )
                        {
                              $this->run_all_tasks( $Tasks );
                        }
                        else
                        {
                              $this->Database->unlock();
                        }
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
      }

?>