How does PHP obtain the job Queue, create execution processes, and wait for the end?

How does PHP obtain the job Queue, create execution processes, and wait for the end?

A post-desktop Job Management instance. The process is to obtain the job Queue from the database, create a new process for execution, and wait until the job ends.

Code snippet:

Class Controller_Jobs extends Controller_Base {

Public function before (){

Parent: before ();

If (Request: $ protocol! = "Cli "){

Die ("Only cli allowed! \ N ");

}

}

Public function after (){

Parent: after ();

// Do some cleaning tasks

}

Private function _ execJobCommand ($ joburi, $ paras ){

$ Php_exec = Kohana: config ("picsou. php_exec ");

$ Php_index = APPINDEX;

$ Command_args = array ();

$ Command_args [] = $ php_index;

$ Command_args [] = "-- uri =". $ joburi;

Foreach ($ paras as $ para => $ value ){

$ Command_args [] = "--". $ para. "=". $ value;

}

// Var_dump ($ command_args); exit;

Echo "exec commmand:". $ php_exec. "\ n ";

Pcntl_exec ($ php_exec, $ command_args );

}

/*

* Running jobs in queues

*/

Public function action_run (){

$ RequestCount = 0;

While (true ){

$ SQL = "select * from job_queue where status = '1' and approved = '1' order by id ";

$ Jobs = DB: query (Database: SELECT, $ SQL)-> execute ()-> as_array ();

If ($ jobs ){

Foreach ($ jobs as $ job ){

$ RequestCount ++;

// Update the jobs status as running

DB: update ('job _ queue ')-> set (array ('status' => '2 '))

-> Where ('id', '=', $ job ['id'])-> execute ();

$ Job_pid = pcntl_fork ();

If ($ job_pid =-1 ){

Die ("cocould not fork Child ");

} Else if ($ job_pid = 0 ){

$ This-> _ execJobCommand ($ job ['job _ uri '], json_decode ($ job ['paras'], true ));

Echo "finish Child \ n ";

Exit (0 );

// Run jobs here

} Else {

Echo "Waiting for job \ n ";

Ob_flush ();

$ Child_pid = pcntl_waitpid ($ job_pid, $ status, WUNTRACED );

Echo "waitpid end:". $ status. "\ n ";

If ($ status = 0 ){

// Job completed

DB: update ('job _ queue ')-> set (array ('status' => '2013 '))

-> Where ('id', '=', $ job ['id'])-> execute ();

Echo "Child Finished \ n ";

Ob_flush ();

} Else {

DB: update ('job _ queue ')-> set (array ('status' =>'-1 '))

-> Where ('id', '=', $ job ['id'])-> execute ();

Echo "Child Failed \ n ";

Ob_flush ();

}

}

}

}

Else {

If ($ requestCount> = 10 ){

Echo "Have a rest, I have processed 10 jobs \ n ";

Exit;

}

// No job to run

// Echo "No job \ n ";

Ob_flush ();

Sleep (5 );

}

}

}

}