How PHP gets the job queue, creates the execution process, waits for the end

A background job management instance that obtains a job queue from the database, creates a new process for execution, and waits for the job to end.

Code fragment:

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 ("Could not fork child");

else if ($job _pid = = 0) {

$this->_execjobcommand ($job [' Job_uri '],json_decode ($job [' paras '],true)];

echo "Finish Childn";

Exit (0);

Run jobs here

} else{

echo "Waiting for jobn";

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 ' => ' 999 '))

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

echo "Child Finishedn";

Ob_flush ();

}else{

Db::update (' Job_queue ')->set (array (' status ' => '-1 '))

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

echo "Child Failedn";

Ob_flush ();

}

}

}

}

else{

if ($requestCount >=10) {

echo "Have a rest, I Have processed JOBSN";

Exit

}

No job to run

echo "No jobn";

Ob_flush ();

Sleep (5);

}

}

}

}