Created
January 10, 2020 03:01
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Generators Sample Code
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<?php | |
class Task { | |
protected $taskId; | |
protected $coroutine; | |
protected $sendValue = null; | |
protected $beforeFirstYield = true; | |
public function __construct($taskId, Generator $coroutine) { | |
$this->taskId = $taskId; | |
$this->coroutine = $coroutine; | |
} | |
public function getTaskId() { | |
return $this->taskId; | |
} | |
public function setSendValue($sendValue) { | |
$this->sendValue = $sendValue; | |
} | |
public function run() { | |
if ($this->beforeFirstYield) { | |
$this->beforeFirstYield = false; | |
return $this->coroutine->current(); | |
} else { | |
$retval = $this->coroutine->send($this->sendValue); | |
$this->sendValue = null; | |
return $retval; | |
} | |
} | |
public function isFinished() { | |
return !$this->coroutine->valid(); | |
} | |
} | |
class Scheduler { | |
protected $maxTaskId = 0; | |
protected $taskMap = []; // taskId => task | |
protected $taskQueue; | |
public function __construct() { | |
$this->taskQueue = new SplQueue(); | |
} | |
public function newTask(Generator $coroutine) { | |
$tid = ++$this->maxTaskId; | |
$task = new Task($tid, $coroutine); | |
$this->taskMap[$tid] = $task; | |
$this->schedule($task); | |
return $tid; | |
} | |
public function schedule(Task $task) { | |
$this->taskQueue->enqueue($task); | |
} | |
public function run() { | |
while (!$this->taskQueue->isEmpty()) { | |
$task = $this->taskQueue->dequeue(); | |
echo $task->run(); | |
if ($task->isFinished()) { | |
unset($this->taskMap[$task->getTaskId()]); | |
} else { | |
$this->schedule($task); | |
} | |
} | |
} | |
} | |
function task1() { | |
for ($i = 1; $i <= 10; ++$i) { | |
echo "This is task 1 iteration $i.\n"; | |
yield; | |
} | |
} | |
function task2() { | |
for ($i = 1; $i <= 5; ++$i) { | |
echo "This is task 2 iteration $i.\n"; | |
yield; | |
} | |
} | |
$scheduler = new Scheduler; | |
$scheduler->newTask(task1()); | |
$scheduler->newTask(task2()); | |
$scheduler->run(); |
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<?php | |
function getRangeArray($max = 10) { | |
$array = []; | |
for ($i = 1; $i < $max; $i++) { | |
$array[] = $i; | |
} | |
return $array; | |
} | |
function getRangeGenerator($max = 10) { | |
for ($i = 1; $i < $max; $i++) { | |
yield $i; | |
} | |
} | |
class SimpleIterator implements Iterator { | |
private $position = 1; | |
private $max = 1; | |
public function __construct($max = 15) { | |
$this->position = 1; | |
$this->max = $max; | |
} | |
function rewind() { | |
$this->position = 1; | |
} | |
function current() { | |
return $this->position; | |
} | |
function key() { | |
return $this->position; | |
} | |
function next() { | |
++$this->position; | |
} | |
function valid() { | |
return ($this->position < $this->max); | |
} | |
} | |
// ---- Toggle each of these in turn. ---- | |
// foreach (getRangeArray(15) as $range) { | |
// echo "Value: {$range} \n"; | |
// } | |
// foreach (getRangeArray(PHP_INT_MAX) as $range) { | |
// echo "Dataset {$range} \n"; | |
// } | |
// foreach (getRangeGenerator(15) as $range) { | |
// echo "Dataset {$range} \n"; | |
// } | |
// foreach ((new SimpleIterator(15)) as $range) { | |
// echo "Value: {$range} \n"; | |
// } | |
// foreach ((getRangeGenerator(PHP_INT_MAX)) as $range) { | |
// echo "Dataset {$range} \n"; | |
// } | |
foreach ((new SimpleIterator(PHP_INT_MAX)) as $range) { | |
echo "Value: {$range} \n"; | |
} |
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