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Memoize.php
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Memoize.php
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<?php
declare(strict_types=1);
namespace Phan;
use Closure;
/**
* A utility trait to memoize (cache) the result of instance methods and static methods.
*/
trait Memoize
{
use Profile;
/**
* @var array<string,mixed>
* A map from key to memoized values
* @internal
*/
protected $memoized_data = [];
/**
* Memoize the result of $fn(), saving the result
* with key $key.
*
* @template T
*
* @param string $key
* The key to use for storing the result of the
* computation.
*
* @param Closure():T $fn
* A function to compute only once for the given
* $key.
*
* @return T
* The result of the given computation is returned
*/
protected function memoize(string $key, Closure $fn)
{
if (!\array_key_exists($key, $this->memoized_data)) {
$this->memoized_data[$key] = $fn();
}
return $this->memoized_data[$key];
}
/**
* @param string $key
* A unique key to test to see if it's been seen before
*
* @return bool
* True if this is the first time this function has been
* called on this class with this key.
*/
protected function isFirstExecution(string $key): bool
{
if (!\array_key_exists($key, $this->memoized_data)) {
$this->memoized_data[$key] = true;
return true;
}
return false;
}
/**
* Memoize the result of $fn(), saving the result
* with key $key.
* (cached statically)
*
* @template T
*
* @param string $key
* The key to use for storing the result of the
* computation.
*
* @param Closure():T $fn
* A function to compute only once for the given
* $key.
*
* @return T
* The result of the given computation is returned
*/
protected static function memoizeStatic(string $key, Closure $fn)
{
static $memoized_data = [];
if (!\array_key_exists($key, $memoized_data)) {
$memoized_data[$key] = $fn();
}
return $memoized_data[$key];
}
/**
* Delete all memoized data
*/
protected function memoizeFlushAll(): void
{
$this->memoized_data = [];
}
}

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Wed, Aug 19, 16:12 (4 w, 1 d ago)
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Memoize.php (2 KB)

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