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<?php |
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namespace Spiral\PhpFastCache; |
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use phpFastCache\Cache\ExtendedCacheItemInterface; |
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use Psr\Cache\CacheItemPoolInterface; |
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use Psr\SimpleCache\CacheInterface; |
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use Spiral\PhpFastCache\Exceptions\SpiralFastCacheException; |
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class SimpleCacheAdapter implements CacheInterface |
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{ |
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/** |
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* @var CacheItemPoolInterface |
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*/ |
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protected $pool; |
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/** |
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* PSR16Adapter constructor. |
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* |
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* @param CacheItemPoolInterface $pool |
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*/ |
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public function __construct(CacheItemPoolInterface $pool) |
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{ |
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$this->pool = $pool; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get($key, $default = null) |
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{ |
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try { |
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$value = $this->pool->getItem($key)->get(); |
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if ($value !== null) { |
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return $value; |
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} else { |
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return $default; |
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} |
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} catch (\Throwable $e) { |
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throw new SpiralFastCacheException($e->getMessage(), $e->getMessage(), $e); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function set($key, $value, $ttl = null) |
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{ |
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try { |
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$item = $this->pool |
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->getItem($key) |
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->set($value); |
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if (is_int($ttl) || $ttl instanceof \DateInterval) { |
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$item->expiresAfter($ttl); |
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} |
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return $this->pool->save($item); |
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} catch (\Throwable $e) { |
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throw new SpiralFastCacheException($e->getMessage(), $e->getMessage(), $e); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function delete($key) |
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{ |
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try { |
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return $this->pool->deleteItem($key); |
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} catch (\Throwable $e) { |
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throw new SpiralFastCacheException($e->getMessage(), $e->getMessage(), $e); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function clear() |
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{ |
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try { |
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return $this->pool->clear(); |
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} catch (\Throwable $e) { |
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throw new SpiralFastCacheException($e->getMessage(), $e->getMessage(), $e); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMultiple($keys, $default = null) |
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{ |
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try { |
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return array_map(function (ExtendedCacheItemInterface $item) { |
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return $item->get(); |
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}, $this->pool->getItems($keys)); |
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} catch (\Throwable $e) { |
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throw new SpiralFastCacheException($e->getMessage(), $e->getMessage(), $e); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setMultiple($values, $ttl = null) |
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{ |
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try { |
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foreach ($values as $key => $value) { |
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$item = $this->pool->getItem($key)->set($value); |
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$this->pool->saveDeferred($item); |
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unset($item); |
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} |
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return $this->pool->commit(); |
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} catch (\Throwable $e) { |
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throw new SpiralFastCacheException($e->getMessage(), $e->getMessage(), $e); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function deleteMultiple($keys) |
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{ |
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try { |
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return $this->pool->deleteItems($keys); |
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} catch (\Throwable $e) { |
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throw new SpiralFastCacheException($e->getMessage(), $e->getMessage(), $e); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function has($key) |
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{ |
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try { |
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return $this->pool->getItem($key)->isHit(); |
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} catch (\Throwable $e) { |
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throw new SpiralFastCacheException($e->getMessage(), $e->getMessage(), $e); |
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} |
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} |
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} |
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.