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<?php namespace AdammBalogh\KeyValueStore\Adapter\SharedMemoryAdapter; |
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use AdammBalogh\KeyValueStore\Adapter\Util; |
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use AdammBalogh\KeyValueStore\Exception\KeyNotFoundException; |
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/** |
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* @SuppressWarnings(PHPMD.UnusedFormalParameter) |
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*/ |
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trait KeyTrait |
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{ |
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/** |
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* Removes a key. |
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* |
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* @param string $key |
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* |
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* @return bool True if the deletion was successful, false if the deletion was unsuccessful. |
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* |
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* @throws \Exception |
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*/ |
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public function delete($key) |
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{ |
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try { |
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$this->get($key); |
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} catch (KeyNotFoundException $e) { |
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return false; |
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} |
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if (!$this->shmProxy->remove($this->client, $key)) { |
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throw new \Exception('Shm remove error'); |
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} |
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return true; |
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} |
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/** |
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* Sets a key's time to live in seconds. |
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* |
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* @param string $key |
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* @param int $seconds |
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* |
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* @return bool True if the timeout was set, false if the timeout could not be set. |
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* |
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* @throws \Exception |
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*/ |
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public function expire($key, $seconds) |
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{ |
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try { |
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$value = $this->get($key); |
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} catch (KeyNotFoundException $e) { |
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return false; |
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} |
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return $this->set($key, Util::getDataWithExpire($value, $seconds, time())); |
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} |
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/** |
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* Returns the remaining time to live of a key that has a timeout. |
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* |
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* @param string $key |
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* |
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* @return int Ttl in seconds. |
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* |
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* @throws KeyNotFoundException |
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* @throws \Exception |
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*/ |
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public function getTtl($key) |
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{ |
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if (!$this->shmProxy->has($this->client, $key)) { |
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throw new KeyNotFoundException(); |
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} |
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$getResult = $this->shmProxy->get($this->client, $key); |
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$unserialized = @unserialize($getResult); |
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if (!Util::hasInternalExpireTime($unserialized)) { |
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throw new \Exception('Cannot retrieve ttl'); |
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} |
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return $this->handleTtl($key, $unserialized['ts'], $unserialized['s']); |
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} |
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/** |
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* Determines if a key exists. |
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* |
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* @param string $key |
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* |
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* @return bool True if the key does exist, false if the key does not exist. |
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* |
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* @throws \Exception |
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*/ |
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public function has($key) |
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{ |
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try { |
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$this->get($key); |
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} catch (KeyNotFoundException $e) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Removes the existing timeout on key, turning the key from volatile (a key with an expire set) |
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* to persistent (a key that will never expire as no timeout is associated). |
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* |
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* @param string $key |
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* |
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* @return bool True if the persist was success, false if the persis was unsuccessful. |
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* |
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* @throws \Exception |
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*/ |
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public function persist($key) |
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{ |
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if (!$this->shmProxy->has($this->client, $key)) { |
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return false; |
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} |
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$getResult = $this->shmProxy->get($this->client, $key); |
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$unserialized = @unserialize($getResult); |
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if (!Util::hasInternalExpireTime($unserialized)) { |
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return false; |
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} |
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try { |
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$this->handleTtl($key, $unserialized['ts'], $unserialized['s']); |
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} catch (KeyNotFoundException $e) { |
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return false; |
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} |
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return $this->set($key, $unserialized['v']); |
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} |
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} |
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idable
provides a methodequalsId
that in turn relies on the methodgetId()
. If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()
as an abstract method to the trait will make sure it is available.