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<?php |
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namespace Onoi\Cache; |
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use RuntimeException; |
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/** |
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* Combines different cache instances into a combinatory cache |
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* |
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* @license GNU GPL v2+ |
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* @since 1.0 |
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* |
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* @author mwjames |
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*/ |
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class CompositeCache implements Cache { |
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/** |
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* @var array |
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*/ |
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private $caches = array(); |
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/** |
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* @note The access hierarchy is determined by the order of the invoked cache |
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* instances and it is assumed that the faster cache is accessible first. |
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* |
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* @since 1.0 |
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* |
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* @param Cache[] $caches |
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*/ |
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public function __construct( array $caches ) { |
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foreach ( $caches as $key => $cache ) { |
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if ( !is_int( $key ) ) { |
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throw new RuntimeException( 'Associative key is not permitted' ); |
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} |
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if ( !$cache instanceOf Cache ) { |
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throw new RuntimeException( 'The composite contains an invalid cache instance' ); |
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} |
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} |
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$this->caches = $caches; |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function fetch( $id ) { |
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reset( $this->caches ); |
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foreach ( $this->caches as $key => $cache ) { |
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if ( !$cache->contains( $id ) ) { |
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continue; |
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} |
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$data = $cache->fetch( $id ); |
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// The data were not available in a previous instance and it is assumed |
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// that a preceding cache is faster (in-memory lookup etc.) than the |
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// current instance therefore the content is stored one level up for |
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// the next lookup |
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if ( $key > 0 ) { |
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$this->caches[ $key - 1 ]->save( $id, $data ); |
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} |
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return $data; |
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} |
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return false; |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function contains( $id ) { |
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foreach ( $this->caches as $cache ) { |
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if ( $cache->contains( $id ) ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function save( $id, $data, $ttl = 0 ) { |
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foreach ( $this->caches as $cache ) { |
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$cache->save( $id, $data, $ttl ); |
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} |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function delete( $id ) { |
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foreach ( $this->caches as $cache ) { |
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$cache->delete( $id ); |
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} |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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1 |
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public function getStats() { |
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$stats = array(); |
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foreach ( $this->caches as $cache ) { |
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$stats[$cache->getName()] = $cache->getStats(); |
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} |
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return $stats; |
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} |
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/** |
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* @since 1.2 |
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133
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* |
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134
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* {@inheritDoc} |
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135
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*/ |
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1 |
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public function getName() { |
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$name = ''; |
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1 |
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foreach ( $this->caches as $cache ) { |
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$name = $name . '::' . $cache->getName(); |
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} |
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1 |
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return __CLASS__ . $name; |
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} |
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147
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} |
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onoi /
cache
