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class-urlrewritecache.php
47 lines
| 1 | <?php |
| 2 | |
| 3 | namespace WordPress\DataLiberation\URL; |
| 4 | |
| 5 | /** |
| 6 | * Small bounded cache for URL rewrite hot paths. |
| 7 | * |
| 8 | * The cache intentionally uses fixed-size ring eviction instead of tracking |
| 9 | * frequency or recency. These rewrite paths mostly benefit from avoiding |
| 10 | * repeated work for the same few URLs inside a large import batch, and the |
| 11 | * constant-memory ring keeps that optimization predictable. |
| 12 | */ |
| 13 | class URLRewriteCache { |
| 14 | const DEFAULT_MAX_ENTRIES = 4096; |
| 15 | |
| 16 | private $max_entries; |
| 17 | private $values = array(); |
| 18 | private $ring = array(); |
| 19 | private $next = 0; |
| 20 | |
| 21 | public function __construct( $max_entries = self::DEFAULT_MAX_ENTRIES ) { |
| 22 | $this->max_entries = max( 1, (int) $max_entries ); |
| 23 | } |
| 24 | |
| 25 | public function get( $key ) { |
| 26 | return array_key_exists( $key, $this->values ) |
| 27 | ? $this->values[ $key ] |
| 28 | : null; |
| 29 | } |
| 30 | |
| 31 | public function set( $key, $value ) { |
| 32 | if ( ! array_key_exists( $key, $this->values ) ) { |
| 33 | if ( count( $this->ring ) < $this->max_entries ) { |
| 34 | $this->ring[] = $key; |
| 35 | } else { |
| 36 | $evicted_key = $this->ring[ $this->next ]; |
| 37 | unset( $this->values[ $evicted_key ] ); |
| 38 | $this->ring[ $this->next ] = $key; |
| 39 | } |
| 40 | |
| 41 | $this->next = ( $this->next + 1 ) % $this->max_entries; |
| 42 | } |
| 43 | |
| 44 | $this->values[ $key ] = $value; |
| 45 | } |
| 46 | } |
| 47 |