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PhutilInRequestKeyValueCache.php
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Mon, May 20, 10:20

PhutilInRequestKeyValueCache.php
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<?php
/**
* Key-value cache implemented in the current request. All storage is local
* to this request (i.e., the current page) and destroyed after the request
* exits. This means the first request to this cache for a given key on a page
* will ALWAYS miss.
*
* This cache exists mostly to support unit tests. In a well-designed
* applications, you generally should not be fetching the same data over and
* over again in one request, so this cache should be of limited utility.
* If using this cache improves application performance, especially if it
* improves it significantly, it may indicate an architectural problem in your
* application.
*/
final class PhutilInRequestKeyValueCache extends PhutilKeyValueCache {
private $cache = array();
private $ttl = array();
private $limit = 0;
/**
* Set a limit on the number of keys this cache may contain.
*
* When too many keys are inserted, the oldest keys are removed from the
* cache. Setting a limit of `0` disables the cache.
*
* @param int Maximum number of items to store in the cache.
* @return this
*/
public function setLimit($limit) {
$this->limit = $limit;
return $this;
}
/* -( Key-Value Cache Implementation )------------------------------------- */
public function isAvailable() {
return true;
}
public function getKeys(array $keys) {
$results = array();
$now = time();
foreach ($keys as $key) {
if (!isset($this->cache[$key]) && !array_key_exists($key, $this->cache)) {
continue;
}
if (isset($this->ttl[$key]) && ($this->ttl[$key] < $now)) {
continue;
}
$results[$key] = $this->cache[$key];
}
return $results;
}
public function setKeys(array $keys, $ttl = null) {
foreach ($keys as $key => $value) {
$this->cache[$key] = $value;
}
if ($ttl) {
$end = time() + $ttl;
foreach ($keys as $key => $value) {
$this->ttl[$key] = $end;
}
} else {
foreach ($keys as $key => $value) {
unset($this->ttl[$key]);
}
}
if ($this->limit) {
$count = count($this->cache);
if ($count > $this->limit) {
$remove = array();
foreach ($this->cache as $key => $value) {
$remove[] = $key;
$count--;
if ($count <= $this->limit) {
break;
}
}
$this->deleteKeys($remove);
}
}
return $this;
}
public function deleteKeys(array $keys) {
foreach ($keys as $key) {
unset($this->cache[$key]);
unset($this->ttl[$key]);
}
return $this;
}
public function getAllKeys() {
return $this->cache;
}
public function destroyCache() {
$this->cache = array();
$this->ttl = array();
return $this;
}
}

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