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<?php
namespace Doctrine\Common\Cache;
use Traversable;
use function array_values;
use function count;
use function iterator_to_array;
/**
* Cache provider that allows to easily chain multiple cache providers
*/
class ChainCache extends CacheProvider
{
/** @var CacheProvider[] */
private $cacheProviders = [];
/** @var int */
private $defaultLifeTimeForDownstreamCacheProviders = 0;
/**
* @param CacheProvider[] $cacheProviders
*/
public function __construct($cacheProviders = [])
{
$this->cacheProviders = $cacheProviders instanceof Traversable
? iterator_to_array($cacheProviders, false)
: array_values($cacheProviders);
}
public function setDefaultLifeTimeForDownstreamCacheProviders(int $defaultLifeTimeForDownstreamCacheProviders) : void
{
$this->defaultLifeTimeForDownstreamCacheProviders = $defaultLifeTimeForDownstreamCacheProviders;
}
/**
* {@inheritDoc}
*/
public function setNamespace($namespace)
{
parent::setNamespace($namespace);
foreach ($this->cacheProviders as $cacheProvider) {
$cacheProvider->setNamespace($namespace);
}
}
/**
* {@inheritDoc}
*/
protected function doFetch($id)
{
foreach ($this->cacheProviders as $key => $cacheProvider) {
if ($cacheProvider->doContains($id)) {
$value = $cacheProvider->doFetch($id);
// We populate all the previous cache layers (that are assumed to be faster)
for ($subKey = $key - 1; $subKey >= 0; $subKey--) {
$this->cacheProviders[$subKey]->doSave($id, $value, $this->defaultLifeTimeForDownstreamCacheProviders);
}
return $value;
}
}
return false;
}
/**
* {@inheritdoc}
*/
protected function doFetchMultiple(array $keys)
{
/** @var CacheProvider[] $traversedProviders */
$traversedProviders = [];
$keysCount = count($keys);
$fetchedValues = [];
foreach ($this->cacheProviders as $key => $cacheProvider) {
$fetchedValues = $cacheProvider->doFetchMultiple($keys);
// We populate all the previous cache layers (that are assumed to be faster)
if (count($fetchedValues) === $keysCount) {
foreach ($traversedProviders as $previousCacheProvider) {
$previousCacheProvider->doSaveMultiple($fetchedValues, $this->defaultLifeTimeForDownstreamCacheProviders);
}
return $fetchedValues;
}
$traversedProviders[] = $cacheProvider;
}
return $fetchedValues;
}
/**
* {@inheritDoc}
*/
protected function doContains($id)
{
foreach ($this->cacheProviders as $cacheProvider) {
if ($cacheProvider->doContains($id)) {
return true;
}
}
return false;
}
/**
* {@inheritDoc}
*/
protected function doSave($id, $data, $lifeTime = 0)
{
$stored = true;
foreach ($this->cacheProviders as $cacheProvider) {
$stored = $cacheProvider->doSave($id, $data, $lifeTime) && $stored;
}
return $stored;
}
/**
* {@inheritdoc}
*/
protected function doSaveMultiple(array $keysAndValues, $lifetime = 0)
{
$stored = true;
foreach ($this->cacheProviders as $cacheProvider) {
$stored = $cacheProvider->doSaveMultiple($keysAndValues, $lifetime) && $stored;
}
return $stored;
}
/**
* {@inheritDoc}
*/
protected function doDelete($id)
{
$deleted = true;
foreach ($this->cacheProviders as $cacheProvider) {
$deleted = $cacheProvider->doDelete($id) && $deleted;
}
return $deleted;
}
/**
* {@inheritdoc}
*/
protected function doDeleteMultiple(array $keys)
{
$deleted = true;
foreach ($this->cacheProviders as $cacheProvider) {
$deleted = $cacheProvider->doDeleteMultiple($keys) && $deleted;
}
return $deleted;
}
/**
* {@inheritDoc}
*/
protected function doFlush()
{
$flushed = true;
foreach ($this->cacheProviders as $cacheProvider) {
$flushed = $cacheProvider->doFlush() && $flushed;
}
return $flushed;
}
/**
* {@inheritDoc}
*/
protected function doGetStats()
{
// We return all the stats from all adapters
$stats = [];
foreach ($this->cacheProviders as $cacheProvider) {
$stats[] = $cacheProvider->doGetStats();
}
return $stats;
}
}
|
