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Current File : /home/builderbox/www/vendor/doctrine/cache/lib/Doctrine/Common/Cache//ChainCache.php
<?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;
    }
}

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