Laravel Cache流程

记录一下，省的每次忘记都要重新看下源码

dd(Cache::get(1));exit();
Cache::put(1,2,3);exit();
dd(app('cache'));

这里注入了CACHE的门面类
class CacheServiceProvider extends ServiceProvider
{
    /**
     * Indicates if loading of the provider is deferred.
     *
     * @var bool
     */
    protected $defer = true;

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->singleton('cache', function ($app) {
            return new CacheManager($app);
        });

        $this->app->singleton('cache.store', function ($app) {
            return $app['cache']->driver();
        });

        $this->app->singleton('memcached.connector', function () {
            return new MemcachedConnector;
        });
    }

CacheManager->createRedisDriver->put

app = $app;
    }

    /**
     * Get a cache store instance by name.
     *
     * @param  string|null  $name
     * @return \Illuminate\Contracts\Cache\Repository
     */
    public function store($name = null)
    {
        $name = $name ?: $this->getDefaultDriver();

        return $this->stores[$name] = $this->get($name);
    }

    /**
     * Get a cache driver instance.
     *
     * @param  string  $driver
     * @return mixed
     */
    public function driver($driver = null)
    {
        return $this->store($driver);
    }

    /**
     * Attempt to get the store from the local cache.
     *
     * @param  string  $name
     * @return \Illuminate\Contracts\Cache\Repository
     */
    protected function get($name)
    {
        return $this->stores[$name] ?? $this->resolve($name);
    }

    /**
     * Resolve the given store.
     *
     * @param  string  $name
     * @return \Illuminate\Contracts\Cache\Repository
     *
     * @throws \InvalidArgumentException
     */
    protected function resolve($name)
    {
        $config = $this->getConfig($name);

        if (is_null($config)) {
            throw new InvalidArgumentException("Cache store [{$name}] is not defined.");
        }

        if (isset($this->customCreators[$config['driver']])) {
            return $this->callCustomCreator($config);
        } else {
            $driverMethod = 'create'.ucfirst($config['driver']).'Driver';

            if (method_exists($this, $driverMethod)) {
                return $this->{$driverMethod}($config);
            } else {
                throw new InvalidArgumentException("Driver [{$config['driver']}] is not supported.");
            }
        }
    }

    /**
     * Call a custom driver creator.
     *
     * @param  array  $config
     * @return mixed
     */
    protected function callCustomCreator(array $config)
    {
        return $this->customCreators[$config['driver']]($this->app, $config);
    }

    /**
     * Create an instance of the APC cache driver.
     *
     * @param  array  $config
     * @return \Illuminate\Cache\ApcStore
     */
    protected function createApcDriver(array $config)
    {
        $prefix = $this->getPrefix($config);

        return $this->repository(new ApcStore(new ApcWrapper, $prefix));
    }

    /**
     * Create an instance of the array cache driver.
     *
     * @return \Illuminate\Cache\ArrayStore
     */
    protected function createArrayDriver()
    {
        return $this->repository(new ArrayStore);
    }

    /**
     * Create an instance of the file cache driver.
     *
     * @param  array  $config
     * @return \Illuminate\Cache\FileStore
     */
    protected function createFileDriver(array $config)
    {
        return $this->repository(new FileStore($this->app['files'], $config['path']));
    }

    /**
     * Create an instance of the Memcached cache driver.
     *
     * @param  array  $config
     * @return \Illuminate\Cache\MemcachedStore
     */
    protected function createMemcachedDriver(array $config)
    {
        $prefix = $this->getPrefix($config);

        $memcached = $this->app['memcached.connector']->connect(
            $config['servers'],
            $config['persistent_id'] ?? null,
            $config['options'] ?? [],
            array_filter($config['sasl'] ?? [])
        );

        return $this->repository(new MemcachedStore($memcached, $prefix));
    }

    /**
     * Create an instance of the Null cache driver.
     *
     * @return \Illuminate\Cache\NullStore
     */
    protected function createNullDriver()
    {
        return $this->repository(new NullStore);
    }

    /**
     * Create an instance of the Redis cache driver.
     *
     * @param  array  $config
     * @return \Illuminate\Cache\RedisStore
     */
    protected function createRedisDriver(array $config)
    {
        $redis = $this->app['redis'];

        $connection = $config['connection'] ?? 'default';

        return $this->repository(new RedisStore($redis, $this->getPrefix($config), $connection));
    }

    /**
     * Create an instance of the database cache driver.
     *
     * @param  array  $config
     * @return \Illuminate\Cache\DatabaseStore
     */
    protected function createDatabaseDriver(array $config)
    {
        $connection = $this->app['db']->connection($config['connection'] ?? null);

        return $this->repository(
            new DatabaseStore(
                $connection, $config['table'], $this->getPrefix($config)
            )
        );
    }

    /**
     * Create a new cache repository with the given implementation.
     *
     * @param  \Illuminate\Contracts\Cache\Store  $store
     * @return \Illuminate\Cache\Repository
     */
    public function repository(Store $store)
    {
        $repository = new Repository($store);

        if ($this->app->bound(DispatcherContract::class)) {
            $repository->setEventDispatcher(
                $this->app[DispatcherContract::class]
            );
        }

        return $repository;
    }

    /**
     * Get the cache prefix.
     *
     * @param  array  $config
     * @return string
     */
    protected function getPrefix(array $config)
    {
        return $config['prefix'] ?? $this->app['config']['cache.prefix'];
    }

    /**
     * Get the cache connection configuration.
     *
     * @param  string  $name
     * @return array
     */
    protected function getConfig($name)
    {
        return $this->app['config']["cache.stores.{$name}"];
    }

    /**
     * Get the default cache driver name.
     *
     * @return string
     */
    public function getDefaultDriver()
    {
        return $this->app['config']['cache.default'];
    }

    /**
     * Set the default cache driver name.
     *
     * @param  string  $name
     * @return void
     */
    public function setDefaultDriver($name)
    {
        $this->app['config']['cache.default'] = $name;
    }

    /**
     * Register a custom driver creator Closure.
     *
     * @param  string    $driver
     * @param  \Closure  $callback
     * @return $this
     */
    public function extend($driver, Closure $callback)
    {
        $this->customCreators[$driver] = $callback->bindTo($this, $this);

        return $this;
    }

    /**
     * Dynamically call the default driver instance.
     *
     * @param  string  $method
     * @param  array   $parameters
     * @return mixed
     */
    public function __call($method, $parameters)
    {
        return $this->store()->$method(...$parameters);
    }
}

redis的门面类注入
class RedisServiceProvider extends ServiceProvider
{
    /**
     * Indicates if loading of the provider is deferred.
     *
     * @var bool
     */
    protected $defer = true;

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->singleton('redis', function ($app) {
            $config = $app->make('config')->get('database.redis');

            return new RedisManager(Arr::pull($config, 'client', 'predis'), $config);
        });

        $this->app->bind('redis.connection', function ($app) {
            return $app['redis']->connection();
        });
    }

class RedisManager implements Factory
{
    /**
     * The name of the default driver.
     *
     * @var string
     */
    protected $driver;

    /**
     * The Redis server configurations.
     *
     * @var array
     */
    protected $config;

    /**
     * The Redis connections.
     *
     * @var mixed
     */
    protected $connections;

    /**
     * Create a new Redis manager instance.
     *
     * @param  string  $driver
     * @param  array  $config
     * @return void
     */
    public function __construct($driver, array $config)
    {
        $this->driver = $driver;
        $this->config = $config;
    }

    /**
     * Get a Redis connection by name.
     *
     * @param  string|null  $name
     * @return \Illuminate\Redis\Connections\Connection
     */
    public function connection($name = null)
    {
        $name = $name ?: 'default';

        if (isset($this->connections[$name])) {
            return $this->connections[$name];
        }

        return $this->connections[$name] = $this->resolve($name);
    }

    /**
     * Resolve the given connection by name.
     *
     * @param  string|null  $name
     * @return \Illuminate\Redis\Connections\Connection
     *
     * @throws \InvalidArgumentException
     */
    public function resolve($name = null)
    {
        $name = $name ?: 'default';

        $options = $this->config['options'] ?? [];

        if (isset($this->config[$name])) {
            return $this->connector()->connect($this->config[$name], $options);
        }

        if (isset($this->config['clusters'][$name])) {
            return $this->resolveCluster($name);
        }

        throw new InvalidArgumentException(
            "Redis connection [{$name}] not configured."
        );
    }

    /**
     * Resolve the given cluster connection by name.
     *
     * @param  string  $name
     * @return \Illuminate\Redis\Connections\Connection
     */
    protected function resolveCluster($name)
    {
        $clusterOptions = $this->config['clusters']['options'] ?? [];

        return $this->connector()->connectToCluster(
            $this->config['clusters'][$name], $clusterOptions, $this->config['options'] ?? []
        );
    }

    /**
     * Get the connector instance for the current driver.
     *
     * @return \Illuminate\Redis\Connectors\PhpRedisConnector|\Illuminate\Redis\Connectors\PredisConnector
     */
    protected function connector()
    {
        switch ($this->driver) {
            case 'predis':
                return new Connectors\PredisConnector;
            case 'phpredis':
                return new Connectors\PhpRedisConnector;
        }
    }

    /**
     * Return all of the created connections.
     *
     * @return array
     */
    public function connections()
    {
        return $this->connections;
    }

    /**
     * Pass methods onto the default Redis connection.
     *
     * @param  string  $method
     * @param  array  $parameters
     * @return mixed
     */
    public function __call($method, $parameters)
    {
        return $this->connection()->{$method}(...$parameters);
    }
}

Repository 

store = $store;
    }

    /**
     * Determine if an item exists in the cache.
     *
     * @param  string  $key
     * @return bool
     */
    public function has($key)
    {
        return ! is_null($this->get($key));
    }

    /**
     * Retrieve an item from the cache by key.
     *
     * @param  string  $key
     * @param  mixed   $default
     * @return mixed
     */
    public function get($key, $default = null)
    {
        if (is_array($key)) {
            return $this->many($key);
        }

        $value = $this->store->get($this->itemKey($key));

        // If we could not find the cache value, we will fire the missed event and get
        // the default value for this cache value. This default could be a callback
        // so we will execute the value function which will resolve it if needed.
        if (is_null($value)) {
            $this->event(new CacheMissed($key));

            $value = value($default);
        } else {
            $this->event(new CacheHit($key, $value));
        }

        return $value;
    }

    /**
     * Retrieve multiple items from the cache by key.
     *
     * Items not found in the cache will have a null value.
     *
     * @param  array  $keys
     * @return array
     */
    public function many(array $keys)
    {
        $values = $this->store->many(collect($keys)->map(function ($value, $key) {
            return is_string($key) ? $key : $value;
        })->values()->all());

        return collect($values)->map(function ($value, $key) use ($keys) {
            return $this->handleManyResult($keys, $key, $value);
        })->all();
    }

    /**
     * {@inheritdoc}
     */
    public function getMultiple($keys, $default = null)
    {
        if (is_null($default)) {
            return $this->many($keys);
        }

        foreach ($keys as $key) {
            if (! isset($default[$key])) {
                $default[$key] = null;
            }
        }

        return $this->many($default);
    }

    /**
     * Handle a result for the "many" method.
     *
     * @param  array  $keys
     * @param  string  $key
     * @param  mixed  $value
     * @return mixed
     */
    protected function handleManyResult($keys, $key, $value)
    {
        // If we could not find the cache value, we will fire the missed event and get
        // the default value for this cache value. This default could be a callback
        // so we will execute the value function which will resolve it if needed.
        if (is_null($value)) {
            $this->event(new CacheMissed($key));

            return isset($keys[$key]) ? value($keys[$key]) : null;
        }

        // If we found a valid value we will fire the "hit" event and return the value
        // back from this function. The "hit" event gives developers an opportunity
        // to listen for every possible cache "hit" throughout this applications.
        $this->event(new CacheHit($key, $value));

        return $value;
    }

    /**
     * Retrieve an item from the cache and delete it.
     *
     * @param  string  $key
     * @param  mixed   $default
     * @return mixed
     */
    public function pull($key, $default = null)
    {
        return tap($this->get($key, $default), function ($value) use ($key) {
            $this->forget($key);
        });
    }

    /**
     * Store an item in the cache.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @param  \DateTimeInterface|\DateInterval|float|int  $minutes
     * @return void
     */
    public function put($key, $value, $minutes = null)
    {
        if (is_array($key)) {
            return $this->putMany($key, $value);
        }

        if (! is_null($minutes = $this->getMinutes($minutes))) {
            $this->store->put($this->itemKey($key), $value, $minutes);

            $this->event(new KeyWritten($key, $value, $minutes));
        }
    }

    /**
     * {@inheritdoc}
     */
    public function set($key, $value, $ttl = null)
    {
        $this->put($key, $value, $ttl);
    }

    /**
     * Store multiple items in the cache for a given number of minutes.
     *
     * @param  array  $values
     * @param  \DateTimeInterface|\DateInterval|float|int  $minutes
     * @return void
     */
    public function putMany(array $values, $minutes)
    {
        if (! is_null($minutes = $this->getMinutes($minutes))) {
            $this->store->putMany($values, $minutes);

            foreach ($values as $key => $value) {
                $this->event(new KeyWritten($key, $value, $minutes));
            }
        }
    }

    /**
     * {@inheritdoc}
     */
    public function setMultiple($values, $ttl = null)
    {
        $this->putMany($values, $ttl);
    }

    /**
     * Store an item in the cache if the key does not exist.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @param  \DateTimeInterface|\DateInterval|float|int  $minutes
     * @return bool
     */
    public function add($key, $value, $minutes)
    {
        if (is_null($minutes = $this->getMinutes($minutes))) {
            return false;
        }

        // If the store has an "add" method we will call the method on the store so it
        // has a chance to override this logic. Some drivers better support the way
        // this operation should work with a total "atomic" implementation of it.
        if (method_exists($this->store, 'add')) {
            return $this->store->add(
                $this->itemKey($key), $value, $minutes
            );
        }

        // If the value did not exist in the cache, we will put the value in the cache
        // so it exists for subsequent requests. Then, we will return true so it is
        // easy to know if the value gets added. Otherwise, we will return false.
        if (is_null($this->get($key))) {
            $this->put($key, $value, $minutes);

            return true;
        }

        return false;
    }

    /**
     * Increment the value of an item in the cache.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return int|bool
     */
    public function increment($key, $value = 1)
    {
        return $this->store->increment($key, $value);
    }

    /**
     * Decrement the value of an item in the cache.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return int|bool
     */
    public function decrement($key, $value = 1)
    {
        return $this->store->decrement($key, $value);
    }

    /**
     * Store an item in the cache indefinitely.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @return void
     */
    public function forever($key, $value)
    {
        $this->store->forever($this->itemKey($key), $value);

        $this->event(new KeyWritten($key, $value, 0));
    }

    /**
     * Get an item from the cache, or store the default value.
     *
     * @param  string  $key
     * @param  \DateTimeInterface|\DateInterval|float|int  $minutes
     * @param  \Closure  $callback
     * @return mixed
     */
    public function remember($key, $minutes, Closure $callback)
    {
        $value = $this->get($key);

        // If the item exists in the cache we will just return this immediately and if
        // not we will execute the given Closure and cache the result of that for a
        // given number of minutes so it's available for all subsequent requests.
        if (! is_null($value)) {
            return $value;
        }

        $this->put($key, $value = $callback(), $minutes);

        return $value;
    }

    /**
     * Get an item from the cache, or store the default value forever.
     *
     * @param  string   $key
     * @param  \Closure  $callback
     * @return mixed
     */
    public function sear($key, Closure $callback)
    {
        return $this->rememberForever($key, $callback);
    }

    /**
     * Get an item from the cache, or store the default value forever.
     *
     * @param  string   $key
     * @param  \Closure  $callback
     * @return mixed
     */
    public function rememberForever($key, Closure $callback)
    {
        $value = $this->get($key);

        // If the item exists in the cache we will just return this immediately and if
        // not we will execute the given Closure and cache the result of that for a
        // given number of minutes so it's available for all subsequent requests.
        if (! is_null($value)) {
            return $value;
        }

        $this->forever($key, $value = $callback());

        return $value;
    }

    /**
     * Remove an item from the cache.
     *
     * @param  string  $key
     * @return bool
     */
    public function forget($key)
    {
        return tap($this->store->forget($this->itemKey($key)), function () use ($key) {
            $this->event(new KeyForgotten($key));
        });
    }

    /**
     * {@inheritdoc}
     */
    public function delete($key)
    {
        return $this->forget($key);
    }

    /**
     * {@inheritdoc}
     */
    public function deleteMultiple($keys)
    {
        foreach ($keys as $key) {
            $this->forget($key);
        }

        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function clear()
    {
        return $this->store->flush();
    }

    /**
     * Begin executing a new tags operation if the store supports it.
     *
     * @param  array|mixed  $names
     * @return \Illuminate\Cache\TaggedCache
     *
     * @throws \BadMethodCallException
     */
    public function tags($names)
    {
        if (! method_exists($this->store, 'tags')) {
            throw new BadMethodCallException('This cache store does not support tagging.');
        }

        $cache = $this->store->tags($names);

        if (! is_null($this->events)) {
            $cache->setEventDispatcher($this->events);
        }

        return $cache->setDefaultCacheTime($this->default);
    }

    /**
     * Format the key for a cache item.
     *
     * @param  string  $key
     * @return string
     */
    protected function itemKey($key)
    {
        return $key;
    }

    /**
     * Get the default cache time.
     *
     * @return float|int
     */
    public function getDefaultCacheTime()
    {
        return $this->default;
    }

    /**
     * Set the default cache time in minutes.
     *
     * @param  float|int  $minutes
     * @return $this
     */
    public function setDefaultCacheTime($minutes)
    {
        $this->default = $minutes;

        return $this;
    }

    /**
     * Get the cache store implementation.
     *
     * @return \Illuminate\Contracts\Cache\Store
     */
    public function getStore()
    {
        return $this->store;
    }

    /**
     * Fire an event for this cache instance.
     *
     * @param  string  $event
     * @return void
     */
    protected function event($event)
    {
        if (isset($this->events)) {
            $this->events->dispatch($event);
        }
    }

    /**
     * Set the event dispatcher instance.
     *
     * @param  \Illuminate\Contracts\Events\Dispatcher  $events
     * @return void
     */
    public function setEventDispatcher(Dispatcher $events)
    {
        $this->events = $events;
    }

    /**
     * Determine if a cached value exists.
     *
     * @param  string  $key
     * @return bool
     */
    public function offsetExists($key)
    {
        return $this->has($key);
    }

    /**
     * Retrieve an item from the cache by key.
     *
     * @param  string  $key
     * @return mixed
     */
    public function offsetGet($key)
    {
        return $this->get($key);
    }

    /**
     * Store an item in the cache for the default time.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @return void
     */
    public function offsetSet($key, $value)
    {
        $this->put($key, $value, $this->default);
    }

    /**
     * Remove an item from the cache.
     *
     * @param  string  $key
     * @return void
     */
    public function offsetUnset($key)
    {
        $this->forget($key);
    }

    /**
     * Calculate the number of minutes with the given duration.
     *
     * @param  \DateTimeInterface|\DateInterval|float|int  $duration
     * @return float|int|null
     */
    protected function getMinutes($duration)
    {
        $duration = $this->parseDateInterval($duration);

        if ($duration instanceof DateTimeInterface) {
            $duration = Carbon::now()->diffInRealSeconds($duration, false) / 60;
        }

        return (int) ($duration * 60) > 0 ? $duration : null;
    }

    /**
     * Handle dynamic calls into macros or pass missing methods to the store.
     *
     * @param  string  $method
     * @param  array   $parameters
     * @return mixed
     */
    public function __call($method, $parameters)
    {
        if (static::hasMacro($method)) {
            return $this->macroCall($method, $parameters);
        }

        return $this->store->$method(...$parameters);
    }

    /**
     * Clone cache repository instance.
     *
     * @return void
     */
    public function __clone()
    {
        $this->store = clone $this->store;
    }
}


RedisStore缓存STORE
redis = $redis;
        $this->setPrefix($prefix);
        $this->setConnection($connection);
    }

    /**
     * Retrieve an item from the cache by key.
     *
     * @param  string|array  $key
     * @return mixed
     */
    public function get($key)
    {
        $value = $this->connection()->get($this->prefix.$key);

        return ! is_null($value) ? $this->unserialize($value) : null;
    }

    /**
     * Retrieve multiple items from the cache by key.
     *
     * Items not found in the cache will have a null value.
     *
     * @param  array  $keys
     * @return array
     */
    public function many(array $keys)
    {
        $results = [];

        $values = $this->connection()->mget(array_map(function ($key) {
            return $this->prefix.$key;
        }, $keys));

        foreach ($values as $index => $value) {
            $results[$keys[$index]] = ! is_null($value) ? $this->unserialize($value) : null;
        }

        return $results;
    }

    /**
     * Store an item in the cache for a given number of minutes.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @param  float|int  $minutes
     * @return void
     */
    public function put($key, $value, $minutes)
    {
        $this->connection()->setex(
            $this->prefix.$key, (int) max(1, $minutes * 60), $this->serialize($value)
        );
    }

    /**
     * Store multiple items in the cache for a given number of minutes.
     *
     * @param  array  $values
     * @param  float|int  $minutes
     * @return void
     */
    public function putMany(array $values, $minutes)
    {
        $this->connection()->multi();

        foreach ($values as $key => $value) {
            $this->put($key, $value, $minutes);
        }

        $this->connection()->exec();
    }

    /**
     * Store an item in the cache if the key doesn't exist.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @param  float|int  $minutes
     * @return bool
     */
    public function add($key, $value, $minutes)
    {
        $lua = "return redis.call('exists',KEYS[1])<1 and redis.call('setex',KEYS[1],ARGV[2],ARGV[1])";

        return (bool) $this->connection()->eval(
            $lua, 1, $this->prefix.$key, $this->serialize($value), (int) max(1, $minutes * 60)
        );
    }

    /**
     * Increment the value of an item in the cache.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @return int
     */
    public function increment($key, $value = 1)
    {
        return $this->connection()->incrby($this->prefix.$key, $value);
    }

    /**
     * Decrement the value of an item in the cache.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @return int
     */
    public function decrement($key, $value = 1)
    {
        return $this->connection()->decrby($this->prefix.$key, $value);
    }

    /**
     * Store an item in the cache indefinitely.
     *
     * @param  string  $key
     * @param  mixed   $value
     * @return void
     */
    public function forever($key, $value)
    {
        $this->connection()->set($this->prefix.$key, $this->serialize($value));
    }

    /**
     * Get a lock instance.
     *
     * @param  string  $name
     * @param  int  $seconds
     * @return \Illuminate\Contracts\Cache\Lock
     */
    public function lock($name, $seconds = 0)
    {
        return new RedisLock($this->connection(), $this->prefix.$name, $seconds);
    }

    /**
     * Remove an item from the cache.
     *
     * @param  string  $key
     * @return bool
     */
    public function forget($key)
    {
        return (bool) $this->connection()->del($this->prefix.$key);
    }

    /**
     * Remove all items from the cache.
     *
     * @return bool
     */
    public function flush()
    {
        $this->connection()->flushdb();

        return true;
    }

    /**
     * Begin executing a new tags operation.
     *
     * @param  array|mixed  $names
     * @return \Illuminate\Cache\RedisTaggedCache
     */
    public function tags($names)
    {
        return new RedisTaggedCache(
            $this, new TagSet($this, is_array($names) ? $names : func_get_args())
        );
    }

    /**
     * Get the Redis connection instance.
     *
     * @return \Predis\ClientInterface
     */
    public function connection()
    {
        return $this->redis->connection($this->connection);
    }

    /**
     * Set the connection name to be used.
     *
     * @param  string  $connection
     * @return void
     */
    public function setConnection($connection)
    {
        $this->connection = $connection;
    }

    /**
     * Get the Redis database instance.
     *
     * @return \Illuminate\Contracts\Redis\Factory
     */
    public function getRedis()
    {
        return $this->redis;
    }

    /**
     * Get the cache key prefix.
     *
     * @return string
     */
    public function getPrefix()
    {
        return $this->prefix;
    }

    /**
     * Set the cache key prefix.
     *
     * @param  string  $prefix
     * @return void
     */
    public function setPrefix($prefix)
    {
        $this->prefix = ! empty($prefix) ? $prefix.':' : '';
    }

    /**
     * Serialize the value.
     *
     * @param  mixed  $value
     * @return mixed
     */
    protected function serialize($value)
    {
        return is_numeric($value) ? $value : serialize($value);
    }

    /**
     * Unserialize the value.
     *
     * @param  mixed  $value
     * @return mixed
     */
    protected function unserialize($value)
    {
        return is_numeric($value) ? $value : unserialize($value);
    }
}