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<?php
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namespace Aws\EndpointV2;
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use Aws\EndpointV2\Ruleset\Ruleset;
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use Aws\Exception\UnresolvedEndpointException;
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use Aws\LruArrayCache;
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/**
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 * Given a service's Ruleset and client-provided input parameters, provides
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 * either an object reflecting the properties of a resolved endpoint,
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 * or throws an error.
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 */
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class EndpointProviderV2
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{
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    /** @var Ruleset */
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    private $ruleset;
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    /** @var LruArrayCache */
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    private $cache;
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    public function __construct(array $ruleset, array $partitions)
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    {
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        $this->ruleset = new Ruleset($ruleset, $partitions);
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        $this->cache = new LruArrayCache(100);
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    }
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    /**
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     * @return Ruleset
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     */
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    public function getRuleset()
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    {
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        return $this->ruleset;
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    }
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    /**
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     * Given a Ruleset and input parameters, determines the correct endpoint
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     * or an error to be thrown for a given request.
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     *
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     * @return RulesetEndpoint
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     * @throws UnresolvedEndpointException
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     */
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    public function resolveEndpoint(array $inputParameters)
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    {
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        $hashedParams = $this->hashInputParameters($inputParameters);
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        $match = $this->cache->get($hashedParams);
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        if (!is_null($match)) {
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            return $match;
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        }
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        $endpoint = $this->ruleset->evaluate($inputParameters);
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        if ($endpoint === false) {
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            throw new UnresolvedEndpointException(
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                'Unable to resolve an endpoint using the provider arguments: '
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                . json_encode($inputParameters)
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            );
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        }
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        $this->cache->set($hashedParams, $endpoint);
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        return $endpoint;
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    }
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    private function hashInputParameters($inputParameters)
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    {
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        return md5(serialize($inputParameters));
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    }
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}