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1 efrain 1 
<?php
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namespace Aws\Retry;
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use Aws\Retry\Exception\ConfigurationException;
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class Configuration implements ConfigurationInterface
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{
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    private $mode;
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    private $maxAttempts;
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    private $validModes = [
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        'legacy',
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        'standard',
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        'adaptive'
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    ];
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    public function __construct($mode = 'legacy', $maxAttempts = 3)
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    {
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        $mode = strtolower($mode);
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        if (!in_array($mode, $this->validModes)) {
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            throw new ConfigurationException("'{$mode}' is not a valid mode."
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                . " The mode has to be 'legacy', 'standard', or 'adaptive'.");
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        }
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        if (!is_numeric($maxAttempts)
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            || intval($maxAttempts) != $maxAttempts
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            || $maxAttempts < 1
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        ) {
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            throw new ConfigurationException("The 'maxAttempts' parameter has"
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                . " to be an integer >= 1.");
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        }
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        $this->mode = $mode;
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        $this->maxAttempts = intval($maxAttempts);
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    }
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    /**
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     * {@inheritdoc}
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     */
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    public function getMode()
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    {
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        return $this->mode;
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    }
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    /**
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     * {@inheritdoc}
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     */
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    public function getMaxAttempts()
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    {
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        return $this->maxAttempts;
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    }
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    /**
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     * {@inheritdoc}
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     */
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    public function toArray()
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    {
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        return [
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            'mode' => $this->getMode(),
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            'max_attempts' => $this->getMaxAttempts(),
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        ];
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    }
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}