<commit_before><?php
/**
 * Copyright 2010-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 * http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

namespace Aws\Common\Client;

use Aws\Common\Aws;
use Aws\Common\Credentials\Credentials;
use Aws\Common\Credentials\CredentialsInterface;
use Aws\Common\Enum\ClientOptions as Options;
use Aws\Common\Exception\InvalidArgumentException;
use Aws\Common\Signature\EndpointSignatureInterface;
use Aws\Common\Signature\SignatureInterface;
use Aws\Common\Signature\SignatureListener;
use Aws\Common\Waiter\WaiterClassFactory;
use Aws\Common\Waiter\CompositeWaiterFactory;
use Aws\Common\Waiter\WaiterFactoryInterface;
use Aws\Common\Waiter\WaiterConfigFactory;
use Guzzle\Common\Collection;
use Guzzle\Service\Client;
use Guzzle\Service\Description\ServiceDescriptionInterface;

/**
 * Abstract AWS client
 */
abstract class AbstractClient extends Client implements AwsClientInterface
{
    /**
     * @var CredentialsInterface AWS credentials
     */
    protected $credentials;

    /**
     * @var SignatureInterface Signature implementation of the service
     */
    protected $signature;

    /**
     * @var WaiterFactoryInterface Factory used to create waiter classes
     */
    protected $waiterFactory;

    /**
     * {@inheritdoc}
     */
    public static function getAllEvents()
    {
        return array_merge(Client::getAllEvents(), array(
            'client.region_changed',
            'client.credentials_changed',
        ));
    }

    /**
     * @param CredentialsInterface $credentials AWS credentials
     * @param SignatureInterface   $signature   Signature implementation
     * @param Collection           $config      Configuration options
     *
     * @throws InvalidArgumentException if an endpoint provider isn't provided
     */
    public function __construct(CredentialsInterface $credentials, SignatureInterface $signature, Collection $config)
    {
        // Bootstrap with Guzzle
        parent::__construct($config->get(Options::BASE_URL), $config);
        $this->credentials = $credentials;
        $this->signature = $signature;

        // Make sure the user agent is prefixed by the SDK version
        $this->setUserAgent('aws-sdk-php2/' . Aws::VERSION, true);

        // Add the event listener so that requests are signed before they are sent
        $dispatcher = $this->getEventDispatcher();
        $dispatcher->addSubscriber(new SignatureListener($credentials, $signature));

        if ($backoff = $config->get(Options::BACKOFF)) {
            $dispatcher->addSubscriber($backoff, -255);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function __call($method, $args = null)
    {
        if (substr($method, 0, 9) == 'waitUntil') {
            // Allow magic method calls for waiters (e.g. $client->waitUntil<WaiterName>($resource, $options))
            array_unshift($args, substr($method, 9));
<commit_msg>Remove default value for  parameter<commit_after><?php
/**
 * Copyright 2010-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 * http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

namespace Aws\Common\Client;

use Aws\Common\Aws;
use Aws\Common\Credentials\Credentials;
use Aws\Common\Credentials\CredentialsInterface;
use Aws\Common\Enum\ClientOptions as Options;
use Aws\Common\Exception\InvalidArgumentException;
use Aws\Common\Signature\EndpointSignatureInterface;
use Aws\Common\Signature\SignatureInterface;
use Aws\Common\Signature\SignatureListener;
use Aws\Common\Waiter\WaiterClassFactory;
use Aws\Common\Waiter\CompositeWaiterFactory;
use Aws\Common\Waiter\WaiterFactoryInterface;
use Aws\Common\Waiter\WaiterConfigFactory;
use Guzzle\Common\Collection;
use Guzzle\Service\Client;
use Guzzle\Service\Description\ServiceDescriptionInterface;

/**
 * Abstract AWS client
 */
abstract class AbstractClient extends Client implements AwsClientInterface
{
    /**
     * @var CredentialsInterface AWS credentials
     */
    protected $credentials;

    /**
     * @var SignatureInterface Signature implementation of the service
     */
    protected $signature;

    /**
     * @var WaiterFactoryInterface Factory used to create waiter classes
     */
    protected $waiterFactory;

    /**
     * {@inheritdoc}
     */
    public static function getAllEvents()
    {
        return array_merge(Client::getAllEvents(), array(
            'client.region_changed',
            'client.credentials_changed',
        ));
    }

    /**
     * @param CredentialsInterface $credentials AWS credentials
     * @param SignatureInterface   $signature   Signature implementation
     * @param Collection           $config      Configuration options
     *
     * @throws InvalidArgumentException if an endpoint provider isn't provided
     */
    public function __construct(CredentialsInterface $credentials, SignatureInterface $signature, Collection $config)
    {
        // Bootstrap with Guzzle
        parent::__construct($config->get(Options::BASE_URL), $config);
        $this->credentials = $credentials;
        $this->signature = $signature;

        // Make sure the user agent is prefixed by the SDK version
        $this->setUserAgent('aws-sdk-php2/' . Aws::VERSION, true);

        // Add the event listener so that requests are signed before they are sent
        $dispatcher = $this->getEventDispatcher();
        $dispatcher->addSubscriber(new SignatureListener($credentials, $signature));

        if ($backoff = $config->get(Options::BACKOFF)) {
            $dispatcher->addSubscriber($backoff, -255);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function __call($method, $args)
    {
        if (substr($method, 0, 9) == 'waitUntil') {
            // Allow magic method calls for waiters (e.g. $client->waitUntil<WaiterName>($resource, $options))
            array_unshift($args, substr($method, 9));

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