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<?php

/*

* Copyright 2013 Google Inc.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License 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.

*/

include_once "templates/base.php";

echo pageHeader("Batching Queries");

/************************************************

We're going to use the simple access to the

books API again as an example, but this time we

will batch up two queries into a single call.

************************************************/

require_once realpath(dirname(__FILE__) . '/../src/Google/autoload.php');

/************************************************

We create the client and set the simple API

access key. If you comment out the call to

setDeveloperKey, the request may still succeed

using the anonymous quota.

************************************************/

$client = new Google_Client();

$client->setApplicationName("Client_Library_Examples");

$apiKey = "<YOUR_API_KEY>"; // Change to your API key.

// Warn if the API key isn't changed!

if (strpos($apiKey, "<") !== false) {

echo missingApiKeyWarning();

exit;

} else {

$client->setDeveloperKey($apiKey);

$service = new Google_Service_Books($client);

/************************************************

To actually make the batch call we need to

enable batching on the client - this will apply

globally until we set it to false. This causes

call to the service methods to return the query

rather than immediately executing.

************************************************/

$client->setUseBatch(true);

/************************************************

We then create a batch, and add each query we

want to execute with keys of our choice - these

keys will be reflected in the returned array.

************************************************/

$batch = new Google_Http_Batch($client);

$optParams = array('filter' => 'free-ebooks');

$req1 = $service->volumes->listVolumes('Henry David Thoreau', $optParams);

$batch->add($req1, "thoreau");

$req2 = $service->volumes->listVolumes('George Bernard Shaw', $optParams);

$batch->add($req2, "shaw");

/************************************************

Executing the batch will send all requests off

at once.

************************************************/

$results = $batch->execute();

echo "<h3>Results Of Call 1:</h3>";

foreach ($results['response-thoreau'] as $item) {

echo $item['volumeInfo']['title'], "<br /> \n";

}

echo "<h3>Results Of Call 2:</h3>";

foreach ($results['response-shaw'] as $item) {

echo $item['volumeInfo']['title'], "<br /> \n";

}

}

echo pageFooter(__FILE__);