Amazon AWS SDK Guida di Installazione Scaricare il pdf (Pagina 46)

namespace MyApp\FakeWaiters

{

use Aws\Common\Waiter\AbstractResourceWaiter;

class SleptThreeTimes extends AbstractResourceWaiter

{

public function doWait()

{

if ($this->attempts < 3) {

echo "Need to sleep…\n";

return false;

} else {

echo "Now I've slept 3 times.\n";

return true;

}

namespace

{

use Aws\S3\S3Client;

use Aws\Common\Waiter\WaiterClassFactory;

$s3Client = S3Client::factory();

$compositeFactory = $s3Client->getWaiterFactory();

$compositeFactory->addFactory(new WaiterClassFactory('MyApp\FakeWaiters'));

$waiter = $s3Client->waitUntilSleptThreeTimes();

}

The result of this code should look like the following:

Need to sleep…

Now I've slept 3 times.

Waiter Definitions

The waiters that are included in the SDK are defined in the service description for their client. They are defined using

a configuration DSL (domain-specific language) that describes the default wait intervals, wait conditions, and how to

check or poll the resource to resolve the condition.

This data is automatically consumed and used by the Aws\Common\Waiter\WaiterConfigFactory class

when a client is instantiated so that the waiters defined in the service description are available to the client.

The following is an excerpt of the Amazon Glacier service description that defines the waiters provided by

Aws\Glacier\GlacierClient.

return array(

// ...

'waiters' => array(

'__default__' => array(

'interval' => 3,

'max_attempts' => 15,

'__VaultState' => array(

'operation' => 'DescribeVault',

Waiters

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Amazon AWS SDK Guida di Installazione Pagina 46

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