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<?php
namespace Amp;
/**
* A NullCancellationToken can be used to avoid conditionals to check whether a token has been provided.
*
* Instead of writing
*
* ```php
* if ($token) {
* $token->throwIfRequested();
* }
* ```
*
* potentially multiple times, it allows writing
*
* ```php
* $token = $token ?? new NullCancellationToken;
*
* // ...
*
* $token->throwIfRequested();
* ```
*
* instead.
*/
final class NullCancellationToken implements CancellationToken
{
/** @inheritdoc */
public function subscribe(callable $callback): string
{
return "null-token";
}
/** @inheritdoc */
public function unsubscribe(string $id)
{
// nothing to do
}
/** @inheritdoc */
public function isRequested(): bool
{
return false;
}
/** @inheritdoc */
public function throwIfRequested()
{
// nothing to do
}
}