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A retry function for PHP.
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| <?php | |
| require_once dirname(__FILE__) . '/../lib/simpletest/autorun.php'; | |
| // Retries $f (A function) with arguments ($args as array) | |
| // 3 ($retries) times after 10 secs $delay | |
| // Usage: | |
| // retry( 'function_name', array('arg1', 'arg2'), 15, 5 ); | |
| // #=> Retries function_name 5 times with arg1 and $arg2 as arguments at interval of 15 secs | |
| function retry($f, $args = null, $delay = 10, $retries = 3) | |
| { | |
| try { | |
| if ( is_null( $args ) ) | |
| return $f(); | |
| if ( is_array( $args ) ) | |
| return call_user_func_array( $f, $args ) | |
| return call_user_func_array( $f, array( $args ) ); | |
| } catch ( Exception $e ) { | |
| if ( $retries > 0 ) { | |
| sleep( $delay ); | |
| return retry( $f, $delay, $retries - 1 ); | |
| } else { | |
| throw $e; | |
| } | |
| } | |
| } | |
| class RetryTest extends UnitTestCase | |
| { | |
| function testRetryWithNoExceptions() | |
| { | |
| $name = "Bob"; | |
| $result = retry( | |
| function () use ($name) { | |
| return $name . "!"; | |
| }, | |
| 0.1 | |
| ); | |
| $this->assertEqual("Bob!", $result); | |
| } | |
| function testRetryWithException() | |
| { | |
| $fail = true; | |
| $result = retry( | |
| function () use (&$fail) { | |
| if ($fail) { | |
| $fail = false; | |
| throw new Exception("Boom!"); | |
| } else { | |
| return "Woo!"; | |
| } | |
| }, | |
| 0.1 | |
| ); | |
| $this->assertEqual("Woo!", $result); | |
| } | |
| function testRetryTriesTheExpectedNumberOfTimes() | |
| { | |
| $count = 0; | |
| try { | |
| retry( | |
| function () use (&$count) { | |
| $count += 1; | |
| throw new Exception("Boom!"); | |
| }, | |
| 0.1 | |
| ); | |
| } catch (Exception $e) { | |
| } | |
| $this->assertEqual(4, $count); | |
| } | |
| function testRetryWithConstantFailure() | |
| { | |
| $this->expectException(new PatternExpectation("/I will never work./")); | |
| $result = retry( | |
| function () { | |
| throw new Exception("I will never work."); | |
| }, | |
| 0.1 | |
| ); | |
| } | |
| } |
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