jralph/retry

A simple library to retry things.

PHP Retry

A simple library to retry commands in php., _(*1)

Installation

This package is available through composer., _(*2)

composer require jralph/retry

Basic Use

The library includes a simple helper function for ease of use., _(*3)

Note: On a failure to succeed in running the command, a Jralph\Retry\RetryException will be thrown., _(*4)

mixed retry (int|callable $attempts , callable $command [, callable $onError = null])

Parameters

• $attempts: The number of times to attempt a command.
  • If a callable is provided, the retry will continue until this closure returns true.
• $command: The command to run each time.
• $onError: An optional callback to run each time the $command fails.

Example

<?php

use function Jralph\Retry\retry;

$result = retry(3, function (int $attempt) {
    // Throwing an error as an example....first 2 attempts will fail.
    if ($attempt < 2) {
        throw new Exception('Just throwing an error as an example!');
    }

    return 'Hello World!';
});

// Outputs 'Hello World!'
echo $result;

Advanced Use / Object Use

If you want more flexibility over the retry tool, you can use the Retry object directly and ignore the helper function., _(*5)

The Retry object is fully chainable to make things simple., _(*6)

<?php

use Jralph\Retry\Retry;
use Jralph\Retry\Command;

$retry = new Retry(new Command(function (int $attempt) {
    // Throwing an error as an example....first 2 attempts will fail.
    if ($attempt < 2) {
        throw new Exception('Just throwing an error as an example!');
    }

    return 'Hello World!';
}));

$result = $retry->attempts(3)->run();

// Outputs 'Hello World!'
echo $result;

Available Methods

• new Retry(Command $command); The Command object to run as the command.
• $retry->attempts(int $attempts); The maximum number of times to attempt the command. Note, an attempt count of 0 will run for ever!
• $retry->wait(int $seconds); The number of seconds to wait between attempts.
• $retry->until(callable $until); Retry until the result of $until returns true. Note: Works well with $retry->attempts(0);
  • Accepts $attempt as the first parameter, giving the current number of attempts.
  • Accepts $response as the second parameter, giving the response of the last attempt.
• $retry->onlyIf(callable $onlyIf); Retry only if the $onlyIf returns true.
  • Accepts $attempt as the first parameter, giving the current number of attempts.
  • Accepts $response as the second parameter, giving the response of the last attempt.
• $retry->onError(callable $onError); A callback to run each time the retry fails.
  • Accepts $attempt as the first parameter, giving the current number of attempts.
  • Accepts $response as the second parameter, giving the response of the last attempt.
• $retry->run(); Run the command using the specified setup.

Change Log

• 2.0.0
  • Removing of deprecated methods.
  • Removal of once, twice, thrice, forever methods in favour of using attempts(int $attempts).
  • Constructor only accepts Command objects.
• 1.2.0
  • Updated to php 7.1+.
  • Dprecated command method in favour of passing a command object into the constructor.
• 1.1.1
  • Changed all methods using \Closure to use callable instead.
• 1.1.0
  • Added wait(int $seconds); method.