retrying-callable

Wrap any Callable to retry it with configurable retry and wait policies.

Usage:

		import static com.jloisel.concurrent.retry.RetryPolicies.*;
		import static com.jloisel.concurrent.backoff.BackOffPolicies.*;
		
		final Callable<T> callable = ...;
		final RetryOnFailureCallableBuilder<T> b = new RetryOnFailureCallableBuilder<>(callable);
		
		final Callable<T> retrying = b
			.retry(attempts(3))
			.backoff(sleep(5, TimeUnit.SECONDS))
			.build();