@Override
    public String toString() {
        return "ExponentialBackoff{" +
                "multiplier=" + multiplier +
                ", expMax=" + expMax +
                ", initialInterval=" + initialInterval +
                ", jitter=" + jitter +
                '}';
    }
A utility class for keeping the parameters and providing the value of exponential
retry backoff, exponential reconnect backoff, exponential timeout, etc.
<p>
The formula is:
<pre>Backoff(attempts) = random(1 - jitter, 1 + jitter) * initialInterval * multiplier ^ attempts</pre>
If {$code maxInterval} is less that {@code initialInterval}, a constant backoff of
{@code maxInterval} will be provided. The jitter will never cause the backoff to exceed
{@code maxInterval}.
<p>
This class is thread-safe.
clients/src/main/java/org/apache/kafka/common/utils/ExponentialBackoff.java