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<p>Some <code>CircuitBreaker</code> implementations such as <code>Resilience4JCircuitBreaker</code> call <code>customize</code> method every time <code>CircuitBreaker#run</code> is called.
It can be inefficient. In that case, you can use <code>CircuitBreaker#once</code> method. It is useful where calling <code>customize</code> many times doesn&#8217;t make sense,
for example, in case of <a href="https://resilience4j.readme.io/docs/circuitbreaker#section-consume-emitted-circuitbreakerevents">consuming Resilience4j&#8217;s events</a>.</p>
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<p>The following example shows the way for each <code>io.github.resilience4j.circuitbreaker.CircuitBreaker</code> to consume events.</p>
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<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">Customizer.once(circuitBreaker -&gt; {
circuitBreaker.getEventPublisher()
.onStateTransition(event -&gt; log.info("{}: {}", event.getCircuitBreakerName(), event.getStateTransition()));
}, CircuitBreaker::getName)</code></pre>
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