Configuring Sentinel Circuit Breakers

Default Configuration

To provide a default configuration for all of your circuit breakers create a Customizer bean that is passed a SentinelCircuitBreakerFactory or ReactiveSentinelCircuitBreakerFactory. The configureDefault method can be used to provide a default configuration.

@Bean
public Customizer<SentinelCircuitBreakerFactory> defaultCustomizer() {
	return factory -> factory.configureDefault(id -> new SentinelConfigBuilder(id)
			.build());
}

You can choose to provide default circuit breaking rules via SentinelConfigBuilder#rules(rules). You can also choose to load circuit breaking rules later elsewhere using DegradeRuleManager.loadRules(rules) API of Sentinel, or via Sentinel dashboard.

Reactive Example

@Bean
public Customizer<ReactiveSentinelCircuitBreakerFactory> defaultCustomizer() {
	return factory -> factory.configureDefault(id -> new SentinelConfigBuilder(id)
			.build());
}

Specific Circuit Breaker Configuration

Similarly to providing a default configuration, you can create a Customizer bean this is passed a SentinelCircuitBreakerFactory.

@Bean
public Customizer<SentinelCircuitBreakerFactory> slowCustomizer() {
	String slowId = "slow";
	List<DegradeRule> rules = Collections.singletonList(
		new DegradeRule(slowId).setGrade(RuleConstant.DEGRADE_GRADE_RT)
			.setCount(100)
			.setTimeWindow(10)
		);
	return factory -> factory.configure(builder -> builder.rules(rules), slowId);
}

Reactive Example

@Bean
public Customizer<ReactiveSentinelCircuitBreakerFactory> customizer() {
	List<DegradeRule> rules = Collections.singletonList(
		new DegradeRule().setGrade(RuleConstant.DEGRADE_GRADE_RT)
			.setCount(100)
			.setTimeWindow(10)
		);
	return factory -> factory.configure(builder -> builder.rules(rules), "foo", "bar");
}