[automatic failover] Add example for automatic failover #3568
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…he builder
- When using the builder without setting healthCheckStrategySupplier: Health checks will use PingStrategy.DEFAULT
- When explicitly setting to null: Health checks will be disabled (as documented)
- When setting to a custom supplier: Uses the custom health check strategy
Example Usage:
// Uses PingStrategy.DEFAULT for health checks
DatabaseConfig config1 = DatabaseConfig.builder(uri)
.weight(1.0f)
.build();
// Explicitly disables health checks
DatabaseConfig config2 = DatabaseConfig.builder(uri)
.healthCheckStrategySupplier(null)
.build();
// Uses custom health check strategy
DatabaseConfig config3 = DatabaseConfig.builder(uri)
.healthCheckStrategySupplier(customSupplier)
.build();
// To create DatabaseConfig use provided builder
DatabaseConfig config = DatabaseConfig.builder(redisURI)
.weight(1.5f)
.clientOptions(options)
.circuitBreakerConfig(cbConfig)
.healthCheckStrategySupplier(supplier)
.build();
// Minimal configuration with defaults
CircuitBreakerConfig config = CircuitBreakerConfig.builder().build();
// Custom configuration
CircuitBreakerConfig config = CircuitBreakerConfig.builder()
.failureRateThreshold(25.0f)
.minimumNumberOfFailures(500)
.metricsWindowSize(5)
.build();
// With custom tracked exceptions
Set<Class<? extends Throwable>> customExceptions = new HashSet<>();
customExceptions.add(RuntimeException.class);
CircuitBreakerConfig config = CircuitBreakerConfig.builder()
.failureRateThreshold(15.5f)
.minimumNumberOfFailures(200)
.trackedExceptions(customExceptions)
.metricsWindowSize(3)
.build();
//Combine add and remove
CircuitBreakerConfig config = CircuitBreakerConfig.builder()
.addTrackedExceptions(MyCustomException.class)
.removeTrackedExceptions(TimeoutException.class)
.build();
// Replace all tracked exceptions
Set<Class<? extends Throwable>> customExceptions = new HashSet<>();
customExceptions.add(RuntimeException.class);
customExceptions.add(IOException.class);
CircuitBreakerConfig config = CircuitBreakerConfig.builder()
.trackedExceptions(customExceptions)
.build();
atakavci
approved these changes
Dec 10, 2025
Configure DB1, DB2, and DB3 with NO_HEALTH_CHECK to prevent health check interference when testing circuit breaker failure detection.
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Co-authored-by: atakavci <a_takavci@yahoo.com>
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The code example showcases how to use the current API.