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69 lines
2.0 KiB
Markdown
69 lines
2.0 KiB
Markdown
3 years ago
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# Sentinel Feign Circuit Breaker Example
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## Project description
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OpenFeign integrates Sentinel circuit breaker implementation
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## sample
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1. add dependency
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```xml
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<!-- requires spring cloud 2020.0.4 and above -->
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-openfeign</artifactId>
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</dependency>
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```
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2. add configuration to config center
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```yaml
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feign:
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circuitbreaker:
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enabled: true # Enable feign circuit breaker support
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sentinel:
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default-rule: default # Default rule name
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rules:
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# Default rule, valid for all feign clients
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default:
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- grade: 2 # Downgrade based on number of exceptions
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count: 1
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timeWindow: 15 # Time to half-open state after downgrade
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statIntervalMs: 1000
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minRequestAmount: 1
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# Only valid for feign client user
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user:
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- grade: 2
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count: 1
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timeWindow: 15
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statIntervalMs: 1000
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minRequestAmount: 1
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# Only valid for the method feignMethod of the feign client user
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# Parentheses are parameter types, separated by multiple commas, such as user#method(boolean,String,Map)
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"[user#feignMethod(boolean)]":
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- grade: 2
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count: 1
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timeWindow: 10
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statIntervalMs: 1000
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minRequestAmount: 1
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```
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## Verify
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Startup project
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Verify that the default feign client takes effect.
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First visit http:localhost/test/default/false 2 times
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and then visit http:localhost/test/default/true, the circuit breaker is open
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Verify that the specified feign client takes effect.
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First visit http:localhost/test/feign/false 2 times
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and then visit http:localhost/test/feign/true, the circuit breaker is open
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Verify that the specified method of feign client takes effect.
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First visit http://localhost/test/feignMethod/false 2 times
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and then visit http://localhost/test/feignMethod/true, the circuit breaker is open
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## Rules are dynamically refreshed
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Modify the rules of the configuration center, and then access the above interface
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