blocks|key|1817899|text|要获得简单明了的circuit+breaker+implementation，请查看Failsafe。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1817900|CircuitBreaker+breaker+=+new+CircuitBreaker()
++.withFailureThreshold(5)
++.withSuccessThreshold(3)
++.withDelay(1,+TimeUnit.MINUTES);

Failsafe.with(breaker).run(()+->+connect());|code-block|syntax|javascript|1817901|再简单不过了。|1817902|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/jhalterman/failsafe#circuit-breakers|1|https://github.com/jhalterman/failsafe^0|8|U|0|16|8|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

For a simple, straightforward <a href="https://github.com/jhalterman/failsafe#circuit-breakers" rel="noreferrer">circuit breaker implementation</a>, check out <a href="https://github.com/jhalterman/failsafe" rel="noreferrer">Failsafe</a>. Ex:

<pre><code>CircuitBreaker breaker = new CircuitBreaker()
 .withFailureThreshold(5)
 .withSuccessThreshold(3)
 .withDelay(1, TimeUnit.MINUTES);

Failsafe.with(breaker).run(() -&gt; connect());
</code></pre>

Doesn't get much simpler.

blocks|key|1817933|text|对于几种类型的轻量级断路器，Apache+commons有一些实现，这里是a+link+to+the+docs|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1817934|该项目提供了EventCountCircuitBreaker和ThresholdCircuitBreaker类，以及一个抽象AbstractCircuitBreaker，以便您可以实现自己的类。|style|CODE|1817935|代码是开放源码的，并且是hosted+at+github的，所以任何试图实现该模式的人都应该至少看一眼。|1817936|entityMap|0|LINK|mutability|MUTABLE|url|https://commons.apache.org/|1|https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/concurrent/CircuitBreaker.html|2|https://github.com/apache/commons-lang/tree/master/src/main/java/org/apache/commons/lang3/concurrent^0|E|E|0|11|I|1|0|6|O|V|N|1Q|M|0|C|G|2|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]|$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@$A|13|B|14|F|G]|$A|15|B|16|F|G]|$A|17|B|18|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|J|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]|T|$5|M|N|O|C|$P|U]]]]

<a href="https://commons.apache.org/" rel="noreferrer">Apache commons</a> has some implementations for several types of lightweight circuit breakers, here's <a href="https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/concurrent/CircuitBreaker.html" rel="noreferrer">a link to the docs</a>

The project provides the <code>EventCountCircuitBreaker</code> and <code>ThresholdCircuitBreaker</code> classes, and an abstract <code>AbstractCircuitBreaker</code> so you could implement your own.

The code is open sources and is <a href="https://github.com/apache/commons-lang/tree/master/src/main/java/org/apache/commons/lang3/concurrent" rel="noreferrer">hosted at github</a>, so anyone attempting to implement the pattern should at least take a peek.

blocks|key|1817896|text|Spring+cloud提供了一些与Hystrix的有趣集成。你也许应该去看看...|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1817897|entityMap|0|LINK|mutability|MUTABLE|url|http://projects.spring.io/spring-cloud/|1|https://github.com/Netflix/Hystrix^0|0|C|0|I|7|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

<a href="http://projects.spring.io/spring-cloud/" rel="noreferrer">Spring cloud</a> provides some interesting integration with <a href="https://github.com/Netflix/Hystrix" rel="noreferrer">Hystrix</a>. You should probably have a look into it...

blocks|key|4506197|text|关于模式本身|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4506198|您可以在Martin+Fowler's+blog上获得有关此模式的许多有用信息。它包含ruby实现以及其他语言实现的参考。|offset|length|4506199|关于java+spring实现。|4506200|请检查JRugged+library。它包含spring中的断路器实现以及其他设计模式。|4506201|entityMap|0|LINK|mutability|MUTABLE|url|http://martinfowler.com/bliki/CircuitBreaker.html|1|https://github.com/Comcast/jrugged^0|0|4|K|0|0|0|3|F|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]]]

<h2>Regarding the pattern itself</h2>

You can obtain a lot of useful information about this pattern at <a href="http://martinfowler.com/bliki/CircuitBreaker.html" rel="nofollow">Martin Fowler's blog</a>. It contains ruby implementation as well as references for implementation in other languages.

<h2>Regarding the java spring implementation</h2>

Please check the <a href="https://github.com/Comcast/jrugged" rel="nofollow">JRugged library</a>.
It contains the Circuit Breaker implementation in spring as well as other design patterns.

blocks|key|4506251|text|要使用Hystrix，实际上不需要使用Spring+cloud或Spring+boot。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4506252|使用hystrix-javanica使得Hystrix与普通的旧Spring一起使用也变得很容易。|offset|length|4506253|以下是回退方法的示例(默认情况下，getMessageTimeout和getMessageException这两个方法都失败)：|4506254|@Configuration
@ComponentScan
@EnableAspectJAutoProxy
public+class+CircuitBreakingWithHystrix+{

++@Bean
++public+HystrixCommandAspect+hystrixAspect()+{
++++return+new+HystrixCommandAspect();
++}

++public+static+void+main(String[]+args)+throws+Throwable+{
++++ApplicationContext+ctx
++++++=+new+AnnotationConfigApplicationContext(CircuitBreakingWithHystrix.class);
++++ExampleService+ex+=+ctx.getBean(ExampleService.class);
++++for+(int+i+=+0;+i+<+1000;+i%2B%2B)+{
++++++System.out.println(ex.getMessageException());
++++++System.out.println(ex.getMessageTimeout());
++++}
++}

++@Service
++class+ExampleService+{

++++/*
+++++*+The+default+Hystrix+timeout+is+1+second.+So+the+default+
+++++*+version+of+this+method+will+always+fail.++
+++++*+Adding+the+@HystrixProperty+will+cause+
+++++*+the+method+to+succeed.
+++++*/
++++@HystrixCommand(
++++++commandProperties+=+{+
++++++//@HystrixProperty(name+=+EXECUTION_ISOLATION_THREAD_TIMEOUT_IN_MILLISECONDS,
++++++//+++++++++++++++++value+=+"5000")
++++++},
++++++fallbackMethod+=+"messageFallback"
++++)
++++public+String+getMessageTimeout()+{
++++++try+{
++++++++//Pause+for+4+seconds
++++++++Thread.sleep(4000);
++++++}+catch+(InterruptedException+ex)+{
++++++++//+Do+something+clever+with+this
++++++}
++++++return+"result";
++++}

++++@HystrixCommand(
++++++fallbackMethod+=+"messageFallback")
++++public+String+getMessageException()+{
++++++throw+new+RuntimeException("Bad+things+happened");
++++}

++++private+String+messageFallback(Throwable+hre)+{
++++++return+"fallback";
++++}

++}|code-block|syntax|javascript|4506255|还可以检查发送到回退方法的throwable，以确定方法调用失败的原因。|4506256|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Netflix/Hystrix/tree/master/hystrix-contrib/hystrix-javanica^0|0|2|G|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

You don't actually need to be using Spring cloud or Spring boot to use Hystrix. 
Using <a href="https://github.com/Netflix/Hystrix/tree/master/hystrix-contrib/hystrix-javanica" rel="nofollow noreferrer">hystrix-javanica</a> makes it easy to use Hystrix with plain old Spring too.

Here is an example of fallback methods (both methods, getMessageTimeout and getMessageException, fail by default):

<pre><code>@Configuration
@ComponentScan
@EnableAspectJAutoProxy
public class CircuitBreakingWithHystrix {

 @Bean
 public HystrixCommandAspect hystrixAspect() {
 return new HystrixCommandAspect();
 }

 public static void main(String[] args) throws Throwable {
 ApplicationContext ctx
 = new AnnotationConfigApplicationContext(CircuitBreakingWithHystrix.class);
 ExampleService ex = ctx.getBean(ExampleService.class);
 for (int i = 0; i &lt; 1000; i++) {
 System.out.println(ex.getMessageException());
 System.out.println(ex.getMessageTimeout());
 }
 }

 @Service
 class ExampleService {

 /*
 * The default Hystrix timeout is 1 second. So the default 
 * version of this method will always fail. 
 * Adding the @HystrixProperty will cause 
 * the method to succeed.
 */
 @HystrixCommand(
 commandProperties = { 
 //@HystrixProperty(name = EXECUTION_ISOLATION_THREAD_TIMEOUT_IN_MILLISECONDS,
 // value = "5000")
 },
 fallbackMethod = "messageFallback"
 )
 public String getMessageTimeout() {
 try {
 //Pause for 4 seconds
 Thread.sleep(4000);
 } catch (InterruptedException ex) {
 // Do something clever with this
 }
 return "result";
 }

 @HystrixCommand(
 fallbackMethod = "messageFallback")
 public String getMessageException() {
 throw new RuntimeException("Bad things happened");
 }

 private String messageFallback(Throwable hre) {
 return "fallback";
 }

 }
</code></pre>

You can also examine the throwable sent to the fallback method to identify why the method call failed.

blocks|key|2393834|text|你可以看看JCircuitBreaker。那里的实现实现了类似断路器的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2393835|请注意，这不是该模式的1:1实现，因为它没有定义像“半开”这样的固定状态。相反，它基于当前应用程序状态(使用所谓的“中断策略”)做出决定(断路器应该是打开的还是关闭的)。然而，应该可以定义这样的“中断策略”来评估失败阈值-因此也可以使用JCircuitBreaker实现原始模式。|2393836|entityMap|0|LINK|mutability|MUTABLE|url|http://secodo.net/projects/jcircuitbreaker/^0|5|F|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

You can have a look at <a href="http://secodo.net/projects/jcircuitbreaker/" rel="nofollow noreferrer" title="JCircuitBreaker">JCircuitBreaker</a> . The implementation there implements circuit breaker like approach. 

Please note that this is not 1:1 implementation of the pattern because it does not define fixed states like "half-open". Instead it makes the decision (if the breaker should be open or closed) basing on current application state (using so called "break strategy"). Nevertheless it should be possible to define such a "break strategy" which evaluates failures thresholds - so it should be possible to also implement original pattern using JCircuitBreaker.

I have tried unsuccessfully to implement circuit breaker pattern, <a href="http://en.wikipedia.org/wiki/Circuit_breaker_design_pattern" rel="noreferrer">here</a>, in Java using Spring framework. 

How can you implement circuit breaker pattern by Java and Spring?

Circuit breaker design pattern implementation

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我曾尝试使用Spring框架在Java语言中实现断路器模式，但未获成功。如何用Java和Spring实现断路器模式？

问断路器设计模式实现
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