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- 鍙互榪涜綾誨瀷杞崲
- 闀挎湡榪愯錛岄櫎闈炶瑕佹眰涓
- 嫻佺▼涓殑姣忕鎿嶄綔鍙互鍦ㄦ柊鐨勭嚎紼嬩腑鎵ц
- 鍙互姝ｅ父涓錛屽鏋滀腑閫旀湁寮傚父錛屽垯璇ユ祦紼嬩篃浼?xì)涓?/li>
- 瑕乻ubscribe錛屾祦紼嬫墠寮濮嬭鍚姩
- 鍙互鍒嗗壊鎴愬悇涓瓙嫻佺▼
- 鍙互鑱氬悎瀛愭祦紼?/li>
- Mono鍙戦佷竴涓暟鎹紝灝卞彂閫佷腑姝俊鍙?/li>
- Flux鍙戦佷換鎰忔暟鎹紝鐢辯▼搴忓喅瀹氫綍鏃跺彂閫佷腑姝俊鍙?/li>
緙栫▼鍒欐瘮杈冪畝鍗曪紝鍏堟牴鎹笉鍚岀殑鏁版嵁綾誨瀷瀹氫箟涓嶅悓鐨凢lux鎴朚ono錛屼笟鍔℃搷浣滅敤Function鍖呰鍚庯紝鏀懼湪map/flatmap涓紝鍐嶈皟鐢╯ubscribe鍚姩嫻佺▼銆?/div>
]]>
Supplier beans, or functions that only publish messages in Spring Cloud Stream, are a bit special in that they aren't triggered by the receiving of events like Function or Consumer beans. This means that you often need a way to trigger them to be executed periodically.
For imperative functions the framework by default "polls" a Supplier function every 1 second, but that duration is configurable using the spring.cloud.stream.poller.fixed-delay property.
However, for reactive functions supplying a Flux it is only triggered once by default. This is because a Flux itself is potentially an infinite stream of events so in many cases it will only need to be triggered once. But don't worry, if you want to periodically trigger a reactive Supplier because you are producing a finite stream of events you can still do so using @PollableBean. This annotation then allows you to configure how often the function is triggered using the same spring.cloud.stream.poller.fixed-delay property!
One example use case here could be periodically querying a data store and publishing each entry/row as an event. The number of rows in your data store is a finite number at any given time.
Example code:
@PollableBean
public Supplier<Flux<String>> stringSupplier() { return () -> Flux.just("foo","bar","baz"); }
public Supplier<Flux<String>> stringSupplier() { return () -> Flux.just("foo","bar","baz"); }
Reference:
https://solace.community/discussion/360/pollablebean-for-reactive-suppliers-in-spring-cloud-stream
]]>
閭ｄ箞鍦⊿PRING CLOUD STREAM涓紝濡傛灉瑕佷粠闈濻PRING CLOUD STREAM浠ｇ爜鍙戦丮ESSAGE鍒癝PRING CLOUD STREAM紼嬪簭錛岄氬父灝辮鍏堥氱煡妗嗘灦鑷姩鐢熸垚涓涓猄OURCE銆?br />
application.property
spring.cloud.stream.source=supplier
spring.cloud.stream.bindings.supplier-out-0.destination=notification-events
spring.cloud.stream.bindings.supplier-out-0.destination=notification-events
java
streamBridge.send("supplier-out-0", userDto);
Reference:
https://blog.devgenius.io/event-driven-microservices-with-spring-cloud-stream-e034eee3f394
]]>
@ServiceActivator(inputChannel = "my-destination.my-group.errors")
public void handleError(ErrorMessage message) {
Throwable throwable = message.getPayload();
log.error("鎴幏寮傚父", throwable);
Message<?> originalMessage = message.getOriginalMessage();
assert originalMessage != null;
log.info("鍘熷娑堟伅浣?nbsp;= {}", new String((byte[]) originalMessage.getPayload()));
}
public void handleError(ErrorMessage message) {
Throwable throwable = message.getPayload();
log.error("鎴幏寮傚父", throwable);
Message<?> originalMessage = message.getOriginalMessage();
assert originalMessage != null;
log.info("鍘熷娑堟伅浣?nbsp;= {}", new String((byte[]) originalMessage.getPayload()));
}
璇︽儏鍙傝冿細(xì)
https://www.itmuch.com/spring-cloud/spring-cloud-stream-error-handling/
]]>
緇勪歡鍦板潃錛?br />https://github.com/spring-cloud/stream-applications/tree/main/functions
鐗規(guī)畩緇勪歡錛屽皢FUNCTION鍙樻垚HTTP ENDPOINTS錛?br />https://github.com/spring-cloud/spring-cloud-function/tree/main/spring-cloud-starter-function-web
https://github.com/spring-cloud/spring-cloud-function/tree/main/spring-cloud-starter-function-webflux
]]>
寮曞叆浜嗘柊鍚嶈瘝錛歋upplier銆丗unction涓嶤onsumer銆傚疄闄呬笂榪欏嚑涓被鍙涓篈dapter錛屽鏋滀箣鍓嶅凡緇忔湁瀛樺湪鐨凷ervice綾伙紝涓旀柟娉曞悕涓哄悇縐嶅悇鏍鳳紝鍙互閲嶆柊鍖呰鎴怱upplier銆丗unction涓嶤onsumer錛屽茍鍦ㄥ浐瀹氱殑鏂規(guī)硶鍚嶏細(xì)apply/get/accept涓皟鐢⊿ervice鐨勬柟娉曘?br />
Supplier
褰撳湪閰嶇疆鏂囦歡涓敞鍏ユ綾誨瀷鐨凚ean錛屽茍鍦╯pring.cloud.stream.function.definition鍔犲叆姝ean鐨勫悕縐幫紝SPRING CLOUD STREAM灝變細(xì)甯綘鐢熸垚涓涓狾utput MessageChannel錛屽茍榪炴帴涓婃Bean錛屽悗緇彧闇瑕佸湪BINDDING涓姞鍏ュ搴旂殑Destination Name錛屽嵆鍙悜B(tài)ROKER鍙戞秷鎭簡銆?br />Consumer
褰撳湪閰嶇疆鏂囦歡涓敞鍏ユ綾誨瀷鐨凚ean錛屽茍鍦╯pring.cloud.stream.function.definition鍔犲叆姝ean鐨勫悕縐幫紝SPRING CLOUD STREAM灝變細(xì)甯綘鐢熸垚涓涓狪nput MessageChannel錛屽茍榪炴帴涓婃Bean錛屽悗緇彧闇瑕佸湪BINDDING涓姞鍏ュ搴旂殑Destination Name錛屽嵆鍙敹鍒癇ROKER鎺ㄩ佸叧浜庢Destination鐨勬秷鎭簡銆?br />Function
褰撳湪閰嶇疆鏂囦歡涓敞鍏ユ綾誨瀷鐨凚ean錛屽茍鍦╯pring.cloud.stream.function.definition鍔犲叆姝ean鐨勫悕縐幫紝SPRING CLOUD STREAM灝變細(xì)甯綘鐢熸垚涓涓狪nput鍜孫utput MessageChannel錛屽茍榪炴帴涓婃Bean錛屽悗緇彧闇瑕佸湪BINDDING涓垎鍒Input鍜孫utput MessageChannel鍔犲叆瀵瑰簲鐨凞estination Name1/Name2錛屽嵆鍙敹鍒癇ROKER鎺ㄩ佸叧浜庢Destination鐨勬秷鎭紝涔熷彲浠ュ悜B(tài)ROKER鍙戞秷鎭簡銆?br />涓嶴PRING INTEGRATION鐨勬暣鍚?/h2>濡傛灉瑕佸娑堟伅榪涜澶嶆潅澶勭悊錛屽鎷嗗垎娑堟伅銆佽仛鍚堟秷鎭両F ELSE娑堟伅絳夛紝灝辮鍊熷姪SPRING INTEGRATION浜嗐?br />
@Bean
public IntegrationFlow upperCaseFlow(LoanService loanService) {
return IntegrationFlows
//turn this IntegrationFlow as a gateway, here is a Function interface
//with loadCheckerFunction as bean name
.from(LoadCheckerFunction.class, gateway -> gateway.beanName("loadCheckerFunction"))
.handle(loanService, "check")
.logAndReply(LoggingHandler.Level.WARN);
}
public interface LoadCheckerFunction extends Function<Loan, Loan>{
}
IntegrationFlows.from(Class<?> serviceInterface)鏄彲浠ュ皢鏈琁ntegrationFlow鍖呰鎴恠erviceInterface鐨勫疄鐜扮被錛屽鏋滆皟鐢ㄦ鎺ュ彛錛屾渶緇堜細(xì)榪斿洖IntegrationFlow鏈鍚庝竴涓楠ょ殑瀹炰綋錛屽鏋滆繖涓猻erviceInterface鏄疐unction鐨勮瘽錛屽垰濂藉拰SPRING CLOUD STREAM瀵規(guī)帴涓娿?br />
鍚庣畫鍦╯pring.cloud.stream.function.definition鍔犲叆姝ean鐨勫悕縐發(fā)oadCheckerFunction錛孲PRING CLOUD STREAM灝變細(xì)甯綘鐢熸垚涓涓狪nput鍜孫utput MessageChannel錛屽茍榪炴帴涓婃Bean錛屽啀鍦˙INDDING涓垎鍒Input鍜孫utput MessageChannel鍔犲叆瀵瑰簲鐨凞estination Name1/Name2錛屽嵆鍙敹鍒癇ROKER鎺ㄩ佸叧浜庢Destination鐨勬秷鎭紝涔熷彲浠ュ悜B(tài)ROKER鍙戞秷鎭?br />
application.yaml
# This setting can increase or decrease the rate of message production (1000 = 1s)
# spring.cloud.stream.poller.fixed-delay=1000
# This setting can control which function method in our code will be triggered if there are multiple
# spring.cloud.function.definition=supplyLoan
# Give the autogenerated binding a friendlier name
spring:
application:
name: loan-check-rabbit
banner:
location: classpath:/banner-rabbit.txt
cloud:
stream:
function.definition: loadCheckerFunction
#BindingProperties
bindings:
loadCheckerFunction-in-0:
destination: queue.pretty.log.messages
binder: local_rabbit
loadCheckerFunction-out-0:
destination: queue.pretty.approved.messages
binder: local_rabbit
#BinderProperties
binders:
local_rabbit:
type: rabbit
environment:
spring:
rabbitmq:
host: 10.80.27.69
port: 5672
username: guest
password: guest
virtual-host: my-virtual-host
Reference
https://spring.io/blog/2019/10/25/spring-cloud-stream-and-spring-integration
]]>
public IntegrationFlow upperCaseFlow(LoanService loanService) {
return IntegrationFlows
//turn this IntegrationFlow as a gateway, here is a Function interface
//with loadCheckerFunction as bean name
.from(LoadCheckerFunction.class, gateway -> gateway.beanName("loadCheckerFunction"))
.handle(loanService, "check")
.logAndReply(LoggingHandler.Level.WARN);
}
public interface LoadCheckerFunction extends Function<Loan, Loan>{
}
# spring.cloud.stream.poller.fixed-delay=1000
# This setting can control which function method in our code will be triggered if there are multiple
# spring.cloud.function.definition=supplyLoan
# Give the autogenerated binding a friendlier name
spring:
application:
name: loan-check-rabbit
banner:
location: classpath:/banner-rabbit.txt
cloud:
stream:
function.definition: loadCheckerFunction
#BindingProperties
bindings:
loadCheckerFunction-in-0:
destination: queue.pretty.log.messages
binder: local_rabbit
loadCheckerFunction-out-0:
destination: queue.pretty.approved.messages
binder: local_rabbit
#BinderProperties
binders:
local_rabbit:
type: rabbit
environment:
spring:
rabbitmq:
host: 10.80.27.69
port: 5672
username: guest
password: guest
virtual-host: my-virtual-host
鍗矨寰湇鍔″簲鐢ㄥ皢鏁版嵁鍙戦佸埌MESSAGE BROKER涓殑鏌愪釜DESTINATION錛屾DESTINATION鏄箍鎾瀷錛岄潪鐐瑰鐐瑰瀷銆侭寰湇鍔″簲鐢ㄨ闃呮DESTINATION錛屽綋鏈夋柊MESSAGE鍒拌揪姝ESTINATION鏃訛紝MESSAGE BROKER浼?xì)灏嗘MESSAGE鎺ㄩ佺粰B搴旂敤銆傛墍鏈夊姝ESSAGE鏈夐渶瑕佺殑搴旂敤鍧囧彲璁㈤槄錛屼粠鑰屾敹鍒版MESSAGE銆?br />
SPRING CLOUD 涓璄VENT DRIVEN鐨勬鏋跺氨鏄疭PRING CLOUD STREAM銆傚叾搴曞眰鏄嬌鐢⊿PRING INTEGRATION瀹炵幇銆?br />
SPRING CLOUD STREAM鏈変互涓嬫柊鍚嶈瘝錛?br />
- BINDER錛?/li>
- CHANNEL
- SOURCE
- SINK
- BIDDING
- EnableBinding
- 娑堣垂鑰呯兢緇?/li>
- PARTITION
榪欐牱浣跨敤灝卞緢綆鍗曚簡錛屽彧瑕佸彇寰桹UTPUT CHANNEL錛屽氨鍙互鍙戦丮ESSAGE錛屽皢浠ｇ爜鍏寵仈鍒癐NPUT CHANNEL錛屽氨鑳藉湪鏀跺埌MESSAGE鏃訛紝鐩稿叧浠ｇ爜灝變細(xì)琚墽琛屻?br />
]]>