英文:
Spring-Integration DSL transform() method using name of a bean as the transformer
问题
When creating an IntegrationFlow that uses from(), channel(), or gateway(), I can refer to a channel by simply giving the String name of the channel. However, with a transform() operation using transformers that are beans, I have to include those Autowired beans in the constructor. This can be fastidious when there are a large number of transformations in the flow.
Is there a simple way of referring to a Bean used by a transform() without autowiring the bean in the constructor?
@Componentpublic class DoubleIntegerValueTransformer implements GenericTransformer<Integer, Integer> {@Overridepublic Integer transform(Integer source) {return source * 2;}}
@Componentpublic class AutowiredTransformerFlows {// Would like to eliminate the constructor and local instance variableprivate final DoubleIntegerValueTransformer doubleIntegerValueTransformer;public AutowiredTransformerFlows(DoubleIntegerValueTransformer doubleIntegerValueTransformer) {this.doubleIntegerValueTransformer = doubleIntegerValueTransformer;}@Bean(name = "autowiredTransformerFlow")IntegrationFlow usesBeanAsTransformer() {return IntegrationFlows.from("autowiredTransformChannel").filter("(payload % 2) == 1", discardReturnsCurrentMessage()).transform(doubleIntegerValueTransformer).get();}}
英文:
When creating an IntegrationFlow that uses from() or channel() or gateway(), I can refer to a channel by simply giving the String name of the channel. However, with a transform() operation using transformers that are beans, I have to include those Autowired beans in the constructor. This can be fastidious when then are a large number of transformations in the flow.
Is there a simple way of referring to a Bean used by a transform() without autowiring the bean in the constructor?
@Componentpublic class DoubleIntegerValueTransformer implements GenericTransformer<Integer, Integer> {@Overridepublic Integer transform(Integer source) {return source * 2;}}
@Componentpublic class AutowiredTransformerFlows {// Would like to eliminate the constructor and local instance variableprivate final DoubleIntegerValueTransformer doubleIntegerValueTransformer;public AutowiredTransformerFlows(DoubleIntegerValueTransformer doubleIntegerValueTransformer) {this.doubleIntegerValueTransformer = doubleIntegerValueTransformer;}@Bean(name = "autowiredTransformerFlow")IntegrationFlow usesBeanAsTransformer() {return IntegrationFlows.from("autowiredTransformChannel").filter("(payload % 2) == 1", discardReturnsCurrentMessage()).transform(doubleIntegerValueTransformer).get();}}
答案1
得分: 2
只需在bean工厂方法中添加一个参数：
@Bean(name = "autowiredTransformerFlow")IntegrationFlow usesBeanAsTransformer(DoubleIntegerValueTransformer doubleIntegerValueTransformer) {return IntegrationFlows.from("autowiredTransformChannel").filter("(payload % 2) == 1", discardReturnsCurrentMessage()).transform(doubleIntegerValueTransformer).get();}
该bean应该在@Configuration类中，而不是在@Component类中。
英文:
Just add a parameter to the bean factory method:
@Bean(name = "autowiredTransformerFlow")IntegrationFlow usesBeanAsTransformer(DoubleIntegerValueTransformer doubleIntegerValueTransformer) {return IntegrationFlows.from("autowiredTransformChannel").filter("(payload % 2) == 1", discardReturnsCurrentMessage()).transform(doubleIntegerValueTransformer).get();}
The bean should be in a @Configuration class, not a @Component class.
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