英文:
Spring integration how to poll cron expression adapter in xml
问题
I'm trying to migrate cron scheduler that takes in 2 cron expressions (Expression and Timezone).
我正在尝试迁移一个需要两个cron表达式（Expression和Timezone）的定时任务调度器。
I checked the spring integration docs and there seems to be a constructor that takes in exactly what I need https://docs.spring.io/spring-integration/api/org/springframework/integration/dsl/PollerFactory.html#cron(java.lang.String,java.util.TimeZone) PollerSpec cron(String cronExpression, TimeZone timeZone).
我查看了Spring Integration文档，似乎有一个构造函数正好符合我的需求：https://docs.spring.io/spring-integration/api/org/springframework/integration/dsl/PollerFactory.html#cron(java.lang.String,java.util.TimeZone) PollerSpec cron(String cronExpression, TimeZone timeZone)。
But, I'm not sure how to implement it in xml.
但是，我不确定如何在XML中实现它。
<int:inbound-channel-adapter channel="cronInput">
<int:integration:PollerSpec cronExpression=${bless.cron.expression}" timeZone= "${bless.cron.timezone}"/>
</int:inbound-channel-adapter>
<int:channel id="cronInput" />
Here's how I implemented it and my understanding is it's taking the message payload from executing the cron expression and putting it in the pipe/channel cronInput, so If I create another endpoint like activator, I can create an input channel and use the payload.
这是我实现的方式，我的理解是它从执行cron表达式中获取消息有效负载，并将其放入管道/通道cronInput中，因此，如果我创建另一个类似激活器的端点，我可以创建一个输入通道并使用有效负载。
英文:
I'm trying to migrate cron scheduler that takes in 2 cron expressions (Expression and Timezone).
I checked the spring integration docs and there seems to be a constructor that takes in exactly what I need https://docs.spring.io/spring-integration/api/org/springframework/integration/dsl/PollerFactory.html#cron(java.lang.String,java.util.TimeZone) PollerSpec cron(String cronExpression, TimeZone timeZone). But, I'm not sure how to implement it in xml.
<int:inbound-channel-adapter channel="cronInput">
<int:integration:PollerSpec cronExpression=${bless.cron.expression}" timeZone= "${bless.cron.timezone}"/>
</int:inbound-channel-adapter>
<int:channel id="cronInput" />
Here's how I implemented it and my understanding is it's taking the message payload from executing the cron expression and putting it in the pipe/channel cronInput, so If I create another endpoint like activator, I can create an input channel and use the payload.
答案1
得分: 1
The PollerSpec 是用于 Java DSL 的。它与 XML 无关。确实没有 PollerSpec 自定义 XML 标签。
<int:inbound-channel-adapter> 包含一个 <int:poller> 子元素：
<xsd:element name="poller" type="basePollerType"/>
此 poller 自定义标签带有以下属性：
<xsd:attribute name="cron" type="xsd:string">
<xsd:annotation>
<xsd:documentation>Cron 触发器。</xsd:documentation>
</xsd:annotation>
</xsd:attribute>
然而，没有 TimeZone 属性来涵盖您的其他用例。
不过，<poller> 可以配置一个 trigger 属性：
<xsd:attribute name="trigger" type="xsd:string">
<xsd:annotation>
<xsd:appinfo>
<tool:annotation kind="ref">
<tool:expected-type type="org.springframework.scheduling.Trigger"/>
</tool:annotation>
</xsd:appinfo>
</xsd:annotation>
</xsd:attribute>
因此，对于您的用例，您可以提供额外的 CronTrigger 并在提到的引用中使用其 Bean 名称：
<int:inbound-channel-adapter channel="cronInput">
<int:poller trigget="cronTrigger"/>
</int:inbound-channel-adapter>
<beans:bean id="cronTrigger" class="org.springframework.scheduling.support.CronTrigger">
<beans:constructor-arg value="${bless.cron.expression}"/>
<beans:constructor-arg value="${bless.cron.timezone}"/>
</beans:bean>
从这里，我提出一个问题：为什么您要尝试使用 XML 来实现这些内容呢？为什么不直接使用 Java DSL，或者至少使用注解配置呢？
英文:
The PollerSpec is for Java DSL. It has nothing to do with an XML. And there is indeed no PollerSpec custom XML tag.
The <int:inbound-channel-adapter> comes with a <int:poller> sub-element:
<xsd:element name="poller" type="basePollerType"/>
This poller custom tag comes with this attribute:
<xsd:attribute name="cron" type="xsd:string">
<xsd:annotation>
<xsd:documentation>Cron trigger.</xsd:documentation>
</xsd:annotation>
</xsd:attribute>
However there is no TimeZone attribute to cover your other use-case.
Nevertheless the <poller> can be configured with a trigger attribute:
<xsd:attribute name="trigger" type="xsd:string">
<xsd:annotation>
<xsd:appinfo>
<tool:annotation kind="ref">
<tool:expected-type type="org.springframework.scheduling.Trigger"/>
</tool:annotation>
</xsd:appinfo>
</xsd:annotation>
</xsd:attribute>
So, for your use case you can provide an extra CronTrigger and use its bean name in the mentioned reference:
<int:inbound-channel-adapter channel="cronInput">
<int:poller trigget="cronTrigger"/>
</int:inbound-channel-adapter>
<beans:bean id="cronTrigger" class="org.springframework.scheduling.support.CronTrigger">
<beans:constructor-arg value="${bless.cron.expression}"/>
<beans:constructor-arg value="${bless.cron.timezone}"/>
</beans:bean>
From here the question from me: why do you try to implement this stuff with an XML?
Why just don't go ahead and just deal with Java DSL or at least an Annotations configuration?
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