Java 骆驼选择示例
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Camel Choice by Example
提问by IAmYourFaja
I have 2 POJOs:
我有 2 个 POJO：
public class Witch {
private Broom broom;
private List<Spell> spells;
// constructors, getters/setters, etc.
}
public class ValidatedWitches {
private List<Witch> goodWitches
private List<Witch> badWitches;
// constructors, getters/setters, etc.
}
I have a Camel processor I wrote that will produce a ValidatedWitchesinstance (which again, consists of 2 List<Witch>):
我有一个我写的 Camel 处理器，它会产生一个ValidatedWitches实例（同样由 2 组成List<Witch>）：
public class WitchValidator implements Processor {
@Override
public void process(Exchange exchange) {
List<Witch> witchesToValidate = (List<Witch>)exchange.getIn().getBody();
ValidatedWitches validated = validate(witchesToValidate);
exchange.getOut().setBody(validated);
}
private ValidatedWitches validate(List<Witch> toValidate) {
// For each witch, determines if it is a good witch, or a bad witch,
// and places it on an appropriate list.
List<Witch> good = new ArrayList<Witch>();
List<Witch> bad = new ArrayList<Witch>();
// etc...
return new ValidatedWitches(good, bad);
}
}
I now want to routemy list of good witches 1 way, and my list of bad witches another way:
我现在想以一种方式路由我的好女巫列表，并以另一种方式路由我的坏女巫列表：
<route id="witch-route">
<!-- Everything before my WitchValidator component... -->
<to uri="bean:witchValidator?method=process" />
<choice>
<when>
<simple>???</simple>
<to uri="direct:goodWitches" />
</when>
<when>
<simple>???</simple>
<to uri="direct:badWitches" />
</when>
</choice>
</route>
What can I put inside my <choice>to take the ValidatedWitches.getGoodWitches()and route them to direct:goodWitches, and to take the ValidatedWitches.getBadWitches()and route them to direct:badWitches?
我可以在我的里面放什么<choice>来获取ValidatedWitches.getGoodWitches()和路由它们direct:goodWitches，以及将ValidatedWitches.getBadWitches()它们路由到direct:badWitches什么？
采纳答案by bgossit
A <choice> is either one or the other, so in your example you can only reach one destination URI. Therefore you may need to add a <split>before the <choice>so that you have two separate messages being evaluated.
A <choice> 是其中之一，因此在您的示例中，您只能到达一个目标 URI。因此，您可能需要在<split>之前添加，<choice>以便评估两个单独的消息。
See splitterfor your options there, for example you may want to create your own POJO with a method that returns a list of two ValidatedWitches objects - one with the "goodWitches" collection populated only and one with the "badWitches" collection populated only.
请参阅splitter那里的选项，例如，您可能希望使用返回两个 ValidatedWitches 对象列表的方法创建自己的 POJO - 一个只填充“goodWitches”集合，一个只填充“badWitches”集合。
There are many predicateoptions available, but an easy one would be to check if each array was empty.
有许多可用的谓词选项，但一个简单的方法是检查每个数组是否为空。
Then your route could look something like this:
那么您的路线可能如下所示：
<to uri="bean:witchValidator?method=process" />
<split>
<method beanType="SPLITTER_CLASS_NAME" method="SPLITTER_METHOD" />
<choice>
<when>
<simple>${body.goodWitches.size} > 0</simple>
<to uri="direct:goodWitches" />
</when>
<when>
<simple>${body.badWitches.size} > 0</simple>
<to uri="direct:badWitches" />
</when>
</choice>
</split>
Key points:
关键点：
- Splitter should return a collection of two or more objects
- Choice needs to be able to distinguish between the split objects
- Splitter 应该返回两个或多个对象的集合
- 选择需要能够区分拆分的对象
