Apache Camel Bean 中的动态 PropertyInjection

Question

I'm using the @PropertyInject annotation to get properties from the application.properties file to use in my beans.
This normally works fine, but now I need to be able to change the injected property based on a header value. In my head it looks something like this:

@PropertyInject(PROPERTY_NAME)  
private String property;

public void pickProperty(String msgVersion) {
        if (msgVersion.equals("A")) {
            PROPERTY_NAME = "property.firstType.name";  
        } else {
            PROPERTY_NAME = "property.secondType.name";
        }
    }

I've considered just injecting both properties and deciding in the main method which one to use, but that seems like a roundabout way of doing things and will get a bit bloated if more versions are added.
Is there an easy way this can be done?

Answer 1

now I need to be able to change the injected property based on a header value

Properties and Beans are created on application startup and typically do not change while the application is running. They both have application scope.

Header values on the other hand can change for every message that is processed by your application.

As you suggested yourself: You can inject both properties into the Bean and provide a method that is called once per message to get the correct value

@PropertyInject(PROPERTY_A)  
private String propertyA;
@PropertyInject(PROPERTY_B)  
private String propertyB;

// called for every message processing
public String pickProperty(@Header("msgVersion") String msgVersion) {
    if (msgVersion.equals("A")) {
        return propertyA;
    } else {
        return propertyB;
    }
}

This is not at all a workaround, but simply a method that returns a different result based on the input.