InvokeOnHeaderStrategy (Camel :: API 3.20.9 API)

```
public interface InvokeOnHeaderStrategy
```
Pluggable strategy for invoking InvokeOnHeader.
Camel provides source code generated strategies via the camel maven tooling.

See Also:

InvokeOnHeader

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Object`	`invoke(Object target, String key, Exchange exchange, AsyncCallback callback)`	Invoke the method based on the header key

- Method Detail
  - invoke
```
Object invoke(Object target,
              String key,
              Exchange exchange,
              AsyncCallback callback)
       throws Exception
```
    Invoke the method based on the header key
    
    Parameters:
    
    target - the target such as a producer extending HeaderSelectorProducer
    
    key - the header key
    
    exchange - the exchange
    
    callback - the async callback
    
    Returns:
    
    option response from invoking the method, or null if the method is void if a value is returned, then this value is stored as result on the message body.
    
    Throws:
    
    Exception - is thrown if error invoking the method.