Pipeline design pattern implementation using Spring Boot - spring-boot

Question

Can someone guide me as how to implement the Pipeline design pattern using Spring Boot?
I understand that each Pipe step has to be implemented as a #Service. I would like to know if #Ordered can be added to have the steps executed without explicitly wiring the individual #Service classes as the number of pipes in my case could exceed 10.

Answer 1

You can have something like that:
public interface Pipe{
void chain(Message input, Pipeline pipeline);
}
public class abstract AbstractPipe implements Pipe {
public void chain(Message input, Pipeline pipeline){
try {
//Business process of pipe1 (i.e. process the message and return response (Result of processing))
Response response = processMessage(input);
//Sucessful while processing
Message output = onSuccess(response, input);
pipeline.next(output);
}catch(Exception exception){
//Failure while processing
onError(exception, input);
//Maybe, we can continue
//with an alternative message
}
}
public abstract Message onSuccess(Response response, Message originalMessage);
public abstract void onError(Throwable error, Message input);
public abstract Response processMessage(Message input);
}
#Service
public class Pipe1 extends AbstractPipe {
// Implementation of abstract methods
}
#Service
public class Pipe2 extends AbstractPipe {
// Implementation of abstract methods
}
#Service
public class Pipe3 extends AbstractPipe {
// Implementation of abstract methods
}
public interface Message {
public Object get(String key);
}
public class MessageImpl implements Message {
private final Map<String, Object> index;
public MessageImpl(){...}
public void set(String key, Objetc value){...}
public Object get(String key){...}
}
The Pipeline is a chain of Pipes. Each pipe executes a command and tell the pipeline to continue with a new message.
I'm not sure that Spring has an annotation called #Ordered. Maybe you mean #Order which :
defines the sort order for an annotated component.
I'm not sure that it can add something to the Pipeline implementation.
Hope that helps.