inline

What it is

inline is a tiny java api/framework that helps you to use the chain of responsibility pattern through annotations. It sits on top of apache commons chain.

Config

You just need to add "br.com.inline" package to your spring package scan.

Code example

Chain definition

Define the chain and its commands.
Should be annotated it with @Chain from br.com.inline.annotation package passing its command classes into commands parameter.

@Chain(qualifier = "chain1", commands = {
        Command1.class,
        Command2.class
})
public final class Chain1 {
}

Context definition

Define context used across chain commands.
Should extends ContextBase from org.apache.commons.chain.impl package.

public class Context1 extends ContextBase {
    // Declare any attributes you need across commands
}

Commands definition

Define chain's commands.
Should be annotated with @Command from br.com.inline.annotation package.
Should extends AbstractCommand from br.com.inline.command package passing a class that extends ContextBase.
Return true from execute method if you want to interrupt the flow, false to proceed.

@Command
public class Command1 extends AbstractCommand<Context1> {

    @Override
    protected boolean execute(Context1 context) throws Exception {
        return false;
    }
}

Chain start

Autowired ChainLocator from br.com.inline package into your spring component.
Use ChainLocator to get your chain by the qualifier attribute defined on @Chain annotation.

@Service
public class ChainService {

    @Autowired
    private ChainLocator chainLocator;
    
    public final void startChain() {
        final Context1 context = new Context1();
        final ChainBase chain = chainLocator.getChain("chain1");
        try {
            chain.execute(context);
        } catch(Exception e /*Any exceptions that your commands may throw*/) {
        
        }
    }
}

lacau/inline