// Telephone action copies previous Telephone actions and appends it's own message to the response
// - Example of how an action can read response from previous actions
public class TelephoneAction extends ChainableAction {
    private String message;
    public TelephoneAction(String message) {
        this.message = message;
    }

    public override Type getType() {
        return TelephoneAction.class;
    }

    public override Type getResponseType() {
        return TelephoneResponse.class;
    }

    public override Object execute(Chainable chain) {
        //read past messages
        String s = '';
        for (ChainableLink link : chain.processedLinks) {
            if (link.completed) {
                TelephoneResponse prevResp = (TelephoneResponse) link.getResponse();
                s += prevResp.message;
            }
        }
        return new TelephoneResponse(s + message);
    }
}```

### Create and Run Chainable

```java
// Setup your "ChainLinks"
String[] words = new String[]{'Hello', 'World'};
for(Integer i = 0; i < words.size(); i++){
    String word  = words[i] + ' ';
    ChainableLink link = new ChainableLink(new TelephoneAction(word));
    links.add(link);
}

// Create the Chainable
Chainable chain = new Chainable(links);
String key = chain.key; //Save this somewhere if you want to check status / rerun

// enqueue execution
chain.enqueue();