问函数接口的回调接口

EN

public class MessageReceived {
    private final Map<String, Researcher> researchers = new HashMap<>();

    public void receive(String researcherName, ResearchData researchData) {
        if (!researchers.containsKey(researcherName)) {

            researchers.put(researcherName, new Researcher(new ResearchCallback() {
                @Override
                public void discoveredResearch(ResearchData researchData, Map<Object, String> discovered) {

                    // iterate discovered
                    discovered.forEach((object, stringData) -> {
                        // do something
                    });
                }
            }));
        }

        researchers.get(researcherName).research(researchData);
    }
}

public interface ResearcherCallback {

    void discoveredResearch(ResearchData data, Map<Object, String> discovered);
}

public class Researcher {
    private final ResearchCallback callback;

    public Researcher(ResearchCallback callback) {
        this.callback = callback;
    }

    public void research(ResearchData data) {
        // quite a bit of logic goes here that builds the list of data...
        callback.discoveredResearch(data, mapOfDiscoveredStuff);
    }
}