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private static final String SAMPLE_DETAIL_RESP = "sampleDetailsResponse";
private static final String DETAILS = "details";
...
private static final String COMMENT = "comment";
private static final String RESULT = "result";


...
 
@Override
public void process(long sid, ObjectNode payload) {
    String id = string(payload, ID, "(none)");

    // SomeService ss = get(SomeService.class);
    // Item item = ss.getItemDetails(id)

    // fake data for demonstration purposes...
    Item item = getItem(id);

    ObjectNode rootNode = MAPPER.createObjectNode();
    ObjectNode data = MAPPER.createObjectNode();
    rootNode.set(DETAILS, data);

    if (item == null) {
        rootNode.put(RESULT, "Item with id '" + id + "' not found");
        log.warn("attempted to get item detail for id '{}'", id);

    } else {
        rootNode.put(RESULT, "Found item with id '" + id + "'");

        data.put(ID, item.id());
        data.put(LABEL, item.label());
        data.put(CODE, item.code());
        data.put(COMMENT, "Some arbitrary comment");
    }

    sendMessage(SAMPLE_DETAIL_RESP, 0, rootNode);
}