public List<String> getMessages() {
CLIENT_LOGGER.info("start receiving messages");
checkConnected();
List<String> list = new ArrayList<>();
HttpURLConnection incomeConnection = null;
try {
CLIENT_LOGGER.info("send request for receive messages");
String query =
String.format(
"%s?%s=%s",
Constants.CONTEXT_PATH,
Constants.REQUEST_PARAM_TOKEN,
MessageHelper.buildToken(localHistory.size()));
URL url = new URL(Constants.PROTOCOL, host, port, query);
incomeConnection = prepareInputConnection(url);
CLIENT_LOGGER.info("response is received");
String response = MessageHelper.inputStreamToString(incomeConnection.getInputStream());
JSONObject jsonObject = MessageHelper.stringToJsonObject(response);
JSONArray jsonArray = (JSONArray) jsonObject.get("messages");
CLIENT_LOGGER.info("received " + jsonArray.size() + " messages");
for (Object o : jsonArray) {
logger.info(String.format("Message from server: %s", o));
CLIENT_LOGGER.info("message from server: " + o);
list.add(o.toString());
}
/** Here is an example how for cycle can be replaced with Java 8 Stream API */
// jsonArray.forEach(System.out::println);
// list = (List<String>)
// jsonArray.stream().map(Object::toString).collect(Collectors.toList());
} catch (ParseException e) {
logger.error("Could not parse message", e);
CLIENT_LOGGER.error("could not parse message", e);
} catch (ConnectException e) {
logger.error("Connection error. Disconnecting...", e);
CLIENT_LOGGER.error("connection error", e);
disconnect();
} catch (IOException e) {
logger.error("IOException occured while reading input message", e);
CLIENT_LOGGER.error("IOException occured while reading input message", e);
} finally {
if (incomeConnection != null) {
incomeConnection.disconnect();
}
}
CLIENT_LOGGER.info("stop receiving messages");
return list;
}
