public String call()

in httpdns_api_demo/src/main/java/alibaba/httpdns_api_demo/HttpDNS.java [164:214]
49 lines of code
10 McCabe index (conditional complexity)

        public String call() {
            String resolveUrl = "http://" + SERVER_IP + "/" + ACCOUNT_ID + "/d?host=" + hostName;
            HttpDNSLog.logD("[QueryHostTask.call] - buildUrl: " + resolveUrl);
            try {
                HttpURLConnection conn = (HttpURLConnection) new URL(resolveUrl).openConnection();
                conn.setConnectTimeout(RESOLVE_TIMEOUT_IN_SEC * 1000);
                conn.setReadTimeout(RESOLVE_TIMEOUT_IN_SEC * 1000);
                if (conn.getResponseCode() != 200) {
                    HttpDNSLog.logW("[QueryHostTask.call] - response code: " + conn.getResponseCode());
                } else {
                    InputStream in = conn.getInputStream();
                    BufferedReader streamReader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
                    StringBuilder sb = new StringBuilder();
                    String line;
                    while ((line = streamReader.readLine()) != null) {
                        sb.append(line);
                    }
                    JSONObject json = new JSONObject(sb.toString());
                    String host = json.getString("host");
                    long ttl = json.getLong("ttl");
                    JSONArray ips = json.getJSONArray("ips");
                    if (host != null) {
                        if (ttl == 0) {
                            // 如果有结果返回，但是ip列表为空，ttl也为空，那默认没有ip就是解析结果，并设置ttl为一个较长的时间
                            // 避免一直请求同一个ip冲击sever
                            ttl = EMPTY_RESULT_HOST_TTL;
                        }
                        HostObject hostObject = new HostObject();
                        String ip = (ips == null) ? null : ips.getString(0);
                        HttpDNSLog.logD("[QueryHostTask.call] - resolve host:" + host + " ip:" + ip + " ttl:" + ttl);
                        hostObject.setHostName(host);
                        hostObject.setTtl(ttl);
                        hostObject.setIp(ip);
                        hostObject.setQueryTime(System.currentTimeMillis() / 1000);
                        if (hostManager.size() < MAX_HOLD_HOST_NUM) {
                            hostManager.put(hostName, hostObject);
                        }
                        return ip;
                    }
                }
            } catch (Exception e) {
                if (HttpDNSLog.isLogEnabled()) {
                    e.printStackTrace();
                }
            }
            if (!isRequestRetried) {
                isRequestRetried = true;
                return call();
            }
            return null;
        }