java - 计算以毫秒为单位的差异需要时间

Question

我不知道如何正确标题我的问题，因为我不确定这里出了什么问题，所以我将发布我的代码并解释我想要实现的目标..

我有一个每秒运行并发送事件的服务。例如，我需要在该过程中进行一些检查，每次检查都会在一定时间段后运行。每秒我都会获取设备属性值，每个检查2 秒我获取“currentBox”，每 5 秒我检查一次网络连接，每小时我尝试登录..

这是代码:

private void startAutoUpdate() {
    long current = System.currentTimeMillis();
    if (!connectivityHelper.isConnectedMobile() && !connectivityHelper.isConnectedEthernet() && !connectivityHelper.isConnectedWifi()) {
        eventBus.post(new Event(new ObjectConnectivity(connectivityHelper.isOnline(), null), Event.EVENT_TYPE_CONNECTIVITY_EVENT));
    }

    boolean localReset = false; // maybe  force was set after this started!!
    if (clearETags)
        localReset = true;

    try {
        try {
            if (localReset) {
                attributeValueRepository.clearETag();
                attributeValueRepository.clear();
                attributeValueRepository.fetchMeteoAttr();
            } else if (canUpdate(getResources().getInteger(R.integer.weather_update_delay)))
                attributeValueRepository.fetchMeteoAttr();
        } catch (Exception e) {
            Log.d(TAG, "fail to load meteo attributes");
        }

        attributeValueRepository.fetchAll();
        Log.d("AVTEST", "Fetch all");
        try {
            if (localReset) {
                deviceStateRepository.clearETag();
                deviceStateRepository.clear();
                deviceStateRepository.fetchAll();
            } else if (canUpdate(getResources().getInteger(R.integer.state_update_delay)))
                deviceStateRepository.fetchAll();
        } catch (Exception e) {
            Log.d(TAG, "fail to load deviceStateRepository");
        }

        try {

            if ((current - lastBoxCall) > 2000) {
                currentBox = restTemplate.getRemoteOnlyCopy().getForObject("v2/box", Box.class);
                if (currentBox != null) {
                    newSyncDate = df.format(currentBox.getSyncDate());
                    if (syncDate == null) {
                        syncDate = df.format(currentBox.getSyncDate());
                    } else {
                        if (!newSyncDate.equals(syncDate)) {
                            eventBus.post(new Event(null, Event.EVENT_TYPE_REFRESH_REQUEST));
                            syncDate = newSyncDate;
                        }
                    }
                }
                lastBoxCall = current;
                Log.d("AVTEST", "Fetch current box");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        try {
            if ((current - lastNetworkCall) > 5000) {
                if (connectivityHelper.isConnectedEthernet() || connectivityHelper.isConnectedWifi()) {
                    try {
                        int timeoutMs = 1500;
                        Socket sock = new Socket();
                        SocketAddress sockaddr = new InetSocketAddress("8.8.8.8", 53);
                        sock.connect(sockaddr, timeoutMs);
                        sock.close();
                        isOnline = true;
                        showNotification(true);
                    } catch (IOException e) {
                        isOnline = false;
                        showNotification(false);
                    }
                    connectivityHelper.setIsOnline(isOnline);
                    eventBus.post(new Event(isOnline, Event.EVENT_CONNECTION));
                } else {
                    connectivityHelper.setIsOnline(false);
                    showNotification(false);
                }
                lastNetworkCall = current;
                Log.d("AVTEST", "Check network connection");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        try {
            if ((current - lastLoginCall) > 3600000) {
                restTemplate.login(restTemplate.getUsername(), restTemplate.getPassword(), restTemplate.getSerial());
            }
            lastLoginCall = current;
            Log.d("AVTEST", "Relogin");
        } catch (Exception e) {
            Log.e(TAG, e.getMessage() != null ? e.getMessage() : "relogin error");
        }

        if (localReset) {
            clearETags = false;
        }

        errorCount = 0;
        previousCall = System.currentTimeMillis();

        eventBus.post(new Event(null, Event.EVENT_TYPE_AUTO_UPDATER_SERVICE));
        eventBus.post(new Event(new ObjectConnectivity(connectivityHelper.isOnline(), null), Event.EVENT_TYPE_CONNECTIVITY_EVENT));

    } catch (Exception e) {
        Log.d(TAG, "", e);
    }
}

所以重点是，我屏幕上的小部件应该在每个事件后(每秒)更新，但由于某种原因它们有时会延迟，所以我对其进行了调试。我发现此部分导致了延迟:

  try {
            if ((current - lastLoginCall) > 3600000) {
                restTemplate.login(restTemplate.getUsername(), restTemplate.getPassword(), restTemplate.getSerial());
            }
            lastLoginCall = current;
            Log.d("AVTEST", "Relogin");
        } catch (Exception e) {
            Log.e(TAG, e.getMessage() != null ? e.getMessage() : "relogin error");
        }

我在 Android Monitor 中查找，这是流程:

D/AVTEST: Fetch all
D/AVTEST: Fetch current box
D/AVTEST: Check network connection
D/AVTEST: Relogin
D/AVTEST: Home screen types update
D/AVTEST: Push logic: key: 2130968946, value: ViewHolder{3cec115 position=0 id=-1, oldPos=-1, pLpos:-1}

最后两个不是来自这个服务，但现在没关系，问题是，日志在“重新登录”之前停止大约15秒，然后继续..是计算这个东西太重还是什么？

((current - lastLoginCall) > 3600000)

Answer 1

您说日志在重新登录之前停止 15 秒左右。我最好的猜测是它是由restTemplate.login 调用引起的 - 请记住您的“重新登录”日志是在restTemplate 调用之后。这是有道理的，因为它取决于网络连接以及服务器对登录请求的响应速度。

(当前 - 最后登录)始终可以忽略不计。