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Finally, create the SaveData method. This method will test to see if the web server is available, save the data to the server, and then retrieve all the customers again. This way, any changes made in the back office will be reflected. Listing 10-15 shows the added method. Listing 10-15. Adding the SaveData Method namespace ACME.POS.Service.Client { public class OfflineManager { private string m_Url; private bool TestWebServer(string Url, int Timeout)... private string GetUrl... public List<Customer> ReadData()... private List<Customer> ReadDataFromServer(string url)... public void SaveData(Customer[] customers) { string url = GetUrl; //check to see if server is available if (TestWebServer(url, 10)) { CustomerServices service = new CustomerServices(); service.Url = url; //save data for(int i = 0; i < customers.Length; i++) { if (customers[i].IsModified) { customers[i] = service.SaveCustomer(customers[i]); } } } else { CacheManager cache = CacheFactory.GetCacheManager(); cache.Add("customers", customers); } } } }

String softkeys = myProperties.getString(platform); if(softkeys != null) { int index = softkeys.indexOf(","); myLeftSoftkey = Integer.parseInt(softkeys.substring(0, index).trim()); myRightSoftkey = Integer.parseInt(softkeys.substring(index + 1).trim()); myUseSoftkeys = true; } } catch(Exception e) { // if there's any problem with reading the softkey info, // just don't use softkeys } } //--------------------------------------------------------// data methods /** * Return whether to use softkeys instead of commands. */ public boolean useSoftkeys() { return myUseSoftkeys; } /** * Return a data value of type int. */ public int getInt(String key) { return myProperties.getInt(key); } /** * Return a label. */ public String getLabel(String key) { return myLabels.getString(key); } /** * Return an image. */ public Image getImage(String key) throws IOException { return myProperties.getImage(key); }

You can solve it as shown, or manually change the sleep timer settings using the NXT on-brick menu..

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In the OfflineManager class, the SaveData and ReadDataFromServer methods both referred to a named cache instance called customers. In order to support that cache, we need to create a named cache instance called customers in the application configuration file, and we want the cache to be encrypted. Creating this encrypted cache instance involves two steps: configuring the Cryptography Application Block and configuring the Caching Application Block.

CHAPTER 8 JOHNNXT IS ALIVE!

/** * Return a label image */ public Image getLabelImage(String key) throws IOException { return myLabelImagesgetSubimage(key); } //--------------------------------------------------------// utilities /** * Check if the given keycode corresponds to a softkey * for this platform, and if so, which one */ public int whichSoftkey(int keycode) { if(myUseSoftkeys) { if(keycode == myLeftSoftkey) { return SOFT_LEFT; } if(keycode == myRightSoftkey) { return SOFT_RIGHT; } } return SOFT_NONE; } } You can see that this simple class checks the screen size and the microeditionlocale system property and then loads the corresponding properties files The value returned by the microeditionlocale property gives a string that consists of a language code (given by two lowercase letters) optionally followed by a hyphen and then a country code (given by two uppercase letters) Some examples would be en-US for US.

The steps for configuring the Cryptography Application Block are similar to those outlined in the earlier examples in this chapter. The four steps are as follows: 1. Open the application configuration file of the ACME.POS.Service.Client project in the Configuration Console. 2. Add the Cryptography Application Block. 3. Add a new TripleDES provider to the Symmetric Providers node. 4. Go through the Cryptographic Key Wizard and name the key file customer.key.

With the symmetric encryption provider configured, it is time to configure the customers cache. Follow these steps: 1. Add a new cache manager instance to the Cache Managers node of the Caching Application Block and name it customers. 2. Add an isolated cache store by right-clicking the customers node and selecting New Isolated Storage. 3. Click the Isolated Storage node and set the PartitionName property value to customerData. 4. Right-click the Isolated Storage node and select New Symmetric Storage Encryption. 5. Click the Symmetric Storage Encryption node and set the SymmetricInstance property value to the TripleDESCryptoServiceProvider that you created earlier. That will allow the cached data to be stored locally on the user s machine in an encrypted format. Figure 10-13 shows the encrypted cache configuration in the Configuration Console.

This is the overall structure of the slave program. It isn t complicated. The subroutines to move the auxiliary motors are not reported here, but you can read those in the source code of JohnNXT; they are simple to understand once you ve learned the theory behind them. The FSMs are explained in 3 and the practical example is in 4 (Listings 4-6 and 4-7, Tables 4-1 and 4-2).

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