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If you store the Cart ID in the visitor s cookie, you ll have access to it when the visitor returns after a period of time. If the shopping cart cookie doesn t exist, it can mean that the visitor used your shopping cart for the first time, so you generate a new GUID and save it to the cookie. If the cookie exists, you take the GUID from there and use the shopping cart associated with it. What about customers that have disabled (or whose browsers don t support) cookies Well, the backup strategy is to also use the visitor s session. ASP.NET s session relies, by default, on using cookies, but by changing a simple setting, you can enable cookieless session support. An alternative option to support cookieless browsers is to append the session ID to the query string, as many popular e-commerce web sites do. Both solutions have the same effect and allow the customers to use your shopping cart even if their browsers don t support cookies (however, in this case, their shopping carts are lost if they close their browser session and return after a while, unlike when using cookies).

The problem with onSaveInstanceState() is that you are limited to a Bundle. That s because this callback is also used in cases where your whole process might be terminated (e.g., low memory), so the data to be saved must be something that can be serialized and does not have any dependencies on your running process. For some activities, that limitation is not a problem. For others, it is more annoying. Take an online chat, for example. You have no means of storing a socket in a Bundle, so by default, you will need to drop your connection to the chat server and reestablish it. That not only may be a performance hit, but it might also affect the chat itself, such as appearing in the chat logs as disconnecting and reconnecting. One way to get past this is to use onRetainNonConfigurationInstance() instead of onSaveInstanceState() for light changes like a rotation. Your activity s onRetainNonConfigurationInstance() callback can return an Object, which you can retrieve later via getLastNonConfigurationInstance(). The Object can be just about anything you want. Typically, it will be some kind of context object holding activity state, such as running threads, open sockets, and the like. Your activity s onCreate() can call getLastNonConfigurationInstance(). Then if you get a non-null response, you now have your sockets and threads and whatnot. The biggest limitation is that you do

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#include <Twitter.h> #include <OneWire.h> #include <DallasTemperature.h> The Twitter library needs the three Ethernet libraries to work so they are all included. Next, the defines for the sensors are set: #define ONE_WIRE_BUS 3 #define TEMPERATURE_PRECISION 12 You create four floats for the temperatures, this time for internal and external temperatures in both C and F: float itempC, itempF, etempC, etempF; The first time the program attempts to make a tweet, you want it to keep on trying until it successfully connects and sends the message. Therefore, a Boolean is created and set to true, so you know if you have yet to make your first tweet or not: boolean firstTweet = true; As before, you create instances for the one-wire and temperature sensors as well as the addresses for the two sensors: OneWire oneWire(ONE_WIRE_BUS); DallasTemperature sensors(&oneWire); DeviceAddress insideThermometer = { 0x10, 0x7A, 0x3B, 0xA9, 0x01, 0x08, 0x00, 0xBF }; DeviceAddress outsideThermometer = { 0x10, 0xCD, 0x39, 0xA9, 0x01, 0x08, 0x00, 0xBE}; You give the Ethernet shield a MAC address: byte mac[] = { 0x64, 0xB9, 0xE8, 0xC3, 0xC7, 0xE2 }; Next, you create an instance of the Twitter library and pass it the token for your account: Twitter twitter("608048201-CxY1yQi8ezhvjz60ZVfPHVdzIHbMOD1h2gvoaAIx"); The interval in-between tweets is set unsigned long interval = 600000; // 10 minutes as is a variable to store the time you last tweeted. unsigned long lastTime; // time since last tweet Two character arrays are created. These will store the message to be tweeted and the message you will output to the serial monitor window. char message[140], serialString[60];

Session handling is a great ASP.NET feature that allows you to keep track of variables specific to a certain visitor accessing the web site. While your visitor browses various pages of the web site, its session variables are persisted by the web server, and the Web Application can keep track of certain visitor data by uniquely identifying the visitor (you can track, for example, data such as the visitor ID or the visitor s favorite background color, name, email address, and so on). The visitor s session object stores pairs of values (variable name, variable value) that are accessible for the entire visitor s visit on your web site. In ASP.NET, you can access the session data through the Session object. You can use this object to preserve data between client requests. This data is stored on the server side and is not passed back and forth during requests only a session identifier is passed. This means that storing large quantities of data in the visitor s session occupies the server s memory, but doesn t increase network traffic. In this chapter, you ll only use the session to store the ID of your visitor s shopping cart.

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