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1. What was the point of the Tupperware story a. Befuddled salesmen are the best. b. Customers like to participate in the selling process. c. Tupperware is no longer successful with parties. d. You should run parties to sell products. e. None of the above. 2. Why provide customer service over the Web a. It saves millions of dollars. b. Customers never get put on hold. c. You can provide data and pictures that are unavailable in any other way. d. You can build loyalty. e. All of the above. 3. Which of the following is not one of the rules for successful customer service a. Provide good information. b. Empower the CSR agents. c. Set up test and control groups.

counter = counter + 1;

TreeMap class has been retrofitted to extend from NavigableMap instead of SortedMap. In addition, a concurrent version of the interface is available with the ConcurrentSkipListMap

This statement breaks down into the following steps. 1. 2. 3. Read the current value of the counter variable. Calculate the sum of the value and 1. Assign the result of the value back to the counter variable.

You see the range of results from Listing 24-24 because there are slight variations in the timing of the ten Tasks, as shown in Figure 24-4.

Year 1 Retention rate Customers Visits per year Spending per visit Revenue Cost percentage Costs Acquisition cost ($32) Total costs Pro t Discount rate NPV of pro t Cumulative NPV of pro t Lifetime value 40% 200,000 1.4 $50 $14,000,000 50% $ 7,000,000 $ 6,400,000 $13,400,000 $600,000 1 $600,000 $600,000 $3.00 Year 2 45% 80,000 1.6 $60 $7,680,000 49% $3,763,200 $3,763,200 $3,916,800 1.12 $3,497,143 $4,097,143 $20.49 Year 3 50% 36,000 1.8 $70 $4,536,000 48% $2,177,280 $2,177,280 $2,358,720 1.32 $1,786,909 $5,884,052 $29.42

Figure 24-4. The problem with shared data Figure 24-4 shows what can happen when two Tasks from Listing 24-24 are slightly out of phase with one another. Both Tasks read the current value of the variable and get the initial value of zero. Both Tasks add one to the value to produce a result of 1. Both Tasks store the result in the variable. The result produced by the second Task overwrites the result produced by the first Task and you end up missing an increment. This is how you end up with a range of results from Listing 24-24. This kind of issue is called a race condition, also known as a data race or a race hazard. Race conditions are a major cause of problems in parallel programming. Every time you share data between two or more Tasks, you must ask yourself if there is a chance that a race condition will arise. If there is such a chance, there are a range of different techniques you can employ to prevent unexpected results. These techniques are collectively called synchronization. The next section shows you how to use one of the most basic types of synchronization, known as a critical region. See my book on C# parallel programming for details of more advanced techniques.

A critical region is a group of statements that only one Task at a time can execute. If Tasks were people, a critical region would be a room with a guard outside. When a Task tries to enter the room, the guard checks to see if anyone is already inside. If the room is empty, the Task is allowed in. If there is another Task already in the room, the guard makes the Task wait outside until the room is empty again. At any time, there can be zero or one Tasks in the room. To stop race conditions, you put the statements that access shared data inside of a critical region. This means that only one Task will be able to access the shared data at a time, as illustrated by Figure 245.

Figure 24-5. Applying a critical region to prevent a race condition To prevent a race condition in Listing 24-24, you would need to ensure that the three steps taken to read, increment, and store the counter variable were contained within a critical region. Were you to do this, then only one Task would be able to access the shared variable at any given moment, as the figure shows.

class. For those unfamiliar with skip lists, they are a form of ordered linked lists that maintain parallel linked lists for speeding up search time. While the TreeMap structure is balanced and searches from roughly the middle of the list to find a key, the ConcurrentSkipListMap always starts at the beginning but thanks to the secondary skip lists, it keeps its search time close to that of a binary search. There is nothing fancy about using the NavigableMap interface. Listing 2-8 demonstrates its usage with a map of the days of the week. Output follows the source.