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Figure 23-1. Sequence diagram for credit/debit There are a number of problems with this sequence of actions that can benefit from the use of a transaction model. The steps of credit() and creditDebit() should certainly be performed either together or not at all. But in addition there is the issue of the quality of the service. For example, suppose the client is not happy with the results from the service, and it would like to reclaim its money or, better yet, not spend it in the first place. If we include the delivery of the service in the transaction, then there is the opportunity for the client to abort the transaction before it is committed. Figure 23-2 shows the larger set of messages in the sequence diagram for normal execution. As before, the client requests the cost from the service. After getting this cost, the client asks the transaction manager to create a transaction and receives the transaction ID. It then joins the transaction itself. When it asks the service to credit an amount, the service also joins the transaction. The service then asks the account to creditDebit() the amount, and as part of this the account also joins the transaction. The client then requests the service and gets the result. If all is fine, it then asks the transaction manager to commit(), which triggers the prepare and commit phase. The transaction manager asks each participant to prepare(), and if it gets satisfactory replies from each, it then asks each one to commit().

The Light Sensor can now be configured to detect objects by having the light either reflect off or be obstructed by the object. The LEGO Light Sensor s LED is permanently arranged so you can only reflect light directly back from an object. This version can reflect the light at an angle (as shown in Figure 10-7) if you want.

2. Create a new Silverlight application called SimpleBehavior, as I do in Figure 7-22.

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Figure 23-2. Sequence diagram for credit/debit with transactions The points of failure in this transaction include the following: The cost may be too high for the client. However, at this stage, the client has not created or joined a transaction, so it s not an issue. The client may offer too little in the way of payment to the service. The service can signal this by joining the transaction and then aborting it, which ensures that the client has to roll back the transaction. (Of course, the service could instead throw a NotEnoughPayment exception; joining and aborting is used for illustrating transaction possibilities.) There may be a time delay between finding the price and asking for the service, and the price may have gone up in the meantime. The service would then abort the transaction, forcing the client and the accounts to roll back.

3. In the Projects panel right-click the Solution and left-click Edit in Visual Studio, as I am doing

Figure 10-7. Reflected light application When an object moves in front of the sensor, the light from the LED is reflected back at the LDR, and the measured light level increases. The problem with depending only on light level is that the ambient light can also increase, creating a false detection. The way around this problem is to take a light reading without the LED turned on to establish the ambient level and then a second reading with the LED on. The two readings will be equally affected by the ambient light, but only the one with the LED turned on will be affected by light reflected off the object. It is a simple matter of subtracting the two readings to get a number that is sensitive only to the presence of an object. The NXT-G program in Figure 10-8 continuously displays the value of the difference of the two readings. The Display Value My Block was developed back in 2 and simply puts the current value on the NXT display.

in Figure 7-23.

After the service is performed, the client may decide that the result was not good enough and refuse to pay. Aborting the transaction at this stage would cause the service and accounts to roll back. The accounts service may abort the transaction if sufficient client funds are unavailable.

Figure 7-23. Edit the project in Visual Studio 2010. Visual Studio 2010 will open. Here is where we are going to add our Behavior. We are going to create a Behavior that will make an object change color when the mouse is down and then return to its original color when the mouse is up. Let s do that now:

The service is a version of the familiar file classifier that requires a payment before it will divulge the MIME type for a file name. A bit unrealistic, perhaps, but that doesn t matter for our purposes here. There will be an interface, PayableFileClassifier, which extends the FileClassifier interface. We will also make it extend the Payable interface, just in case we want to charge for other services. In line with other interfaces, we ll extend the PayableFileClassifier to a RemotePayableFileClassifier and then implement it with a PayableFileClassifierImpl. The PayableFileClassifierImpl can use the implementation of the rmi.FileClassifier Impl, so we will make it extend this class. We also want it to be a participant in a transaction, so it must implement the TransactionParticipant interface. This leads to the inheritance diagram of Figure 23-3, which isn t as complex as it looks.

1. The first thing to do is add a new class to our project that will be our Behavior class. To do that

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