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An integrity key is used to compute message authentication codes (MACs). If both Alice and Bob share an integrity key, then they can use that key to compute MACs on messages they exchange to help them detect if an attacker may have tampered with the messages.

Let s look at each part of this diagram. You ve already seen how to use a connection to execute SQL statements and retrieve results, and you ve seen how to create an engine object to represent the particular database you want to connect to within the underlying RDBMS. You also know that SQLAlchemy uses the underlying DB-API 2.0 driver behind the scenes to communicate with the RDBMS, so let s look at dialects and pools. Instances of Dialect objects tell SQLAlchemy how to deal with the subtleties of the different implementations of the DB-API 2.0 drivers to make some of SQLAlchemy s internal code a little simpler, but you wouldn t usually interact with them directly. Pools, on the other hand, are more interesting. Aside from SQLite, most RDBMSs run as servers that the client connects to over a network. Each request that comes to the server and that needs to interact with a database will need its own database connection. Creating a connection can often be quite a costly exercise, and if you have a lot of requests, you will need to open and close lots of connections, which could impact the performance of your application. One solution to this problem is to have SQLAlchemy manage a pool of connections for you. When Pylons loads, SQLAlchemy can make a number of DB-API 2.0 connections to the underlying RDBMS and keep them open. When your application calls engine.connect() to obtain a connection, SQLAlchemy can return one of the connections from the pool rather than creating a new one. When you close the SQLAlchemy

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QGraphicsView view; view.setScene( &scene ); view.show(); return app.exec();

connection, it can return the DB-API connection to the pool ready to be used again the next time you call engineconnect() This enables you to write your Pylons application in the same way you would if you were creating and closing lots of connections but have SQLAlchemy reuse connections from its internal pool You can configure pool options as arguments to the create_engine() function: pool_size: The number of connections to keep open inside the connection pool pool_recycle: The length of time to keep connections open before recycling them If not specified, the connections will stay open forever This should be specified for MySQL in particular because servers typically close connections after eight hours, resulting in a MySQL server has gone away error pool_timeout: The number of seconds to wait before giving up on getting a connection from the pool.

It is good security practice to only use a key for one purpose. For example, a single key should not be used as both a session key and an integrity key. If an adversary figures out a session key, she will be able to decrypt and eavesdrop, but not necessarily tamper with the messages. On the other hand, if the same key is used both as a session key and an integrity key, the adversary will be able to read and modify bits in the encrypted conversation. Of course, the hope is that the vulnerability that allowed the attacker to figure out the session key cannot also be used to determine the integrity key! Nevertheless, using one key for only one purpose is the right, paranoid thing to do, and can provide additional protection.

} Now that you know how the handles look and how the class is used in a scene, it s time to have a look at the actual class Listing 7-23 shows the class declaration The listing starts with a forward declaration of the class because the class will contain pointers to instances of itself Then it defines an enumeration of the different available roles: CenterHandle, RightHandle, and TopHandle The constructor that follows the enum contains all the expected arguments, as discussed earlier However, the role and list of handles have default values The default role is a center handle, and the list is empty by default The next two methods are required when inheriting from QGraphicsItem The paint method is responsible for painting the shape upon request, while boundingRect tells the scene how large the shape is The class declaration then continues with a set of protected methods.

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