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We added a ServiceBehavior attribute to the code to specify this single-instance behavior. Notice that we also asked for a ConcurrencyMode of Reentrant. This tells WCF to have our service work on requests for only one session at a time if requests from multiple clients come in simultaneously, WCF will service them one after another. This is convenient as it means that as long as any single client does only one thing at a time, we don t need to write any code to ensure the thread safety of our state handling.

You ve already seen an example of Extract and Override in section 3.4.5. We derive from the class under test so that we can override a virtual method and force it to return our stub. But why stop there What if you re unable or unwilling to add a new interface every time you need control over some behavior in your code

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How long do Hibernate sessions last, and are they available to the view for lazy instantiation In this chapter we opted for a very short duration so the actions didn t need to worry about managing Hibernate sessions. In our experience, leaving a session open for a long period of time is a recipe for trouble. Other developers on the project (beside you) need to understand too much about how long sessions are open to be productive. It s better to have the controller completely initialize all the objects for the view. How do controllers get a handle on the SessionFactory In this chapter the EventDao uses a static field to store the SessionFactory, but you can also store it in the ServletContext. How much logic goes into the controller It s our general preference to have very thin actions, so we opted to move all the Hibernate query logic into the DAO, leaving only coordination and presentation logic for the controller. How reusable are controllers This goes hand in hand with point 3. Generally, we don t favor reusing controllers, especially in a framework like WebWork or Struts. Action chaining (reusing logic by having an Action call another Action) is essentially programming in XML (your config file), which we find cumbersome and hard to

This expression uses the && operator to combine two smaller expressions. Notice that the two smaller expressions were each surrounded by parentheses to avoid any ambiguity. If we left out the parentheses, like so:

Drop a Button control into the Albums group box, a Listbox control into the Photographs group box, and a Button control at the base of the form.

Given a SQL statement, retrieve its results from the database, and put it all in a DataTable object. A SqlDataAdapter connects the SqlDataReader with the DataTable.

The simplest tool for measuring time that we have at our disposal is the system clock, which JavaScript exposes to us through the Date object. If we instantiate a Date object with no arguments, then it tells us the current time. If one Date is subtracted from another, it will give us the difference in milliseconds. Listing 8.1 summarizes our use of the Date object to time events.

-- Breaks down buffers by object (table, index) in the buffer cache SELECT OBJECT_NAME(p.object_id) AS 'ObjectName', p.object_id, p.index_id, COUNT(*)/128 AS 'buffer size(MB)', COUNT(*) AS 'buffer_count' FROM sys.allocation_units AS a INNER JOIN sys.dm_os_buffer_descriptors AS b ON a.allocation_unit_id = b.allocation_unit_id INNER JOIN sys.partitions AS p ON a.container_id = p.hobt_id WHERE b.database_id = db_id() GROUP BY p.object_id, p.index_id ORDER BY buffer_count DESC

To see how to interact with a database, you ll begin by creating a web application that can be used to display information about the AdventureWorks database. You ll start out by simply retrieving and displaying a subset of data. These exercises will teach you how to connect your controls to a database to retrieve, filter, and sort the data and then use the myriad options for presenting it attractively. As you may remember, AdventureWorks is a free database from Microsoft that represents a fictional company that sells outdoor and extreme sports gear. The database tracks products, inventory, customers, transactions, and suppliers.

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