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Running the site now gives Figure 10-2 for the Home page.
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One of the overloaded constructors for Regex takes a regular expression string as its parameter.
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List results = session.createFilter( user.getBids(), "where this.created > :oneWeekAgo" ) .setTimestamp("oneWeekAgo", oneWeekAgo) .list();
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[[object alloc] initWithCoder:decoder]; [object objecttypeWithArgument:argument];
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public void UpdatePosition(double minutesToAdvance) { double hours = minutesToAdvance / 60; double milesMoved = this.SpeedInMilesPerHour * hours; double milesToTower = this.Position.Distance; if (this.Direction == DirectionOfApproach.Approaching) { milesToTower -= milesMoved; if (milesToTower < 0) { // We've arrived! milesToTower = 0; } } else { milesToTower += milesMoved; } PolarPoint3D newPosition = new PolarPoint3D( milesToTower, this.Position.Angle, this.Position.Altitude); }
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' ----- Line from (10, 10) to (40, 40). e.Graphics.DrawLine(Pens.Black, 10, 10, 40, 40) ' ----- 90degree clockwise arc for 40-pixel diameter circle. e.Graphics.DrawArc(Pens.Black, 50, 10, 40, 40, 0, -90) ' ----- Filled 40x40 rectangle with a dashed line. e.Graphics.FillRectangle(Brushes.Honeydew, 120, 10, 40, 40) Using dashedPen As New Pen(Color.Black, 2) dashedPen.DashStyle = Drawing2D.DashStyle.Dash e.Graphics.DrawRectangle(dashedPen, 120, 10, 40, 40) End Using
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So far, we ve demonstrated that JavaScript functions are powerful objects, but you can do much more. For example, you can use functions to create custom objects, as you ll see in the next section.
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> ajc *.java > java Test Mar 30, 2003 12:16:15 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering Mar 30, 2003 12:16:16 INFO: Entering
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in Dashcode. For example, the Fill & Stroke inspector is shown in figure 7.2. Here you can manipulate objects more precisely than you can inside the canvas. The inspector window includes five different tabs that can be used to modify a wide variety of settings. Here they are, from left to right:
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- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *MyIdentifier = @"MyIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
From our experience with the Hibernate user community, we know that the first thing many developers try to do when they begin using Hibernate is a mapping of a parent/children relationship. This is usually the first time you encounter collections. It s also the first time you have to think about the differences between entities and value types, or get lost in the complexity of ORM. Managing the associations between classes and the relationships between tables is at the heart of ORM. Most of the difficult problems involved in implementing an ORM solution relate to association management. You mapped relationships between classes of value type in the previous section and earlier in the book, with varying multiplicity of the relationship ends. You map a one multiplicity with a simple <property> or as a <component>. The many association multiplicity requires a collection of value types, with <element> or <composite-element> mappings. Now you want to map one- and many-valued relationships between entity classes. Clearly, entity aspects such as shared references and independent lifecycle complicate this relationship mapping. We ll approach these issues step by step; and, in case you aren t familiar with the term multiplicity, we ll also discuss that. The relationship we show in the following sections is always the same, between the Item and Bid entity classes, as can be seen in figure 6.8. Memorize this class diagram. But first, there s something we need to explain up front. If you ve used EJB CMP 2.0, you re familiar with the concept of a managed association (or managed relationship). CMP associations are called container managed relationships (CMRs) for a reason. Associations in CMP are inherently bidirectional. A change made to one side of an association is instantly reflected at the other side. For example, if you call aBid.setItem(anItem), the container automatically calls anItem.getBids().add(aBid).
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The mapping document tells Hibernate that the Message class is to be persisted to the MESSAGES table, that the identifier property maps to a column named MESSAGE_ID, that the text property maps to a column named MESSAGE_TEXT, and that the property named nextMessage is an association with many-to-one multiplicity that maps to a foreign key column named NEXT_MESSAGE_ID. Hibernate also generates the database schema for you and adds a foreign key constraint with the name FK_NEXT_MESSAGE to the database catalog. (Don t worry about the other details for now.) The XML document isn t difficult to understand. You can easily write and maintain it by hand. Later, we discuss a way of using annotations directly in the source code to define mapping information; but whichever method you choose,
In theory, you can use pointers anywhere in C#, but in practice, they are almost never required outside of interop scenarios, and their use is nearly always discouraged. When you do use pointers, you must mark your code with the C# unsafe modifier. The code is marked as unsafe because pointers let you manipulate memory locations directly, defeating the usual type safety rules. In unsafe code, you can directly access memory, perform conversions between pointers and integral types, take the address of variables, perform pointer arithmetic, and so forth. In exchange, you give up garbage collection and protection against uninitialized variables, dangling pointers, and accessing memory beyond the bounds of an array. In essence, the unsafe keyword creates an island of code within your otherwise safe C# application that is subject to all the pointer-related bugs C++ programs tend to suffer from. Moreover, your code will not work in partialtrust scenarios.
This chapter has covered a lot of ground in terms of introducing some of the EJB APIs and grammars. In some cases, we ve glossed over the more intimate details underpinning the creation, packaging, deployment, and testing of a stateless session bean to instead clearly focus upon the conceptual aspects involved. The next chapter contains an in-depth discussion of session beans and associated services.
Suppose we want to write some code that tests our MostRecentlyUsed class in multithreaded scenarios. Even relatively simple tests pose a challenge: for example, what if we want to verify that after a call to UseItem has returned on one thread, the item it passed in becomes visible as the first item returned if some different thread calls GetItems We re not testing concurrent use we re just testing sequential operations, where one thing happens on one thread and then something else happens on another. How would we write a test that coordinated these steps across threads We need one thread to wait until the other has done something. We could just use the Thread class s Join method again, waiting for the first thread to exit. But what if we don t want to let it exit We might want to perform a sequence of operations, with each thread taking it in turns. Monitors can help with this as well as protecting shared state, they also provide a way to discover when that state may have changed. The Monitor class provides a Wait method that operates in conjunction with either a method called Pulse or the related PulseAll. A thread that is waiting for something to change can call Wait, which will block until some other thread calls Pulse or PulseAll. You must already hold the lock on the object you pass as an argument to Wait, Pulse, or PulseAll. Calling them without possessing the lock will result in an exception. Example 16-14 uses this mechanism to provide the ability for one thread to wait for a second thread to do something. The class s only interesting state is a single bool field, canGo, which is initially false but will be set to true when the second thread does whatever we re waiting for that thread will call GoNow to indicate this. Since this field is going to be used from multiple threads, we need synchronization, so WaitForIt also has a lockObject field which refers to an object whose only job is to be the object for which we acquire a lock in order to protect access to canGo.
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