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When interpreting the values for the motors, you default to having both motors stopped B. Note that the B and C motors are managed separately. You check whether the y sensor value is outside the y quiet zone C. If the sensed value is beyond the titled forward boundary, you move the robot forward. Likewise, if the sensed value is further back than the resting position, you move the robot backward by marking both motors to be turned backward. If the robot hasn t been determined to be going either forward or backward, you check for the lateral options of left and right D. If the robot is moving forward or backward, the speed is set to 75% E. If the robot is to be spinning, its power is set to 50% F. The final step is to translate these movement masks into real actions by modifying the condition of the motors G and to update the UI to reflect these commands. Once the onSensorChanged method has completed processing the SensorEvent data, it s time to drive the robot s motors and update the user interface.
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The responsibility for returning the correct columns, for all properties and foreign key associations of the class with the same names as in the regular mappings, is now moved into the stored procedure code. Because you have aliases in the stored procedure already (select ... us.FIRSTNAME as FIRSTNAME...), this is straightforward. Or, if only some of the columns returned in the result of the procedure have different names than the ones you mapped already as your properties, you only need to declare these:
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JTA providers don t add unnecessary overhead at runtime (a common misconception). The simple case (a single JDBC database) is handled as efficiently as with plain JDBC transactions. The connection pool managed behind a JTA service is probably much better software than a random connection pooling library you d use with plain JDBC.
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Now that you know how to create a table both in the live system and in development storage, it s worth taking a quick peek at how this is implemented in the development storage backing store. Figure 11.6 shows how tables are represented in the development storage SQL Server database. As you can see in figure 11.6, the SQL Server database that stores the entities is pretty flexible. The TableContainer table keeps a list of all the tables stored in the development storage account. Because you can create tables dynamically, any new table created will contain a new entry in this table. Each row in the TableRow table in figure 11.6 stores a serialized version of the entity. As you can see from this table definition, the only fixed data that s stored in this table is AccountName, TableName, PartitionKey, RowKey, and TimeStamp. All other properties are stored in the Data column. As you can see, the actual development storage schema relates to the logical representation that you saw in table 11.4. Now that you ve seen how tables are represented in development storage, let s look at how you can start working with your entities.
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The customer wanted to know if it were possible to configure the FSSlaveDirectoryProvider to not have an indexBase (slave copies of the master index from the index source located on the server cluster) and configure only a sourceBase (index source location) to prevent the copying cycle from reaching the outlying servers. This would make the index source copy of the master index in figure 10.2 the slave index. This is possible but not out of the box. The customer would have to write its own DirectoryProvider. Emmanuel s recommendations were:
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SOME is just an alias (or a synonym) for ANY, and can be used anywhere ANY can
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The call to Find will go to the appropriate method, depending on the actual type of c at runtime. This supports the Composite pattern s ideal of having Components and Composites be treated the same. That completes the theoretical Composite pattern implementation. Apart from the concern with the Display method, the three preceding types can be used together for any elements. Thus, we can put them in a namespace called CompositePattern for use in the next example.Example: Photo Library In this example, we are concerned with collecting the filenames of digital photos into named sets. We will not use actual images in this example, just filenames as strings. The client is given a domain-specific set of commands with which to create and manipulate the library. Central to the manipulation of the library, from the user s point of view, is where we are. We start out at an empty set called Album. Some
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Listing 23.7 A Configuration object that creates a session factory barcode generator using code39
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This view uses a master page, which is similar to what you d see in an ASP.NET Web Forms project. If you re curious, you can find this in /Views/Shared/Site.Master, but for now we can just focus on the view. This view will render the data provided by the controller. It shouldn t contain any complex logic. Keeping the view simple makes it easy to read and maintain, especially because we ll be mixing code with HTML. In listing 1.3, you can see that it outputs a message inside a code block denoted by <%= %> tags. To illustrate working with the ASP.NET MVC Framework, we ll add some guestbook features to this application. The first step is adding a new controller.
/** * Don't do this! Class tags can't appear before the * package statement. * @hibernate.class */ package com.manning.hq.ch09; public class Event implements Serializable { }
String username = ejbContext.getPrincipal().getName();
15.4.2 Understanding the query cache
Transparent persistence fosters a degree of portability; without special interfaces, the persistent classes are decoupled from any particular persistence solution. Our business logic is fully reusable in any other application context. We could easily change to another transparent persistence mechanism. By this definition of transparent persistence, you see that certain non-automated persistence layers are transparent (for example, the DAO pattern) because they decouple the persistence-related code with abstract programming interfaces. Only plain Java classes without dependencies are exposed to the business logic. Conversely, some automated persistence layers (including entity beans and some ORM solutions) are non-transparent, because they require special interfaces or intrusive programming models. We regard transparency as required. In fact, transparent persistence should be one of the primary goals of any ORM solution. However, no automated persistence solution is completely transparent: Every automated persistence layer, including Hibernate, imposes some requirements on the persistent classes. For example, Hibernate requires that collection-valued properties be typed to an interface such as java.util.Set or java.util.List and not to an actual implementation such as java.util.HashSet (this is a good practice anyway). (We discuss the reasons for this requirement in appendix B, ORM implementation strategies. ) You now know why the persistence mechanism should have minimal impact on how you implement a domain model and that transparent and automated persistence are required. EJB isn t transparent, so what kind of programming model should you use Do you need a special programming model at all In theory, no;
The iPhone Simulator comes as part of the iPhone SDK, but even if you re not planning to do any SDK programming, it might be worth getting the current version of the SDK (though the download is quite large, at over 1 GB at the time of this writing). We ll talk more about what all is in the SDK package (and how to get it) in chapter 10. The iPhone Simulator doesn t come with any additional development tools, like the other browsers we ve been talking about, but it provides the most precise simulation of an iPhone that you ll find, other than using the iPhone itself (and though we both have iPhones sitting right on our desks, hooked up to our computers, we still find it faster to pop up the Simulator, even to test out a simple web page, let alone SDK programs that require downloading). Besides looking at pages on your iPhone Simulator, you can also rotate the iPhone left or right using the arrows keys. Perhaps most importantly, you can simulate twofinger gestures by holding down the option key when you scroll over the Simulator. Option-shift will additionally lock these fingers in relation to each other, allowing you to generate a two-fingered scroll event. Seeing exactly what things look like on an iPhone should help you quickly resolve many purely visual problems with your iPhone web code. With that said, we re going to leave servers and browsers behind, and instead move on to more in-depth debugging tools.
Modifies the current clipping path by intersecting it with the current path, using the nonzero winding rule. Modifies the current clipping path by intersecting it with the current path, using the even-odd rule.
Unit testing with JUnit and DBUnit
ajaxUpdate: function(request) { var slaveOptions = this.createOptions( request.responseXML.documentElement); Clear any existing options this.slave.length = 0; for ( var i = 0 ; i < slaveOptions.length ; i++ ) try{ this.slave.add(slaveOptions[i],null); Populate }catch (e){ new options this.slave.add(slaveOptions[i],-1); } },
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myMenu = [[SKMenu alloc] initWithFile:@"nav.db"]; DatabaseViewController *newController = [[DatabaseViewController alloc] initWithParentid:0 Menu:myMenu]; newController.title = @"DB Menu"; [self.navigationController pushViewController:newController animated:NO]; [newController release]; [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; } - (void)dealloc {
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