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These using directives help the C# compiler work out what external code this particular source file will be using. No code is an island to get any useful work done, your programs will rely on other code. All C# programs depend on the .NET Framework class library, for example: the one line of code we added to our program uses the class library to display a message. Using directives can declare an intent to use classes from any library yours, Microsoft s, or anyone s. All the directives in our example start with System, which indicates that we want to use something from the .NET Framework. This text that follows the using keyword denotes a namespace.
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the official solution, you can t get repeatable-read database transaction isolation and at the same time disable automatic flushing. The persistence-context cache can provide repeatable read only for entity queries, not for scalar queries. We highly recommend that you consider Hibernate s FlushMode.MANUAL setting if you implement conversations with JPA. We also expect that this problem will be fixed in a future release of the specification; (almost) all JPA vendors already include a proprietary flush mode setting with the same effect as org.hibernate.FlushMode.MANUAL. You now know how to write JPA conversations with detached entity instances and extended persistence contexts. We laid the foundation in the previous sections for the next step: the implementation of conversations with JPA and EJBs. If you now have the impression that JPA is more cumbersome than Hibernate, we think you may be surprised at how easy conversations are to implement once you introduce EJBs.
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We want a task wrapper to this functionality instead of using the <java> task. Invoking it with <java> is accomplish in this manner:
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Let s begin by reviewing the standard Ajax architecture, in order to identify the vulnerability that we ll discuss in this section. The client, once it is running in the user s browser, makes requests to the server using HTTP. These requests are serviced by web server processes (servlets, dynamic pages, or whatever) that return streams of data to the client, which it parses. Figure 7.8 summarizes the situation. The web services or pages are accessible by external entities, without any additional work on our part that s just how the Internet works. It may be that we encourage outsiders to use our web services in this way, and we may even publish an API, as eBay, Amazon, and Google, among others, have done. Even in this case, though, we need to keep security in mind. There are two things we can do, which we discuss in the following two sections. First, we can design our web services interface, or API, in such a way that external entities cannot subvert the purpose of our web application say, by ordering goods without paying for them. Second, we look at techniques to restrict access to the web services to particular parties.
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The Debug menu allows you to start an application with or without debugging, set breakpoints in the code, and control the debugging session.
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Note that a two-way reference between the DOM element domEl and the domain object itself is created. Below, the event-handler function referenced in the constructor:
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It is very likely you have come across the term aspect-oriented programming (AOP). The essential idea behind AOP is that for most applications, common application code repeated across modules not necessarily for solving the core business problem are considered as infrastructure concerns. The most commonly cited example of this is logging, especially at the basic debugging level. To use our ActionBazaar example, let s assume that we log the entry into every method in the system. Without AOP, this would mean adding logging statements at the beginning of every single method in the system to log the action of entering method XX ! Some other common examples where AOP applies are auditing, profiling, and statistics. The common term used to describe these cases is crosscutting concerns concerns that cut across application logic. An AOP system allows the separation of crosscutting concerns into their own modules. These modules are then applied across the relevant cross section of application code, such as the beginning of every method call. Tools like AspectJ have made AOP relatively popular. For great coverage of AOP, read AspectJ in Action by Ramnivas Laddad (Manning, 2003). EJB 3 supports AOP-like functionality by providing the ability to intercept business methods and lifecycle callbacks. Now buckle up and get ready to jump into the world of EJB 3 interceptors, where you ll learn what interceptors are and how to build business method and lifecycle callback interceptors.
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DefaultLocation CodeLocation.ID value for the location that is set as the default. FineGrace
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<hibernate-mapping> <class name="BillingDetails" table="BILLING_DETAILS"> <id name="id" column="BILLING_DETAILS_ID" type="long"> <generator class="native"/>
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Listing 10.14 Dynamically finding the position of a nonpositioned element
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Protected Sub btnPurchase_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles btnPurchase.Click
</java> </target>
The path specified can have its elements separated by either a semicolon (;) or colon (:) and directories separated by either forward-slash (/) or back-slash (\),3 regardless of operating system, making it extremely friendly for cross-platform use. If a path structure only consists of a single path or location, it can be specified using a shortcut form as in <classpath location="lib/some.jar"/> or <classpath path="build/classes;lib/some.jar"/>. Paths can also include a set of files:
In this example, we are including the user s login ID as part of the JNDI name used to look up the data source. The JNDI name is constructed by concatenating the user ID with a base String value. This is only an example implementation for switching data sources; you could easily have an if-else statement or some other switching logic. You will actually create the data sources using the application server console or configuration file, so check your vendor s documentation for more information. However, using the ejb-jar.xml deployment file of your beans, you should add a resource description of the data sources you will want your beans to access. In our recipe, we included two data sources, each with a user ID as part of the JNDI name (the <resource-ref-name/> element) for looking up the resource. Many similar ways to implement a solution such as this one exist, but doing something like this will free you from having to code detailed data-access restrictions. Instead of using the username to build the data source name, you could easily use a role name allowing for a larger group of users to be assigned to a single data source.
< xml version="1.0" encoding="ISO-8859-1" > <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.0//EN" ""> <struts-config> ...etc.
<property name="context.someProperty" value="someValue"/>
Figure 8.1 Security, distribution, transactional awareness, and failover are all available to the EJB entity bean, but most clients access entity beans through a Session Fa ade. For this reason, these services are irrelevant to the discussion about the merits of EJB entity beans, for all of the most practical purposes.
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