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Figure 1-1: Components of the .NET Framework Common Language Runtime .NET Class Library Unifying components Common Language Runtime The Common Language Runtime (CLR) is a layer between an application and the operating system it executes on. The CLR simplifies an application's design and reduces the amount of code developers need to write because it provides a variety of execution services that include memory management, thread management, component lifetime management, and default error handling. The key benefit of the CLR is that it transparently provides these execution services to all applications, regardless of what programming language they're written in and without any additional effort on the part of the developer. The CLR is also responsible for compiling code just before it executes. Instead of producing a binary representation of your code, as traditional compilers do, .NET compilers produce a representation of your code in a language common to the .NET Framework: Microsoft Intermediate Language (MSIL), often referred to as IL. When your code executes for the first time, the CLR invokes a special compiler called a Just In Time (JIT) compiler, which transforms the IL into executable instructions that are specific to the type and model of your system's processor. Because all .NET languages have the same compiled representation, they all have similar performance characteristics. This means that a program written in Visual Basic .NET can perform as well as the same program written in Visual C++ .NET. (C++ is the language of choice for developers who need the best possible performance a system can deliver.)

For illustration, AsynchRenderer uses explicit waiting and notification operations based on a ready flag rather than relying on Threadjoin Applications relying on this class can be written in a simple fashion:

class PicturAppWithFuture { // Code sketch private final Renderer renderer = new AsynchRenderer(); public void show(final URL imageSource) { Pic pic = rendererrender(imageSource); displayBorders(); displayCaption(); // do other things

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Many situations require Web applications to retrieve, add, modify, and delete data stored in a database on a server. For example, consider a Web application that enables users to register as customers. When a customer fills out the Registration form and submits it, the customer registration information must be stored in a database on a server so as to maintain the registered customer's records. After the registration, the customer might need to change their customer details, such as telephone number or address. Later, the customer might want to discontinue purchasing from the same store. In such a situation, the Web application must take care of addition, modification, and deletion of data in the respective database on a server. In this section, you'll create a Web application to retrieve, add, modify, and delete data in a table stored on a SQL server. You can choose to use either Visual Basic or C# to do so. In the following example, you'll create a Visual Basic Web application project. Figure 12-1 displays the schematic diagram of the tables used to illustrate the server-side data access from a Web application.

byte[] im = picgetImage(); if (im != null) displayImage(im); else // deal with assumed rendering failure }

4331 Callables Most designs based on Futures take exactly the form illustrated in class AsynchRenderer The construction and use of such classes can be further standardized and automated by stepping up to a blander interface

Figure 12-1: A schematic diagram of the Sales database Before you start implementing T-SQL in your Web application, create the tables as shown in the preceding schematic diagram. Also, add records in the Products and Customers tables. You can refer to Figure 12-2 and Figure 12-3 to add records in the Products and Customers tables.

In the same way that interface Runnable describes any pure action, a Callable interface can be used to describe any service method that accepts an Object argument, returns an Object result, and may throw an Exception:

interface Callable { Object call(Object arg) throws Exception; }

Figure 12-2: A sample Order form After creating the ASP.NET Web Application project, design two Web Forms as shown in Figure 12-2 and Figure 12-3. The Order form will enable customers on the Web to place orders for products. Refer to Table 12-2 to specify IDs for the controls (that are used in code examples) on the Order form. In this form, you'll implement the functionality to view the complete product list or to view the details of a specific product. For this to happen, you'll access data from the Products table in a database called "Sales" stored on a SQL server.

The use of Object here (awkwardly) accommodates, for example, adaptation of methods accepting multiple arguments by stuffing them into array objects While there are other options, it is most convenient to package up support mechanics via a single class that coordinates usage The following FutureResult class shows one set of choices (It is a streamlined version of one in the utilconcurrent package available from the online supplement) The FutureResult class maintains methods to get the result Object that is returned, or the Exception that is thrown by a Callable Unlike our Pic versions where all failures were just indicated via null values, it deals with interruptions more honestly by throwing exceptions back to clients attempting to obtain results To differentiate properly between exceptions encountered in the service versus those encountered trying to execute the service, exceptions thrown by the Callable are repackaged using javalangreflectInvocationTargetException, a general-purpose class for wrapping one exception inside another Also, for the sake of generality, the FutureResult does not itself create threads Instead, it supports method setter that returns a Runnable that users can then execute within a thread or any other code Executor (see 414) This makes Callables usable within lightweight executable frameworks that are otherwise set up to handle tasks initiated via oneway messages As an alternative strategy, you could set up a Caller framework that is otherwise similar to Executor, but is more specialized to the needs of service-style tasks, for example supporting methods to schedule execution, check status, and control responses to exceptions

class FutureResult { // Fragments protected Object value = null; protected boolean ready = false; protected InvocationTargetException exception = null; public synchronized Object get() throws InterruptedException, InvocationTargetException { while (!ready) wait(); if (exception != null) throw exception; else return value; }

Figure 12-3: A sample Customer form Table 12-2: IDs of the Controls on the Order Forms Control Order ID TexBox ID Order_ID

public Runnable setter(final Callable function) { return new Runnable() { public void run() { try { set(functioncall()); } catch(Throwable e) { setException(e); } } }; } synchronized void set(Object result) { value = result; ready = true; notifyAll(); } synchronized void setException(Throwable e) { exception = new InvocationTargetException(e); ready = true; notifyAll(); } // other auxiliary and convenience methods }

The FutureResult class can be used directly to support generic Futures or as a utility in constructing more specialized versions As an example of direct use:

Table 12-2: IDs of the Controls on the Order Forms Control Customer ID TextBox Product ID TextBox Quantity TextBox Order Date TextBox Data Grid ID Customer_ID Product_ID Order_Quantity Order_Date MyDataGrid

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