crystal reports barcode generator free AspectJ: syntax basics in Java

Drawing Quick Response Code in Java AspectJ: syntax basics

AspectJ: syntax basics
Make QR Code In Java
Using Barcode drawer for Java Control to generate, create QR Code image in Java applications.
www.OnBarcode.com
QR Code Reader In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Figure 3.4 shows the context being passed between an anonymous pointcut and the advice. The target() pointcut collects the objects on which the credit() method is being invoked, whereas the args() pointcut captures the argument to the method. The part of the advice before the colon specifies the type and name for each of the captured arguments. The body of the advice uses the collected context in the same way that the body of a method would use the parameters passed to it. The object identifiers in the previous code snippet are account and amount. When you use named pointcuts, those pointcuts themselves must collect the context and pass it to the advice. Figure 3.5 shows the collection of the same information as in figure 3.4, but uses named pointcuts to capture the context and make it available to the advice. The code in figure 3.5 is functionally identical to that in 3.4, but unlike figure 3.4, we use a named pointcut. The pointcut creditOperation(), besides matching join points, collects the context so that the advice can use it. We collect the target object and the argument to the credit() operation. Note that the pointcut itself declares the type and name of each collected element, much like a method call. In the advice to this pointcut, the first part before the colon is unchanged from figure 3.4. The pointcut definition simply uses the earlier defined pointcut. Note how the names of the arguments in the first part of the advice match those in the pointcut definition. Let s look at some more examples of passing context. In figure 3.6, an after returning advice captures the return value of a method.
Code 128 Code Set A Creation In Java
Using Barcode encoder for Java Control to generate, create Code 128C image in Java applications.
www.OnBarcode.com
PDF-417 2d Barcode Creation In Java
Using Barcode encoder for Java Control to generate, create PDF 417 image in Java applications.
www.OnBarcode.com
Figure 3.5 Passing an executing object and an argument captured by a named pointcut. This code snippet is functionally equivalent to figure 3.4, but achieves it using a named pointcut. For the advice to access the join point s context, the pointcut itself must collect the context, as opposed to the advice collecting the context when using anonymous pointcuts.
Encoding GS1 128 In Java
Using Barcode creation for Java Control to generate, create UCC.EAN - 128 image in Java applications.
www.OnBarcode.com
Drawing Data Matrix In Java
Using Barcode generator for Java Control to generate, create Data Matrix image in Java applications.
www.OnBarcode.com
Advice
2D Barcode Creator In Java
Using Barcode encoder for Java Control to generate, create 2D image in Java applications.
www.OnBarcode.com
GTIN - 14 Creator In Java
Using Barcode encoder for Java Control to generate, create UCC - 14 image in Java applications.
www.OnBarcode.com
Figure 3.6 Passing a return object context to an advice body. The return object is captured in returning() by specifying the type and object ID.
QR-Code Decoder In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Generating Denso QR Bar Code In None
Using Barcode creation for Microsoft Excel Control to generate, create QR Code 2d barcode image in Office Excel applications.
www.OnBarcode.com
Figure 3.7 Passing a thrown exception to an advice body. The exception object is captured in throwing() by specifying the type and object ID. The special variables such as thisJoinPoint are accessed in a similar manner to this inside an instance method.
Creating EAN-13 In Visual Studio .NET
Using Barcode encoder for .NET framework Control to generate, create EAN-13 Supplement 5 image in VS .NET applications.
www.OnBarcode.com
Barcode Drawer In Java
Using Barcode drawer for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
In figure 3.6, we capture the return value of DriverManager.getConnection() by specifying the type and the name of the return object in the returning() part of the advice specification. We can use the return object in the advice body just like any other collected context. In this example, the advice simply prints the return value. In figure 3.7, we capture the exception object thrown by any method that declares that it can throw RemoteException by specifying the type and name of the exception to the throwing() part of the advice specification. Much like the return value and any other context, we can use this exception object in the advice body. Note that thisJoinPoint is a special type of variable that carries join point context information. We will look at these types of variables in detail in chapter 4. 3.2.7 Returning a value from around advice Each around advice must declare a return value (which could be void). It is typical to declare the return type to match the return type of the join points that are being advised. For example, if a set of methods that are each returning an integer were advised, you would declare the advice to return an integer. For a field-read join point, you would match the advice s return type to the accessed field s type.
Scanning UPC-A Supplement 5 In .NET Framework
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Decode Barcode In .NET
Using Barcode reader for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Code 39 Full ASCII Reader In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Generate Barcode In .NET Framework
Using Barcode maker for Visual Studio .NET Control to generate, create Barcode image in .NET framework applications.
www.OnBarcode.com
QR Code Maker In VB.NET
Using Barcode creation for VS .NET Control to generate, create Quick Response Code image in .NET applications.
www.OnBarcode.com
PDF-417 2d Barcode Reader In .NET
Using Barcode reader for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Code 3 Of 9 Generator In None
Using Barcode creator for Online Control to generate, create Code39 image in Online applications.
www.OnBarcode.com
Making Code39 In Visual Basic .NET
Using Barcode generation for Visual Studio .NET Control to generate, create Code 39 Extended image in VS .NET applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.