Aspect Instantiation in Font

Encoder Data Matrix in Font Aspect Instantiation

Aspect Instantiation
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By default, a unique instance of an aspect is created when the application is launched. The aspect is then said to be a singleton. The same aspect instance is shared by all the application objects. In special cases, it can be useful to create several instances of a given aspect. Different application objects are then aspectized by the different instances. For example, this feature can be used to dedicate different pieces of data to each part of the application. The three following cases can occur: The aspect is a singleton, and only one instance of the aspect exists at run time. This is the default case. The aspect is instantiated several times, and the instances are associated with different application objects. The aspect is instantiated several times, and the instances are associated with different control-flow sequences of the application. No keyword exists for the first case because this is the default behavior when the aspect keyword is used. For the second case, two keywords are available: perthis and pertarget. The aspects can then be written as follows: aspect <name> perthis( <poincut> ) { ... } aspect <name> pertarget( <poincut> ) { ... } When perthis is used, an instance of the aspect is created for every object that is an executing object of the given pointcut. The other objects (those that are not executing objects of the pointcut) are not aspectized. When pertarget is used, an instance of the aspect is created for every object that is the target object of the given pointcut. For the third case, two keywords are available: percflow and percflowbelow. The aspects can then be written as follows:
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CHAPTER 3 ASPECTJ
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aspect <name> percflow( <poincut> ) { ... } aspect <name> perclfowbelow( <poincut> ) { ... } When percflow is used, an aspect instance is created each time the application enters the control-flow sequence that is designated by the pointcut. As for the cflow operator in pointcut definitions, the joinpoints belongs to the control flow. When percflowbelow is used, an aspect instance is created each time the application enters the control-flow sequence that is designated by the pointcut, but the joinpoints are not included in the control flow. The static aspectOf method is defined for each aspect and returns the aspect instance that is currently in use. For example, in the singleton TraceAspect aspect, the call TraceAspect. aspectOf() returns the reference to the singleton. For the perthis and pertarget types, a parameter must be passed when aspectOf is called; this parameter gives the source or the target object that is associated with the requested instance. For the percflow and percflowbelow types, no parameters are needed. The method returns the aspect instance or null, depending on whether the current run is included in the control-flow sequences that are defined for the aspects.
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Aspect Ordering
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When two or more aspects apply to the same joinpoint, the execution order of these aspects must be determined. AspectJ allows you to define explicit ordering rules. This is called explicit ordering. If the rules are undefined, the compiler automatically orders the aspects. This is called implicit ordering.
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Explicit Ordering
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The declare precedence keyword combination allows you to declare the execution order of different aspects. The following code illustrates the usage of this keyword combination: aspect GlobalOrder { declare precedence: Authentication, Trace; } aspect Authentication { ... } aspect Trace { ... } In the previous code, the Authentication aspect is always executed before Trace is. Wildcards can be used in the aspect names that are associated with declare precedence. Despite the location of the definition, the order is valid for the whole program. The declare precedence keyword combination can be used several times in a program. If the given orders are inconsistent, the AspectJ compiler raises an error.
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