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d concerns or having some means by which the effect of changes can be inferred for example consider a banking application with a conceptually very simple method for transferring an amount from one account to another such an example in java looks like sealed class bankingexception extends exception permits insufficientfundsexception unauthoriseduserexception public class bank public void transfer account fromacc account toacc int amount throws bankingexception if fromacc getbalance amount throw new insufficientfundsexception fromacc withdraw amount toacc deposit amount however this transfer method overlooks certain considerations that a deployed application would require such as verifying that the current user is authorized to perform this operation encapsulating database transactions to prevent accidental data loss and logging the operation for diagnostic purposes a version with all those new concerns might look like this import java util logging sealed class bankingexception extends exception permits insufficientfundsexception unauthoriseduserexception public class bank private static final logger logger private final database database public void transfer account fromacc account toacc int amount user user throws bankingexception logger info transferring money if isuserauthorised user fromacc logger log level warning user has no permission throw new unauthoriseduserexception if fromacc getbalance amount logger log level warning insufficient funds throw new insufficientfundsexception fromacc withdraw amount toacc deposit amount database commitchanges atomic operation logger log level info transaction successful in this example other interests have become tangled with the basic functionality sometimes called the business logic concern transactions security and logging all exemplify cross cutting concerns now consider what would happen if we suddenly need to change the security considerations for the application in the program s current version security related operations appear scattered across numerous methods and such a change would require major effort aop tries to solve this problem by allowing the programmer to express cross cutting concerns in stand alone modules called aspects aspects can contain advice code joined to specified points in the program and inter type declarations structural members added to other classes for example a security module can include advice that performs a security check before accessing a bank account the pointcut defines the times join points when one can access a bank account and the code in the advice body defines how the security check is implemented that way both the check and the places can be maintained in one place further a good pointcut can anticipate later program changes so if another developer creates a new method to access the bank account the advice will apply to the new method when it executes so for the example above implementing logging in an aspect aspect logger logger logger void bank transfer account fromacc account toacc int amount user user logger info transferring money void bank getmoneyback user user int transactionid logger info user requested money back other crosscutting code one can think of aop as a debugging tool or a user level tool advice should be reserved for cases in which one cannot get the function changed user level 5 or do not want to change the function in production code debugging join point models edit the advice related component of an aspect oriented language defines a join point model jpm a jpm defines three things when the advice can run these are called join points because they are points in a running program where additional behavior can be usefully joined a join point needs to be addressable and understandable by an ordinary programmer to be useful it should also be stable across inconsequential program changes to maintain aspect stability many aop implementations support method executions and field references as join points a way to specify or quantify join points called pointcuts pointcuts determine whether a given join point matches most useful pointcut languages use a syntax like the base language for example aspectj uses java signatures and allow reuse through naming and combination a means of specifying code to run at a join point aspectj calls this advice and can run it before after and around join points some implementations also support defining a method in an aspect on another class join point models can be compared based on the join points exposed how join points are specified the operations permitted at the join points and the structural enhancements that can be expressed aspectj s join point model edit main article aspectj the join points in aspectj include method or constructor call or execution the initialization of a class or object field read and write access and exception handlers they do not include loops super calls throws clauses or multiple statements pointcuts are specified by combinations of primitive pointcut designators pcds kinded pcds match a particular kind of join point e g method execution and often take a java like signature as input one such pointcut looks like this execution set this pointcut matches a method execution join point if the method name starts with set and there is exactly one argument of any type dynamic pcds check runtime types and bind variables for example this point this pointcut matches when the currently executing object is an instance of class point note that the unqualified name of a class can be used via java s normal type lookup scope pcds limit the lexical scope of the join point for example within com company this pointcut matches any join point in any type in the com company package the is one form of the wildcards that can be used to match many things with one signature pointcuts can be composed and named for reuse for example pointcut set execution set this point within com company this pointcut matches a method execution join point if the method name starts with set and this is an instance of type point in the com company package it can be referred to using the name set advice specifies to run at before after or around a join point specified with a pointcut certain code specified like code in a method the aop runtime invokes advice automatically when the pointcut matches the join point for example after set display update this effectively specifies if the set pointcut matches the join point run the code display update after the join point completes other potential join point models edit there are other kinds of jpms all advice languages can be defined in terms of their jpm for example a hypothetical aspect language for uml may have the following jpm join points are all model elements pointcuts are some boolean expression combining the model elements the means of affect at these points are a visualization of all the matched join points inter type declarations edit inter type declarations provide a way to express cross cutting concerns affecting the structure of modules also known as open classes and extension methods this enables programmers to declare in one place members or parents of another class typically to combine all the code related to a concern in one aspect for example if a programmer implemented the cross cutting display update concern using visitors an inter type declaration using the visitor pattern might look like this in aspectj aspect displayupdate void point acceptvisitor visitor v v visit this other crosscutting code this code snippet adds the acceptvisitor method to the point class any structural additions are required to be compatible with the original class so that clients of the existing class continue to operate unless the aop implementation can expect to control all clients at all times implementation edit aop programs can affect other programs in two different ways depending on the underlying languages and environments a combined program is produced valid in the original language and indistinguishable from an ordinary program to the ultimate interpreter the ultimate interpreter or environment is updated to understand and implement aop features the difficulty of changing environments means most implementations produce compatible combination programs through a type of program transformation known as weaving an aspect weaver reads the aspect oriented code and generates appropriate object oriented code with the aspects integrated the same aop language can be implemented through a variety of weaving methods so the semantics of a language should never be understood in terms of the weaving implementation only the speed of an implementation and its ease of deployment are affected by the method of combination used systems can implement source level weaving using preprocessors as c was implemented originally in cfront that require access to program source files however java s well defined binary form enables bytecode weavers to work with any java program in class file form bytecode weavers can be deployed during the build process or if the weave model is per class during class loading aspectj started with source level weaving in 2001 delivered a per class bytecode weaver in 2002 and offered advanced load time support after the integration of aspectwerkz in 2005 any solution that combines programs at runtime must provide views that segregate them properly to maintain the programmer s segregated model java s bytecode support for multiple source files enables any debugger to step through a properly woven class file in a source editor however some third party decompilers cannot process woven code because they expect code produced by javac rather than all supported bytecode forms see also criticism below deploy time weaving offers another approach 6 this basically implies post processing but rather than patching the generated code this weaving approach subclasses existing classes so that the modifications are introduced by method overriding the existing classes remain untouched even at runtime and all existing tools such as debuggers and profilers can be used during development a similar approach has already proven itself in the implementation of many java ee application servers such as ibm s websphere terminology edit standard terminology used in aspect oriented programming may include cross cutting concerns main article cross cutting concern even though most classes in an object oriented model will perform a single specific function they often share common secondary requirements with other classes for example we may want to add logging to classes within the data access layer and also to classes in the ui layer whenever a thread enters or exits a method further concerns can be related to security such as access control 7 or information flow control 8 even though each class has a very different primary functionality the code needed to perform the secondary functionality is often identical advice main article advice programming this is the additional code that you want to apply to your existing model in our example this is the logging code that we want to apply whenever the thread enters or exits a method pointcut main article pointcut this refers to the point of execution in the application at which cross cutting concern needs to be applied in our example a pointcut is reached when the thread enters a method and another pointcut is reached when the thread exits the method aspect main article aspect computer science the combination of the pointcut and the advice is termed an aspect in the example above we add a logging aspect to our application by defining a pointcut and giving the correct advice comparison to other programming paradigms edit aspects emerged from object oriented programming and reflective programming aop languages have functionality similar to but more restricted than metaobject protocols aspects relate closely to programming concepts like subjects mixins and delegation other ways to use aspect oriented programming paradigms include composition filters and the hyperslices approach since at least the 1970s developers have been using forms of interception and dispatch patching that resemble some of the implementation methods for aop but these never had the semantics that the cross cutting specifications provide in one place citation needed designers have considered alternative ways to achieve separation of code such as c s partial types but such approaches lack a quantification mechanism that allows reaching several join points of the code with one declarative statement citation needed though it may seem unrelated in testing the use of mocks or stubs requires the use of aop techniques such as around advice here the collaborating objects are for the purpose of the test a cross cutting concern thus the various mock object frameworks provide these features for example a process invokes a service to get a balance amount in the test of the process it is unimportant where the amount comes from but only that the process uses the balance according to the requirements citation needed adoption issues edit programmers need to be able to read and understand code to prevent errors 9 even with proper education understanding cross cutting concerns can be difficult without proper support for visualizing both static structure and the dynamic flow of a program 10 starting in 2002 aspectj began to provide ide plug ins to support the visualizing of cross cutting concerns those features as well as aspect code assist and refactoring are now common given the power of aop making a logical mistake in expressing cross cutting can lead to widespread program failure conversely another programmer may change the join points in a program such as by renaming or moving methods in ways that the aspect writer did not anticipate and with unforeseen consequences one advantage of modularizing cross cutting concerns is enabling one programmer to easily affect the entire system as a result such problems manifest as a conflict over responsibility between two or more developers for a given failure aop can expedite solving these problems as only the aspect must be changed without aop the corresponding problems can be much more spread out citation needed criticism edit the most basic criticism of the effect of aop is that control flow is obscured and that it is not only worse than the much maligned goto statement but is closely analogous to the joke come from statement 10 the obliviousness of application which is fundamental to many definitions of aop the code in question has no indication that an advice will be applied which is specified instead in the pointcut means that the advice is not visible in contrast to an explicit method call 10 11 for example compare the come from program 10 5 input x 10 print result is 15 print x 20 come from 10 25 x x x 30 return with an aop fragment with analogous semantics main input x print result x input result int x return x around int x call result i...