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The Command pattern turns the request itself into an object.
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This is illustrated in the second code sample example below, called TestTransactionCommand.java. We also exploit Java's unique dynamic loading and binding mechanisms to build a dynamic and dynamically extensible system. (For details on Java's dynamic loading and binding mechanism, see James Gosling and Henry McGilton's "The Java Language Environment - A White Paper," listed in Resources.)īy following the above suggestion, we exploit the polymorphism provided by the application of a Command pattern to eliminate giant switch statements, resulting in extensible systems. Therefore, I suggest you use the Command pattern combined with Java's dynamic loading and binding mechanism to implement function pointers. Instead, you should define an interface and implement it in the classes that perform the needed action. (See Resources for links to Tremblett's article and for Sun's Reflection tutorial page.) Your program will be easier to debug and maintain if you don't use Method objects.
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I've resisted this temptation, since Sun advises against using the Reflection API when other tools more natural to the Java programming language will suffice.
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For example, in his article "Java Reflection," Paul Tremblett shows you how to use Reflection to implement transactions without using switch statements. You'll see this in action in the first code example below, called TestCommand.java.ĭevelopers accustomed to using function pointers in another language might be tempted to use the Method objects of the Reflection API in the same way. (See " Java Tip 30: Polymorphism and Java" for a more detailed description.) Since Java doesn't have function pointers, we can use the Command pattern to implement callbacks. In programming languages like C, function pointers are used to eliminate giant switch statements. Therefore, a Command pattern provides us flexibility as well as extensibility. The Command pattern also allows us to vary when and how a request is fulfilled. With decoupling, the sender has no knowledge of the Receiver's interface.) The term request here refers to the command that is to be executed. (A sender is an object that invokes an operation, and a receiver is an object that receives the request to execute a certain operation. A Command pattern is an object behavioral pattern that allows us to achieve complete decoupling between the sender and the receiver. Design patterns not only accelerate the design phase of an object-oriented (OO) project but also increase the productivity of the development team and quality of the software.