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Let us put all worries about different versions of dependent libraries and even the JARs that make up the Spring distribution aside and write a Hello, World application. Throughout this chapter, we will improve this application using traditional programming and then refactor the application to use the Spring Framework. Listing 2-3 shows a typical Hello, World application. Listing 2-3. Typical Hello, World public class TypicalHelloWorld { public static void main(String[] args) { System.out.println("Hello, world."); } } The code is trivial but also completely impossible to extend or modify. If we wanted to print the message to standard error stream, we would need to modify the source code and recompile. It would be nice if we had one piece of code that provided the message and other code that took care of outputting the message. Our first attempt could be the code in Listing 2-4. Listing 2-4. Attempt to Make the Hello, World Application More Generic final class MessageSource { private final String message; public MessageSource(String message) { this.message = message; } public String getMessage() { return message; } } class MessageDestination { public void write(PrintStream out, String message) { out.println(message); } } public class CloselyCoupledHelloWorld { public static void main(String[] args) { MessageSource source = new MessageSource("Hello, world"); MessageDestination destination = new MessageDestination(); destination.write(System.out, source.getMessage()); } }

This code looks more generic and more configurable but is actually even worse than the original code in Listing 2-3: it is still too closely coupled but is more complicated. We can achieve significant improvement if we make the MessageSource and MessageDestination interfaces and change the MessageDestination s write method so that it does not require the PrintStream argument. Figure 2-5 shows a UML diagram of the changed solution.

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The third tenet is one of the most important ones: services share schema and contracts, not class. In object-oriented (OO) programming, abstractions are developed in the form of classes. They are very convenient, as they share both structure and behavior in a single named unit. This is not the case in SO, as services interact based only on schemas (for structure) and contracts (for behavior). Every service we build must advertise a contract that describes the messages it can send or receive. Even though this simplifies things, we must still be aware that these schemas and contracts remain stable over time. We can t change these after they are implemented, because if we do, we break the contracts with all existing service consumers.

Figure 2-5. UML class diagram of the refactored application Now, this approach is much better. The DecoupledHelloWorld class directly uses only the interfaces; each interface has only one implementation. However, the DecoupledHelloWorld still needs to create the instances of the interfaces (see Listing 2-5). Listing 2-5. Still Closely Coupled Implementation of Hello, World public class DecoupledHelloWorld { public static void main(String[] args) { MessageSource source = new SimpleMessageSource("Hello, world"); MessageDestination destination = new StdoutMessageDestination(); destination.write(source.getMessage()); } } The problematic lines are in bold: even though the rest of the code uses the interfaces, the DecoupledHelloWorld application is directly aware of the implementations. It would be better if we could use some kind of factory. This factory would could use arbitrarily complex configuration rules and ultimately return properly configured instances of the MessageSource and MessageDestination implementations. Review the UML diagram in Figure 2-6, which illustrates the factory.

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