Admin: 1 версия

2010-06-01T06:16:52Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:44Z

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== Closed Coupled ==



<source lang="java">

File: Main.java
import java.io.PrintStream;
public class Main {
public static void main(String[] a) {
MessageData source = new MessageData("Hello, world");
MessageReporter destination = new MessageReporter();
destination.write(System.out, source.getMessage());
}
}
final class MessageData {
private final String message;
public MessageData(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
}
class MessageReporter {
public void write(PrintStream out, String message) {
out.println(message);
}
}

</source>



== Decouple With Interface ==



<source lang="java">

File: Main.java

public class Main {
public static void main(String[] a) {
MessageData source = new SimpleMessageData("Hello, world");
MessageReporter destination = new StdoutMessageReporter();
destination.write(source.getMessage());
}
}
interface MessageReporter {
void write(String message);
}
interface MessageData {
String getMessage();
}
class StdoutMessageReporter implements MessageReporter {
public void write(String message) {
System.out.println(message);
}
}
class SimpleMessageData implements MessageData {
private final String message;
public SimpleMessageData() {
this("Hello, world");
}
public SimpleMessageData(String message) {
this.message = message;
}
public String getMessage() {
return this.message;
}
}

</source>



== Spring Prototype ==



<source lang="java">

File: Main.java
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] z) {
ApplicationContext context = new ClassPathXmlApplicationContext("context.xml", Main.class);
SpringPrototypeClient client = (SpringPrototypeClient) context.getBean("prototypeClient");
client.run();
}
}
class SpringPrototypeClient {
private Message message1;
private Message message2;
public void run() {
System.out.println("Message1 " + this.message1.toString());
System.out.println("Message2 " + this.message2.toString());
System.out.println("Messages == " + (this.message1 == this.message2));
}
public void setMessage1(Message message1) {
this.message1 = message1;
}
public void setMessage2(Message message2) {
this.message2 = message2;
}
}
abstract class Message {
public Message makeCopy() {
try {
return this.getClass().newInstance();
} catch (InstantiationException e) {
return null;
} catch (IllegalAccessException e) {
return null;
}
}
}
class EmailMessage extends Message {
@Override
public String toString() {
return "EmailMessage";
}
}

File: context.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="prototypeClient"
class="SpringPrototypeClient">
<property name="message1" ref="message"/>
<property name="message2" ref="message"/>
</bean>
<bean id="message" class="EmailMessage" singleton="false"/>
</beans>

</source>



== Spring Style Decouple ==



<source lang="java">

File: helloworld-context.properties
source.(class)=SimpleMessageData
destination.(class)=StdoutMessageReporter

File: Main.java
import org.springframework.beans.factory.support.BeanDefinitionReader;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.PropertiesBeanDefinitionReader;
import org.springframework.core.io.ClassPathResource;
public class Main {
public static void main(String[] a) {
DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
BeanDefinitionReader reader = new PropertiesBeanDefinitionReader(bf);
reader.loadBeanDefinitions(new ClassPathResource("helloworld-context.properties"));
MessageData source = (MessageData) bf.getBean("source");
MessageReporter destination = (MessageReporter) bf.getBean("destination");
destination.write(source.getMessage());
}
}
interface MessageService {
void execute();
}
class DefaultMessageService implements MessageService {
private MessageData source;
private MessageReporter destination;
public void execute() {
this.destination.write(this.source.getMessage());
}
public void setSource(MessageData source) {
this.source = source;
}
public void setDestination(MessageReporter destination) {
this.destination = destination;
}
}
interface MessageReporter {
void write(String message);
}
interface MessageData {
String getMessage();
}
class StdoutMessageReporter implements MessageReporter {
public void write(String message) {
System.out.println(message);
}
}
class SimpleMessageData implements MessageData {
private final String message;
public SimpleMessageData() {
this("Hello, world");
}
public SimpleMessageData(String message) {
this.message = message;
}
public String getMessage() {
return this.message;
}
}

</source>

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Admin: 1 версия

в 18:01, 31 мая 2010