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Merge pull request #15059 from wxy/20190715-Understanding-software-design-patterns

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PRF:20190715 Understanding software design patterns
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Xingyu.Wang 2019-08-19 18:01:05 +08:00 committed by GitHub
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1 changed files with 98 additions and 98 deletions
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@ -69,17 +69,17 @@ package org.opensource.demo.singleton;
public class OpensourceSingleton {
    private static OpensourceSingleton uniqueInstance;
private static OpensourceSingleton uniqueInstance;
    private OpensourceSingleton() {
    }
private OpensourceSingleton() {
}
    public static OpensourceSingleton getInstance() {
        if (uniqueInstance == null) {
            uniqueInstance = new OpensourceSingleton();
        }
        return uniqueInstance;
    }
public static OpensourceSingleton getInstance() {
if (uniqueInstance == null) {
uniqueInstance = new OpensourceSingleton();
}
return uniqueInstance;
}
}
```
@ -102,20 +102,20 @@ package org.opensource.demo.singleton;
public class ImprovedOpensourceSingleton {
    private volatile static ImprovedOpensourceSingleton uniqueInstance;
private volatile static ImprovedOpensourceSingleton uniqueInstance;
    private ImprovedOpensourceSingleton() {}
private ImprovedOpensourceSingleton() {}
    public static ImprovedOpensourceSingleton getInstance() {
        if (uniqueInstance == null) {
            synchronized (ImprovedOpensourceSingleton.class) {
                if (uniqueInstance == null) {
                    uniqueInstance = new ImprovedOpensourceSingleton();
                }
            }
        }
        return uniqueInstance;
    }
public static ImprovedOpensourceSingleton getInstance() {
if (uniqueInstance == null) {
synchronized (ImprovedOpensourceSingleton.class) {
if (uniqueInstance == null) {
uniqueInstance = new ImprovedOpensourceSingleton();
}
}
}
return uniqueInstance;
}
}
```
@ -141,20 +141,20 @@ package org.opensource.demo.factory;
public class OpensourceFactory {
    public OpensourceJVMServers getServerByVendor([String][18] name) {
        if(name.equals("Apache")) {
            return new Tomcat();
        }
        else if(name.equals("Eclipse")) {
            return new Jetty();
        }
        else if (name.equals("RedHat")) {
            return new WildFly();
        }
        else {
            return null;
        }
    }
public OpensourceJVMServers getServerByVendor(String name) {
if(name.equals("Apache")) {
return new Tomcat();
}
else if(name.equals("Eclipse")) {
return new Jetty();
}
else if (name.equals("RedHat")) {
return new WildFly();
}
else {
return null;
}
}
}
```
@ -164,9 +164,9 @@ public class OpensourceFactory {
package org.opensource.demo.factory;
public interface OpensourceJVMServers {
    public void startServer();
    public void stopServer();
    public [String][18] getName();
public void startServer();
public void stopServer();
public String getName();
}
```
@ -176,17 +176,17 @@ public interface OpensourceJVMServers {
package org.opensource.demo.factory;
public class WildFly implements OpensourceJVMServers {
    public void startServer() {
        [System][19].out.println("Starting WildFly Server...");
    }
public void startServer() {
System.out.println("Starting WildFly Server...");
}
    public void stopServer() {
        [System][19].out.println("Shutting Down WildFly Server...");
    }
public void stopServer() {
System.out.println("Shutting Down WildFly Server...");
}
    public [String][18] getName() {
        return "WildFly";
    }
public String getName() {
return "WildFly";
}
}
```
@ -209,9 +209,9 @@ package org.opensource.demo.observer;
public interface Topic {
    public void addObserver([Observer][22] observer);
    public void deleteObserver([Observer][22] observer);
    public void notifyObservers();
public void addObserver(Observer observer);
public void deleteObserver(Observer observer);
public void notifyObservers();
}
```
@ -226,39 +226,39 @@ import java.util.List;
import java.util.ArrayList;
public class Conference implements Topic {
    private List<Observer> listObservers;
    private int totalAttendees;
    private int totalSpeakers;
    private [String][18] nameEvent;
private List<Observer> listObservers;
private int totalAttendees;
private int totalSpeakers;
private String nameEvent;
    public Conference() {
        listObservers = new ArrayList&lt;Observer&gt;();
    }
public Conference() {
listObservers = new ArrayList<Observer>();
}
    public void addObserver([Observer][22] observer) {
        listObservers.add(observer);
    }
public void addObserver(Observer observer) {
listObservers.add(observer);
}
    public void deleteObserver([Observer][22] observer) {
        int i = listObservers.indexOf(observer);
        if (i &gt;= 0) {
            listObservers.remove(i);
        }
    }
public void deleteObserver(Observer observer) {
int i = listObservers.indexOf(observer);
if (i >= 0) {
listObservers.remove(i);
}
}
    public void notifyObservers() {
        for (int i=0, nObservers = listObservers.size(); i &lt; nObservers; ++ i) {
            [Observer][22] observer = listObservers.get(i);
            observer.update(totalAttendees,totalSpeakers,nameEvent);
        }
    }
public void notifyObservers() {
for (int i=0, nObservers = listObservers.size(); i < nObservers; ++ i) {
Observer observer = listObservers.get(i);
observer.update(totalAttendees,totalSpeakers,nameEvent);
}
}
    public void setConferenceDetails(int totalAttendees, int totalSpeakers, [String][18] nameEvent) {
        this.totalAttendees = totalAttendees;
        this.totalSpeakers = totalSpeakers;
        this.nameEvent = nameEvent;
        notifyObservers();
    }
public void setConferenceDetails(int totalAttendees, int totalSpeakers, String nameEvent) {
this.totalAttendees = totalAttendees;
this.totalSpeakers = totalSpeakers;
this.nameEvent = nameEvent;
notifyObservers();
}
}
```
@ -269,8 +269,8 @@ public class Conference implements Topic {
```
package org.opensource.demo.observer;
public interface [Observer][22] {
    public void update(int totalAttendees, int totalSpeakers, [String][18] nameEvent);
public interface Observer {
public void update(int totalAttendees, int totalSpeakers, String nameEvent);
}
```
@ -281,27 +281,27 @@ public interface [Observer][22] {
```
package org.opensource.demo.observer;
public class MonitorConferenceAttendees implements [Observer][22] {
    private int totalAttendees;
    private int totalSpeakers;
    private [String][18] nameEvent;
    private Topic topic;
public class MonitorConferenceAttendees implements Observer {
private int totalAttendees;
private int totalSpeakers;
private String nameEvent;
private Topic topic;
    public MonitorConferenceAttendees(Topic topic) {
        this.topic = topic;
        topic.addObserver(this);
    }
public MonitorConferenceAttendees(Topic topic) {
this.topic = topic;
topic.addObserver(this);
}
    public void update(int totalAttendees, int totalSpeakers, [String][18] nameEvent) {
        this.totalAttendees = totalAttendees;
        this.totalSpeakers = totalSpeakers;
        this.nameEvent = nameEvent;
        printConferenceInfo();
    }
public void update(int totalAttendees, int totalSpeakers, String nameEvent) {
this.totalAttendees = totalAttendees;
this.totalSpeakers = totalSpeakers;
this.nameEvent = nameEvent;
printConferenceInfo();
}
    public void printConferenceInfo() {
        [System][19].out.println(this.nameEvent + " has " + totalSpeakers + " speakers and " + totalAttendees + " attendees");
    }
public void printConferenceInfo() {
System.out.println(this.nameEvent + " has " + totalSpeakers + " speakers and " + totalAttendees + " attendees");
}
}
```