gaspersic/java-design-patterns
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Reformat rest of the design patterns - Issue #224

Browse Source
This commit is contained in:
Ankur Kaushal
2015-11-01 21:29:13 -05:00
parent 449340bd2b
commit 306b1f3d31
337 changed files with 6744 additions and 6851 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
event-aggregator/src/main/java/com/iluwatar/event/aggregator/App.java
View File

@ -5,39 +5,40 @@ import java.util.List;
/**
*
* A system with lots of objects can lead to complexities when a client wants to subscribe
* to events. The client has to find and register for each object individually, if each
* object has multiple events then each event requires a separate subscription.
* A system with lots of objects can lead to complexities when a client wants to subscribe to
* events. The client has to find and register for each object individually, if each object has
* multiple events then each event requires a separate subscription.
* <p>
* An Event Aggregator acts as a single source of events for many objects. It registers
* for all the events of the many objects allowing clients to register with just the aggregator.
* An Event Aggregator acts as a single source of events for many objects. It registers for all the
* events of the many objects allowing clients to register with just the aggregator.
* <p>
* In the example {@link LordBaelish}, {@link LordVarys} and {@link Scout} deliver events to
* {@link KingsHand}. {@link KingsHand}, the event aggregator, then delivers the events
* to {@link KingJoffrey}.
* {@link KingsHand}. {@link KingsHand}, the event aggregator, then delivers the events to
* {@link KingJoffrey}.
*
*/
public class App {
/**
* Program entry point
* @param args command line args
*/
public static void main(String[] args) {
KingJoffrey kingJoffrey = new KingJoffrey();
KingsHand kingsHand = new KingsHand(kingJoffrey);
/**
* Program entry point
*
* @param args command line args
*/
public static void main(String[] args) {
List<EventEmitter> emitters = new ArrayList<>();
emitters.add(kingsHand);
emitters.add(new LordBaelish(kingsHand));
emitters.add(new LordVarys(kingsHand));
emitters.add(new Scout(kingsHand));
for (Weekday day: Weekday.values()) {
for (EventEmitter emitter: emitters) {
emitter.timePasses(day);
}
}
}
KingJoffrey kingJoffrey = new KingJoffrey();
KingsHand kingsHand = new KingsHand(kingJoffrey);
List<EventEmitter> emitters = new ArrayList<>();
emitters.add(kingsHand);
emitters.add(new LordBaelish(kingsHand));
emitters.add(new LordVarys(kingsHand));
emitters.add(new Scout(kingsHand));
for (Weekday day : Weekday.values()) {
for (EventEmitter emitter : emitters) {
emitter.timePasses(day);
}
}
}
}

23
event-aggregator/src/main/java/com/iluwatar/event/aggregator/Event.java
View File

@ -7,15 +7,16 @@ package com.iluwatar.event.aggregator;
*/
public enum Event {
STARK_SIGHTED("Stark sighted"), WARSHIPS_APPROACHING("Warships approaching"), TRAITOR_DETECTED("Traitor detected");
private String description;
Event(String description) {
this.description = description;
}
public String toString() {
return description;
}
STARK_SIGHTED("Stark sighted"), WARSHIPS_APPROACHING("Warships approaching"), TRAITOR_DETECTED(
"Traitor detected");
private String description;
Event(String description) {
this.description = description;
}
public String toString() {
return description;
}
}

40
event-aggregator/src/main/java/com/iluwatar/event/aggregator/EventEmitter.java
View File

@ -10,26 +10,26 @@ import java.util.List;
*/
public abstract class EventEmitter {
private List<EventObserver> observers;
private List<EventObserver> observers;
public EventEmitter() {
observers = new LinkedList<>();
}
public EventEmitter() {
observers = new LinkedList<>();
}
public EventEmitter(EventObserver obs) {
this();
registerObserver(obs);
}
public void registerObserver(EventObserver obs) {
observers.add(obs);
}
protected void notifyObservers(Event e) {
for (EventObserver obs: observers) {
obs.onEvent(e);
}
}
public abstract void timePasses(Weekday day);
public EventEmitter(EventObserver obs) {
this();
registerObserver(obs);
}
public void registerObserver(EventObserver obs) {
observers.add(obs);
}
protected void notifyObservers(Event e) {
for (EventObserver obs : observers) {
obs.onEvent(e);
}
}
public abstract void timePasses(Weekday day);
}

4
event-aggregator/src/main/java/com/iluwatar/event/aggregator/EventObserver.java
View File

@ -6,7 +6,7 @@ package com.iluwatar.event.aggregator;
*
*/
public interface EventObserver {
void onEvent(Event e);
void onEvent(Event e);
}

8
event-aggregator/src/main/java/com/iluwatar/event/aggregator/KingJoffrey.java
View File

@ -7,8 +7,8 @@ package com.iluwatar.event.aggregator;
*/
public class KingJoffrey implements EventObserver {
@Override
public void onEvent(Event e) {
System.out.println("Received event from the King's Hand: " + e.toString());
}
@Override
public void onEvent(Event e) {
System.out.println("Received event from the King's Hand: " + e.toString());
}
}

33
event-aggregator/src/main/java/com/iluwatar/event/aggregator/KingsHand.java
View File

@ -2,27 +2,26 @@ package com.iluwatar.event.aggregator;
/**
*
* KingsHand observes events from multiple sources and delivers them
* to listeners.
* KingsHand observes events from multiple sources and delivers them to listeners.
*
*/
public class KingsHand extends EventEmitter implements EventObserver {
public KingsHand() {
super();
}
public KingsHand() {
super();
}
public KingsHand(EventObserver obs) {
super(obs);
}
@Override
public void onEvent(Event e) {
notifyObservers(e);
}
public KingsHand(EventObserver obs) {
super(obs);
}
@Override
public void timePasses(Weekday day) {
// NOP
}
@Override
public void onEvent(Event e) {
notifyObservers(e);
}
@Override
public void timePasses(Weekday day) {
// NOP
}
}

28
event-aggregator/src/main/java/com/iluwatar/event/aggregator/LordBaelish.java
View File

@ -6,19 +6,19 @@ package com.iluwatar.event.aggregator;
*
*/
public class LordBaelish extends EventEmitter {
public LordBaelish() {
super();
}
public LordBaelish(EventObserver obs) {
super(obs);
}
@Override
public void timePasses(Weekday day) {
if (day.equals(Weekday.FRIDAY)) {
notifyObservers(Event.STARK_SIGHTED);
}
}
public LordBaelish() {
super();
}
public LordBaelish(EventObserver obs) {
super(obs);
}
@Override
public void timePasses(Weekday day) {
if (day.equals(Weekday.FRIDAY)) {
notifyObservers(Event.STARK_SIGHTED);
}
}
}

28
event-aggregator/src/main/java/com/iluwatar/event/aggregator/LordVarys.java
View File

@ -6,19 +6,19 @@ package com.iluwatar.event.aggregator;
*
*/
public class LordVarys extends EventEmitter {
public LordVarys() {
super();
}
public LordVarys(EventObserver obs) {
super(obs);
}
@Override
public void timePasses(Weekday day) {
if (day.equals(Weekday.SATURDAY)) {
notifyObservers(Event.TRAITOR_DETECTED);
}
}
public LordVarys() {
super();
}
public LordVarys(EventObserver obs) {
super(obs);
}
@Override
public void timePasses(Weekday day) {
if (day.equals(Weekday.SATURDAY)) {
notifyObservers(Event.TRAITOR_DETECTED);
}
}
}

28
event-aggregator/src/main/java/com/iluwatar/event/aggregator/Scout.java
View File

@ -6,19 +6,19 @@ package com.iluwatar.event.aggregator;
*
*/
public class Scout extends EventEmitter {
public Scout() {
super();
}
public Scout(EventObserver obs) {
super(obs);
}
@Override
public void timePasses(Weekday day) {
if (day.equals(Weekday.TUESDAY)) {
notifyObservers(Event.WARSHIPS_APPROACHING);
}
}
public Scout() {
super();
}
public Scout(EventObserver obs) {
super(obs);
}
@Override
public void timePasses(Weekday day) {
if (day.equals(Weekday.TUESDAY)) {
notifyObservers(Event.WARSHIPS_APPROACHING);
}
}
}

23
event-aggregator/src/main/java/com/iluwatar/event/aggregator/Weekday.java
View File

@ -6,16 +6,17 @@ package com.iluwatar.event.aggregator;
*
*/
public enum Weekday {
MONDAY("Monday"), TUESDAY("Tuesday"), WEDNESDAY("Wednesday"), THURSDAY("Thursday"), FRIDAY("Friday"), SATURDAY("Saturday"), SUNDAY("Sunday");
private String description;
Weekday(String description) {
this.description = description;
}
public String toString() {
return description;
}
MONDAY("Monday"), TUESDAY("Tuesday"), WEDNESDAY("Wednesday"), THURSDAY("Thursday"), FRIDAY(
"Friday"), SATURDAY("Saturday"), SUNDAY("Sunday");
private String description;
Weekday(String description) {
this.description = description;
}
public String toString() {
return description;
}
}

11
event-aggregator/src/test/java/com/iluwatar/event/aggregator/AppTest.java
View File

@ -1,4 +1,5 @@
package com.iluwatar.event.aggregator;
import org.junit.Test;
import com.iluwatar.event.aggregator.App;
@ -10,9 +11,9 @@ import com.iluwatar.event.aggregator.App;
*/
public class AppTest {
@Test
public void test() {
String[] args = {};
App.main(args);
}
@Test
public void test() {
String[] args = {};
App.main(args);
}
}