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Merge pull requestTheAlgorithms#1178 from ali4j/Development

Adding Proxy Design Pattern

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Lines changed: 31 additions & 0 deletions

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	`1`	`+packagecom.designpatterns.structural.proxy.president;`
	`2`	`+`
	`3`	`+importcom.designpatterns.creational.singleton.Singleton;`
	`4`	`+`
	`5`	`+/**`
	`6`	`+ * This is a class which is gonna be proxied by PresidentSecretary.`
	`7`	`+ * Whenever any citizen decides to contact the President, they have to talk to the Secretary.`
	`8`	`+ */`
	`9`	`+publicclassPresident {`
	`10`	`+`
	`11`	`+privatevolatilestaticPresidentinstance =null;`
	`12`	`+`
	`13`	`+privatePresident() {}`
	`14`	`+`
	`15`	`+staticPresidentgetInstance() {`
	`16`	`+if (instance ==null) {`
	`17`	`+synchronized (Singleton.class) {`
	`18`	`+if (instance ==null) {`
	`19`	`+instance =newPresident();`
	`20`	`+ }`
	`21`	`+ }`
	`22`	`+ }`
	`23`	`+returninstance;`
	`24`	`+ }`
	`25`	`+`
	`26`	`+`
	`27`	`+`
	`28`	`+voidtalkToThePresident(Stringmessage){`
	`29`	`+System.out.println("President: I have received the message:" +message);`
	`30`	`+ }`
	`31`	`+}`

Lines changed: 25 additions & 0 deletions

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	`1`	`+packagecom.designpatterns.structural.proxy.president;`
	`2`	`+`
	`3`	`+publicclassPresidentSecretary {`
	`4`	`+`
	`5`	`+privatePresidentpresident;`
	`6`	`+`
	`7`	`+publicPresidentSecretary() {`
	`8`	`+this.president =President.getInstance();`
	`9`	`+ }`
	`10`	`+`
	`11`	`+publicvoidleaveValidMessageForPresident(Stringmessage){`
	`12`	`+`
	`13`	`+if(!isMessageValid(message))`
	`14`	`+thrownewRuntimeException("invalid message");`
	`15`	`+`
	`16`	`+System.out.println("Secretary: message is being sent to the President...");`
	`17`	`+president.talkToThePresident(message);`
	`18`	`+System.out.println("Secretary: message is sent to the President.");`
	`19`	`+`
	`20`	`+ }`
	`21`	`+`
	`22`	`+privatebooleanisMessageValid(Stringmessage) {`
	`23`	`+returnmessage !=null && !message.isEmpty() &&message.length() >=10 &&message.length() <=100;`
	`24`	`+ }`
	`25`	`+}`

Lines changed: 39 additions & 0 deletions

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	`1`	`+packagecom.designpatterns.structural.proxy;`
	`2`	`+`
	`3`	`+importcom.designpatterns.structural.proxy.president.PresidentSecretary;`
	`4`	`+importorg.junit.jupiter.api.Assertions;`
	`5`	`+importorg.junit.jupiter.api.Test;`
	`6`	`+`
	`7`	`+publicclassCitizen {`
	`8`	`+`
	`9`	`+`
	`10`	`+privatePresidentSecretarypresidentSecretary =newPresidentSecretary();`
	`11`	`+`
	`12`	`+@Test`
	`13`	`+publicvoidtalkToPresident_secretaryShouldRejectTooShortMessage() {`
	`14`	`+Stringmessage ="Hi there.";`
	`15`	`+`
	`16`	`+Assertions.assertThrows(RuntimeException.class, () -> {`
	`17`	`+presidentSecretary.leaveValidMessageForPresident(message);`
	`18`	`+ });`
	`19`	`+ }`
	`20`	`+`
	`21`	`+@Test`
	`22`	`+publicvoidtalkToPresident_secretaryShouldRejectTooLongMessage() {`
	`23`	`+Stringmessage ="Hi there. this is a message about some personal issue which I have decided to share with Mr.President.";`
	`24`	`+`
	`25`	`+Assertions.assertThrows(RuntimeException.class, () -> {`
	`26`	`+presidentSecretary.leaveValidMessageForPresident(message);`
	`27`	`+ });`
	`28`	`+ }`
	`29`	`+`
	`30`	`+@Test`
	`31`	`+publicvoidtalkToPresident_secretaryShouldAcceptTheMessage() {`
	`32`	`+Stringmessage ="Hello Mr.President";`
	`33`	`+`
	`34`	`+presidentSecretary.leaveValidMessageForPresident(message);`
	`35`	`+Assertions.assertTrue(true);`
	`36`	`+ }`
	`37`	`+`
	`38`	`+`
	`39`	`+}`

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