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solution to issue #602. Implemented multiton with enum, added example to app.java, a test for the enum, and commented my code

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anthonycampbell 2018-03-08 16:08:09 -08:00
parent 960d2ea6f7
commit ac57d67f45
1 changed files with 18 additions and 3 deletions
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21
multiton/src/main/java/com/iluwatar/multiton/App.java
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@ -31,9 +31,12 @@ import org.slf4j.LoggerFactory;
* pattern defines many globally accessible objects. The client asks for the correct instance from * pattern defines many globally accessible objects. The client asks for the correct instance from
* the Multiton by passing an enumeration as parameter. * the Multiton by passing an enumeration as parameter.
* <p> * <p>
* In this example {@link Nazgul} is the Multiton and we can ask single {@link Nazgul} from it using * There is more than one way to implement the multiton design pattern. In the first example
* {@link NazgulName}. The {@link Nazgul}s are statically initialized and stored in concurrent hash * {@link Nazgul} is the Multiton and we can ask single {@link Nazgul} from it using {@link NazgulName}.
* map. * The {@link Nazgul}s are statically initialized and stored in concurrent hash map.
* <p>
* In the enum implementation {@link NazgulEnum} is the multiton. It is static and mutable because
* of the way java supports enums.
* *
*/ */
public class App { public class App {
@ -46,6 +49,7 @@ public class App {
* @param args command line args * @param args command line args
*/ */
public static void main(String[] args) { public static void main(String[] args) {
// eagerly initialized multiton
LOGGER.info("KHAMUL={}", Nazgul.getInstance(NazgulName.KHAMUL)); LOGGER.info("KHAMUL={}", Nazgul.getInstance(NazgulName.KHAMUL));
LOGGER.info("MURAZOR={}", Nazgul.getInstance(NazgulName.MURAZOR)); LOGGER.info("MURAZOR={}", Nazgul.getInstance(NazgulName.MURAZOR));
LOGGER.info("DWAR={}", Nazgul.getInstance(NazgulName.DWAR)); LOGGER.info("DWAR={}", Nazgul.getInstance(NazgulName.DWAR));
@ -55,5 +59,16 @@ public class App {
LOGGER.info("ADUNAPHEL={}", Nazgul.getInstance(NazgulName.ADUNAPHEL)); LOGGER.info("ADUNAPHEL={}", Nazgul.getInstance(NazgulName.ADUNAPHEL));
LOGGER.info("REN={}", Nazgul.getInstance(NazgulName.REN)); LOGGER.info("REN={}", Nazgul.getInstance(NazgulName.REN));
LOGGER.info("UVATHA={}", Nazgul.getInstance(NazgulName.UVATHA)); LOGGER.info("UVATHA={}", Nazgul.getInstance(NazgulName.UVATHA));
// enum multiton
LOGGER.info("KHAMUL={}", NazgulEnum.KHAMUL);
LOGGER.info("MURAZOR={}", NazgulEnum.MURAZOR);
LOGGER.info("DWAR={}", NazgulEnum.DWAR);
LOGGER.info("JI_INDUR={}", NazgulEnum.JI_INDUR);
LOGGER.info("AKHORAHIL={}", NazgulEnum.AKHORAHIL);
LOGGER.info("HOARMURATH={}", NazgulEnum.HOARMURATH);
LOGGER.info("ADUNAPHEL={}", NazgulEnum.ADUNAPHEL);
LOGGER.info("REN={}", NazgulEnum.REN);
LOGGER.info("UVATHA={}", NazgulEnum.UVATHA);
} }
} }