Annotation based ServiceLocatorFactoryBean?
Spring Java Configuration ref guide @Configuration
Interface Parser.class
public interface Parser {
void parse(String str);
}
Implementation for above interface.
JsonParser.java
public class JsonParser implements Parser {
@Override
public void parse(String str) {
System.out.println("JsonParser.parse::" + str);
}
}
XMLParser.java
public class XMLParser implements Parser{
@Override
public void parse(String str) {
System.out.println("XMLParser.parse :: " + str);
}
}
ParserFactory.java actual Factory interface.
public interface ParserFactory {
public Parser getParser(ParserType parserType);
}
ParseType.java enum to specify parsing types(avoid typos and safe)
public enum ParserType {
JSON("jsonParser"), XML("xmlParser");
private final String value;
ParserType(String input) {
this.value = input;
}
public String getValue() {
return this.value;
}
@Override
public String toString() {
return this.value;
}
}
ParseService.java , where Business logic implemeted.
@Service
public class ParserService {
@Autowired
private ParserFactory parserFactory;
public void doParse(String parseString, ParserType parseType) {
Parser parser = parserFactory.getParser(parseType);
System.out.println("ParserService.doParse.." + parser);
parser.parse(parseString);
}
}
Finally AppConfig.java Spring java configuration class, where all of my beans registered as container managed beans.
@Configuration
@ComponentScan(basePackages = {"<Your Package Name>"})
public class AppConfig {
@Bean
public FactoryBean serviceLocatorFactoryBean() {
ServiceLocatorFactoryBean factoryBean = new ServiceLocatorFactoryBean();
factoryBean.setServiceLocatorInterface(ParserFactory.class);
return factoryBean;
}
@Bean(name = "jsonParser")
@Scope(scopeName = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public JsonParser jsonParser() {
return new JsonParser();
}
@Bean(name = "xmlParser")
@Scope(scopeName = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public XMLParser xmlParser() {
return new XMLParser();
}
}
Now autowire ParserService
bean in either controller or test classs, and invoke parese(String, ParseType)
method to test.
Here is my test.
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = AppConfig.class)
public class ServiceLocatorFactoryExample {
@Autowired
private ParserService parserService;
@Test
public void testParserFactory() {
parserService.doParse("Srilekha", ParserType.JSON);
parserService.doParse("Srilekha", ParserType.XML);
}
}
Look this complete example: Serevice Locator factory
It helps me to understand how it works using spring boot.