Resolve "Make person cache timeout configurable"

Closes #74 (closed)

src/main/java/nl/tudelft/submit/cache/PersonCacheManager.java

@@ -26,6 +26,7 @@ import nl.tudelft.labracore.api.dto.PersonSummaryDTO;
 
 import org.modelmapper.ModelMapper;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.env.Environment;
 import org.springframework.stereotype.Component;
 import org.springframework.web.context.annotation.ApplicationScope;
 
@@ -34,18 +35,20 @@ import org.springframework.web.context.annotation.ApplicationScope;
 public class PersonCacheManager extends TimedCacheManager<Long, PersonSummaryDTO> {
 
 	private Map<String, Long> usernameCache = new ConcurrentHashMap<>();
+	private static long timeout;
 
-	@Autowired
 	private ModelMapper mapper;
 
-	@Autowired
 	private PersonControllerApi api;
 
 	/**
 	 * Creates a new person cache by setting the timeout on its timed cache implementation to 5 minutes.
 	 */
-	public PersonCacheManager() {
-		super(5 * 60 * 1000L);
+	@Autowired
+	public PersonCacheManager(ModelMapper mapper, PersonControllerApi api, Environment env) {
+		super(Long.parseLong(env.getProperty("submit.cache.person-timeout")) * 1000L);
+		this.mapper = mapper;
+		this.api = api;
 	}
 
 	public PersonSummaryDTO get(String username) {