Removed type target definition

src/main/java/de/thm/arsnova/web/CacheControl.java

@@ -5,7 +5,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Target({ ElementType.TYPE, ElementType.METHOD })
+@Target(ElementType.METHOD)
 @Retention(RetentionPolicy.RUNTIME)
 public @interface CacheControl {
 	enum Policy {

src/main/java/de/thm/arsnova/web/DeprecatedApi.java

+package de.thm.arsnova.web;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface DeprecatedApi {
+}

src/main/java/de/thm/arsnova/web/DeprecatedApiInterceptorHandler.java

+package de.thm.arsnova.web;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.springframework.stereotype.Component;
+import org.springframework.web.method.HandlerMethod;
+import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
+
+@Component
+public class DeprecatedApiInterceptorHandler extends HandlerInterceptorAdapter {
+
+	@Override
+	public boolean preHandle(
+			HttpServletRequest request,
+			HttpServletResponse response,
+			Object handler) throws Exception {
+
+		if (getDeprecatedApiAnnotation(request, response, handler) != null) {
+			response.addHeader("X-Deprecated-Api", "1");
+		}
+
+		return super.preHandle(request, response, handler);
+	}
+
+	private DeprecatedApi getDeprecatedApiAnnotation(
+			HttpServletRequest request,
+			HttpServletResponse response,
+			Object handler
+			) {
+		if (handler == null || !(handler instanceof HandlerMethod)) {
+			return null;
+		}
+
+		final HandlerMethod handlerMethod = (HandlerMethod) handler;
+		return handlerMethod.getMethodAnnotation(DeprecatedApi.class);
+	}
+}

src/test/java/de/thm/arsnova/controller/StatisticsControllerTest.java

@@ -47,6 +47,13 @@ public class StatisticsControllerTest {
 		.andExpect(content().string("0"));
 	}
 
+	@Test
+	public final void testShouldSendXDeprecatedApiForGetCurrentOnlineUsers() throws Exception {
+		mockMvc.perform(get("/statistics/activeusercount"))
+		.andExpect(status().isOk())
+		.andExpect(header().string(AbstractController.X_DEPRECATED_API,"1"));
+	}
+
 	@Test
 	public final void testShouldGetSessionCount() throws Exception {
 		mockMvc.perform(get("/statistics/sessioncount"))
@@ -54,6 +61,13 @@ public class StatisticsControllerTest {
 		.andExpect(content().string("3"));
 	}
 
+	@Test
+	public final void testShouldSendXDeprecatedApiForGetSessionCount() throws Exception {
+		mockMvc.perform(get("/statistics/sessioncount"))
+		.andExpect(status().isOk())
+		.andExpect(header().string(AbstractController.X_DEPRECATED_API,"1"));
+	}
+
 	@Test
 	public final void testShouldGetStatistics() throws Exception {
 		mockMvc.perform(get("/statistics"))