added controller to getnextId

Author: gopalbala

src/main/java/com/gb/didgen/IdGeneratorController.java

@@ -0,0 +1,19 @@
+package com.gb.didgen;
+
+import com.gb.didgen.exception.ClockMovedBackException;
+import com.gb.didgen.exception.NodeIdOutOfBoundException;
+import com.gb.didgen.service.IdGenerator;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController("/id")
+public class IdGeneratorController {
+
+    private IdGenerator idGenerator;
+
+    @GetMapping(produces = {"application/JSON"})
+    public ResponseEntity<?> getNextId() throws NodeIdOutOfBoundException, ClockMovedBackException {
+        return ResponseEntity.ok(idGenerator.generateId());
+    }
+}