Add exception ServiceException.ServiceUnavailable.

Author: hrytsenko

src/main/java/com/github/hrytsenko/jsondata/springboot/error/ExceptionAdvices.java

@@ -98,6 +98,13 @@ public ErrorResponse onInternalError(ServiceException.InternalError exception) {
             return ErrorResponse.create(exception.getCode(), correlationSource.getCorrelation());
         }
 
+        @ExceptionHandler(ServiceException.ServiceUnavailable.class)
+        @ResponseStatus(code = HttpStatus.SERVICE_UNAVAILABLE)
+        public ErrorResponse onServiceUnavailable(ServiceException.ServiceUnavailable exception) {
+            log.error("Service unavailable", exception);
+            return ErrorResponse.create(exception.getCode(), correlationSource.getCorrelation());
+        }
+
     }
 
     @RestControllerAdvice

src/main/java/com/github/hrytsenko/jsondata/springboot/error/ServiceException.java

@@ -93,4 +93,16 @@ public InternalError(String code, Throwable cause) {
 
     }
 
+    public static class ServiceUnavailable extends ServiceException {
+
+        public ServiceUnavailable() {
+            this(null);
+        }
+
+        public ServiceUnavailable(Throwable cause) {
+            super("SERVICE_UNAVAILABLE", cause);
+        }
+
+    }
+
 }

src/test/java/com/github/hrytsenko/jsondata/springboot/error/ExceptionAdvicesTest.java

@@ -108,6 +108,18 @@ void serviceExceptionAdvice_onInternalError() {
         Assertions.assertEquals(expectedResponse, actualResponse);
     }
 
+    @Test
+    void serviceExceptionAdvice_onServiceUnavailable() {
+        ExceptionAdvices.ServiceExceptionAdvice advice = new ExceptionAdvices.ServiceExceptionAdvice(correlationSource);
+
+        ServiceException.ServiceUnavailable sourceException = new ServiceException.ServiceUnavailable();
+
+        ExceptionAdvices.ErrorResponse actualResponse = advice.onServiceUnavailable(sourceException);
+
+        ExceptionAdvices.ErrorResponse expectedResponse = ExceptionAdvices.ErrorResponse.create("SERVICE_UNAVAILABLE", CORRELATION);
+        Assertions.assertEquals(expectedResponse, actualResponse);
+    }
+
     @Test
     void validateExceptionAdvice_onProcessJson() {
         ExceptionAdvices.ValidateExceptionAdvice advice = new ExceptionAdvices.ValidateExceptionAdvice(correlationSource);