Rename headers

Author: segabriel

services-api/src/main/java/io/scalecube/services/api/ServiceMessage.java

@@ -20,13 +20,13 @@ public final class ServiceMessage {
    * It is not supposed to be used by application directly and it is subject to changes in future
    * releases.
    */
-  public static final String HEADER_DATA_TYPE = "_type";
+  public static final String HEADER_DATA_TYPE = "type";
 
   /** Data format header. */
-  public static final String HEADER_DATA_FORMAT = "_data_format";
+  public static final String HEADER_DATA_FORMAT = "dataFormat";
 
   /** Error type header. */
-  public static final String ERROR_TYPE = "_error_type";
+  public static final String HEADER_ERROR_TYPE = "errorType";
 
   private Map<String, String> headers = new HashMap<>(1);
   private Object data;
@@ -63,7 +63,7 @@ public static ServiceMessage error(
       String qualifier, int errorType, int errorCode, String errorMessage) {
     return ServiceMessage.builder()
         .qualifier(qualifier)
-        .header(ERROR_TYPE, String.valueOf(errorType))
+        .header(HEADER_ERROR_TYPE, String.valueOf(errorType))
         .data(new ErrorData(errorCode, errorMessage))
         .build();
   }
@@ -162,7 +162,7 @@ public boolean hasData(Class<?> dataClass) {
    * @return <code>true</code> if error, otherwise <code>false</code>.
    */
   public boolean isError() {
-    return headers.containsKey(ERROR_TYPE);
+    return headers.containsKey(HEADER_ERROR_TYPE);
   }
 
   /**
@@ -171,7 +171,7 @@ public boolean isError() {
    * @return error type.
    */
   public int errorType() {
-    String errorType = headers.get(ERROR_TYPE);
+    String errorType = headers.get(HEADER_ERROR_TYPE);
     if (errorType == null) {
       return -1;
     }