feat: add callback configuration to restapi

application/source/data/datasource/server/restapi.mjs

@@ -49,6 +49,7 @@ class RestAPI extends Server {
      * @property {Object} write.init={} An options object containing any custom settings that you want to apply to the request. The parameters are identical to those of the {@link https://developer.mozilla.org/en-US/docs/Web/API/Request/Request|Request constructor}
      * @property {string} write.init.method=POST
      * @property {Object} write.init.headers Object containing any custom headers that you want to apply to the request.
+     * @property {string} write.responseCallback Callback function to be executed after the request has been completed.
      * @property {string} write.acceptedStatus=[200,201]
      * @property {string} write.url URL
      * @property {Object} write.mapping the mapping is applied before writing.
@@ -74,6 +75,7 @@ class RestAPI extends Server {
                 init: {
                     method: "POST",
                 },
+                responseCallback: undefined,
                 acceptedStatus: [200, 201],
                 url: undefined,
                 mapping: {
@@ -92,6 +94,7 @@ class RestAPI extends Server {
                 init: {
                     method: "GET",
                 },
+                responseCallback: undefined,
                 acceptedStatus: [200],
                 url: undefined,
                 mapping: {
@@ -115,9 +118,12 @@ class RestAPI extends Server {
         if (!isObject(init)) init = {};
         if (!init["method"]) init["method"] = "GET";
 
-        return fetchData.call(this, "read", (obj) => {
+        let callback = self.getOption("read.responseCallback");
+        if(!callback) callback = (obj) => {
             self.set(self.transformServerPayload.call(self, obj));
-        });
+        };
+        
+        return fetchData.call(this, "read", callback);
     }
 
     /**
@@ -139,7 +145,8 @@ class RestAPI extends Server {
         let obj = self.prepareServerPayload(self.get());
         init["body"] = JSON.stringify(obj);
 
-        return fetchData.call(this, init, "write");
+        let callback = self.getOption("write.responseCallback");
+        return fetchData.call(this, init, "write", callback);
     }
 
     /**