User Guide: SDKs > Android SDK > Invoking an Object Service > OnlineObjectService Class

OnlineObjectService Class

OnlineObjectService Class provides methods that perform operations acting on the Volt MX Foundry endpoint, including basic CRUD. An instance of OnlineObjectService is returned by the getObjectService Method.

Methods

The following methods are used by the OnlineObjectService class and its instantiations.

Create

Creates an object in the Volt MX Foundry endpoint.

Syntax

 create(HashMap<String,String> headers,HashMap<String,String> queryParams,ObjectServiceCallback callback)

Return Type

None

Parameters

Input Parameter	Type	Description	Required
dataObject	DataObject	An instance of the DataObject class that contains details about the object and its data	Yes
headers	HashMap	Key/value pairs of httpHeaders that are sent along with the network call.	Optional
queryParams	HashMap	Key/ value pairs of query parameters that are appended to the URL while making a network call	Optional
objectServiceCallback	ObjectServiceCallback	Interface with onSuccess and onFailure methods onSuccess: Function invoked when the operation succeeds with the primary key of the created object. onFailure: Function invoked when the operation fails with cause of failure.	Yes

Code

 ObjectService objSvc = voltmxClient.getObjectService("<objectservicename>");
DataObject dataObject = new DataObject("product");
JSONObject bodyParams = new JSONObject();
bodyParams.put("name", "tv");
dataObject.setRecord(bodyParams);

try {
    objSvc.create(dataObject, new HashMap < String, String > (), new HashMap < String, String > (),
        new ObjectServiceCallback() {
            @Override
            public void onSuccess(JSONObject response) throws VoltMXException {
                voltmx.print("create success : " + response.toString());
            }

            @Override
            public void onFailure(ObjectServiceException objectServiceException) {
                voltmx.print("create failed : " + objectServiceException.getErrorMessage());
            }
        }
    );
} catch (Exception e) {
    voltmx.print("Exception while creating an object  : " + e.printStackTrace());

}

Update

Updates an object in the Volt MX Foundry endpoint.

Syntax

 update(DataObject dataObject,HashMap<String,String> headers,HashMap<String,String> queryParams,ObjectServiceCallback callback)

Parameters

Input Parameter	Type	Description	Required
dataObject	DataObject	An instance of the DataObject class that contains details about the object and its data	Yes
headers	HashMap	Key/value pairs of httpHeaders that are sent along with the network call.	Optional
queryParams	HashMap	Key/ value pairs of query parameters that are appended to the URL while making a network call	Optional
objectServiceCallback	ObjectServiceCallback	Interface with onSuccess and onFailure methods onSuccess: Function invoked when the operation succeeds with the primary key of the created object. onFailure: Function invoked when the operation fails with cause of failure.	Yes

Code

 ObjectService objSvc = voltmxClient.getObjectService("<objectservicename>");
DataObject dataObject = new DataObject("product");
JSONObject params = new JSONObject();
params.put("name", ”playstation”);
dataObject.setRecord(params);
try {
    objSvc.update(dataObject, new HashMap < String, String > (), new HashMap < String, String > (), new ObjectServiceCallback() {
        @verride
        public void onSuccess(final JSONObject object) {
            voltmx.print("update success : " + response.toString());
        }

        @Override
        public void onFailure(final ObjectServiceException objectServiceException) {
            voltmx.print("update failed : " + objectServiceException.getErrorMessage());
        }
    });
} catch (Exception e) {
    voltmx.print("Exception occurred while updating an object : " + e.printStackTrace());
}

Delete

Deletes an object in the Volt MX Foundry endpoint.

Syntax

 delete(DataObject dataObject,HashMap<String,String> headers,HashMap<String,String> queryParams,ObjectServiceCallback callback)

Parameters

Input Parameter	Type	Description	Required
dataObject	DataObject	An instance of the DataObject class that contains details about the object and its data	Yes
headers	HashMap	Key/ value pairs of httpHeaders that are sent along with the network call.	Optional
queryParams	HashMap	Key/ value pairs of query parameters that are appended to the URL while making a network call	Optional
objectServiceCallback	ObjectServiceCallback	Interface with onSuccess and onFailure methods onSuccess: Function invoked when the operation succeeds with the primary key of the created object. onFailure: Function invoked when the operation fails with cause of failure.	Yes

Code

 DataObject dataObject = new DataObject("product");
JSONObject jobject = new JSONObject();
jobject.put("id", 1);
dataObject.setRecord(jobject);
try {
    objSvc.delete(dataObject, new HashMap < String, String > (), new HashMap < String, String > (), new ObjectServiceCallback() {
            @Override
            public void onSuccess(JSONObject response) throws VoltMXException {
                voltmx.print("delete success : " + response.toString());
            }
            @Override
            public void onFailure(ObjectServiceException objectServiceException) {
                voltmx.print("delete failed" + objectServiceException.getErrorMessage());
            }
            );
    }

Fetch

Fetches an object from the server.

Syntax

 fetch(DataObject dataObject,HashMap<String,String> headers,HashMap<String,String> queryParams,ObjectServiceCallback callback)

Parameters

Input Parameter	Type	Description	Required
dataObject	DataObject	An instance of the DataObject class that contains details about the object and its data	Yes
headers	HashMap	Key/ value pairs of httpHeaders that are sent along with the network call.	Optional
queryParams	HashMap	Key/ value pairs of query parameters that are appended to the URL while making a network call.	Optional
objectServiceCallback	ObjectServiceCallback	Interface with onSuccess and onFailure methods onSuccess: Function invoked when the operation succeeds with the primary key of the created object. onFailure: Function invoked when the operation fails with cause of failure.	Yes

Code

DataObject dataObject = new DataObject("product");
dataObject.setODataUrl("$filter= " + "id" + "eq" + "1");
try {
    objectService.fetch(dataObject, new HashMap < String, String > (), new HashMap < String, String > (), new ObjectServiceCallback() {
        @Override
        public void onSuccess(JSONObject response) throws VoltMXException {
            voltmx.print("fetch success : " + response.toString());
        }
        @Override
        public void onFailure(ObjectServiceException objectServiceException) {
            voltmx.print("fetch failed" + objectServiceException.getErrorMessage());
        }
    });
} catch (Exception e) {
    voltmx.print("exception occurred while deleting an object " + e.getMessage());
}

getMetaDataofAllObjects

Gets the metadata associated with the objects that are defined in the service from the server.

Syntax

 getMetadataOfAllObjects(boolean getFromServer,String objectName,HashMap<String,String> headers,HashMap<String,String> queryParams,ObjectServiceCallback callback)

Parameters

Input Parameter	Type	Description	Required
getFromServer	Boolean	Flag that retrieves the metadata of the object from the server or local store. True - from server False - from local store	Yes
objectName	String	Name of the object	Yes
headers	HashMap	Key/ value pairs of httpHeaders that are sent along with the network call.	Optional
queryParams	HashMap	Key/ value pairs of query parameters that are appended to the URL while making a network call.	Optional
objectServiceCallback	ObjectServiceCallback	Interface with onSuccess and onFailure methods onSuccess: Function invoked when the operation succeeds with the primary key of the created object. onFailure: Function invoked when the operation fails with cause of failure.	Yes

Code

 try {
    objectService.getMetadataOfAllObjects(true, dataObject.getObjectName(), null, null, new ObjectServiceCallback() {
            @Override
            public void onSuccess(final JSONObject object) {
                voltmx.print("get meta data of all objects success");
            }
        }
        @Override
        public void onFailure(final ObjectServiceException objectServiceException) {
            voltmx.print("get meta data of all objects failed" + objectServiceException.getErrorMessage());
        }
    }
});

getMetaDataofObject

Gets the metadata associated with an object that is defined in the service from the server or local store.

Syntax

 getMetadataOfObject(boolean getFromServer,String objectName,HashMap<String,String> headers,HashMap<String,String> queryParams, ObjectServiceCallback callback)

Parameters

Input Parameter	Type	Description	Required
getFromServer	Boolean	Flag that retrieves the metadata of the object from the server or local store. True from server False - from local store	Yes
objectName	String	Name of the object	Yes
headers	HashMap	Key/ value pairs of httpHeaders that are sent along with the network call.	Optional
queryParams	HashMap	Key/ value pairs of query parameters that are appended to the URL while making a network call.	Optional
objectServiceCallback	ObjectServiceCallback	Interface with onSuccess and onFailure methods onSuccess: Function invoked when the operation succeeds with the primary key of the created object. onFailure: Function invoked when the operation fails with cause of failure.	Yes

Code

 try {
    objectService.getMetadataOfObject(true, dataObject.getObjectName(), null, null, new ObjectServiceCallback() {
        @Override
        public void onSuccess(final JSONObject object) {
            voltmx.print("get meta data of object success");
        }
        @Override
        public void onFailure(final ObjectServiceException objectServiceException) {
            voltmx.print("get meta data of object failed" + objectServiceException.getErrorMessage());
        }
    });
} catch (VoltMXException e) {
    e.printStackTrace();
}