\<objectService>.startSync

The \<objectService>.startSync API performs sync for all objects under the object service.

Note:
If sync is performed in an upload cache enabled scenario, cached requests that are timed out in the previous upload session are uploaded before the latest changes.
The client does not handle partial records and expects the server to send the entire record. Full record with all the columns are expected in both upload and download responses. If the backend does not return the full record, use post processor to copy the missing columns from the request as demonstrated here.

Volt MX Iris (JavaScript)

Signature

VMXObjSvc.startSync(syncOptions, successCallback, failureCallback, progressCallback)

Parameters

Parameter	Type	Description	Required
syncOptions	JSON	The user can provide options to customize sync behavior. For example, Filters, downloadBatchSize etc, Refer Sync Options for supported options. Refer Offline Objects Getting Started guide for more details.	Yes
successCallback	Function	The function is invoked on successful sync with response as an argument. Response object includes sync status code, sync stats etc based on the supplied sync options.	Yes
failureCallback	Function	The function is invoked on an error with the cause of failure as an argument upon Sync failure.	Yes
progressCallback	Function	The function is invoked on different sync phases along with phase specific data such as the number of records downloaded etc. Refer Offline Objects Getting Started guide for more details about sync progress events. *Note:* Not applicable for Mobile Web and Desktop Web channels. If app developer passes this parameter in the options, it will be ignored.	No

Sync Options

Options	Type	Descriptions	Required
filter	JSON	The filter is a valid OData filter string that allows downloading specific records based on the supplied criteria. When the sync is performed at object service-level, filters are supplied for all objects/entities of that service for which filter criteria needs to be applied as a key-value pair (object name, OData filter string) as shown in the sample code. All records are downloaded for those objects with no or invalid OData filter.	No
downloadBatchSize	Number/String	downloadBatchSize option defines record based batching in downloads. Care should be taken to provide appropriate batch size (number of records) based on backend’s ability to support the same. downloadBatchsize is 500 (records) by default .	No
uploadBatchSize	Number/String	uploadBatchSize option defines record based batching in uploads. uploadBatchSize is 50 (records), by default. Default batch size is assumed if the supplied value is <=0.	No
getSyncStats	String	The getSyncStats option is used to get sync stats information through sync success callback. This option takes two values true or false. Sync stats information is not returned to the user if the getSyncStats option is not supplied or set to false or an invalid value.	No
syncType	String	downloadOnly will download the changes from the server. Change on the client side will not be pushed to the sever.uploadOnly will upload the changes from the client device to the server. Changes on the server will not be downloaded.fullSync will perform both upload and download from the client device to the server and vice-versa. *Note:* Sync will move to the error state, if any other value is provided other than the above mentioned values.If sync type is not selected, full sync is performed by default.	No
uploadRequestQueryParams	JSON	The uploadRequestQueryParams option is used to pass the query parameters in upload network requests.	No
downloadRequestQueryParams	JSON	The downloadRequestQueryParams is used to pass the query parameters in download network requests.	No
downloadReconciliationRequired	Boolean	This parameter specifies if download reconciliation is required or not. Download reconciliation is used to compare primary keys present in backend with application database primary keys for an object. In scenarios where there are no pending edits, it is advisable to perform startSync by setting downloadReconciliationRequired to false (as in the case of initial sync). downloadReconciliationRequired is set to true, by default.	No
preserveBatchContext	Boolean	preserveBatchContext specifies whether to preserve the batchContext of last successful download batch. If batchContext is preserved, the successive download call resumes from the last successful batch, else it starts from the first batch again. Set the option to True, to resume the download from last successful batch. Set the option to False, to start downloading from the first batch. preserveBatchContext is set to false, by default. *Note:* This parameter is not supported for Windows, Mobile Web, and Desktop Web channels.	No

Return Type

void

Example

function successCallback(object) {
    //Handle sync success response.
}

function failureCallback(error) {
    //Handle sync failure response.
}

function progressCallback(object) {
    //Handle sync progress response.
}
try {

    var syncObject = new voltmx.sdk.VMXObjSvc("Organization");
    var syncOptions = {};

    //Set uploadRequestQueryParams to be sent during sync in syncOptions.    
    syncOptions.uploadRequestQueryParams = {
        "LocationID": "32001",
        "SiteID": "2"
    };

    //Set filters to be applied during download on multiple objects
    syncOptions.filter = {
        "Employee": "EmployeeID eq 2",
        "Department": "Name eq 'Human Resource'"
    };

    //Set upload BatchSize.
    syncOptions.uploadBatchSize = "200";

    //Set getSyncStats to receive sync stats on sync success.
    syncOptions.getSyncStats = "true";

    //Set syncType to perform a sync session
    syncOptions.syncType = "uploadOnly";

    //Supplying call back to receive sync progress events too
    syncObject.startSync(syncOptions, successCallback,
        failureCallback, progressCallback);

} catch (err) {
    //Handles Exception.
}

Android (Java)

Signature

void <VMXObjSvc>.startSync(final HashMap<String, Object> syncOptions, final VMXCallback syncCallback, final VMXProgressCallback progressCallback) throws Exception

Parameters

Parameter	Type	Description	Required
syncOptions	HashMap<String, Object>	The user can provide options to customize sync behavior. For example, Filters, downloadBatchSize etc, Refer Sync Options for supported options. Refer Offline Objects Getting Started guide for more details.	Yes
syncCallback	VMXCallback	Application implements onSuccess and onFailure methods of VMXCallback interface.	Yes
progressCallback	VMXProgressCallback	Application implements onProgress method of VMXProgressCallback interface if progress callback is supplied.	No

Sync Options

Options	Type	Descriptions	Required
filter	HashMap<String, Object>	The filter is a valid OData filter string that allows downloading specific records based on the supplied criteria. When the sync is performed at the object service-level, filters are supplied for all objects/entities of that service for which filter criteria needs to be applied as a key-value pair (object name, OData filter string) as shown in the sample code. All records are downloaded for those objects with no or invalid OData filter.	No
downloadBatchSize	Number/String	The downloadBatchSize option defines record based batching in downloads. Care should be taken to provide appropriate batch size (number of records) based on backend’s ability to support the same. downloadBatchSize is 500 (records) by default.	No
uploadBatchSize	Number/String	uploadBatchSize option defines record based batching in uploads. uploadBatchSize is 50(records) by default. Default batch size is assumed if the supplied value is <=0.
getSyncStats	String	The getSyncStats option is used to get sync stats information through sync success callback. This option takes two values true or false. Sync stats information is not returned to the user if getSyncStats option is not supplied or set to false or an invalid value.	No
syncType	String	downloadOnly will download the changes from the server. Change on the client side will not be pushed to the sever.uploadOnly will upload the changes from the client device to the server. Changes on the server will not be downloaded.fullSync will perform both upload and download from the client device to the server and vice-versa.Note: Sync will move to the error state, if any other value is provided other than the above mentioned values.If sync type is not selected, full sync is performed by default.	No
uploadRequestQueryParams	HashMap<String, String>	The uploadRequestQueryParams option is used to pass the query parameters in upload network requests. *Note:* The keys and values in the Hashmap must be of the string data type.	No
downloadRequestQueryParams	HashMap<String, String>	The downloadRequestQueryParams is used to pass the query parameters in download network requests. *Note:* The keys and values in the Hashmap must be of the string data type.	No
downloadReconciliationRequired	Boolean	This parameter specifies if download reconciliation is required or not. Download reconciliation is used to compare primary keys present in backend with application database primary keys for an object. In scenarios where there are no pending edits, it is advisable to perform startSync by setting downloadReconciliationRequired to false (as in the case of initial sync). downloadReconciliationRequired is set to true, by default.	No
preserveBatchContext	Boolean	preserveBatchContext specifies whether to preserve the batchContext of last successful download batch. If batchContext is preserved, the successive download call resumes from the last successful batch, else it starts from the first batch again. Set the option to True, to resume the download from last successful batch. Set the option to False, to start downloading from the first batch. preserveBatchContext is set to false, by default.	No

Return Type

void

Example

try {
    //Create an instance of VMXObjSvc 
    KVMXObjSvc syncObject = new
    VMXObjSvc("Organization");

    HashMap < String, Object > syncOptions = new HashMap < String, Object > ();

    //Set downloadRequestQueryParams to be applied during download on multiple objects
    HashMap < String, String > downloadRequestQueryParams = new HashMap < String, String > ();
    downloadRequestQueryParams("LocationID", "32001");
    downloadRequestQueryParams("SiteID", "2");
    syncOptions.put("downloadRequestQueryParams", downloadRequestQueryParams);


    //Set filters to be applied during download on multiple objects
    HashMap < String, Object > filters = new HashMap < String, Object > ();
    filters.put("Employee", "EmployeeID eq 2");
    filters.put("Department", "Name eq ‘Human Resource’");
    syncOptions.put("filter", filters);


    //Set download BatchSize.
    syncOptions.put("downloadBatchSize", "100");

    //Set getSyncStats to receive sync stats on sync success.    
    syncOptions.put("getSyncStats", "true");

    //Set syncType to perform a sync session
    syncOptions.put("syncType", "downloadOnly");

    //Supplying call back to receive sync progress events too               
    syncObject.startSync(syncOptions,
        new VMXCallback() {
            @Override
            public void onSuccess(Object object) {
                Log.d("ObjectServiceSync", "ObjectService sync   successful");
            }

            @Override
            public void onFailure(Object error) {
                OfflineObjectsException e = (OfflineObjectsException) error;
                Log.e("ObjectServiceSync", "ObjectService sync 
            failed with error: " + e.getMessage());
            }
        },
        new VMXProgressCallback() {
            @Override
            public void onProgress(Object object) {
                Log.d("ObjectServiceSync", "ObjectService sync progress event received");
            }
        });
} catch (Exception e) {
    Log.e("ObjectServiceSync", "ObjectService sync failed with error:" + e.getMessage());
}

iOS (Objective C)

Signature

void <VMXObjSvc> startSync:(NSDictionary <NSString *, id> *)syncOptions
      onSuccess:(VMXSuccessCompletionHandler)onSuccess
      onFailure:(VMXFailureCompletionHandler)onFailure
      onProgress:(VMXProgressCompletionHandler)onProgress;

Parameters

Parameter	Type	Description	Required
syncOptions	NSDictionary<NSString*, id>	A user can provide options to customize sync behavior. For example, Filters, download batch size etc, see Sync Options section for supported options. Refer Offline Objects Getting Started guide for more details.	Yes
onSuccess	VMXSuccessCompletionHandler	The method called after a successful sync.	Yes
onFailure	VMXFailureCompletionHandler	The method called on sync failure.	Yes
onProgress	VMXProgress CompletionHandler	The method called on sync progress events.	No

Sync Options

Options	Type	Descriptions	Required
filter	NSDictionary<NSString*, id>	The filter is a valid OData filter string, allows downloading specific records based on the supplied criteria. When a sync is performed at object service level, filters should be supplied for all objects/entities of that service for which filter criteria needs to be applied as a key-value pair (object name, OData filter string) as shown in the sample code. All records are downloaded for those objects with no or invalid OData filter.	No
downloadBatchSize	NSNumber/NSString	The downloadBatchSize option defines record based batching in downloads. Care should be taken to provide appropriate BatchSize (number of records) based on backend’s ability to support the same. downloadBatchSize is 500 (records) by default.	No
uploadBatchSize	NSNumber/NSString	uploadBatchSize option defines record based batching in uploads. uploadBatchSize is 50 (records) by default. Default BatchSize is assumed if the supplied values<=0.	No
getSyncStats	NSString	The getSyncStats option is used to get sync stats information through sync success callback. This option takes two values true or false. Sync stats information is not returned to the user if getSyncStats option is not supplied or set to "false" or an invalid value.	No
syncType	String	downloadOnly will download the changes from the server. Change on the client side will not be pushed to the sever.uploadOnly will upload the changes from the client device to the server. Changes on the server will not be downloaded.fullSync will perform both upload and download from the client device to the server and vice-versa.Note: Sync will move to the error state, if any other value is provided other than the above mentioned values.If sync type is not selected, full sync is performed by default.	No
uploadRequestQueryParams	NSDictionary<NSString*, id>	The uploadRequestQueryParams option is used to pass query parameters in the upload network requests. *Note:* The keys and values in the NSDictionary must be of the string data type.	No
downloadRequestQueryParams	NSDictionary<NSString*, id>	The downloadRequestQueryParams option is used to pass query parameters in download network requests. *Note:* The keys and values in the NSDictionary must be of the string data type.	No
downloadReconciliationRequired	Boolean	This parameter specifies if download reconciliation is required or not. Download reconciliation is used to compare primary keys present in backend with application database primary keys for an object. In scenarios where there are no pending edits, it is advisable to perform startSync by setting downloadReconciliationRequired to false (as in the case of initial sync). downloadReconciliationRequired is set to true, by default.	No
preserveBatchContext	Boolean	preserveBatchContext specifies whether to preserve the batchContext of last successful download batch. If batchContext is preserved, the successive download call resumes from the last successful batch, else it starts from the first batch again. Set the option to True, to resume the download from last successful batch. Set the option to False, to start downloading from the first batch. preserveBatchContext is set to false, by default.	No

Return Type

void

Example

NSError * error;

 VMXObjSvc * syncObject = [
     [VMXObjSvc alloc] initWithName: @"Organization"
     error: & error
 ];

 if (error) {
     NSLog(@"Object Service Object Creation Failed");
 } else {
     VMXSuccessCompletionHandler onSuccess = ^ void(id object) {
         //Operation to be performed on successful sync.
     };

     VMXFailureCompletionHandler onFailure = ^ void(id object) {
         //Operation to be performed on sync failure.
     };

     VMXProgressCompletionHandler onProgress = ^ void(id object) {
         //Operation to be performed on sync progress.
     };

     NSMutableDictionary * syncOptions = [NSMutableDictionary new];

     //Set uploadRequestQueryParams to be applied during upload on multiple objects
     NSMutableDictionary * uploadRequestQueryParams = [NSMutableDictionary new];
     uploadRequestQueryParams[@"LocationID"] = @"32001";
     uploadRequestQueryParams[@"SiteID"] = @"2";
     [syncOptions setObject: uploadRequestQueryParams
         forKey: @"uploadRequestQueryParams"
     ];

     //Set downloadRequestQueryParams to be applied during download on multiple objects
     NSMutableDictionary * downloadRequestQueryParams = [NSMutableDictionary new];
     downloadRequestQueryParams[@"LocationID"] = @"32001";
     downloadRequestQueryParams[@"SiteID"] = @"2";
     [syncOptions setObject: downloadRequestQueryParams
         forKey: @"downloadRequestQueryParams"
     ];

     //Set filters to be applied during download on object
     NSMutableDictionary * filters = [NSMutableDictionary new];
     [filters setObject: @"EmployeeID eq 2"
         forKey: @"Employee"
     ];

     [filters setObject: @"Name eq ‘Human Resource’"
         forKey: @"Department"
     ];

     [syncOptions setObject: filters
         forKey: @"filter"
     ];

     //Set upload and download BatchSize.
     [syncOptions setObject: @"100"
         forKey: @"downloadBatchSize"
     ];
     [syncOptions setObject: @"200"
         forKey: @"uploadBatchSize"
     ];


     //Set getSyncStats to receive sync stats on sync success.
     [syncOptions setObject: @"true"
         forKey: @"getSyncStats"
     ];

     //Set syncType to perform a sync session.
     [syncOptions setObject: @"fullSync"
         forKey: @"syncType"
     ];

     //Supplying call back to receive sync progress events too.
     [syncObject startsync: syncOptions
         onSuccess: onSuccess
         onFailure: onFailure
         onProgress: onProgress
     ];
 }

Note: For more details on Offline Objects features and options, refer Offline Objects Getting Started Guide.