Retaining data for Upload Sync BO

Question

Hi all ,
If I am using an Upload type of Sync BO , the local data on client is sent to server after synchronization . But if I want to retain the data on client after  synchronization , what setting should done or methods called in Java classes ?
   I think I need to edit SyncInboxObserver class  and the class which has method to save the data locally and call getLocal()  setLocal() methods . But I am not sure .
Can anybody help in this ?
Thank You
Rucha Atre

Answer 1

hi rucha,
just a summary of steps:
1) modify your metadata (meRepMeta.xml) and copy the definition of your upload
SyncBo giving it a new name. e.g: you have BOXXXX syncbo & the corresponding
local SyncBo BOXXXX_LOCAL. <b>notice the attributes too.</b>
you need to include your modified meRepMeta.xml in the app and re-deploy it.
<SyncBO id="BOXXXX" version="1" type="upload" allowCreate="false" allowModify="false" allowDelete="false">
<TopStructure name="TOP">
<Field name="SYNC_KEY" type="N" length="10" decimalLength="0" signed="false" isKey="true" isIndex="true">
  <Input type="create">false</Input>
  <Input type="modify">false</Input>
  </Field>
   </TopStructure>
  </SyncBO>
<SyncBO id="BOXXXX_LOCAL" version="1" type="twoWay" allowCreate="true" allowModify="true" allowDelete="true" suppressUpload="true" suppressDownload="true">
<TopStructure name="TOP">
<Field name="SYNC_KEY" type="N" length="10" decimalLength="0" signed="false" isKey="true" isIndex="true">
  <Input type="create">false</Input>
  <Input type="modify">false</Input>
  </Field>
   </TopStructure>
  </SyncBO>
2) implement the MessageReplyObserver and listen for MessageReplyType.SYNC_BEGIN
here's a sample implementation for MessageReplyObserver. you can make use
of the SyncBoOutDeltaObserver as well however it is deprecated.
class BOXXXBackupObserver implements MessageReplyObserver{
  public MessageReplyType[] observeMessageReplyTypes(){
    return new MessageReplyType[]{MessageReplyType.SYNC_BEGIN};
  public void messageReplyReceived(MessageReply messageReply){
    if(MessageReplyType.SYNC_BEGIN == messageReply.getType()){
       SyncBoDataFacade df = SmartSyncRuntime.getInstance().getSyncBoDataFacade();
       SyncBoDescriptorFacade dc = SmartSyncRuntime.getInstance().getSyncBoDescriptorFacade();
       SyncBoDescriptor bdo= dc.getSyncBoDescriptor("BOXXX");
       SyncBoDescriptor bdl = dc.getSyncBoDescriptor("BOXXX_LOCAL");
       try {
         if(bdl!=null){
            SyncBoCollection sbc = df.getSyncBos(bdo);
            for(MeIterator sit = sbc.iterator(); sit.hasNext();){
              SyncBo bo = (SyncBo)sit.next();
              SyncBo bl = df.createEmptySyncBo(bdl);
              copyToLocal(bo,bl);
              df.insertSyncBo(bl);
       } catch (Exception e) {
        e.printStackTrace();
  private void copyToLocal(SyncBo orig, SyncBo local) throws Exception{
     SyncBoDescriptor bdl = local.getSyncBoDescriptor();
     copyFields(orig.getTopRow(),local.getTopRow());
     RowCollection[] rca = orig.getRows();
     for(int idx = 0; idx < rca.length; idx++){
       for(MeIterator rit = rca[idx].iterator(); rit.hasNext();){
         Row ro = (Row)rit.next();
         RowDescriptor rd = bdl.getRowDescriptor(ro.getRowDescriptor().getRowName());
         if(rd!=null){
           Row rl = local.createEmptyRow(rd);
           copyFields(ro,rl);
           local.insertRow(rl);
  private void copyFields(Row orig, Row local) throws ModificationNotAllowedException{
    Field[] o= orig.getFields();
    Field[] l = local.getFields();
    for(int idx=1;  idx<o.length;idx++){
      l[idx].modifyValue(o[idx].getValue());
3) register your observer somewhere in your app. could be in your starting jsp.
  SmartSyncRuntime.getInboxNotifier().registerMessageReplyObserver(new BOXXXBackupObserver());
4) modify your existing pages or add new ones for listing of your local syncbo.
that's it... just note that i never had tested this. im writing it just to give you an
idea and basis for your needs. (typo errors might present).
i didnot put any comments on the code as well. they're pretty self-explanatory i
guess... but if you have questions, just let me know.
regards
jo