public void synchronize(boolean manualSync, SyncResult syncResult)
throws URISyntaxException, LocalStorageException, IOException, HttpException, DavException {
// PHASE 1: push local changes to server
int deletedRemotely = pushDeleted(), addedRemotely = pushNew(), updatedRemotely = pushDirty();
syncResult.stats.numEntries = deletedRemotely + addedRemotely + updatedRemotely;
// PHASE 2A: check if there's a reason to do a sync with remote (= forced sync or remote CTag
// changed)
boolean fetchCollection = syncResult.stats.numEntries > 0;
if (manualSync) {
Log.i(TAG, "Synchronization forced");
fetchCollection = true;
}
if (!fetchCollection) {
String currentCTag = remote.getCTag(), lastCTag = local.getCTag();
Log.d(TAG, "Last local CTag = " + lastCTag + "; current remote CTag = " + currentCTag);
if (currentCTag == null || !currentCTag.equals(lastCTag)) fetchCollection = true;
}
if (!fetchCollection) {
Log.i(TAG, "No local changes and CTags match, no need to sync");
return;
}
// PHASE 2B: detect details of remote changes
Log.i(TAG, "Fetching remote resource list");
Set<Resource> remotelyAdded = new HashSet<Resource>(),
remotelyUpdated = new HashSet<Resource>();
Resource[] remoteResources = remote.getMemberETags();
for (Resource remoteResource : remoteResources) {
try {
Resource localResource = local.findByRemoteName(remoteResource.getName(), false);
if (localResource.getETag() == null
|| !localResource.getETag().equals(remoteResource.getETag()))
remotelyUpdated.add(remoteResource);
} catch (RecordNotFoundException e) {
remotelyAdded.add(remoteResource);
}
}
// PHASE 3: pull remote changes from server
syncResult.stats.numInserts = pullNew(remotelyAdded.toArray(new Resource[0]));
syncResult.stats.numUpdates = pullChanged(remotelyUpdated.toArray(new Resource[0]));
syncResult.stats.numEntries += syncResult.stats.numInserts + syncResult.stats.numUpdates;
Log.i(TAG, "Removing non-dirty resources that are not present remotely anymore");
local.deleteAllExceptRemoteNames(remoteResources);
local.commit();
// update collection CTag
Log.i(TAG, "Sync complete, fetching new CTag");
local.setCTag(remote.getCTag());
}
