@Override
public Long getMtime(Coll<?> coll, String id) {
DBCollection dbcoll = fixColl(coll);
BasicDBObject found =
(BasicDBObject) dbcoll.findOne(new BasicDBObject(ID_FIELD, id), dboKeysMtime);
if (found == null) return null;
if (!found.containsField(MTIME_FIELD))
return null; // This should not happen! But better to ignore than crash?
return found.getLong(MTIME_FIELD);
}
@Override
public Entry<JsonElement, Long> load(Coll<?> coll, String id) {
DBCollection dbcoll = fixColl(coll);
BasicDBObject raw = (BasicDBObject) dbcoll.findOne(new BasicDBObject(ID_FIELD, id));
if (raw == null) return null;
Long mtime = ((Number) raw.removeField(MTIME_FIELD)).longValue();
raw.removeField(ID_FIELD);
JsonElement element = GsonMongoConverter.mongo2GsonObject(raw);
return new SimpleEntry<JsonElement, Long>(element, mtime);
}
@Override
public Long save(Coll<?> coll, String id, JsonElement data) {
DBCollection dbcoll = fixColl(coll);
BasicDBObject dbo = GsonMongoConverter.gson2MongoObject(data);
Long mtime = System.currentTimeMillis();
dbo.put(MTIME_FIELD, mtime);
dbo.put(ID_FIELD, id);
dbcoll.save(dbo);
return mtime;
}
@Override
public Map<String, Long> getId2mtime(Coll<?> coll) {
Map<String, Long> ret = null;
DBCollection dbcoll = fixColl(coll);
DBCursor cursor = dbcoll.find(dboEmpty, dboKeysIdandMtime);
try {
ret = new HashMap<String, Long>(cursor.count());
while (cursor.hasNext()) {
BasicDBObject raw = (BasicDBObject) cursor.next();
Object remoteId = raw.get(ID_FIELD);
if (!raw.containsField(MTIME_FIELD))
continue; // This should not happen! But better to ignore than crash?
Long mtime = raw.getLong(MTIME_FIELD);
ret.put(remoteId.toString(), mtime);
}
} finally {
cursor.close();
}
return ret;
}