Examples with IdSetIterator de.fhg.igd.mongomvcc.helper.IdSetIterator used on opensource projects

Example 1 with IdSetIterator

use of de.fhg.igd.mongomvcc.helper.IdSetIterator in project mongomvcc by igd-geo.

the class MongoDBVBranch method commit.

@Override
public long commit() {
    Index idx = getIndex();
    // clone dirty objects because we clear them below
    Map<String, IdMap> dos = new HashMap<String, IdMap>(idx.getDirtyObjects());
    Commit head = getHeadCommit();
    Commit c = new Commit(_db.getCounter().getNextId(), head.getCID(), _rootCid, dos);
    _tree.addCommit(c);
    updateHead(c);
    // mark deleted objects as deleted in the database
    DB db = _db.getDB();
    String lifetimeAttr = MongoDBConstants.LIFETIME + "." + getRootCid();
    for (Map.Entry<String, IdSet> e : idx.getDeletedOids().entrySet()) {
        DBCollection dbc = db.getCollection(e.getKey());
        IdSetIterator li = e.getValue().iterator();
        while (li.hasNext()) {
            long oid = li.next();
            // save the CID of the commit where the object has been deleted
            dbc.update(new BasicDBObject(MongoDBConstants.ID, oid), new BasicDBObject("$set", new BasicDBObject(lifetimeAttr, head.getCID())));
        }
    }
    // mark dirty objects as inserted
    String instimeAttr = MongoDBConstants.LIFETIME + ".i" + getRootCid();
    for (Map.Entry<String, IdMap> e : dos.entrySet()) {
        DBCollection dbc = db.getCollection(e.getKey());
        IdMap m = e.getValue();
        IdMapIterator li = m.iterator();
        while (li.hasNext()) {
            li.advance();
            long oid = li.value();
            if (oid == -1) {
                // do not save time of insertion
                continue;
            }
            // save the CID of the commit where the object has been inserted
            dbc.update(new BasicDBObject(MongoDBConstants.ID, oid), new BasicDBObject("$set", new BasicDBObject(instimeAttr, head.getCID())));
        }
    }
    // reset index
    idx.clearDirtyObjects();
    // update named branch's head
    if (_name != null) {
        // and then update it
        synchronized (this) {
            // check for conflicts (i.e. if another thread has already updated the branch's head)
            if (_tree.resolveBranch(_name).getCID() != c.getParentCID()) {
                throw new VException("Branch " + _name + " has already been " + "updated by another commit");
            }
            _tree.updateBranchHead(_name, c.getCID());
        }
    }
    return c.getCID();
}