+1 to all the changes.
On Wed, Nov 28, 2012 at 2:07 PM, Andy Seaborne <a...@apache.org> wrote: > We're looking at simplifying the core of Jena. There are features in the > Graph layer that are not used but do potential add a complexity cost to > graph implementations (e.g. storage systems). > > The RDF APIs will not change but there are some implications and we'd like > feedback. > > 1/ Graph level bulk update handler. > > This is used by components that want to insert in bulk for some reason. We > decided that is the wrong way to do it (the batching should be done by any > receiving storage layer that cares) and it's not used. > > If removed, ModelChangedListener would change, at least in effect, even if > not in signature. > > At the moment there are difference event callbacks for different ways to add > a batch of statements, whether a list, an array, a model or a iterator was > used. Instead, all these would be replaced by multiple calls of > addedStatment/removedStatement. > > If you use StatementListener, that's what already happens. > > Does any code depend and use knowing the unit of update? > > ---- > > The Model API operations would remain: > > Model.add(Model) > Model.add(Statement[]) > Model.add(StmtIterator iter) > Model.add(List<Statement> statements) > Model.remove(Statement[]) > Model.remove(StmtIterator iter) > Model.remove(List<Statement> statements) > > will remain. > > 2/ Reification > > Currently there are three modes : Standard, Convenient and Minimal. > > The default is "Standard" and TDB and SDB only support standard. > > Standard does not require any additional state management - it can be > provided with pure code that runs when reifications operations are made. > Convenient and Minimal hide partial reifications from view and require > statement management. Only the memory models support Convenient and Minimal > (RDB did - but it's gone.) > > The idea is that the graph-level would not deal in reification at all, and > "Standard" reification semantics would be provided in the model-layer > implementation via code similar to that used by TDB and SDB currently. > > The code as used by SDB and TDB is in > com.hp.hpl.jena.sparql.graph.Reifiers2. > > Does anyone use "convenient" or "minimal"? > > 3/ Graph level query. > > This is not SPARQL and is unrelated to SPARQL execution. > > There is a separate "query" system inside the graph layer which was > developed for RDQL. SPARQL is a bit more complicated. It's main use now is > in reification and if that is removed, and replaced then there is no need > for it in the graph layer. > > Does any one use this code? If you have never heard of it, then you're not > using it except via reification. > > Andy > > PS If you want to know why things are the way they currently are, I tried to > write that down in: > > http://mail-archives.apache.org/mod_mbox/jena-dev/201209.mbox/%3c5045b68c.4040...@apache.org%3E
