[
https://issues.apache.org/jira/browse/JENA-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16386359#comment-16386359
]
ASF GitHub Bot commented on JENA-1492:
--------------------------------------
Github user ajs6f commented on a diff in the pull request:
https://github.com/apache/jena/pull/369#discussion_r172251788
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/core/TxnDataset2Graph.java ---
@@ -0,0 +1,240 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.jena.sparql.core;
+
+import java.util.*;
+import java.util.function.Consumer;
+
+import org.apache.jena.graph.Graph;
+import org.apache.jena.graph.TransactionHandler;
+import org.apache.jena.query.ReadWrite;
+import org.apache.jena.query.TxnType;
+import org.apache.jena.reasoner.InfGraph;
+import org.apache.jena.shared.LockMRSW;
+import org.apache.jena.sparql.JenaTransactionException;
+
+/**
+ * A {@link Transactional} that passes the transaction operations down to
transactions on
+ * independent graphs.
+ * <p>
+ * There are limitations:
+ * <ul>
+ * <li>we can't atomically do all the commits together in the crash
situation.
+ * <li>This {@code Transactional} maintains a MRSW policy because that is
all that is
+ * required of graphs in general.
+ * </ul>
+ * It does cover the important case of one graph ({@link DatasetGraphOne})
where the one
+ * graph is an InfGraph and should work when the graphs in the dataset is
not changing or
+ * when a new memory graph is added mid-transaction.
+ * <p>
+ * This is not "nested transactions" - theer is no overall "commit" or
"abort". If
+ * failure/restart occurs, some graphs may have commited and others not.
It is the best
+ * that can be done given for an arbitrary collection of graphs, backed by
different
+ * storage and having different capabilities.
+ * <p>
+ * Best practice is to change the graph membership outside of any
transaction,
+ * ideally at setup time of the object using this class. (Caution: SPARQL
Update
+ * can create graphs.
+ * @See {@link DatasetGraphMapLink}
+ * @See {@link DatasetGraphOne}
+ */
+public class TxnDataset2Graph extends TransactionalLock {
+ /**
+ * Control whether to pass down transactions from the dataset to the
graph in the
+ * dataset. This should be set to "true"; setting it "false" causes
the onld,
--- End diff --
`onld` => `old`
> Transactions not passed down for nested models.
> -----------------------------------------------
>
> Key: JENA-1492
> URL: https://issues.apache.org/jira/browse/JENA-1492
> Project: Apache Jena
> Issue Type: Bug
> Components: Fuseki, TDB, TDB2
> Affects Versions: Jena 3.7.0
> Reporter: Andy Seaborne
> Priority: Major
> Attachments: config-tdb2-model.ttl
>
>
> From [users@
> email|https://lists.apache.org/thread.html/eacd92488360298a4916b2b1b0cf2d299797140be1960f84410f9b5d@%3Cusers.jena.apache.org%3E],
> after the configuration sorted out.
> Hierarchies of models, such as inference models, on top of a TBD2
> backed-graph do not pass down the transaction leading to
> {noformat}
> org.apache.jena.dboe.transaction.txn.TransactionException: Not in a
> transaction
> at
> org.apache.jena.dboe.transaction.txn.TransactionalComponentLifecycle.checkTxn(TransactionalComponentLifecycle.java:417)
> at
> org.apache.jena.dboe.trans.bplustree.BPlusTree.getRootRead(BPlusTree.java:159)
> at
> org.apache.jena.dboe.trans.bplustree.BPlusTree.iterator(BPlusTree.java:348)
> at
> org.apache.jena.tdb2.store.tupletable.TupleIndexRecord.all(TupleIndexRecord.java:251)
> at
> org.apache.jena.tdb2.store.tupletable.TupleTable.find(TupleTable.java:148)
> at
> org.apache.jena.tdb2.store.nodetupletable.NodeTupleTableConcrete.find(NodeTupleTableConcrete.java:161)
> at
> org.apache.jena.tdb2.store.nodetupletable.NodeTupleTableConcrete.find(NodeTupleTableConcrete.java:150)
> at
> org.apache.jena.tdb2.store.nodetupletable.NodeTupleTableConcrete.findAsNodeIds(NodeTupleTableConcrete.java:141)
> at org.apache.jena.tdb2.store.TripleTable.find(TripleTable.java:64)
> at
> org.apache.jena.tdb2.store.DatasetGraphTDB.findInDftGraph(DatasetGraphTDB.java:110)
> at
> org.apache.jena.sparql.core.DatasetGraphBaseFind.find(DatasetGraphBaseFind.java:47)
> at
> org.apache.jena.sparql.core.DatasetGraphWrapper.find(DatasetGraphWrapper.java:152)
> at org.apache.jena.sparql.core.GraphView.graphBaseFind(GraphView.java:125)
> at org.apache.jena.graph.impl.GraphBase.find(GraphBase.java:255)
> {noformat}
> Example configuration (full version attached):
> {noformat}
> :service a fuseki:Service ;
> fuseki:dataset :dataset ;
> ...
> ## Wrapper: Datset containing one TDB2-backed graph
> :dataset a ja:RDFDataset ;
> ja:defaultGraph :graph .
> ## TDB2-backed graph
> :graph rdf:type tdb2:GraphTDB ;
> tdb2:dataset :datasetTDB2 .
> ## TDB2 database
> :datasetTDB2 rdf:type tdb2:DatasetTDB2 ;
> tdb2:location "DB2".
> {noformat}
>
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