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TDB is a storage subsystem for Jena and ARQ, it is a native triple store providing persistent storage of triples/quads.
/*
* 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.tdb ;
import java.util.Iterator ;
import org.apache.jena.atlas.iterator.Iter ;
import org.apache.jena.atlas.lib.Sync ;
import org.apache.jena.graph.Graph ;
import org.apache.jena.graph.Node ;
import org.apache.jena.ontology.OntModel ;
import org.apache.jena.ontology.impl.OntModelImpl ;
import org.apache.jena.query.ARQ ;
import org.apache.jena.query.Dataset ;
import org.apache.jena.rdf.model.Model ;
import org.apache.jena.reasoner.InfGraph ;
import org.apache.jena.riot.lang.ReaderRIOTRDFXML;
import org.apache.jena.sparql.SystemARQ ;
import org.apache.jena.sparql.core.DatasetGraph ;
import org.apache.jena.sparql.engine.main.StageBuilder ;
import org.apache.jena.sparql.engine.main.StageGenerator ;
import org.apache.jena.sparql.lib.Metadata ;
import org.apache.jena.sparql.mgt.SystemInfo ;
import org.apache.jena.sparql.util.Context ;
import org.apache.jena.sparql.util.MappingRegistry ;
import org.apache.jena.sparql.util.Symbol ;
import org.apache.jena.system.JenaSystem ;
import org.apache.jena.tdb.assembler.AssemblerTDB ;
import org.apache.jena.tdb.modify.UpdateEngineTDB ;
import org.apache.jena.tdb.setup.DatasetBuilderStd ;
import org.apache.jena.tdb.solver.QueryEngineTDB ;
import org.apache.jena.tdb.solver.StageGeneratorDirectTDB ;
import org.apache.jena.tdb.store.DatasetGraphTDB ;
import org.apache.jena.tdb.sys.EnvTDB ;
import org.apache.jena.tdb.sys.SystemTDB ;
import org.apache.jena.tdb.transaction.DatasetGraphTransaction ;
import org.slf4j.Logger ;
import org.slf4j.LoggerFactory ;
public class TDB {
// Initialization statics must be first in the class to avoid
// problems with recursive initialization. Specifcally,
// initLock being null because elsewhere started the initialization
// and is calling into the TDB class.
// The best order is:
// Initialization controls
// All calculated constants
// static { JenaSystem.init() ; }
private static final Object initLock = new Object() ;
private static volatile boolean initialized = false ;
/** IRI for TDB */
public static final String tdbIRI = "http://jena.hpl.hp.com/#tdb" ;
/** Root of TDB-defined parameter names */
public static final String tdbParamNS = SystemTDB.symbolNamespace;
/** Prefix for TDB-defined parameter names */
public static final String tdbSymbolPrefix = SystemTDB.tdbSymbolPrefix;
// Internal logging
private static final Logger log = LoggerFactory.getLogger(TDB.class) ;
/** Logger for loading information */
public static final String logLoaderName = "org.apache.jena.tdb.loader" ;
/** Logger for loading information */
public static final Logger logLoader = LoggerFactory.getLogger(logLoaderName) ;
/** Logger for general information */
public static final String logInfoName = "org.apache.jena.info" ;
/** Logger for general information */
public static final Logger logInfo = LoggerFactory.getLogger(logInfoName) ;
// /** Logger for execution information */
// public static final String logExecName = "org.apache.jena.tdb.exec" ;
// /** Logger for execution information */
// public static final Logger logExec = LoggerFactory.getLogger(logExecName)
// ;
public final static String namespace = "http://jena.hpl.hp.com/2008/tdb#" ;
/** Symbol to use the union of named graphs as the default graph of a query */
public static final Symbol symUnionDefaultGraph = SystemTDB.allocSymbol("unionDefaultGraph") ;
/**
* A String enum Symbol that specifies the type of temporary storage for
* transaction journal write blocks.
*
* "mem" = Java heap memory (default)
* "direct" = Process heap memory
* "mapped" = Memory mapped temporary file
*/
public static final Symbol transactionJournalWriteBlockMode = SystemTDB.allocSymbol("transactionJournalWriteBlockMode") ;
public static Context getContext() {
return ARQ.getContext() ;
}
/**
* Release any and all system resources held by TDB. This does NOT close or
* release datasets or graphs held by client code.
*/
public static void closedown() {
StoreConnection.reset() ;
}
/**
* Set the global flag that control the "No BGP optimizer" warning. Set to
* false to silence the warning
*/
public static void setOptimizerWarningFlag(boolean b) {
DatasetBuilderStd.setOptimizerWarningFlag(b) ;
}
/** Sync a TDB-backed Model. Do nothing if not TDB-backed. */
public static void sync(Model model) {
if ( model instanceof OntModelImpl ) {
OntModelImpl ontModel = (OntModelImpl)model ;
sync(ontModel.getBaseGraph()) ;
return ;
}
// This never happens (there is only one OntModel implementation)
if ( model instanceof OntModel ) {
OntModel ontModel = (OntModel)model ;
sync(ontModel.getBaseModel()) ;
return ;
}
sync(model.getGraph()) ;
}
/** Sync a TDB-backed Graph. Do nothing if not TDB-backed. */
public static void sync(Graph graph) {
if ( graph == null )
return ;
if ( graph instanceof InfGraph ) {
InfGraph infGraph = (InfGraph)graph ;
sync(infGraph.getRawGraph()) ;
return ;
}
syncObject(graph) ;
}
/** Sync a TDB-backed Dataset. Do nothing if not TDB-backed. */
public static void sync(Dataset dataset) {
if ( dataset == null )
return ;
DatasetGraph ds = dataset.asDatasetGraph() ;
sync(ds) ;
}
/** Sync a TDB-backed DatasetGraph. Do nothing if not TDB-backed. */
public static void sync(DatasetGraph dataset) {
if ( dataset == null )
return ;
// Should be: SystemARQ.sync(dataset) ;
if ( dataset instanceof DatasetGraphTDB ) {
syncObject(dataset) ;
return ;
}
if ( dataset instanceof DatasetGraphTransaction ) {
DatasetGraphTransaction dsgt = (DatasetGraphTransaction)dataset ;
// This only sync if the dataset has not been used transactionally.
// Can't sync transactional datasets (it's meaningless)
dsgt.syncIfNotTransactional() ;
return ;
}
// May be a general purpose dataset with TDB objects in it.
sync(dataset.getDefaultGraph()) ;
Iterator iter = dataset.listGraphNodes() ;
iter = Iter.toList(iter).iterator() ; // Avoid iterator concurrency.
for (; iter.hasNext();) {
Node n = iter.next() ;
Graph g = dataset.getGraph(n) ;
sync(g) ;
}
}
/**
* Sync a TDB synchronizable object (model, graph, dataset). If force is
* true, synchronize as much as possible (e.g. file metadata) else make a
* reasonable attempt at synchronization but does not guarantee disk state.
* Do nothing otherwise
*/
private static void syncObject(Object object) {
if ( object == null )
return ;
if ( object instanceof Sync )
((Sync)object).sync() ;
}
// ---- Static constants read by modVersion
// ---- Must be after initialization.
static private String metadataLocation = "org/apache/jena/tdb/tdb-properties.xml" ;
static private Metadata metadata = new Metadata(metadataLocation) ;
/** The root package name for TDB */
public static final String PATH = "org.apache.jena.tdb" ;
// The names known to ModVersion : "NAME", "VERSION", "BUILD_DATE"
public static final String NAME = "TDB" ;
/** The full name of the current TDB version */
public static final String VERSION = metadata.get(PATH + ".version", "DEV") ;
/** The date and time at which this release was built */
public static final String BUILD_DATE = metadata.get(PATH + ".build.datetime", "unset") ;
static { JenaSystem.init(); }
/**
* TDB System initialization - normally, this is not explicitly called
* because Jena system wide initialization occurs automatically.
* However, calling it repeatedly is safe and low cost.
*/
public static void init() {
// Called at start.
if ( initialized ) {
return ;
}
synchronized(initLock) {
if ( initialized ) {
JenaSystem.logLifecycle("TDB.init - return") ;
return ;
}
initialized = true ;
JenaSystem.logLifecycle("TDB.init - start") ;
ReaderRIOTRDFXML.RiotUniformCompatibility = true ;
EnvTDB.processGlobalSystemProperties() ;
MappingRegistry.addPrefixMapping(SystemTDB.tdbSymbolPrefix, SystemTDB.symbolNamespace) ;
AssemblerTDB.init() ;
QueryEngineTDB.register() ;
UpdateEngineTDB.register() ;
wireIntoExecution() ;
JenaSystem.logLifecycle("TDB.init - finish") ;
}
}
private static void wireIntoExecution() {
// Globally change the stage generator to intercept BGP on TDB
Context cxt = ARQ.getContext() ;
StageGenerator orig = StageBuilder.chooseStageGenerator(cxt) ;
// Wire in the TDB stage generator which will make TDB work whether
// or not the TDB executor is used. This means that datasets of mixed
// graph types inside a general purpose dataset work.
StageGenerator stageGenerator = new StageGeneratorDirectTDB(orig) ;
StageBuilder.setGenerator(ARQ.getContext(), stageGenerator) ;
}
// ---- Static constants read by modVersion
// ---- Must be after initialization.
// The names known to ModVersion : "NAME", "VERSION", "BUILD_DATE"
// Final initialization (in case any statics in this file are important).
static {
initialization2() ;
}
private static void initialization2() {
// Set management information.
SystemInfo systemInfo = new SystemInfo(TDB.tdbIRI, TDB.PATH, TDB.VERSION, TDB.BUILD_DATE) ;
SystemARQ.registerSubSystem(systemInfo) ;
}
}