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AbstractFederationConnection.java
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AbstractFederationConnection.java
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/*******************************************************************************
* Copyright (c) 2015 Eclipse RDF4J contributors, Aduna, and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Distribution License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*******************************************************************************/
package org.eclipse.rdf4j.sail.federation;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.http.client.HttpClient;
import org.eclipse.rdf4j.IsolationLevel;
import org.eclipse.rdf4j.IsolationLevels;
import org.eclipse.rdf4j.common.iteration.CloseableIteration;
import org.eclipse.rdf4j.common.iteration.CloseableIteratorIteration;
import org.eclipse.rdf4j.common.iteration.DistinctIteration;
import org.eclipse.rdf4j.common.iteration.ExceptionConvertingIteration;
import org.eclipse.rdf4j.common.iteration.UnionIteration;
import org.eclipse.rdf4j.http.client.HttpClientDependent;
import org.eclipse.rdf4j.http.client.HttpClientSessionManager;
import org.eclipse.rdf4j.http.client.SessionManagerDependent;
import org.eclipse.rdf4j.model.IRI;
import org.eclipse.rdf4j.model.Namespace;
import org.eclipse.rdf4j.model.Resource;
import org.eclipse.rdf4j.model.Statement;
import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.model.ValueFactory;
import org.eclipse.rdf4j.model.impl.SimpleValueFactory;
import org.eclipse.rdf4j.query.BindingSet;
import org.eclipse.rdf4j.query.Dataset;
import org.eclipse.rdf4j.query.QueryEvaluationException;
import org.eclipse.rdf4j.query.algebra.QueryRoot;
import org.eclipse.rdf4j.query.algebra.TupleExpr;
import org.eclipse.rdf4j.query.algebra.evaluation.EvaluationStrategy;
import org.eclipse.rdf4j.query.algebra.evaluation.TripleSource;
import org.eclipse.rdf4j.query.algebra.evaluation.federation.FederatedServiceResolver;
import org.eclipse.rdf4j.query.algebra.evaluation.federation.FederatedServiceResolverClient;
import org.eclipse.rdf4j.query.algebra.evaluation.impl.BindingAssigner;
import org.eclipse.rdf4j.query.algebra.evaluation.impl.CompareOptimizer;
import org.eclipse.rdf4j.query.algebra.evaluation.impl.ConjunctiveConstraintSplitter;
import org.eclipse.rdf4j.query.algebra.evaluation.impl.ConstantOptimizer;
import org.eclipse.rdf4j.query.algebra.evaluation.impl.DisjunctiveConstraintOptimizer;
import org.eclipse.rdf4j.query.algebra.evaluation.impl.SameTermFilterOptimizer;
import org.eclipse.rdf4j.query.explanation.Explanation;
import org.eclipse.rdf4j.query.impl.EmptyBindingSet;
import org.eclipse.rdf4j.repository.Repository;
import org.eclipse.rdf4j.repository.RepositoryConnection;
import org.eclipse.rdf4j.repository.RepositoryException;
import org.eclipse.rdf4j.repository.RepositoryResolver;
import org.eclipse.rdf4j.repository.RepositoryResolverClient;
import org.eclipse.rdf4j.repository.RepositoryResult;
import org.eclipse.rdf4j.repository.filters.AccurateRepositoryBloomFilter;
import org.eclipse.rdf4j.repository.filters.RepositoryBloomFilter;
import org.eclipse.rdf4j.sail.SailConnection;
import org.eclipse.rdf4j.sail.SailException;
import org.eclipse.rdf4j.sail.federation.optimizers.EmptyPatternOptimizer;
import org.eclipse.rdf4j.sail.federation.optimizers.FederationJoinOptimizer;
import org.eclipse.rdf4j.sail.federation.optimizers.OwnedTupleExprPruner;
import org.eclipse.rdf4j.sail.federation.optimizers.PrepareOwnedTupleExpr;
import org.eclipse.rdf4j.sail.federation.optimizers.QueryModelPruner;
import org.eclipse.rdf4j.sail.federation.optimizers.QueryMultiJoinOptimizer;
import org.eclipse.rdf4j.sail.helpers.AbstractSail;
import org.eclipse.rdf4j.sail.helpers.AbstractSailConnection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Unions the results from multiple {@link RepositoryConnection} into one {@link SailConnection}.
*
* @author James Leigh
* @author Arjohn Kampman
*/
abstract class AbstractFederationConnection extends AbstractSailConnection implements FederatedServiceResolverClient,
RepositoryResolverClient, HttpClientDependent, SessionManagerDependent {
private static final Logger LOGGER = LoggerFactory.getLogger(AbstractFederationConnection.class);
private final Federation federation;
private final ValueFactory valueFactory;
protected final List<RepositoryConnection> members;
/**
* Connection specific resolver.
*/
private FederatedServiceResolver federatedServiceResolver;
public AbstractFederationConnection(Federation federation, List<RepositoryConnection> members) {
super(new AbstractSail() {
@Override
public boolean isWritable() throws SailException {
return false;
}
@Override
public ValueFactory getValueFactory() {
return SimpleValueFactory.getInstance();
}
@Override
protected void shutDownInternal() throws SailException {
// ignore
}
@Override
protected SailConnection getConnectionInternal() throws SailException {
return null;
}
@Override
protected void connectionClosed(SailConnection connection) {
// ignore
}
@Override
public List<IsolationLevel> getSupportedIsolationLevels() {
return Arrays.asList(new IsolationLevel[] { IsolationLevels.NONE });
}
@Override
public IsolationLevel getDefaultIsolationLevel() {
return IsolationLevels.NONE;
}
});
this.federation = federation;
valueFactory = SimpleValueFactory.getInstance();
this.members = new ArrayList<>(members);
}
public ValueFactory getValueFactory() {
return valueFactory;
}
@Override
public void closeInternal() throws SailException {
excute(RepositoryConnection::close);
}
@Override
public CloseableIteration<? extends Resource, SailException> getContextIDsInternal() throws SailException {
CloseableIteration<? extends Resource, SailException> cursor = union(RepositoryConnection::getContextIDs);
cursor = new DistinctIteration<Resource, SailException>(cursor);
return cursor;
}
public FederatedServiceResolver getFederatedServiceResolver() {
if (federatedServiceResolver == null) {
return federation.getFederatedServiceResolver();
}
return federatedServiceResolver;
}
@Override
public void setFederatedServiceResolver(FederatedServiceResolver resolver) {
this.federatedServiceResolver = resolver;
for (RepositoryConnection member : members) {
if (member instanceof FederatedServiceResolverClient) {
((FederatedServiceResolverClient) member).setFederatedServiceResolver(resolver);
}
}
}
@Override
public void setRepositoryResolver(RepositoryResolver resolver) {
for (RepositoryConnection member : members) {
if (member instanceof RepositoryResolverClient) {
((RepositoryResolverClient) member).setRepositoryResolver(resolver);
}
}
}
@Override
public HttpClientSessionManager getHttpClientSessionManager() {
for (RepositoryConnection member : members) {
if (member instanceof SessionManagerDependent) {
HttpClientSessionManager client = ((SessionManagerDependent) member).getHttpClientSessionManager();
if (client != null) {
return client;
}
}
}
return null;
}
@Override
public void setHttpClientSessionManager(HttpClientSessionManager client) {
for (RepositoryConnection member : members) {
if (member instanceof SessionManagerDependent) {
((SessionManagerDependent) member).setHttpClientSessionManager(client);
}
}
}
@Override
public HttpClient getHttpClient() {
for (RepositoryConnection member : members) {
if (member instanceof HttpClientDependent) {
HttpClient client = ((HttpClientDependent) member).getHttpClient();
if (client != null) {
return client;
}
}
}
return null;
}
@Override
public void setHttpClient(HttpClient client) {
for (RepositoryConnection member : members) {
if (member instanceof HttpClientDependent) {
((HttpClientDependent) member).setHttpClient(client);
}
}
}
@Override
public String getNamespaceInternal(String prefix) throws SailException {
try {
String namespace = null;
for (RepositoryConnection member : members) {
String candidate = member.getNamespace(prefix);
if (namespace == null) {
namespace = candidate;
} else if (candidate != null && !candidate.equals(namespace)) {
namespace = null; // NOPMD
break;
}
}
return namespace;
} catch (RepositoryException e) {
throw new SailException(e);
}
}
@Override
public CloseableIteration<? extends Namespace, SailException> getNamespacesInternal() throws SailException {
Map<String, Namespace> namespaces = new HashMap<>();
Set<String> prefixes = new HashSet<>();
Set<String> conflictedPrefixes = new HashSet<>();
try {
for (RepositoryConnection member : members) {
try (RepositoryResult<Namespace> memberNamespaces = member.getNamespaces()) {
while (memberNamespaces.hasNext()) {
Namespace next = memberNamespaces.next();
String prefix = next.getPrefix();
if (prefixes.add(prefix)) {
namespaces.put(prefix, next);
} else if (!next.getName().equals(namespaces.get(prefix).getName())) {
conflictedPrefixes.add(prefix);
}
}
}
}
} catch (RepositoryException e) {
throw new SailException(e);
}
for (String prefix : conflictedPrefixes) {
namespaces.remove(prefix);
}
return new CloseableIteratorIteration<>(namespaces.values().iterator());
}
@Override
public long sizeInternal(Resource... contexts) throws SailException {
try {
if (federation.isDistinct()) {
long size = 0;
for (RepositoryConnection member : members) {
size += member.size(contexts);
}
return size; // NOPMD
} else {
try (CloseableIteration<? extends Statement, SailException> cursor = getStatements(null, null, null,
false, contexts)) {
long size = 0;
while (cursor.hasNext()) {
cursor.next();
size++;
}
return size;
}
}
} catch (RepositoryException e) {
throw new SailException(e);
}
}
@Override
public CloseableIteration<? extends Statement, SailException> getStatementsInternal(final Resource subj,
final IRI pred, final Value obj, final boolean includeInferred, final Resource... contexts)
throws SailException {
CloseableIteration<? extends Statement, SailException> cursor = union(
(RepositoryConnection member) -> member.getStatements(subj, pred, obj, includeInferred, contexts));
if (!federation.isDistinct() && !isLocal(pred)) {
// Filter any duplicates
cursor = new DistinctIteration<Statement, SailException>(cursor);
}
return cursor;
}
@Override
public CloseableIteration<? extends BindingSet, QueryEvaluationException> evaluateInternal(TupleExpr query,
Dataset dataset, BindingSet bindings, boolean inf) throws SailException {
TripleSource tripleSource = new FederationTripleSource(inf);
EvaluationStrategy strategy = federation.createEvaluationStrategy(tripleSource, dataset,
getFederatedServiceResolver());
TupleExpr qry = optimize(query, dataset, bindings, inf, strategy);
try {
return strategy.evaluate(qry, EmptyBindingSet.getInstance());
} catch (QueryEvaluationException e) {
throw new SailException(e);
}
}
private class FederationTripleSource implements TripleSource {
private final boolean inf;
public FederationTripleSource(boolean includeInferred) {
this.inf = includeInferred;
}
@Override
public CloseableIteration<? extends Statement, QueryEvaluationException> getStatements(Resource subj, IRI pred,
Value obj, Resource... contexts) throws QueryEvaluationException {
try {
CloseableIteration<? extends Statement, SailException> result = AbstractFederationConnection.this
.getStatements(subj, pred, obj, inf, contexts);
return new ExceptionConvertingIteration<Statement, QueryEvaluationException>(result) {
@Override
protected QueryEvaluationException convert(Exception e) {
return new QueryEvaluationException(e);
}
};
} catch (SailException e) {
throw new QueryEvaluationException(e);
}
}
@Override
public ValueFactory getValueFactory() {
return valueFactory;
}
}
private TupleExpr optimize(TupleExpr parsed, Dataset dataset, BindingSet bindings, boolean includeInferred,
EvaluationStrategy strategy) throws SailException {
LOGGER.trace("Incoming query model:\n{}", parsed);
// Clone the tuple expression to allow for more aggressive optimisations
TupleExpr query = new QueryRoot(parsed.clone());
new BindingAssigner().optimize(query, dataset, bindings);
new ConstantOptimizer(strategy).optimize(query, dataset, bindings);
new CompareOptimizer().optimize(query, dataset, bindings);
new ConjunctiveConstraintSplitter().optimize(query, dataset, bindings);
new DisjunctiveConstraintOptimizer().optimize(query, dataset, bindings);
new SameTermFilterOptimizer().optimize(query, dataset, bindings);
new QueryModelPruner().optimize(query, dataset, bindings);
new QueryMultiJoinOptimizer().optimize(query, dataset, bindings);
// new FilterOptimizer().optimize(query, dataset, bindings);
// prepare bloom filters
RepositoryBloomFilter defaultBloomFilter = new AccurateRepositoryBloomFilter(includeInferred);
Map<Repository, RepositoryBloomFilter> bloomFilters = federation.getBloomFilters();
java.util.function.Function<Repository, RepositoryBloomFilter> bloomFilterFunction = c -> bloomFilters
.getOrDefault(c, defaultBloomFilter);
new EmptyPatternOptimizer(members, bloomFilterFunction).optimize(query, dataset, bindings);
boolean distinct = federation.isDistinct();
PrefixHashSet local = federation.getLocalPropertySpace();
new FederationJoinOptimizer(members, distinct, local, bloomFilterFunction).optimize(query, dataset, bindings);
new OwnedTupleExprPruner().optimize(query, dataset, bindings);
new QueryModelPruner().optimize(query, dataset, bindings);
new QueryMultiJoinOptimizer().optimize(query, dataset, bindings);
new PrepareOwnedTupleExpr().optimize(query, dataset, bindings);
LOGGER.trace("Optimized query model:\n{}", query);
return query;
}
interface Procedure {
void run(RepositoryConnection member) throws RepositoryException;
}
void excute(Procedure operation) throws SailException { // NOPMD
RepositoryException storeExc = null;
RuntimeException runtimeExc = null;
for (RepositoryConnection member : members) {
try {
operation.run(member);
} catch (RepositoryException e) {
LOGGER.error("Failed to execute procedure on federation members", e);
if (storeExc == null) {
storeExc = e;
}
} catch (RuntimeException e) {
LOGGER.error("Failed to execute procedure on federation members", e);
if (runtimeExc == null) {
runtimeExc = e;
}
}
}
if (storeExc != null) {
throw new SailException(storeExc);
}
if (runtimeExc != null) {
throw runtimeExc;
}
}
private interface Function<E> {
CloseableIteration<? extends E, RepositoryException> call(RepositoryConnection member)
throws RepositoryException;
}
private <E> CloseableIteration<? extends E, SailException> union(Function<E> function) throws SailException {
List<CloseableIteration<? extends E, RepositoryException>> cursors = new ArrayList<>(members.size());
try {
for (RepositoryConnection member : members) {
cursors.add(function.call(member));
}
UnionIteration<E, RepositoryException> result = new UnionIteration<>(cursors);
return new ExceptionConvertingIteration<E, SailException>(result) {
@Override
protected SailException convert(Exception e) {
return new SailException(e);
}
};
} catch (RepositoryException e) {
closeAll(cursors);
throw new SailException(e);
} catch (RuntimeException e) {
closeAll(cursors);
throw e;
}
}
private boolean isLocal(IRI pred) {
if (pred == null) {
return false; // NOPMD
}
PrefixHashSet hash = federation.getLocalPropertySpace();
if (hash == null) {
return false; // NOPMD
}
return hash.match(pred.stringValue());
}
private void closeAll(Iterable<? extends CloseableIteration<?, RepositoryException>> cursors) {
for (CloseableIteration<?, RepositoryException> cursor : cursors) {
try {
cursor.close();
} catch (RepositoryException e) {
LOGGER.error("Failed to close cursor", e);
}
}
}
@Override
public Explanation explain(Explanation.Level level, TupleExpr tupleExpr, Dataset dataset,
BindingSet bindings, boolean includeInferred, int timeoutSeconds) {
throw new UnsupportedOperationException();
}
}