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EagerResultITTest.java
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EagerResultITTest.java
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/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.cypher.internal.javacompat;
import org.hamcrest.Matchers;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.function.LongSupplier;
import org.neo4j.graphdb.DependencyResolver;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.NotFoundException;
import org.neo4j.graphdb.QueryExecutionException;
import org.neo4j.graphdb.QueryExecutionType;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.graphdb.Result;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseBuilder;
import org.neo4j.graphdb.factory.GraphDatabaseFactoryState;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.helpers.collection.Iterables;
import org.neo4j.io.pagecache.tracing.cursor.context.VersionContext;
import org.neo4j.io.pagecache.tracing.cursor.context.VersionContextSupplier;
import org.neo4j.kernel.GraphDatabaseDependencies;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.configuration.Settings;
import org.neo4j.kernel.impl.context.TransactionVersionContext;
import org.neo4j.kernel.impl.context.TransactionVersionContextSupplier;
import org.neo4j.kernel.impl.factory.CommunityEditionModule;
import org.neo4j.kernel.impl.factory.DatabaseInfo;
import org.neo4j.kernel.impl.factory.GraphDatabaseFacade;
import org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory;
import org.neo4j.kernel.impl.factory.PlatformModule;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
import org.neo4j.test.TestGraphDatabaseFactory;
import org.neo4j.test.rule.TestDirectory;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
public class EagerResultITTest
{
@Rule
public final TestDirectory testDirectory = TestDirectory.testDirectory();
private GraphDatabaseService database;
private TestTransactionVersionContextSupplier testContextSupplier;
private File storeDir;
private TestVersionContext testCursorContext;
@Before
public void setUp()
{
storeDir = testDirectory.directory();
testContextSupplier = new TestTransactionVersionContextSupplier();
database = startRestartableDatabase();
prepareData();
TransactionIdStore transactionIdStore = getTransactionIdStore();
testCursorContext = new TestVersionContext( transactionIdStore::getLastClosedTransactionId );
testContextSupplier.setCursorContext( testCursorContext );
}
@After
public void tearDown()
{
if ( database != null )
{
database.shutdown();
}
}
@Test
public void eagerResultContainsAllData()
{
Result result = database.execute( "MATCH (n) RETURN n.c" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
int rows = 0;
while ( result.hasNext() )
{
result.next();
rows++;
}
assertEquals( 2, rows );
}
@Test
public void eagerResultContainsExecutionType()
{
Result result = database.execute( "MATCH (n) RETURN n.c" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
assertEquals( QueryExecutionType.query( QueryExecutionType.QueryType.READ_ONLY ), result.getQueryExecutionType() );
}
@Test
public void eagerResultContainsColumns()
{
Result result = database.execute( "MATCH (n) RETURN n.c as a, count(n) as b" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
assertEquals( Arrays.asList("a", "b"), result.columns() );
}
@Test
public void useColumnAsOnEagerResult()
{
Result result = database.execute( "MATCH (n) RETURN n.c as c, n.b as b" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
ResourceIterator<Object> cValues = result.columnAs( "c" );
int rows = 0;
while ( cValues.hasNext() )
{
cValues.next();
rows++;
}
assertEquals( 2, rows );
}
@Test
public void eagerResultHaveQueryStatistic()
{
Result result = database.execute( "MATCH (n) RETURN n.c" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
assertFalse( result.getQueryStatistics().containsUpdates() );
}
@Test
public void eagerResultHaveExecutionPlan()
{
Result result = database.execute( "profile MATCH (n) RETURN n.c" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
assertEquals( 2, result.getExecutionPlanDescription().getProfilerStatistics().getRows() );
}
@Test
public void eagerResultHaveNotifications()
{
Result result = database.execute( " CYPHER planner=rule MATCH (n) RETURN n.c" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
assertEquals( 1, Iterables.count( result.getNotifications() ) );
}
@Test
public void eagerResultToString()
{
Result result = database.execute( "MATCH (n) RETURN n.c, n.d" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
String resultString = result.resultAsString();
assertTrue( resultString.contains( "n.c, n.d" ) );
assertTrue( resultString.contains( "d, a" ) );
assertTrue( resultString.contains( "y, k" ) );
}
@Test
public void eagerResultWriteAsStringToStream()
{
Result result = database.execute( "MATCH (n) RETURN n.c" );
assertEquals( 1, testCursorContext.getAdditionalAttempts() );
assertEquals( result.resultAsString(), printToStream( result ) );
}
@Test
public void eagerResultVisit() throws Exception
{
Result result = database.execute( "MATCH (n) RETURN n.c" );
List<String> values = new ArrayList<>();
result.accept( (Result.ResultVisitor<Exception>) row ->
{
values.add( row.getString( "n.c" ) );
return false;
} );
assertThat( values, hasSize( 2 ) );
assertThat( values, Matchers.containsInAnyOrder( "d", "y" ) );
}
@Test( expected = QueryExecutionException.class )
public void dirtyContextDuringResultVisitResultInUnstableSnapshotException() throws Exception
{
Result result = database.execute( "MATCH (n) RETURN n.c" );
List<String> values = new ArrayList<>();
result.accept( (Result.ResultVisitor<Exception>) row ->
{
testCursorContext.markAsDirty();
values.add( row.getString( "n.c" ) );
return false;
} );
}
@Test( expected = QueryExecutionException.class )
public void dirtyContextEntityNotFoundExceptionDuringResultVisitResultInUnstableSnapshotException() throws Exception
{
Result result = database.execute( "MATCH (n) RETURN n.c" );
result.accept( (Result.ResultVisitor<Exception>) row ->
{
testCursorContext.markAsDirty();
throw new NotFoundException( new RuntimeException() );
} );
}
private String printToStream( Result result )
{
StringWriter stringWriter = new StringWriter();
PrintWriter printWriter = new PrintWriter( stringWriter );
result.writeAsStringTo( printWriter );
printWriter.flush();
return stringWriter.toString();
}
private void prepareData()
{
Label label = Label.label( "label" );
try ( Transaction transaction = database.beginTx() )
{
Node node = database.createNode( label );
node.setProperty( "c", "d" );
node.setProperty( "d", "a" );
transaction.success();
}
try ( Transaction transaction = database.beginTx() )
{
Node node = database.createNode( label );
node.setProperty( "c", "y" );
node.setProperty( "d", "k" );
transaction.success();
}
}
private GraphDatabaseService startRestartableDatabase()
{
return new CustomGraphDatabaseFactory( new CustomFacadeFactory() )
.newEmbeddedDatabaseBuilder( storeDir )
.setConfig( GraphDatabaseSettings.snapshot_query, Settings.TRUE )
.newGraphDatabase();
}
private TransactionIdStore getTransactionIdStore()
{
DependencyResolver dependencyResolver = ((GraphDatabaseAPI) database).getDependencyResolver();
return dependencyResolver.resolveDependency( TransactionIdStore.class );
}
private class CustomGraphDatabaseFactory extends TestGraphDatabaseFactory
{
private GraphDatabaseFacadeFactory customFacadeFactory;
CustomGraphDatabaseFactory( GraphDatabaseFacadeFactory customFacadeFactory )
{
this.customFacadeFactory = customFacadeFactory;
}
@Override
protected GraphDatabaseBuilder.DatabaseCreator createDatabaseCreator( File storeDir,
GraphDatabaseFactoryState state )
{
return new GraphDatabaseBuilder.DatabaseCreator()
{
@Override
public GraphDatabaseService newDatabase( Map<String,String> config )
{
return newDatabase( Config.defaults( config ) );
}
@Override
public GraphDatabaseService newDatabase( Config config )
{
return customFacadeFactory.newFacade( storeDir, config,
GraphDatabaseDependencies.newDependencies( state.databaseDependencies() ) );
}
};
}
}
private class CustomFacadeFactory extends GraphDatabaseFacadeFactory
{
CustomFacadeFactory()
{
super( DatabaseInfo.COMMUNITY, CommunityEditionModule::new );
}
@Override
protected PlatformModule createPlatform( File storeDir, Config config, Dependencies dependencies,
GraphDatabaseFacade graphDatabaseFacade )
{
return new PlatformModule( storeDir, config, databaseInfo, dependencies, graphDatabaseFacade )
{
@Override
protected VersionContextSupplier createCursorContextSupplier( Config config )
{
return testContextSupplier != null ? testContextSupplier : super.createCursorContextSupplier(config);
}
};
}
}
private class TestVersionContext extends TransactionVersionContext
{
private boolean useCorrectLastCommittedTxId;
private int additionalAttempts;
TestVersionContext( LongSupplier transactionIdSupplier )
{
super( transactionIdSupplier );
}
@Override
public long lastClosedTransactionId()
{
return useCorrectLastCommittedTxId ? TransactionIdStore.BASE_TX_ID : super.lastClosedTransactionId();
}
@Override
public void markAsDirty()
{
super.markAsDirty();
useCorrectLastCommittedTxId = true;
}
@Override
public boolean isDirty()
{
additionalAttempts++;
return super.isDirty();
}
int getAdditionalAttempts()
{
return additionalAttempts;
}
}
private class TestTransactionVersionContextSupplier extends TransactionVersionContextSupplier
{
void setCursorContext( VersionContext versionContext )
{
this.cursorContext.set( versionContext );
}
}
}