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ExecutionResultTest.java
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ExecutionResultTest.java
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/*
* Copyright (c) 2002-2016 "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.javacompat;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.neo4j.cypher.ArithmeticException;
import org.neo4j.cypher.internal.javacompat.ExecutionEngine;
import org.neo4j.cypher.internal.javacompat.ExecutionResult;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.graphdb.Result;
import org.neo4j.graphdb.Transaction;
import org.neo4j.helpers.collection.Iterables;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.impl.core.ThreadToStatementContextBridge;
import org.neo4j.kernel.impl.coreapi.TopLevelTransaction;
import org.neo4j.test.ImpermanentDatabaseRule;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.core.IsNull.notNullValue;
import static org.hamcrest.core.IsNull.nullValue;
public class ExecutionResultTest
{
@Rule
public final ImpermanentDatabaseRule db = new ImpermanentDatabaseRule();
private ExecutionEngine engine;
@Before
public void initializeExecutionEngine() throws Exception
{
engine = new ExecutionEngine( db );
}
//TODO this test is not valid for compiled runtime as the transaction will be closed when the iterator was created
@Test
public void shouldCloseTransactionsWhenIteratingResults() throws Exception
{
// Given an execution result that has been started but not exhausted
createNode();
createNode();
ExecutionResult executionResult = engine.execute( "CYPHER runtime=interpreted MATCH (n) RETURN n" );
ResourceIterator<Map<String,Object>> resultIterator = executionResult.iterator();
resultIterator.next();
assertThat( activeTransaction(), is( notNullValue() ) );
// When
resultIterator.close();
// Then
assertThat( activeTransaction(), is( nullValue() ) );
}
//TODO this test is not valid for compiled runtime as the transaction will be closed when the iterator was created
@Test
public void shouldCloseTransactionsWhenIteratingOverSingleColumn() throws Exception
{
// Given an execution result that has been started but not exhausted
createNode();
createNode();
ExecutionResult executionResult = engine.execute( "CYPHER runtime=interpreted MATCH (n) RETURN n" );
ResourceIterator<Node> resultIterator = executionResult.columnAs( "n" );
resultIterator.next();
assertThat( activeTransaction(), is( notNullValue() ) );
// When
resultIterator.close();
// Then
assertThat( activeTransaction(), is( nullValue() ) );
}
@Test( expected = ArithmeticException.class )
public void shouldThrowAppropriateException() throws Exception
{
engine.execute( "RETURN rand()/0" ).iterator().next();
}
@Test( expected = ArithmeticException.class )
public void shouldThrowAppropriateExceptionAlsoWhenVisiting() throws Exception
{
engine.execute( "RETURN rand()/0" ).accept( new Result.ResultVisitor()
{
@Override
public boolean visit( Result.ResultRow row )
{
return true;
}
} );
}
@Test
public void shouldBePossibleToConsumeCompiledExecutionResultsWithIterator()
{
// Given
createNode();
createNode();
// When
List<Map<String,Object>> listResult;
try ( Result result = db.execute( "CYPHER runtime=compiled MATCH (n) RETURN n" ) )
{
listResult = Iterables.toList( result );
}
// Then
assertThat( listResult, hasSize( 2 ) );
}
@Test
public void shouldBePossibleToCloseNotFullyConsumedCompiledExecutionResults()
{
// Given
createNode();
createNode();
// When
Map<String,Object> firstRow = null;
try ( Result result = db.execute( "CYPHER runtime=compiled MATCH (n) RETURN n" ) )
{
if ( result.hasNext() )
{
firstRow = result.next();
}
}
// Then
assertThat( firstRow, notNullValue() );
}
@Test
public void shouldBePossibleToConsumeCompiledExecutionResultsWithVisitor()
{
// Given
createNode();
createNode();
// When
final List<Result.ResultRow> listResult = new ArrayList<>();
try ( Result result = db.execute( "CYPHER runtime=compiled MATCH (n) RETURN n" ) )
{
result.accept( new Result.ResultVisitor<RuntimeException>()
{
@Override
public boolean visit( Result.ResultRow row ) throws RuntimeException
{
listResult.add( row );
return true;
}
} );
}
// Then
assertThat( listResult, hasSize( 2 ) );
}
@Test
public void shouldBePossibleToCloseNotFullyVisitedCompiledExecutionResult()
{
// Given
createNode();
createNode();
// When
final List<Result.ResultRow> listResult = new ArrayList<>();
try ( Result result = db.execute( "CYPHER runtime=compiled MATCH (n) RETURN n" ) )
{
result.accept( new Result.ResultVisitor<RuntimeException>()
{
@Override
public boolean visit( Result.ResultRow row ) throws RuntimeException
{
listResult.add( row );
// return false so that no more result rows would be visited
return false;
}
} );
}
// Then
assertThat( listResult, hasSize( 1 ) );
}
@Test
public void shouldBePossibleToCloseNotConsumedCompiledExecutionResult()
{
// Given
createNode();
// When
try ( Result ignore = db.execute( "CYPHER runtime=compiled MATCH (n) RETURN n" ) )
{
// Then
// just close result without consuming it
}
}
private void createNode()
{
try ( Transaction tx = db.beginTx() )
{
db.createNode();
tx.success();
}
}
private TopLevelTransaction activeTransaction()
{
ThreadToStatementContextBridge bridge = db.getDependencyResolver().resolveDependency(
ThreadToStatementContextBridge.class );
KernelTransaction kernelTransaction = bridge.getTopLevelTransactionBoundToThisThread( false );
return kernelTransaction == null ? null : new TopLevelTransaction( kernelTransaction, null );
}
}