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TestResourceProcedure.java
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TestResourceProcedure.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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.internal.cypher.acceptance;
import java.util.Iterator;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.kernel.impl.proc.ComponentRegistry;
import org.neo4j.procedure.Context;
import org.neo4j.procedure.Description;
import org.neo4j.procedure.Mode;
import org.neo4j.procedure.Name;
import org.neo4j.procedure.Procedure;
import org.neo4j.procedure.UserFunction;
public class TestResourceProcedure
{
abstract static class SimulateFailureBaseException extends RuntimeException
{
}
public static class SimulateFailureException extends SimulateFailureBaseException
{
}
public static class SimulateFailureOnCloseException extends SimulateFailureBaseException
{
}
@Context
public GraphDatabaseService db;
@Context
public Counters counters;
public static class Counters
{
public int closeCountTestResourceProcedure;
public int closeCountTestFailingResourceProcedure;
public int closeCountTestOnCloseFailingResourceProcedure;
public int openCountTestResourceProcedure;
public int openCountTestFailingResourceProcedure;
public int openCountTestOnCloseFailingResourceProcedure;
public int liveCountTestResourceProcedure()
{
return openCountTestResourceProcedure - closeCountTestResourceProcedure;
}
public int liveCountTestFailingResourceProcedure()
{
return openCountTestFailingResourceProcedure - closeCountTestFailingResourceProcedure;
}
public int liveCountTestOnCloseFailingResourceProcedure()
{
return openCountTestOnCloseFailingResourceProcedure - closeCountTestOnCloseFailingResourceProcedure;
}
public void reset()
{
closeCountTestResourceProcedure = 0;
closeCountTestFailingResourceProcedure = 0;
closeCountTestOnCloseFailingResourceProcedure = 0;
openCountTestResourceProcedure = 0;
openCountTestFailingResourceProcedure = 0;
openCountTestOnCloseFailingResourceProcedure = 0;
}
}
public static ComponentRegistry.Provider<Counters> countersProvider( Counters counters )
{
return context -> counters;
}
public class Output
{
public Long value;
public Output( Long value )
{
this.value = value;
}
}
@Procedure( name = "org.neo4j.test.testResourceProcedure", mode = Mode.READ )
@Description( "Returns a stream of integers from 1 to the given argument" )
public Stream<Output> testResourceProcedure( @Name( value = "resultCount", defaultValue = "4" ) long resultCount ) throws Exception
{
Stream<Output> stream = Stream.iterate( 1L, i -> i + 1 ).limit( resultCount ).map( Output::new );
stream.onClose( () -> {
counters.closeCountTestResourceProcedure++;
} );
counters.openCountTestResourceProcedure++;
return stream;
}
@Procedure( name = "org.neo4j.test.testFailingResourceProcedure", mode = Mode.READ )
@Description( "Returns a stream of integers from 1 to the given argument, but throws an exception when reaching the last element" )
public Stream<Output> testFailingResourceProcedure( @Name( value = "failCount", defaultValue = "3" ) long failCount ) throws Exception
{
Iterator<Output> failingIterator = new Iterator<Output>()
{
private long step = 1;
@Override
public boolean hasNext()
{
return step <= failCount;
}
@Override
public Output next()
{
if ( step == failCount )
{
throw new SimulateFailureException();
}
return new Output( step++ );
}
};
Iterable<Output> failingIterable = () -> failingIterator;
Stream<Output> stream = StreamSupport.stream( failingIterable.spliterator(), false );
stream.onClose( () -> {
counters.closeCountTestFailingResourceProcedure++;
} );
counters.openCountTestFailingResourceProcedure++;
return stream;
}
@Procedure( name = "org.neo4j.test.testOnCloseFailingResourceProcedure", mode = Mode.READ )
@Description( "Returns a stream of integers from 1 to the given argument. Throws an exception on close." )
public Stream<Output> testOnCloseFailingResourceProcedure( @Name( value = "resultCount", defaultValue = "4" ) long resultCount ) throws Exception
{
Stream<Output> stream = Stream.iterate( 1L, i -> i + 1 ).limit( resultCount ).map( Output::new );
stream.onClose( () -> {
counters.closeCountTestOnCloseFailingResourceProcedure++;
throw new SimulateFailureOnCloseException();
} );
counters.openCountTestOnCloseFailingResourceProcedure++;
return stream;
}
@UserFunction( name = "org.neo4j.test.fail" )
@Description( "org.neo4j.test.fail" )
public String fail( @Name( value = "input" ) String input )
{
throw new SimulateFailureException();
}
}