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RandomRule.java
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RandomRule.java
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/*
* Copyright (c) 2002-2017 "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.test.rule;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.util.Random;
import org.neo4j.helpers.Exceptions;
import org.neo4j.test.Randoms;
import org.neo4j.test.Randoms.Configuration;
import static java.lang.System.currentTimeMillis;
/**
* Like a {@link Random} but guarantees to include the seed with the test failure, which helps
* greatly in debugging.
*
* Available methods directly on this class include those found in {@link Randoms} and the basic ones in {@link Random}.
*/
public class RandomRule implements TestRule
{
private long seed;
private Random random;
private Randoms randoms;
private Configuration config = Randoms.DEFAULT;
public RandomRule withConfiguration( Randoms.Configuration config )
{
this.config = config;
return this;
}
@Override
public Statement apply( final Statement base, Description description )
{
return new Statement()
{
@Override
public void evaluate() throws Throwable
{
Seed methodSeed = description.getAnnotation( Seed.class );
if ( methodSeed != null )
{
seed = methodSeed.value();
}
else
{
seed = currentTimeMillis();
}
reset();
try
{
base.evaluate();
}
catch ( Throwable t )
{
throw Exceptions.withMessage( t, t.getMessage() + ": random seed used:" + seed );
}
}
};
}
// ============================
// Methods from Random
// ============================
public void nextBytes( byte[] bytes )
{
random.nextBytes( bytes );
}
public boolean nextBoolean()
{
return random.nextBoolean();
}
public double nextDouble()
{
return random.nextDouble();
}
public float nextFloat()
{
return random.nextFloat();
}
public int nextInt()
{
return random.nextInt();
}
public int nextInt( int n )
{
return random.nextInt( n );
}
public int nextInt( int origin, int bound )
{
return random.nextInt( (bound - origin) + 1 ) + origin;
}
public double nextGaussian()
{
return random.nextGaussian();
}
public long nextLong()
{
return random.nextLong();
}
public long nextLong( long n )
{
return Math.abs( nextLong() ) % n;
}
public long nextLong( long origin, long bound )
{
return nextLong( (bound - origin) + 1L ) + origin;
}
// ============================
// Methods from Randoms
// ============================
public int intBetween( int min, int max )
{
return randoms.intBetween( min, max );
}
public String string()
{
return randoms.string();
}
public String string( int minLength, int maxLength, int characterSets )
{
return randoms.string( minLength, maxLength, characterSets );
}
public char character( int characterSets )
{
return randoms.character( characterSets );
}
public <T> T[] selection( T[] among, int min, int max, boolean allowDuplicates )
{
return randoms.selection( among, min, max, allowDuplicates );
}
public <T> T among( T[] among )
{
return randoms.among( among );
}
public Number numberPropertyValue()
{
return randoms.numberPropertyValue();
}
public Object propertyValue()
{
return randoms.propertyValue();
}
// ============================
// Other utility methods
// ============================
public void reset()
{
random = new Random( seed );
randoms = new Randoms( random, config );
}
public Randoms fork( Configuration configuration )
{
return randoms.fork( configuration );
}
public long seed()
{
return seed;
}
public Random random()
{
return random;
}
public Randoms randoms()
{
return randoms;
}
@Retention( RetentionPolicy.RUNTIME )
@Target( ElementType.METHOD )
public @interface Seed
{
long value();
}
}