Make Long and Double test factories return unique vals

Random was returning the same value multiple times,
causing issues with Set tests

src/test/java/org/springframework/data/redis/DoubleAsStringObjectFactory.java

@@ -15,20 +15,21 @@
  */
 package org.springframework.data.redis;
 
-import java.util.Random;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
  *
- * Implementation of {@link ObjectFactory that returns random Doubles as Strings
+ * Implementation of {@link ObjectFactory} that returns unique Doubles as Strings,
+ * incrementing by 1 each time
  * @author Jennifer Hickey
  *
  */
 public class DoubleAsStringObjectFactory implements ObjectFactory<String> {
 
-	private Random random = new Random(System.currentTimeMillis());
+	private AtomicLong counter = new AtomicLong();
 
 	public String instance() {
-		return String.valueOf(random.nextDouble());
+		return String.valueOf(Double.valueOf(counter.getAndIncrement()));
 	}
 
 }

src/test/java/org/springframework/data/redis/DoubleObjectFactory.java

@@ -15,23 +15,20 @@
  */
 package org.springframework.data.redis;
 
-import java.text.DecimalFormat;
-import java.util.Random;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
- * Returns random Doubles
+ * Returns unique Doubles, incrementing by 1 each time
  *
  * @author Jennifer Hickey
  *
  */
 public class DoubleObjectFactory implements ObjectFactory<Double> {
 
-	private Random random = new Random(System.currentTimeMillis());
-
-	private static final DecimalFormat TWO_D_FORM = new DecimalFormat("#.##");
+	private AtomicLong counter = new AtomicLong();
 
 	public Double instance() {
-		return Double.valueOf(TWO_D_FORM.format(random.nextDouble()));
+		return Double.valueOf(counter.getAndIncrement());
 	}
 
 }

src/test/java/org/springframework/data/redis/LongAsStringObjectFactory.java

@@ -15,20 +15,20 @@
  */
 package org.springframework.data.redis;
 
-import java.util.Random;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
 *
-* Implementation of {@link ObjectFactory that returns random Longs as Strings
+* Implementation of {@link ObjectFactory} that returns unique incremented Longs as Strings
 * @author Jennifer Hickey
 *
 */
 public class LongAsStringObjectFactory implements ObjectFactory<String> {
 
-	private Random random = new Random(System.currentTimeMillis());
+	private AtomicLong counter = new AtomicLong();
 
 	public String instance() {
-		return String.valueOf(random.nextLong());
+		return String.valueOf(counter.getAndIncrement());
 	}
 
 }

src/test/java/org/springframework/data/redis/LongObjectFactory.java

@@ -15,20 +15,20 @@
  */
 package org.springframework.data.redis;
 
-import java.util.Random;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
- * Returns random Longs
+ * Returns unique Longs by incrementing a counter each time
  *
  * @author Jennifer Hickey
  *
  */
 public class LongObjectFactory implements ObjectFactory<Long> {
 
-	private Random random = new Random(System.currentTimeMillis());
+	private AtomicLong counter = new AtomicLong();
 
 	public Long instance() {
-		return random.nextLong();
+		return counter.getAndIncrement();
 	}
 
 }