Add incrementScore to RedisZSet

Adds a method to increment the score of an element in RedisZSet.

Signed-off-by: vinsguru <vino.infy@gmail.com>

Author: vinsguru

src/main/java/org/springframework/data/redis/support/collections/DefaultRedisZSet.java

@@ -39,6 +39,7 @@
  * @author Christoph Strobl
  * @author Mark Paluch
  * @author Andrey Shlykov
+ * @author Vinoth Selvaraj
  */
 public class DefaultRedisZSet<E> extends AbstractRedisCollection<E> implements RedisZSet<E> {
 
@@ -455,6 +456,11 @@ public Double score(Object o) {
 		return boundZSetOps.score(o);
 	}
 
+	@Override
+	public Double incrementScore(E e, double increment) {
+		return boundZSetOps.incrementScore(e, increment);
+	}
+
 	@Override
 	public DataType getType() {
 		return DataType.ZSET;

src/main/java/org/springframework/data/redis/support/collections/RedisZSet.java

@@ -41,6 +41,7 @@
  * @author Mark Paluch
  * @author Christoph Strobl
  * @author Andrey Shlykov
+ * @author Vinoth Selvaraj
  */
 public interface RedisZSet<E> extends RedisCollection<E>, Set<E> {
 
@@ -564,6 +565,18 @@ default boolean addIfAbsent(E e) {
 	 */
 	Double score(Object o);
 
+	/**
+	 * Increments the score of the given element by the specified {@code increment}.
+	 * <p>
+	 * If the element does not exist in the sorted set, it will be added with the specified increment as its initial score.
+	 *
+	 * @param e the element whose score to increment, must not be {@literal null}.
+	 * @param increment the value by which the score should be increased.
+	 * @return the new score after incrementing
+	 * @see <a href="https://redis.io/commands/zincrby">Redis Documentation: ZINCRBY</a>
+	 */
+	Double incrementScore(E e, double increment);
+
 	/**
 	 * Returns the rank (position) of the given element in the set, in ascending order. Returns null if the element is not
 	 * contained by the set.

src/test/java/org/springframework/data/redis/support/collections/AbstractRedisZSetTestIntegration.java

@@ -54,6 +54,7 @@
  * @author Mark Paluch
  * @author Andrey Shlykov
  * @author Christoph Strobl
+ * @author Vinoth Selvaraj
  */
 public abstract class AbstractRedisZSetTestIntegration<T> extends AbstractRedisCollectionIntegrationTests<T> {
 
@@ -297,6 +298,29 @@ void testScore() {
 		assertThat(zSet.score(t3)).isEqualTo(Double.valueOf(5));
 	}
 
+	@Test // DATAREDIS-3256
+	void testIncrementScore() {
+		RedisZSet<T> set = createZSetFor("test:zset:increment");
+		T t1 = getT();
+		T t2 = getT();
+		T t3 = getT(); // new member for creation test
+
+		set.add(t1, 3);
+		set.add(t2, 4);
+
+		// existing members
+		set.incrementScore(t1, 5);
+		set.incrementScore(t2, -2);
+
+		assertThat(set.score(t1)).isEqualTo(Double.valueOf(8));
+		assertThat(set.score(t2)).isEqualTo(Double.valueOf(2));
+
+		// new member (absent before)
+		Double newScore = set.incrementScore(t3, 7);
+		assertThat(newScore).isEqualTo(Double.valueOf(7));
+		assertThat(set.score(t3)).isEqualTo(Double.valueOf(7));
+	}
+
 	@Test
 	void testDefaultScore() {
 		assertThat(zSet.getDefaultScore()).isCloseTo(1, Offset.offset(0d));