Add support for microseconds using TIME.

Closes #526.
Original pull request: #526.

Author: mp911de

src/main/java/org/springframework/data/redis/connection/DefaultStringRedisConnection.java

@@ -3353,6 +3353,15 @@ public Long time() {
 		return convertAndReturn(this.delegate.time(), Converters.identityConverter());
 	}
 
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.redis.connection.RedisServerCommands#time(TimeUnit)
+	 */
+	@Override
+	public Long time(TimeUnit timeUnit) {
+		return convertAndReturn(this.delegate.time(timeUnit), Converters.identityConverter());
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see org.springframework.data.redis.connection.StringRedisConnection#getClientList()

src/main/java/org/springframework/data/redis/connection/DefaultedRedisClusterConnection.java

@@ -18,6 +18,7 @@
 import java.util.Collection;
 import java.util.List;
 import java.util.Properties;
+import java.util.concurrent.TimeUnit;
 
 import org.springframework.data.redis.core.types.RedisClientInfo;
 import org.springframework.lang.Nullable;
@@ -128,6 +129,13 @@ default Long time(RedisClusterNode node) {
 		return serverCommands().time(node);
 	}
 
+	/** @deprecated in favor of {@link RedisConnection#serverCommands()}. */
+	@Override
+	@Deprecated
+	default Long time(RedisClusterNode node, TimeUnit timeUnit) {
+		return serverCommands().time(node, timeUnit);
+	}
+
 	/** @deprecated in favor of {@link RedisConnection#serverCommands()}. */
 	@Override
 	@Deprecated

src/main/java/org/springframework/data/redis/connection/DefaultedRedisConnection.java

@@ -1437,6 +1437,13 @@ default Long time() {
 		return serverCommands().time();
 	}
 
+	/** @deprecated in favor of {@link RedisConnection#serverCommands()}. */
+	@Override
+	@Deprecated
+	default Long time(TimeUnit timeUnit) {
+		return serverCommands().time(timeUnit);
+	}
+
 	/** @deprecated in favor of {@link RedisConnection#serverCommands()}. */
 	@Override
 	@Deprecated

src/main/java/org/springframework/data/redis/connection/ReactiveServerCommands.java

@@ -19,6 +19,7 @@
 import reactor.core.publisher.Mono;
 
 import java.util.Properties;
+import java.util.concurrent.TimeUnit;
 
 import org.springframework.data.redis.core.types.RedisClientInfo;
 
@@ -142,12 +143,24 @@ public interface ReactiveServerCommands {
 	Mono<String> resetConfigStats();
 
 	/**
-	 * Request server timestamp using {@code TIME} command.
+	 * Request server timestamp using {@code TIME} command in {@link TimeUnit#MILLISECONDS}.
 	 *
 	 * @return {@link Mono} wrapping current server time in milliseconds.
 	 * @see <a href="https://redis.io/commands/time">Redis Documentation: TIME</a>
 	 */
-	Mono<Long> time();
+	default Mono<Long> time() {
+		return time(TimeUnit.MILLISECONDS);
+	}
+
+	/**
+	 * Request server timestamp using {@code TIME} command.
+	 *
+	 * @param timeUnit target unit.
+	 * @return {@link Mono} wrapping current server time in {@link TimeUnit}.
+	 * @since 2.5
+	 * @see <a href="https://redis.io/commands/time">Redis Documentation: TIME</a>
+	 */
+	Mono<Long> time(TimeUnit timeUnit);
 
 	/**
 	 * Closes a given client connection identified by {@literal host:port}.

src/main/java/org/springframework/data/redis/connection/RedisClusterServerCommands.java

@@ -17,6 +17,7 @@
 
 import java.util.List;
 import java.util.Properties;
+import java.util.concurrent.TimeUnit;
 
 import org.springframework.data.redis.core.types.RedisClientInfo;
 
@@ -118,7 +119,18 @@ public interface RedisClusterServerCommands extends RedisServerCommands {
 	 * @return
 	 * @see RedisServerCommands#time()
 	 */
-	Long time(RedisClusterNode node);
+	default Long time(RedisClusterNode node) {
+		return time(node, TimeUnit.MILLISECONDS);
+	}
+
+	/**
+	 * @param node must not be {@literal null}.
+	 * @param timeUnit must not be {@literal null}.
+	 * @return
+	 * @since 2.5
+	 * @see RedisServerCommands#time(TimeUnit)
+	 */
+	Long time(RedisClusterNode node, TimeUnit timeUnit);
 
 	/**
 	 * @param node must not be {@literal null}.

src/main/java/org/springframework/data/redis/connection/RedisServerCommands.java

@@ -17,6 +17,7 @@
 
 import java.util.List;
 import java.util.Properties;
+import java.util.concurrent.TimeUnit;
 
 import org.springframework.data.redis.core.types.RedisClientInfo;
 import org.springframework.lang.Nullable;
@@ -174,14 +175,27 @@ default void bgWriteAof() {
 	void resetConfigStats();
 
 	/**
-	 * Request server timestamp using {@code TIME} command.
+	 * Request server timestamp using {@code TIME} command in {@link TimeUnit#MILLISECONDS}.
 	 *
 	 * @return current server time in milliseconds or {@literal null} when used in pipeline / transaction.
 	 * @since 1.1
 	 * @see <a href="https://redis.io/commands/time">Redis Documentation: TIME</a>
 	 */
 	@Nullable
-	Long time();
+	default Long time() {
+		return time(TimeUnit.MILLISECONDS);
+	}
+
+	/**
+	 * Request server timestamp using {@code TIME} command.
+	 *
+	 * @param timeUnit target unit.
+	 * @return current server time in {@link TimeUnit} or {@literal null} when used in pipeline / transaction.
+	 * @since 2.5
+	 * @see <a href="https://redis.io/commands/time">Redis Documentation: TIME</a>
+	 */
+	@Nullable
+	Long time(TimeUnit timeUnit);
 
 	/**
 	 * Closes a given client connection identified by {@literal host:port}.

src/main/java/org/springframework/data/redis/connection/convert/Converters.java

@@ -207,6 +207,23 @@ public static Long toTimeMillis(String seconds, String microseconds) {
 				+ NumberUtils.parseNumber(microseconds, Long.class) / 1000L;
 	}
 
+	/**
+	 * Returns the timestamp constructed from the given {@code seconds} and {@code microseconds}.
+	 *
+	 * @param seconds server time in seconds.
+	 * @param microseconds elapsed microseconds in current second.
+	 * @param unit target unit.
+	 * @return
+	 * @since 2.5
+	 */
+	public static Long toTimeMillis(String seconds, String microseconds, TimeUnit unit) {
+
+		long secondValue = TimeUnit.SECONDS.toMicros(NumberUtils.parseNumber(seconds, Long.class));
+		long microValue = NumberUtils.parseNumber(microseconds, Long.class);
+
+		return unit.convert(secondValue + microValue, TimeUnit.MICROSECONDS);
+	}
+
 	/**
 	 * Converts {@code seconds} to the given {@link TimeUnit}.
 	 *

src/main/java/org/springframework/data/redis/connection/jedis/JedisClusterServerCommands.java

@@ -24,6 +24,7 @@
 import java.util.List;
 import java.util.Map.Entry;
 import java.util.Properties;
+import java.util.concurrent.TimeUnit;
 
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.data.redis.connection.ClusterCommandExecutor.MultiNodeResult;
@@ -391,24 +392,26 @@ public void resetConfigStats(RedisClusterNode node) {
 
 	/*
 	 * (non-Javadoc)
-	 * @see org.springframework.data.redis.connection.RedisServerCommands#time()
+	 * @see org.springframework.data.redis.connection.RedisServerCommands#time(TimeUnit)
 	 */
 	@Override
-	public Long time() {
+	public Long time(TimeUnit timeUnit) {
 
 		return convertListOfStringToTime(connection.getClusterCommandExecutor()
-				.executeCommandOnArbitraryNode((JedisClusterCommandCallback<List<String>>) BinaryJedis::time).getValue());
+				.executeCommandOnArbitraryNode((JedisClusterCommandCallback<List<String>>) BinaryJedis::time).getValue(),
+				timeUnit);
 	}
 
 	/*
 	 * (non-Javadoc)
-	 * @see org.springframework.data.redis.connection.RedisClusterServerCommands#time(org.springframework.data.redis.connection.RedisClusterNode)
+	 * @see org.springframework.data.redis.connection.RedisClusterServerCommands#time(org.springframework.data.redis.connection.RedisClusterNode, TimeUnit)
 	 */
 	@Override
-	public Long time(RedisClusterNode node) {
+	public Long time(RedisClusterNode node, TimeUnit timeUnit) {
 
 		return convertListOfStringToTime(connection.getClusterCommandExecutor()
-				.executeCommandOnSingleNode((JedisClusterCommandCallback<List<String>>) BinaryJedis::time, node).getValue());
+				.executeCommandOnSingleNode((JedisClusterCommandCallback<List<String>>) BinaryJedis::time, node).getValue(),
+				timeUnit);
 	}
 
 	/*
@@ -517,13 +520,13 @@ public void migrate(byte[] key, RedisNode target, int dbIndex, @Nullable Migrate
 				node);
 	}
 
-	private Long convertListOfStringToTime(List<String> serverTimeInformation) {
+	private Long convertListOfStringToTime(List<String> serverTimeInformation, TimeUnit timeUnit) {
 
 		Assert.notEmpty(serverTimeInformation, "Received invalid result from server. Expected 2 items in collection.");
 		Assert.isTrue(serverTimeInformation.size() == 2,
 				"Received invalid number of arguments from redis server. Expected 2 received " + serverTimeInformation.size());
 
-		return Converters.toTimeMillis(serverTimeInformation.get(0), serverTimeInformation.get(1));
+		return Converters.toTimeMillis(serverTimeInformation.get(0), serverTimeInformation.get(1), timeUnit);
 	}
 
 	private <T> NodeResult<T> executeCommandOnSingleNode(JedisClusterCommandCallback<T> cmd, RedisClusterNode node) {

src/main/java/org/springframework/data/redis/connection/jedis/JedisConverters.java

@@ -547,13 +547,14 @@ public static ScanParams toScanParams(ScanOptions options) {
 		return sp;
 	}
 
-	static Long toTime(List<String> source) {
+	static Long toTime(List<String> source, TimeUnit timeUnit) {
 
 		Assert.notEmpty(source, "Received invalid result from server. Expected 2 items in collection.");
 		Assert.isTrue(source.size() == 2,
 				"Received invalid nr of arguments from redis server. Expected 2 received " + source.size());
+		Assert.notNull(timeUnit, "TimeUnit must not be null.");
 
-		return toTimeMillis(source.get(0), source.get(1));
+		return toTimeMillis(source.get(0), source.get(1), timeUnit);
 	}
 
 	/**

src/main/java/org/springframework/data/redis/connection/jedis/JedisServerCommands.java

@@ -21,6 +21,7 @@
 
 import java.util.List;
 import java.util.Properties;
+import java.util.concurrent.TimeUnit;
 
 import org.springframework.data.redis.connection.RedisNode;
 import org.springframework.data.redis.connection.RedisServerCommands;
@@ -190,12 +191,15 @@ public void resetConfigStats() {
 
 	/*
 	 * (non-Javadoc)
-	 * @see org.springframework.data.redis.connection.RedisServerCommands#time()
+	 * @see org.springframework.data.redis.connection.RedisServerCommands#time(TimeUnit)
 	 */
 	@Override
-	public Long time() {
+	public Long time(TimeUnit timeUnit) {
+
+		Assert.notNull(timeUnit, "TimeUnit must not be null.");
+
 		return connection.invoke().from(BinaryJedis::time, MultiKeyPipelineBase::time)
-				.get(JedisConverters::toTime);
+				.get((List<String> source) -> JedisConverters.toTime(source, timeUnit));
 	}
 
 	/*