DATAREDIS-1084 - Add support for XCLAIM.

Original pull request: spring-projects#512.

Author: christophstrobl

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

@@ -3651,6 +3651,24 @@ public RecordId xAdd(StringRecord record) {
 return convertAndReturn(delegate.xAdd(record.serialize(serializer)), identityConverter);
 }
 
+/*
+ * (non-Javadoc)
+ * @see org.springframework.data.redis.connection.StringRedisConnection#xClaimJustId(java.lang.String, java.lang.String, java.lang.String, org.springframework.data.redis.connection.RedisStreamCommands.XClaimOptions)
+ */
+@Override
+public List<RecordId> xClaimJustId(String key, String group, String consumer, XClaimOptions options) {
+return convertAndReturn(delegate.xClaimJustId(serialize(key), group, consumer, options), identityConverter);
+}
+
+/*
+ * (non-Javadoc)
+ * @see org.springframework.data.redis.connection.StringRedisConnection#xClaim(java.lang.String, java.lang.String, java.lang.String, org.springframework.data.redis.connection.RedisStreamCommands.XClaimOptions)
+ */
+@Override
+public List<StringRecord> xClaim(String key, String group, String consumer, XClaimOptions options) {
+return convertAndReturn(delegate.xClaim(serialize(key), group, consumer, options), listByteMapRecordToStringMapRecordConverter);
+}
+
 /*
  * (non-Javadoc)
  * @see org.springframework.data.redis.connection.StringRedisConnection#xDel(java.lang.String, java.lang.String[])
@@ -3803,6 +3821,24 @@ public RecordId xAdd(MapRecord<byte[], byte[], byte[]> record) {
 return delegate.xAdd(record);
 }
 
+/*
+ * (non-Javadoc)
+ * @see org.springframework.data.redis.connection.RedisStreamCommands#xClaimJustId(byte[], java.lang.String, java.lag.String, org.springframework.data.redis.connection.RedisStreamCommands.XCLaimOptions)
+ */
+@Override
+public List<RecordId> xClaimJustId(byte[] key, String group, String newOwner, XClaimOptions options) {
+return delegate.xClaimJustId(key, group, newOwner, options);
+}
+
+/*
+ * (non-Javadoc)
+ * @see org.springframework.data.redis.connection.RedisStreamCommands#xClaim(byte[], java.lang.String, java.lag.String, org.springframework.data.redis.connection.RedisStreamCommands.XCLaimOptions)
+ */
+@Override
+public List<ByteRecord> xClaim(byte[] key, String group, String newOwner, XClaimOptions options) {
+return delegate.xClaim(key, group, newOwner, options);
+}
+
 /*
  * (non-Javadoc)
  * @see org.springframework.data.redis.connection.RedisStreamCommands#xDel(byte[], RecordId)

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

@@ -453,6 +453,20 @@ default RecordId xAdd(MapRecord<byte[], byte[], byte[]> record) {
 return streamCommands().xAdd(record);
 }
 
+/** @deprecated in favor of {@link RedisConnection#streamCommands()}}. */
+@Override
+@Deprecated
+default List<RecordId> xClaimJustId(byte[] key, String group, String newOwner, XClaimOptions options) {
+return streamCommands().xClaimJustId(key, group, newOwner, options);
+}
+
+/** @deprecated in favor of {@link RedisConnection#streamCommands()}}. */
+@Override
+@Deprecated
+default List<ByteRecord> xClaim(byte[] key, String group, String newOwner, XClaimOptions options) {
+return streamCommands().xClaim(key, group, newOwner, options);
+}
+
 /** @deprecated in favor of {@link RedisConnection#streamCommands()}}. */
 @Override
 @Deprecated

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

@@ -19,6 +19,7 @@
 import reactor.core.publisher.Mono;
 
 import java.nio.ByteBuffer;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -30,6 +31,7 @@
 import org.springframework.data.redis.connection.ReactiveRedisConnection.CommandResponse;
 import org.springframework.data.redis.connection.ReactiveRedisConnection.KeyCommand;
 import org.springframework.data.redis.connection.ReactiveRedisConnection.NumericResponse;
+import org.springframework.data.redis.connection.RedisStreamCommands.XClaimOptions;
 import org.springframework.data.redis.connection.RedisStreamCommands.XPendingOptions;
 import org.springframework.data.redis.connection.RedisZSetCommands.Limit;
 import org.springframework.data.redis.connection.stream.ByteBufferRecord;
@@ -285,6 +287,112 @@ default Mono<RecordId> xAdd(ByteBufferRecord record) {
  */
 Flux<CommandResponse<AddStreamRecord, RecordId>> xAdd(Publisher<AddStreamRecord> commands);
 
+/**
+ * Change the ownership of a pending message to the given new {@literal consumer} without increasing the delivered
+ * count.
+ *
+ * @param key the {@literal key} the stream is stored at.
+ * @param group the name of the {@literal consumer group}.
+ * @param newOwner the name of the new {@literal consumer}.
+ * @param options must not be {@literal null}.
+ * @return a {@link Flux} emitting {@link RecordId is} that changed user.
+ * @see <a href="https://redis.io/commands/xclaim">Redis Documentation: XCLAIM</a>
+ * @since 2.3
+ */
+default Flux<RecordId> xClaimJustId(ByteBuffer key, String group, String newOwner, XClaimOptions options) {
+
+return xClaimJustId(Mono.just(new XClaimCommand(key, group, newOwner, options))).next()
+.flatMapMany(CommandResponse::getOutput);
+}
+
+/**
+ * Change the ownership of a pending message to the given new {@literal consumer} without increasing the delivered
+ * count.
+ *
+ * @param commands must not be {@literal null}.
+ * @return a {@link Flux} emitting {@link RecordId is} that changed user.
+ * @see <a href="https://redis.io/commands/xclaim">Redis Documentation: XCLAIM</a>
+ * @since 2.3
+ */
+Flux<CommandResponse<XClaimCommand, Flux<RecordId>>> xClaimJustId(Publisher<XClaimCommand> commands);
+
+/**
+ * Change the ownership of a pending message to the given new {@literal consumer}.
+ *
+ * @param key the {@literal key} the stream is stored at.
+ * @param group the name of the {@literal consumer group}.
+ * @param newOwner the name of the new {@literal consumer}.
+ * @param minIdleTime must not be {@literal null}.
+ * @param recordIds must not be {@literal null}.
+ * @return a {@link Flux} emitting {@link ByteBufferRecord} that changed user.
+ * @see <a href="https://redis.io/commands/xclaim">Redis Documentation: XCLAIM</a>
+ * @since 2.3
+ */
+default Flux<ByteBufferRecord> xClaim(ByteBuffer key, String group, String newOwner, Duration minIdleTime,
+RecordId... recordIds) {
+
+return xClaim(key, group, newOwner, XClaimOptions.minIdle(minIdleTime).ids(recordIds));
+}
+
+/**
+ * Change the ownership of a pending message to the given new {@literal consumer}.
+ *
+ * @param key the {@literal key} the stream is stored at.
+ * @param group the name of the {@literal consumer group}.
+ * @param newOwner the name of the new {@literal consumer}.
+ * @param options must not be {@literal null}.
+ * @return a {@link Flux} emitting {@link ByteBufferRecord} that changed user.
+ * @see <a href="https://redis.io/commands/xclaim">Redis Documentation: XCLAIM</a>
+ * @since 2.3
+ */
+default Flux<ByteBufferRecord> xClaim(ByteBuffer key, String group, String newOwner, XClaimOptions options) {
+
+return xClaim(Mono.just(new XClaimCommand(key, group, newOwner, options))).next()
+.flatMapMany(CommandResponse::getOutput);
+}
+
+/**
+ * Change the ownership of a pending message to the given new {@literal consumer}.
+ * 
+ * @param commands must not be {@literal null}.
+ * @return
+ * @see <a href="https://redis.io/commands/xclaim">Redis Documentation: XCLAIM</a>
+ * @since 2.3
+ */
+Flux<CommandResponse<XClaimCommand, Flux<ByteBufferRecord>>> xClaim(Publisher<XClaimCommand> commands);
+
+/**
+ * {@code XCLAIM} command parameters.
+ *
+ * @see <a href="https://redis.io/commands/xclaim">Redis Documentation: XCLAIM</a>
+ */
+class XClaimCommand extends KeyCommand {
+
+private final String groupName;
+private final String consumerName;
+private final XClaimOptions options;
+
+private XClaimCommand(@Nullable ByteBuffer key, String groupName, String consumerName, XClaimOptions options) {
+
+super(key);
+this.groupName = groupName;
+this.consumerName = consumerName;
+this.options = options;
+}
+
+public XClaimOptions getOptions() {
+return options;
+}
+
+public String getConsumerName() {
+return consumerName;
+}
+
+public String getGroupName() {
+return groupName;
+}
+}
+
 /**
  * {@code XDEL} command parameters.
  *