Package org.infinispan.server.resp.commands.sortedset

Class ZRANDMEMBER

java.lang.Object

org.infinispan.server.resp.RespCommand

org.infinispan.server.resp.commands.sortedset.ZRANDMEMBER

All Implemented Interfaces:

Resp3Command

public class ZRANDMEMBER
extends RespCommand
implements Resp3Command

When called with just the key argument, return a random element from the sorted set value stored at key. If the provided count argument is positive, return an array of distinct elements. The array's length is either count or the sorted set's cardinality (ZCARD), whichever is lower. If called with a negative count, the behavior changes and the command is allowed to return the same element multiple times. In this case, the number of returned elements is the absolute value of the specified count. The optional WITHSCORES modifier changes the reply, so it includes the respective scores of the randomly selected elements from the sorted set.

• Bulk string reply: without the additional count argument, the command returns a Bulk Reply with the randomly selected element, or nil when key does not exist.
• Array reply: when the additional count argument is passed, the command returns an array of elements, or an empty array when key does not exist.

If the WITHSCORES modifier is used, the reply is a list elements and their scores from the sorted set.

Since:

15.0

See Also:

• Redis Documentation

Field Summary

Fields inherited from class org.infinispan.server.resp.RespCommand

log

Constructor Summary

Constructors

Constructor	Description
ZRANDMEMBER()

Method Summary

Modifier and Type	Method	Description
CompletionStage<RespRequestHandler>	perform(Resp3Handler handler, io.netty.channel.ChannelHandlerContext ctx, List<byte[]> arguments)

Methods inherited from class org.infinispan.server.resp.RespCommand

extractKeys, fromByteBuf, getArity, getFirstKeyPos, getLastKeyPos, getName, getSteps, handleException, hasValidNumberOfArguments, match, size, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.infinispan.server.resp.commands.Resp3Command

handleException

Constructor Details

ZRANDMEMBER

public ZRANDMEMBER()

Method Details

perform

public CompletionStage<RespRequestHandler> perform(Resp3Handler handler,
 io.netty.channel.ChannelHandlerContext ctx,
 List<byte[]> arguments)

Specified by:

perform in interface Resp3Command