Implements BITFIELD_RO command

[yangbodong22011]

In the redis unstable branch, the bitfield_ro command is added, refer: this .

[sazzad16]

What if there's a new read sub-command for BITFIELD command? So I don't think bitfieldReadonly(T key, T type, T offset) is a good idea. bitfield(T key, T... arguments) bitfieldReadonly(T key, T... arguments) may look ugly, but it's a much safer option.

[yangbodong22011]

What if there's a new read sub-command for BITFIELD command?

Can you give a specific code example?

[sazzad16]

Sorry, there was a typo in my previous comment.

About example, in JedisCommands interface, instead of

List<Long> bitfieldReadonly(String key, String type, String offset);

my suggestion is to use

List<Long> bitfieldReadonly(String key, String... arguments);

[yangbodong22011]

List bitfieldReadonly(String key, String... arguments);

Is this for scalability? Currently bitfield_ro only supports the GET subcommand, So i hardcoded it.

public void bitfieldReadonly(final byte[] key, final byte[] type, final byte[] offset) {
    sendCommand(BITFIELD_RO, key, SafeEncoder.encode("GET"), type, offset);
}

For scalability reasons, I think your suggestion is good.

[sazzad16]

Yes.

[yangbodong22011]

@sazzad16 Thanks，updated.