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11.6.7. Hot Rod GetWithMetadata Operation
A Hot Rod
GetWithMetadata operation uses the following request format:
| Field | Data Type | Details |
|---|---|---|
| Header | variable | Request header. |
| Key Length | vInt | Length of key. Note that the size of a vInt can be up to five bytes, which theoretically can produce bigger numbers than Integer.MAX_VALUE. However, Java cannot create a single array that is bigger than Integer.MAX_VALUE, hence the protocol limits vInt array lengths to Integer.MAX_VALUE. |
| Key | byte array | Byte array containing the key whose value is being requested. |
The response header for this operation contains one of the following response statuses:
| Field | Data Type | Details |
|---|---|---|
| Header | variable | Response header. |
| Response status | 1 byte | 0x00 = success, if key retrieved.
0x02 = if key does not exist.
|
| Flag | 1 byte | A flag indicating whether the response contains expiration information. The value of the flag is obtained as a bitwise OR operation between INFINITE_LIFESPAN (0x01) and INFINITE_MAXIDLE (0x02). |
| Created | Long | (optional) a Long representing the timestamp when the entry was created on the server. This value is returned only if the flag's INFINITE_LIFESPAN bit is not set. |
| Lifespan | vInt | (optional) a vInt representing the lifespan of the entry in seconds. This value is returned only if the flag's INFINITE_LIFESPAN bit is not set. |
| LastUsed | Long | (optional) a Long representing the timestamp when the entry was last accessed on the server. This value is returned only if the flag's INFINITE_MAXIDLE bit is not set. |
| MaxIdle | vInt | (optional) a vInt representing the maxIdle of the entry in seconds. This value is returned only if the flag's INFINITE_MAXIDLE bit is not set. |
| Entry Version | 8 bytes | Unique value of an existing entry modification. The protocol does not mandate that entry_version values are sequential, however they need to be unique per update at the key level. |
| Value Length | vInt | If success, length of value. |
| Value | byte array | If success, the requested value. |
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