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Yanbiao Li, 01/09/2018 01:39 PM
Content Store Management¶
Content Store Management is a module of NFD Management protocol.
It provides commands and datasets about the Content Store and its usage in forwarding.
Content Store Management commands and datasets are available under namespace ndn:/localhost/nfd/cs.
Control Commands¶
ControlCommand management-module: cs
Update config¶
command-verb: config
This command updates CS configuration.
To discover the current configuration, either retrieve the CS Information Dataset, or send an empty config command.
ControlParameters fields:
- Capacity (optional)
- Flags (optional)
- Mask (optional)
Capacity indicates the maximum number of CS entries.
If this field is omitted, the capacity is left unchanged.
Flags is an inclusive OR of CS enablement flags.
1=CS_ENABLE_ADMIT, enables the CS to admit new Data.
2=CS_ENABLE_SERVE, enables the CS to satisfy Interests using cached Data.
The initial value of the CS is CS_ENABLE_ADMIT | CS_ENABLE_SERVE.
If this field is omitted, the enablement settings are left unchanged.
Mask field indicates what flags are being updated.
The default is 0xFFFFFFFF, updating all flags.
If all fields are omitted, the command has no effect but is still considered successful.
If the command succeeds, <Body> in ControlResponse block contains updated ControlParameters reflecting current configuration:
- Capacity (required)
- Flags (required)
Note to future protocol designers: when the CS is extended to have multiple storage tiers (such as RAM and SSD), ControlParameter shall have an optional Name field to indicate the storage tier being configured.
Erase entry¶
command-verb: erase
(to be defined in #4318)
CS Information Dataset¶
CS config and runtime performance are published as a Status Dataset at ndn:/localhost/nfd/cs/info.
CsInfo ::= CS-INFO-TYPE TLV-LENGTH
Capacity
Flags
NHits
NMisses
(TLVs have nonNegativeInteger as value)
Note to future protocol designers: in CsInfo element, fields that reflect configuration shall be placed before fields that reflect runtime counters.
Note to future protocol designers: when the CS is extended to have multiple storage tiers (such as RAM and SSD), each storage tier shall have separate counters, multiple CsInfo elements appear in the dataset and each has a Name field as the first child to indicate the storage tier.
CS Enumeration¶
A subset of CS entries can be queried into a Status Dataset under ndn:/localhost/nfd/cs/query.
CsQuery ::= CS-QUERY-TYPE TLV-LENGTH
Name
PacketSize
FreshnessPeriod
(TLVs have nonNegativeInteger as value)
TLV-TYPE assignments¶
| Type | Assigned number | Assigned number (hex) |
|---|---|---|
| CsInfo | 128 | 0x80 |
| Capacity | 131 | 0x83 |
| Flags | 108 | 0x6c |
| NHits | 129 | 0x81 |
| NMisses | 130 | 0x82 |
Updated by Yanbiao Li almost 7 years ago · 19 revisions