launchdarkly::client_side::flag_manager::ContextIndex Class Reference

#include <context_index.hpp>

Classes
struct	IndexEntry

Public Types
using	Index = std::vector< IndexEntry >

Public Member Functions
	ContextIndex (Index)
void	Notice (std::string id, std::chrono::time_point< std::chrono::system_clock > timestamp)
Index const &	Entries () const
std::vector< std::string >	Prune (std::size_t maxContexts)

Detailed Description

Used internally to track which contexts have flag data in the persistent store.

This exists because we can't assume that the persistent store mechanism has an "enumerate all the keys that exist under such-and-such prefix" capability, so we need a table of contents at a fixed location. The only information being tracked here is, for each flag data set that exists in storage,

1. a context identifier (hashed fully-qualified key) and
2. timestamp when it was last accessed, to support an LRU eviction pattern.

Member Function Documentation

Notice()

void launchdarkly::client_side::flag_manager::ContextIndex::Notice	(	std::string	id,
		std::chrono::time_point< std::chrono::system_clock >	timestamp
	)

Indicate that a context was accessed. This will add it to the index if it was not already present. If it was present, then it will update the timestamp for the context.

Parameters

id	The id of the context.
timestamp	The time the context is noticed.

Prune()

std::vector< std::string > launchdarkly::client_side::flag_manager::ContextIndex::Prune

(

std::size_t

maxContexts

)

Prune the index returning a list of the removed context keys

Parameters

maxContexts

The maximum number of contexts to retain.

Returns

A list of the contexts that were pruned.

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The documentation for this class was generated from the following files:

• src/flag_manager/context_index.hpp
• src/flag_manager/context_index.cpp