neograph::graph::Channel Struct Reference

A state channel that holds a reducer, lifecycle policy, and version. More...

#include <types.h>

Public Attributes
ChannelLifecyclePolicy	lifecycle
	Retention and persistence policy.
std::string	name
	Channel name.
ReducerFn	reducer
	Custom reducer (when type == CUSTOM).
ReducerType	reducer_type = ReducerType::OVERWRITE
	Merge strategy.
json	value
	Current channel value.
uint64_t	version = 0
	Value of the state's single write counter (GraphState::global_version) at this channel's last write; 0 until the channel is written.

Detailed Description

A state channel that holds a reducer, lifecycle policy, and version.

Combination (reducer_type/reducer) happens first. Retention then normalizes the combined value, and persistence controls checkpoint projection. Keeping those stages explicit avoids conflating "append" with "keep forever" or "persist".

Definition at line 113 of file types.h.

Member Data Documentation

version

uint64_t neograph::graph::Channel::version = 0

Value of the state's single write counter (GraphState::global_version) at this channel's last write; 0 until the channel is written.

Every channel shares the counter, so this is not a count of this channel's writes.

Definition at line 122 of file types.h.

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The documentation for this struct was generated from the following file:

• include/neograph/graph/types.h