The key writer to write data elements associated with a given set of keys. More...
#include <DataStorm/DataStorm.h>
Public Member Functions | |
| MultiKeyWriter (const Topic< Key, Value, UpdateTag > &topic, const std::vector< Key > &keys, std::string name=std::string(), const WriterConfig &config=WriterConfig()) | |
| Constructs a new writer for the given keys. | |
| MultiKeyWriter (MultiKeyWriter &&writer) noexcept | |
| Move constructor. | |
| void | add (const Key &key, const Value &value) |
| Adds the data element. | |
| MultiKeyWriter & | operator= (MultiKeyWriter &&writer) noexcept |
| Move assignment operator. | |
| template<typename UpdateValue> | |
| std::function< void(const Key &, const UpdateValue &)> | partialUpdate (const UpdateTag &tag) |
| Gets a partial update generator function for the given partial update tag. | |
| void | remove (const Key &key) noexcept |
| Removes the data element. | |
| void | update (const Key &key, const Value &value) |
| Updates the data element. | |
The key writer to write data elements associated with a given set of keys.
A multi-key writer retains the current value of every key it has written and not since removed, so that later partial updates and late-joining readers can resolve against it. This per-key state is the writer's current data set, not retained history: it is independent of the sampleCount and sampleLifetime history settings, which bound the retained samples but never the current value of a live key. An any-key writer (one constructed with an empty key vector) that writes to an unbounded set of keys therefore accumulates one current value per key; call remove(const Key&) to retire a key and release its state once the key is no longer in use.
Definition at line 808 of file DataStorm.h.
1.17.0 