database_writer.h File Reference

Concrete BagWriter implementation for the SQLite-backed VLink bag format. More...

#include <memory>
#include <string>
#include "./bag_writer.h"

Include dependency graph for database_writer.h:

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Classes
class	vlink::DatabaseWriter
	Concrete SQLite-backed bag file recorder with transactional write caching. More...

Namespaces
namespace	vlink

Detailed Description

Concrete BagWriter implementation for the SQLite-backed VLink bag format.

DatabaseWriter records VLink messages to a SQLite .vdb file. It extends BagWriter with transactional write caching (WAL mode, batch commit), optional VACUUM optimisation on exit, and in-place schema embedding for Protobuf introspection.

Internally, messages are accumulated in a memory cache and committed in batches to reduce SQLite write overhead. Cache parameters are configurable via BagWriter::Config.

Usage

vlink::BagWriter::Config cfg;
cfg.compress = vlink::BagWriter::kCompressLzav;
cfg.wal_mode = true;
 
auto writer = vlink::BagWriter::create("/data/recording.vdb", cfg);
// or explicitly:
auto writer = std::make_shared<vlink::DatabaseWriter>("/data/recording.vdb", cfg);
writer->async_run();
writer->push("dds://my/topic", "demo.proto.PointCloud", vlink::SchemaType::kProtobuf,
             vlink::ActionType::kPublish, data);

See also

BagWriter, McapWriter