Examples with JsonMetadata oap.storage.migration.JsonMetadata used on opensource projects

Example 1 with JsonMetadata

use of oap.storage.migration.JsonMetadata in project oap by oaplatform.

the class FsPersistenceBackend method migration.

@SneakyThrows
private Path migration(Path path) {
    return Threads.synchronously(lock, () -> {
        JsonMetadata oldV = new JsonMetadata(Binder.json.unmarshal(new TypeReference<Map<String, Object>>() {
        }, path));
        Persisted fn = Persisted.valueOf(path);
        log.debug("migration {}", fn);
        val migration = Lists.find2(migrations, m -> m.fromVersion() == fn.version);
        if (migration == null)
            throw new FileStorageMigrationException("migration from version " + fn + " not found");
        Path name = fn.toVersion(migration.fromVersion() + 1);
        JsonMetadata newV = migration.run(oldV);
        long writeLen = -1;
        while (name.toFile().length() != writeLen) {
            try (val out = new CountingOutputStream(IoStreams.out(name, PLAIN, DEFAULT_BUFFER, false, true))) {
                Binder.json.marshal(out, newV.underlying);
                writeLen = out.getCount();
            }
        }
        Files.delete(path);
        return name;
    });
}