io.mstream.trader.commons.config.ConfigClient Maven / Gradle / Ivy

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package io.mstream.trader.commons.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import javax.inject.Inject;
import java.util.Optional;


public class ConfigClient {

    private static final Logger LOGGER = LogManager.getLogger();

    private final CuratorFrameworkSupplier curatorSupplier;
    private final ObjectMapper mapper;

    @Inject
    public ConfigClient(
            CuratorFrameworkSupplier curatorSupplier,
            ObjectMapper mapper
    ) {
        this.curatorSupplier = curatorSupplier;
        this.mapper = mapper;
    }

    public  Optional read(Class configType) {
        try {
            byte[] configBytes = curatorSupplier.get().getData().forPath("/");
            LOGGER.debug(
                    "fetched config: {}",
                    () -> new String(configBytes)
            );
            T config = mapper.readValue(
                    configBytes,
                    configType
            );
            return Optional.of(config);
        } catch (Exception e) {
            LOGGER.error("could not read the config", e);
            return Optional.empty();
        }
    }
}