cn.majingjing.config.client.ConfigClient Maven / Gradle / Ivy

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package cn.majingjing.config.client;

import cn.majingjing.config.client.exception.ConfigClientException;
import cn.majingjing.config.client.listener.ConfigChangeListener;
import cn.majingjing.config.client.provider.ConfigProvider;

import java.util.Objects;

/**
 * Config Client
 *
 * @author JingjingMa
 * @date 2019/7/25 10:50
 */
public final class ConfigClient {

    private ConfigClient() {
    }

    private static volatile ConfigProvider provider;

    private static ConfigProvider getProvider() {
        if (Objects.isNull(ConfigClient.provider)) {
            synchronized (ConfigClient.class) {
                if (Objects.isNull(ConfigClient.provider)) {
                    Class aClass = null;
                    try {
                        aClass = Class.forName(System.getProperty("majj.config.client.provider"));
                    } catch (Exception e) {
                        throw new ConfigClientException("ConfigClient config error , not found majj.config.client.provider, "+e.getMessage(),e);
                    }
                    try {
                        ConfigClient.provider = (ConfigProvider) aClass.newInstance();
                    } catch (Exception e) {
                        throw new ConfigClientException("ConfigClient config error , can not create ConfigProvider , "+e.getMessage(),e);
                    }
                }
            }
        }
        return ConfigClient.provider;
    }

    public static ConfigValue getApplicationProp(String key) {
        return getProp("application", key);
    }

    public static ConfigValue getProp(String namespace, String key) {
        String val = ConfigClient.getProvider().getProp(namespace, key);
        return new ConfigValue(namespace, key, val);
    }

    public static ConfigValue getFile(String namespace) {
        String val = ConfigClient.getProvider().getFile(namespace);
        return new ConfigValue(namespace, "", val);
    }

    public static void addListener(String namespace, ConfigChangeListener listener) {
        ConfigClient.getProvider().addListener(namespace, listener);
    }

}