apollo-client/src/main/java/com/ctrip/framework/apollo/spring/config/ConfigPropertySourceFactory.java/ConfigPropertySourceFactory/getConfigPropertySource
class ConfigPropertySourceFactory:  public ConfigPropertySource getConfigPropertySource(String name, Config source) {
    ConfigPropertySource configPropertySource = new ConfigPropertySource(name, source);

    configPropertySources.add(configPropertySource);

    return configPropertySource;
  }