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请看下面的代码，这让我很困惑，在DynamicPropertyFactory类中，它锁定了ConfigurationManager.class，据我了解，锁定仅在类或实例本身起作用。这个怎么理解？
public class *DynamicPropertyFactory*{
public static *DynamicPropertyFactory* initWithConfigurationSource(AbstractConfiguration config) {
synchronized (**ConfigurationManager.class**) {
if (config == null) {
throw new NullPointerException("config is null");
}
if (ConfigurationManager.isConfigurationInstalled() && config != ConfigurationManager.instance) {
throw new IllegalStateException("ConfigurationManager is already initialized with configuration "
+ ConfigurationManager.getConfigInstance());
}
if (config instanceof DynamicPropertySupport) {
return initWithConfigurationSource((DynamicPropertySupport) config);
}
return initWithConfigurationSource(new ConfigurationBackedDynamicPropertySupportImpl(config));
}
}
}