public static ShenyuPluginLoader getInstance() {
        if (Objects.isNull(pluginLoader)) {
            synchronized (ShenyuPluginLoader.class) {
                if (Objects.isNull(pluginLoader)) {
                    pluginLoader = new ShenyuPluginLoader();
                }
            }
        }
        return pluginLoader;
    }
Get plugin loader instance.

@return plugin loader instance
shenyu-web/src/main/java/org/apache/shenyu/web/loader/ShenyuPluginLoader.java