ScriptRouter.java 文件源码

@SuppressWarnings("unchecked")
public <T> List<Invoker<T>> route(List<Invoker<T>> invokers, URL url, Invocation invocation) throws RpcException {
    try {
        List<Invoker<T>> invokersCopy = new ArrayList<Invoker<T>>(invokers);
        Compilable compilable = (Compilable) engine;
        Bindings bindings = engine.createBindings();
        bindings.put("invokers", invokersCopy);
        bindings.put("invocation", invocation);
        bindings.put("context", RpcContext.getContext());
        CompiledScript function = compilable.compile(rule);
        Object obj = function.eval(bindings);
        if (obj instanceof Invoker[]) {
            invokersCopy = Arrays.asList((Invoker<T>[]) obj);
        } else if (obj instanceof Object[]) {
            invokersCopy = new ArrayList<Invoker<T>>();
            for (Object inv : (Object[]) obj) {
                invokersCopy.add((Invoker<T>)inv);
            }
        } else {
            invokersCopy = (List<Invoker<T>>) obj;
        }
        return invokersCopy;
    } catch (ScriptException e) {
        //fail then ignore rule .invokers.
        logger.error("route error , rule has been ignored. rule: " + rule + ", method:" + invocation.getMethodName() + ", url: " + RpcContext.getContext().getUrl(), e);
        return invokers;
    }
}