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| public abstract class AbstractDirectory<T> implements Directory<T> {
// 日志输出
private static final Logger logger = LoggerFactory.getLogger(AbstractDirectory.class);
//服务url
private final URL url ;
private volatile boolean destroyed = false;
//消费者url
private volatile URL consumerUrl ;
//路由
private volatile List<Router> routers;
public AbstractDirectory(URL url) {
this(url, null);
}
public AbstractDirectory(URL url, List<Router> routers) {
this(url, url, routers);
}
public AbstractDirectory(URL url, URL consumerUrl, List<Router> routers) {
if (url == null)
throw new IllegalArgumentException("url == null");
this.url = url;
this.consumerUrl = consumerUrl;
setRouters(routers);
}
//对list方法的默认实现
public List<Invoker<T>> list(Invocation invocation) throws RpcException {
if (destroyed){
throw new RpcException("Directory already destroyed .url: "+ getUrl());
}
//获取Invoker列表的具体实现由具体子类实现
List<Invoker<T>> invokers = doList(invocation);
//路由
List<Router> localRouters = this.routers; // local reference
if (localRouters != null && localRouters.size() > 0) {
for (Router router: localRouters){
try {
if (router.getUrl() == null || router.getUrl().getParameter(Constants.RUNTIME_KEY, true)) {
//路由
invokers = router.route(invokers, getConsumerUrl(), invocation);
}
} catch (Throwable t) {
logger.error("Failed to execute router: " + getUrl() + ", cause: " + t.getMessage(), t);
}
}
}
return invokers;
}
public URL getUrl() {
return url;
}
public List<Router> getRouters(){
return routers;
}
public URL getConsumerUrl() {
return consumerUrl;
}
public void setConsumerUrl(URL consumerUrl) {
this.consumerUrl = consumerUrl;
}
//构造中调用的设置路由的方法
protected void setRouters(List<Router> routers){
// copy list
routers = routers == null ? new ArrayList<Router>() : new ArrayList<Router>(routers);
// append url router
String routerkey = url.getParameter(Constants.ROUTER_KEY);
//指定了router，就使用制定的router来获取扩展实现
if (routerkey != null && routerkey.length() > 0) {
RouterFactory routerFactory = ExtensionLoader.getExtensionLoader(RouterFactory.class).getExtension(routerkey);
routers.add(routerFactory.getRouter(url));
}
// append mock invoker selector
routers.add(new MockInvokersSelector());
Collections.sort(routers);
this.routers = routers;
}
public boolean isDestroyed() {
return destroyed;
}
public void destroy(){
destroyed = true;
}
//子类实现具体的获取invoker列表
protected abstract List<Invoker<T>> doList(Invocation invocation) throws RpcException ;
}
|