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| public Result invoke(final Invocation invocation) throws RpcException { checkWhetherDestroyed();
Map<String, String> contextAttachments = RpcContext.getContext().getAttachments(); if (contextAttachments != null && contextAttachments.size() != 0) { ((RpcInvocation) invocation).addAttachments(contextAttachments); } List<Invoker<T>> invokers = list(invocation); LoadBalance loadbalance = initLoadBalance(invokers, invocation); RpcUtils.attachInvocationIdIfAsync(getUrl(), invocation); return doInvoke(invocation, invokers, loadbalance); }
public Result doInvoke(Invocation invocation, final List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException { List<Invoker<T>> copyInvokers = invokers; checkInvokers(copyInvokers, invocation); String methodName = RpcUtils.getMethodName(invocation); int len = getUrl().getMethodParameter(methodName, RETRIES_KEY, DEFAULT_RETRIES) + 1; if (len <= 0) { len = 1; } RpcException le = null; List<Invoker<T>> invoked = new ArrayList<Invoker<T>>(copyInvokers.size()); Set<String> providers = new HashSet<String>(len); for (int i = 0; i < len; i++) { if (i > 0) { checkWhetherDestroyed(); copyInvokers = list(invocation); checkInvokers(copyInvokers, invocation); } Invoker<T> invoker = select(loadbalance, invocation, copyInvokers, invoked); invoked.add(invoker); RpcContext.getContext().setInvokers((List) invoked); try { Result result = invoker.invoke(invocation); if (le != null && logger.isWarnEnabled()) { logger.warn("Although retry the method " + methodName + " in the service " + getInterface().getName() + " was successful by the provider " + invoker.getUrl().getAddress() + ", but there have been failed providers " + providers + " (" + providers.size() + "/" + copyInvokers.size() + ") from the registry " + directory.getUrl().getAddress() + " on the consumer " + NetUtils.getLocalHost() + " using the dubbo version " + Version.getVersion() + ". Last error is: " + le.getMessage(), le); } return result; } catch (RpcException e) { if (e.isBiz()) { throw e; } le = e; } catch (Throwable e) { le = new RpcException(e.getMessage(), e); } finally { providers.add(invoker.getUrl().getAddress()); } } throw new RpcException(le.getCode(), "Failed to invoke the method " + methodName + " in the service " + getInterface().getName() + ". Tried " + len + " times of the providers " + providers + " (" + providers.size() + "/" + copyInvokers.size() + ") from the registry " + directory.getUrl().getAddress() + " on the consumer " + NetUtils.getLocalHost() + " using the dubbo version " + Version.getVersion() + ". Last error is: " + le.getMessage(), le.getCause() != null ? le.getCause() : le); }
protected Invoker<T> select(LoadBalance loadbalance, Invocation invocation, List<Invoker<T>> invokers, List<Invoker<T>> selected) throws RpcException {
if (CollectionUtils.isEmpty(invokers)) { return null; } String methodName = invocation == null ? StringUtils.EMPTY : invocation.getMethodName();
boolean sticky = invokers.get(0).getUrl() .getMethodParameter(methodName, CLUSTER_STICKY_KEY, DEFAULT_CLUSTER_STICKY);
if (stickyInvoker != null && !invokers.contains(stickyInvoker)) { stickyInvoker = null; } if (sticky && stickyInvoker != null && (selected == null || !selected.contains(stickyInvoker))) { if (availablecheck && stickyInvoker.isAvailable()) { return stickyInvoker; } }
Invoker<T> invoker = doSelect(loadbalance, invocation, invokers, selected);
if (sticky) { stickyInvoker = invoker; } return invoker; }
private Invoker<T> doSelect(LoadBalance loadbalance, Invocation invocation, List<Invoker<T>> invokers, List<Invoker<T>> selected) throws RpcException {
if (CollectionUtils.isEmpty(invokers)) { return null; } if (invokers.size() == 1) { return invokers.get(0); } Invoker<T> invoker = loadbalance.select(invokers, getUrl(), invocation);
if ((selected != null && selected.contains(invoker)) || (!invoker.isAvailable() && getUrl() != null && availablecheck)) { try { Invoker<T> rInvoker = reselect(loadbalance, invocation, invokers, selected, availablecheck); if (rInvoker != null) { invoker = rInvoker; } else { int index = invokers.indexOf(invoker); try { invoker = invokers.get((index + 1) % invokers.size()); } catch (Exception e) { logger.warn(e.getMessage() + " may because invokers list dynamic change, ignore.", e); } } } catch (Throwable t) { logger.error("cluster reselect fail reason is :" + t.getMessage() + " if can not solve, you can set cluster.availablecheck=false in url", t); } } return invoker; }
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