文章目录

• 前言
• BroadcastCluster作用
• BroadcastCluster
• • • BroadcastClusterInvoker

前言

cluster可选策略

BroadcastCluster作用

• 构建BroadcastClusterInvoker
• 广播调用,即使其中一个Invoker执行异常也不会终止广播

BroadcastCluster

• 负责创建广播调用Invoker

public class BroadcastCluster extends AbstractCluster {
    @Override
    public <T> AbstractClusterInvoker<T> doJoin(Directory<T> directory) throws RpcException {
        return new BroadcastClusterInvoker<>(directory);
    }

}

BroadcastClusterInvoker

• 遍历所有Invoker,进行广播调用

public class BroadcastClusterInvoker<T> extends AbstractClusterInvoker<T> {
    @Override
    @SuppressWarnings({"unchecked", "rawtypes"})
    public Result doInvoke(final Invocation invocation, List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException {
        RpcException exception = null;
        Result result = null;
        广播调用,吞噬异常
        for (Invoker<T> invoker : invokers) {
            try {
                result = invoker.invoke(invocation);
            } catch (RpcException e) {
                exception = e;
                logger.warn(e.getMessage(), e);
            } catch (Throwable e) {
                exception = new RpcException(e.getMessage(), e);
                logger.warn(e.getMessage(), e);
            }
        }
        广播完毕后,有exception,则抛出异常
        if (exception != null) {
            throw exception;
        }
        return result;
    }

}