06、消费端
@DubboReference
private DemoService demoService;
@Override
public String sayHello(String name) {
return demoService.sayHello(name);
}
上面获取@DubboReference 实际获取的是 InvokerInvocationHandler 代理对象
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getDeclaringClass() == Object.class) {
return method.invoke(invoker, args);
}
String methodName = method.getName();
Class<?>[] parameterTypes = method.getParameterTypes();
if (parameterTypes.length == 0) {
if ("toString".equals(methodName)) {
return invoker.toString();
} else if ("$destroy".equals(methodName)) {
invoker.destroy();
return null;
} else if ("hashCode".equals(methodName)) {
return invoker.hashCode();
}
} else if (parameterTypes.length == 1 && "equals".equals(methodName)) {
return invoker.equals(args[0]);
}
RpcInvocation rpcInvocation = new RpcInvocation(method, invoker.getInterface().getName(), args);
//org.apache.dubbo.demo.DemoService
String serviceKey = invoker.getUrl().getServiceKey();
rpcInvocation.setTargetServiceUniqueName(serviceKey);
if (consumerModel != null) {
rpcInvocation.put(Constants.CONSUMER_MODEL, consumerModel);
rpcInvocation.put(Constants.METHOD_MODEL, consumerModel.getMethodModel(method));
}
return invoker.invoke(rpcInvocation).recreate();
}
？？？？？？？
FailoverClusterInvoker
@Override
@SuppressWarnings({"unchecked", "rawtypes"})
public Result doInvoke(Invocation invocation, final List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException {
/**
* providerUrl = {URL@4249} "dubbo://192.168.1.188:20880/org.apache.dubbo.demo.DemoService?anyhost=true&application=dubbo-demo-annotation-provider&category=providers&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.apache.dubbo.demo.DemoService&methods=sayHello,sayHelloAsync&path=org.apache.dubbo.demo.DemoService&pid=18280&protocol=dubbo&release=&side=provider×tamp=1594371345465"
* invoker = {ProtocolFilterWrapper$1@3832} "interface org.apache.dubbo.demo.DemoService -> dubbo://192.168.1.188:20880/org.apache.dubbo.demo.DemoService?anyhost=true&application=dubbo-demo-annotation-consumer&category=providers&check=false&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&init=false&interface=org.apache.dubbo.demo.DemoService&methods=sayHello,sayHelloAsync&path=org.apache.dubbo.demo.DemoService&pid=18998&protocol=dubbo®ister.ip=192.168.1.188&release=&remote.application=dubbo-demo-annotation-provider&side=consumer&sticky=false×tamp=1594371345465"
url = {URL@3900}
*"dubbo://192.168.1.188:20880/org.apache.dubbo.demo.DemoService?anyhost=true&application=dubbo-demo-annotation-consumer&category=providers&check=false&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&init=false&interface=org.apache.dubbo.demo.DemoService&methods=sayHello,sayHelloAsync&path=org.apache.dubbo.demo.DemoService&pid=18998&protocol=dubbo®ister.ip=192.168.1.188&release=&remote.application=dubbo-demo-annotation-provider&side=consumer&sticky=false×tamp=1594371345465"
**/
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;
}
// retry loop.
RpcException le = null; // last exception.
List<Invoker<T>> invoked = new ArrayList<Invoker<T>>(copyInvokers.size()); // invoked invokers.
Set<String> providers = new HashSet<String>(len);
for (int i = 0; i < len; i++) {
//Reselect before retry to avoid a change of candidate `invokers`.
//NOTE: if `invokers` changed, then `invoked` also lose accuracy.
if (i > 0) {
checkWhetherDestroyed();
copyInvokers = list(invocation);
// check again
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()) { // biz exception.
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);
}
InvokerWrapper
@Override
public Result invoke(Invocation invocation) throws RpcException {
return invoker.invoke(invocation);
}
ProtocolFilterWrapper
FailoverClusterInvoker
DubboInvoker
ProtocolFilterWrapper
[10/07/20 18:56:27:006 CST] main ERROR proxy.InvokerInvocationHandler: [DUBBO] invoker.invoke(rpcInvocation) ===>: class org.apache.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
[10/07/20 18:56:27:010 CST] main ERROR wrapper.MockClusterInvoker: [DUBBO] invoker.invoke(invocation) ===>: class org.apache.dubbo.rpc.cluster.support.wrapper.AbstractCluster$InterceptorInvokerNode =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
[10/07/20 18:56:27:028 CST] main ERROR support.FailoverClusterInvoker: [DUBBO] invoker.invoke(invocation) ===>: class org.apache.dubbo.registry.integration.RegistryDirectory$InvokerDelegate =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
[10/07/20 18:56:27:028 CST] main ERROR protocol.InvokerWrapper: [DUBBO] invoker.invoke(invocation) ===>: class org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1 =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
[10/07/20 18:56:27:028 CST] main ERROR protocol.ProtocolFilterWrapper: [DUBBO] invoker.invoke(invocation) ===>: class org.apache.dubbo.rpc.listener.ListenerInvokerWrapper =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
[10/07/20 18:56:30:163 CST] main ERROR filter.ConsumerContextFilter: [DUBBO] invoker.invoke(invocation) ===>: class org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1 =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
[10/07/20 18:56:30:163 CST] main ERROR protocol.ProtocolFilterWrapper: [DUBBO] invoker.invoke(invocation) ===>: class org.apache.dubbo.rpc.listener.ListenerInvokerWrapper =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
[10/07/20 18:56:30:163 CST] main ERROR filter.FutureFilter: [DUBBO] invoker.invoke(invocation) ===>: class org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1 =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
[10/07/20 18:56:30:164 CST] main ERROR protocol.ProtocolFilterWrapper: [DUBBO] invoker.invoke(invocation) ===>: class org.apache.dubbo.rpc.listener.ListenerInvokerWrapper =====>: RpcInvocation [methodName=sayHello, parameterTypes=[class java.lang.String], arguments=[world], attachments={}], dubbo version: , current host: 192.168.1.188
result :Hello world, response from provider: 192.168.1.188:20880``