| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package cluster_impl |
| |
| import ( |
| "context" |
| "fmt" |
| "time" |
| ) |
| |
| import ( |
| "github.com/Workiva/go-datastructures/queue" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/cluster" |
| "github.com/apache/dubbo-go/common/constant" |
| "github.com/apache/dubbo-go/common/logger" |
| "github.com/apache/dubbo-go/protocol" |
| ) |
| |
| type forkingClusterInvoker struct { |
| baseClusterInvoker |
| } |
| |
| func newForkingClusterInvoker(directory cluster.Directory) protocol.Invoker { |
| return &forkingClusterInvoker{ |
| baseClusterInvoker: newBaseClusterInvoker(directory), |
| } |
| } |
| |
| // nolint |
| func (invoker *forkingClusterInvoker) Invoke(ctx context.Context, invocation protocol.Invocation) protocol.Result { |
| if err := invoker.checkWhetherDestroyed(); err != nil { |
| return &protocol.RPCResult{Err: err} |
| } |
| |
| invokers := invoker.directory.List(invocation) |
| if err := invoker.checkInvokers(invokers, invocation); err != nil { |
| return &protocol.RPCResult{Err: err} |
| } |
| |
| var selected []protocol.Invoker |
| forks := int(invoker.GetUrl().GetParamInt(constant.FORKS_KEY, constant.DEFAULT_FORKS)) |
| timeouts := invoker.GetUrl().GetParamInt(constant.TIMEOUT_KEY, constant.DEFAULT_TIMEOUT) |
| if forks < 0 || forks > len(invokers) { |
| selected = invokers |
| } else { |
| loadBalance := getLoadBalance(invokers[0], invocation) |
| for i := 0; i < forks; i++ { |
| if ivk := invoker.doSelect(loadBalance, invocation, invokers, selected); ivk != nil { |
| selected = append(selected, ivk) |
| } |
| } |
| } |
| |
| resultQ := queue.New(1) |
| for _, ivk := range selected { |
| go func(k protocol.Invoker) { |
| result := k.Invoke(ctx, invocation) |
| if err := resultQ.Put(result); err != nil { |
| logger.Errorf("resultQ put failed with exception: %v.\n", err) |
| } |
| }(ivk) |
| } |
| |
| rsps, err := resultQ.Poll(1, time.Millisecond*time.Duration(timeouts)) |
| if err != nil { |
| return &protocol.RPCResult{ |
| Err: fmt.Errorf("failed to forking invoke provider %v, "+ |
| "but no luck to perform the invocation. Last error is: %v", selected, err), |
| } |
| } |
| if len(rsps) == 0 { |
| return &protocol.RPCResult{Err: fmt.Errorf("failed to forking invoke provider %v, but no resp", selected)} |
| } |
| |
| result, ok := rsps[0].(protocol.Result) |
| if !ok { |
| return &protocol.RPCResult{Err: fmt.Errorf("failed to forking invoke provider %v, but not legal resp", selected)} |
| } |
| return result |
| } |