add forkingClusterInvoker

cluster/cluster_impl/forking_cluster.go

@@ -0,0 +1,40 @@
+/*
+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 (
+	"github.com/apache/dubbo-go/cluster"
+	"github.com/apache/dubbo-go/common/extension"
+	"github.com/apache/dubbo-go/protocol"
+)
+
+type forkingCluster struct{}
+
+const forking = "forking"
+
+func init() {
+	extension.SetCluster(forking, NewForkingCluster)
+}
+
+func NewForkingCluster() cluster.Cluster {
+	return &forkingCluster{}
+}
+
+func (cluster *forkingCluster) Join(directory cluster.Directory) protocol.Invoker {
+	return newForkingClusterInvoker(directory)
+}

cluster/cluster_impl/forking_cluster_invoker.go

@@ -0,0 +1,99 @@
+/*
+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 (
+	"errors"
+	"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),
+	}
+}
+
+func (invoker *forkingClusterInvoker) Invoke(invocation protocol.Invocation) protocol.Result {
+	err := invoker.checkWhetherDestroyed()
+	if err != nil {
+		return &protocol.RPCResult{Err: err}
+	}
+
+	invokers := invoker.directory.List(invocation)
+	err = invoker.checkInvokers(invokers, invocation)
+	if 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 {
+		selected = make([]protocol.Invoker, 0)
+		loadbalance := getLoadBalance(invokers[0], invocation)
+		for i := 0; i < forks; i++ {
+			ivk := invoker.doSelect(loadbalance, invocation, invokers, selected)
+			if ivk != nil {
+				selected = append(selected, ivk)
+			}
+		}
+	}
+
+	resultQ := queue.New(1)
+	for _, ivk := range selected {
+		go func(k protocol.Invoker) {
+			result := k.Invoke(invocation)
+			err := resultQ.Put(result)
+			if 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: errors.New(fmt.Sprintf("failed to forking invoke provider %v, but no luck to perform the invocation. Last error is: %s", selected, err.Error()))}
+	}
+	if len(rsps) == 0 {
+		return &protocol.RPCResult{Err: errors.New(fmt.Sprintf("failed to forking invoke provider %v, but no resp", selected))}
+	}
+	result, ok := rsps[0].(protocol.Result)
+	if !ok {
+		return &protocol.RPCResult{Err: errors.New(fmt.Sprintf("failed to forking invoke provider %v, but not legal resp", selected))}
+	}
+	return result
+}

cluster/cluster_impl/forking_cluster_test.go

@@ -0,0 +1,162 @@
+/*
+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"
+	"strconv"
+	"sync"
+	"testing"
+	"time"
+)
+
+import (
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/assert"
+)
+
+import (
+	"github.com/apache/dubbo-go/cluster/directory"
+	"github.com/apache/dubbo-go/cluster/loadbalance"
+	"github.com/apache/dubbo-go/common"
+	"github.com/apache/dubbo-go/common/constant"
+	"github.com/apache/dubbo-go/common/extension"
+	"github.com/apache/dubbo-go/protocol"
+	"github.com/apache/dubbo-go/protocol/invocation"
+	"github.com/apache/dubbo-go/protocol/mock"
+)
+
+var (
+	forkingUrl, _ = common.NewURL(context.TODO(), "dubbo://192.168.1.1:20000/com.ikurento.user.UserProvider")
+)
+
+func registerForking(t *testing.T, mockInvokers ...*mock.MockInvoker) protocol.Invoker {
+	extension.SetLoadbalance(loadbalance.RoundRobin, loadbalance.NewRoundRobinLoadBalance)
+
+	invokers := []protocol.Invoker{}
+	for i, ivk := range mockInvokers {
+		invokers = append(invokers, ivk)
+		if i == 0 {
+			ivk.EXPECT().GetUrl().Return(forkingUrl)
+		}
+	}
+	staticDir := directory.NewStaticDirectory(invokers)
+
+	forkingCluster := NewForkingCluster()
+	clusterInvoker := forkingCluster.Join(staticDir)
+	return clusterInvoker
+}
+
+func Test_ForkingInvokeSuccess(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	invokers := make([]*mock.MockInvoker, 0)
+
+	mockResult := &protocol.RPCResult{Rest: rest{tried: 0, success: true}}
+	forkingUrl.AddParam(constant.FORKS_KEY, strconv.Itoa(3))
+	//forkingUrl.AddParam(constant.TIMEOUT_KEY, strconv.Itoa(constant.DEFAULT_TIMEOUT))
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	for i := 0; i < 2; i++ {
+		invoker := mock.NewMockInvoker(ctrl)
+		invokers = append(invokers, invoker)
+		invoker.EXPECT().IsAvailable().Return(true).AnyTimes()
+		invoker.EXPECT().Invoke(gomock.Any()).DoAndReturn(
+			func(invocation protocol.Invocation) protocol.Result {
+				wg.Done()
+				return mockResult
+			})
+	}
+
+	clusterInvoker := registerForking(t, invokers...)
+
+	result := clusterInvoker.Invoke(&invocation.RPCInvocation{})
+	assert.Equal(t, mockResult, result)
+	wg.Wait()
+}
+
+func Test_ForkingInvokeTimeout(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	invokers := make([]*mock.MockInvoker, 0)
+
+	mockResult := &protocol.RPCResult{Rest: rest{tried: 0, success: true}}
+	forkingUrl.AddParam(constant.FORKS_KEY, strconv.Itoa(3))
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	for i := 0; i < 2; i++ {
+		invoker := mock.NewMockInvoker(ctrl)
+		invokers = append(invokers, invoker)
+		invoker.EXPECT().IsAvailable().Return(true).AnyTimes()
+		invoker.EXPECT().Invoke(gomock.Any()).DoAndReturn(
+			func(invocation protocol.Invocation) protocol.Result {
+				time.Sleep(2 * time.Second)
+				wg.Done()
+				return mockResult
+			})
+	}
+
+	clusterInvoker := registerForking(t, invokers...)
+
+	result := clusterInvoker.Invoke(&invocation.RPCInvocation{})
+	assert.NotNil(t, result)
+	assert.NotNil(t, result.Error())
+	wg.Wait()
+}
+
+func Test_ForkingInvokeHalfTimeout(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	invokers := make([]*mock.MockInvoker, 0)
+
+	mockResult := &protocol.RPCResult{Rest: rest{tried: 0, success: true}}
+	forkingUrl.AddParam(constant.FORKS_KEY, strconv.Itoa(3))
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	for i := 0; i < 2; i++ {
+		invoker := mock.NewMockInvoker(ctrl)
+		invokers = append(invokers, invoker)
+		invoker.EXPECT().IsAvailable().Return(true).AnyTimes()
+		if i == 1 {
+			invoker.EXPECT().Invoke(gomock.Any()).DoAndReturn(
+				func(invocation protocol.Invocation) protocol.Result {
+					wg.Done()
+					return mockResult
+				})
+		} else {
+			invoker.EXPECT().Invoke(gomock.Any()).DoAndReturn(
+				func(invocation protocol.Invocation) protocol.Result {
+					time.Sleep(2 * time.Second)
+					wg.Done()
+					return mockResult
+				})
+		}
+	}
+
+	clusterInvoker := registerForking(t, invokers...)
+
+	result := clusterInvoker.Invoke(&invocation.RPCInvocation{})
+	assert.Equal(t, mockResult, result)
+	wg.Wait()
+}

common/constant/key.go

@@ -48,6 +48,9 @@ const (
 	RETRIES_KEY          = "retries"
 	BEAN_NAME            = "bean.name"
 	FAIL_BACK_TASKS_KEY  = "failbacktasks"
+	FORKS_KEY            = "forks"
+	DEFAULT_FORKS        = 2
+	DEFAULT_TIMEOUT      = 1000
 )
 
 const (

config/reference_config_test.go

@@ -20,6 +20,8 @@ package config
 import (
 	"sync"
 	"testing"
+
+	"github.com/apache/dubbo-go/common/constant"
 )
 
 import (
@@ -82,6 +84,7 @@ func doInit() {
 			"MockService": {
 				Params: map[string]string{
 					"serviceid": "soa.mock",
+					"forks":     "5",
 				},
 				Registry:      "shanghai_reg1,shanghai_reg2,hangzhou_reg1,hangzhou_reg2",
 				InterfaceName: "com.MockService",
@@ -190,6 +193,23 @@ func Test_Implement(t *testing.T) {
 	consumerConfig = nil
 }
 
+func Test_Forking(t *testing.T) {
+	doInit()
+	extension.SetProtocol("dubbo", GetProtocol)
+	extension.SetProtocol("registry", GetProtocol)
+	m := consumerConfig.References["MockService"]
+	m.Url = "dubbo://127.0.0.1:20000;registry://127.0.0.2:20000"
+
+	for _, reference := range consumerConfig.References {
+		reference.Refer()
+		forks := int(reference.invoker.GetUrl().GetParamInt(constant.FORKS_KEY, constant.DEFAULT_FORKS))
+		assert.Equal(t, 5, forks)
+		assert.NotNil(t, reference.pxy)
+		assert.NotNil(t, reference.Cluster)
+	}
+	consumerConfig = nil
+}
+
 func GetProtocol() protocol.Protocol {
 	if regProtocol != nil {
 		return regProtocol

config/testdata/consumer_config.yml

@@ -47,6 +47,7 @@ references:
     params:
       "serviceid":
         "soa.com.ikurento.user.UserProvider"
+      "forks": 5
 
 protocol_conf:
   dubbo: