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From GitBox <...@apache.org>
Subject [GitHub] [dubbo-go] hxmhlt commented on a change in pull request #495: Imp: refactor the network transport layer
Date Mon, 01 Jun 2020 11:53:45 GMT

hxmhlt commented on a change in pull request #495:
URL: https://github.com/apache/dubbo-go/pull/495#discussion_r433190966



##########
File path: remoting/exchange_client.go
##########
@@ -0,0 +1,218 @@
+/*
+ * 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 remoting
+
+import (
+	"errors"
+	"sync"
+	"time"
+)
+
+import (
+	"github.com/apache/dubbo-go/common"
+	"github.com/apache/dubbo-go/common/logger"
+	"github.com/apache/dubbo-go/protocol"
+)
+
+var (
+	// store requestID and response
+	pendingResponses *sync.Map = new(sync.Map)
+)
+
+type SequenceType int64
+
+// It is interface of client for network communication.
+// If you use getty as network communication, you should define GettyClient that implements
this interface.
+type Client interface {
+	SetExchangeClient(client *ExchangeClient)
+	// responseHandler is used to deal with msg
+	SetResponseHandler(responseHandler ResponseHandler)
+	// connect url
+	Connect(url common.URL) error
+	// close
+	Close()
+	// send request to server.
+	Request(request *Request, timeout time.Duration, response *PendingResponse) error
+}
+
+// This is abstraction level. it is like facade.
+type ExchangeClient struct {
+	ConnectTimeout time.Duration
+	address        string
+	client         Client
+	init           bool
+}
+
+// handle the message from server
+type ResponseHandler interface {
+	Handler(response *Response)
+}
+
+// create ExchangeClient
+func NewExchangeClient(url common.URL, client Client, connectTimeout time.Duration, lazyInit
bool) *ExchangeClient {
+	exchangeClient := &ExchangeClient{
+		ConnectTimeout: connectTimeout,
+		address:        url.Location,
+		client:         client,
+	}
+	client.SetExchangeClient(exchangeClient)
+	if !lazyInit {
+		if err := exchangeClient.doInit(url); err != nil {
+			return nil
+		}
+	}
+
+	client.SetResponseHandler(exchangeClient)
+	return exchangeClient
+}
+
+func (cl *ExchangeClient) doInit(url common.URL) error {
+	if cl.init {
+		return nil
+	}
+	if cl.client.Connect(url) != nil {
+		//retry for a while
+		time.Sleep(100 * time.Millisecond)
+		if cl.client.Connect(url) != nil {
+			logger.Errorf("Failed to connect server %+v " + url.Location)
+			return errors.New("Failed to connect server " + url.Location)
+		}
+	}
+	//FIXME atomic operation
+	cl.init = true
+	return nil
+}
+
+// two way request
+func (client *ExchangeClient) Request(invocation *protocol.Invocation, url common.URL, timeout
time.Duration,
+	result *protocol.RPCResult) error {
+	if er := client.doInit(url); er != nil {
+		return er
+	}
+	request := NewRequest("2.0.2")
+	request.Data = invocation

Review comment:
       > 2.0.2 means what?
   
   Pls use constant.




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