[GitHub] [iotdb-client-go] citrusreticulata commented on a diff in pull request #75: [To rel/0.13] Add SessionPool and example

["citrusreticulata (via GitHub)" <gi...@apache.org>]

citrusreticulata commented on code in PR #75:
URL: https://github.com/apache/iotdb-client-go/pull/75#discussion_r1109436680


##########
client/sessionpool.go:
##########
@@ -0,0 +1,130 @@
+/*
+ * 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 client
+
+import (
+	"errors"
+	"log"
+	"runtime"
+	"time"
+)
+
+var errTimeout = errors.New("get session timeout")
+var errPoolClosed = errors.New("sessionPool has closed")
+var defaultMultiple = 5
+
+type SessionPool struct {
+	config                      *PoolConfig
+	maxSize                     int
+	waitToGetSessionTimeoutInMs int
+	enableCompression           bool
+	connectionTimeoutInMs       int
+	ch                          chan Session
+	sem                         chan int8
+}
+
+type PoolConfig struct {
+	Host            string
+	Port            string
+	NodeUrls        []string
+	UserName        string
+	Password        string
+	FetchSize       int32
+	TimeZone        string
+	ConnectRetryMax int
+}
+
+func NewSessionPool(conf *PoolConfig, maxSize, connectionTimeoutInMs, waitToGetSessionTimeoutInMs int,
+	enableCompression bool) SessionPool {
+	if maxSize <= 0 {
+		maxSize = runtime.NumCPU() * defaultMultiple
+	}
+	var ch = make(chan Session, maxSize)
+	var sem = make(chan int8, maxSize)
+	return SessionPool{
+		config:                      conf,
+		maxSize:                     maxSize,
+		waitToGetSessionTimeoutInMs: waitToGetSessionTimeoutInMs,
+		connectionTimeoutInMs:       connectionTimeoutInMs,
+		enableCompression:           enableCompression,
+		ch:                          ch,
+		sem:                         sem,
+	}
+}
+
+func (spool *SessionPool) GetSession() (session Session, err error) {
+	for {
+		select {
+		case spool.sem <- 1:
+			select {
+			case session, ok := <-spool.ch:
+				if ok {
+					return session, nil
+				} else {
+					log.Println("sessonpool has closed")

Review Comment:
   ```suggestion
   					log.Println("sessionpool has closed")
   ```



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