[TD-4939]<test>: add a Proxool Connection Pool Demo (#6657)

* [TD-4939]<test>: add a Proxool Connection Pool Demo

* change

tests/examples/JDBC/connectionPools/pom.xml

@@ -9,12 +9,12 @@
     <version>1.0-SNAPSHOT</version>
 
     <dependencies>
+        <!-- taos -->
         <dependency>
             <groupId>com.taosdata.jdbc</groupId>
             <artifactId>taos-jdbcdriver</artifactId>
             <version>2.0.18</version>
         </dependency>
-
         <!-- druid -->
         <dependency>
             <groupId>com.alibaba</groupId>
@@ -50,6 +50,12 @@
             <artifactId>log4j</artifactId>
             <version>1.2.17</version>
         </dependency>
+        <!-- proxool -->
+        <dependency>
+            <groupId>com.cloudhopper.proxool</groupId>
+            <artifactId>proxool</artifactId>
+            <version>0.9.1</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -57,25 +63,46 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-assembly-plugin</artifactId>
-                <version>3.1.0</version>
-                <configuration>
-                    <archive>
-                        <manifest>
-                            <mainClass>com.taosdata.example.ConnectionPoolDemo</mainClass>
-                        </manifest>
-                    </archive>
-                    <descriptorRefs>
-                        <descriptorRef>jar-with-dependencies</descriptorRef>
-                    </descriptorRefs>
-                </configuration>
+                <version>3.3.0</version>
                 <executions>
                     <execution>
-                        <id>make-assembly</id>
+                        <id>ConnectionPoolDemo</id>
+                        <configuration>
+                            <finalName>ConnectionPoolDemo</finalName>
+                            <archive>
+                                <manifest>
+                                    <mainClass>com.taosdata.example.ConnectionPoolDemo</mainClass>
+                                </manifest>
+                            </archive>
+                            <descriptorRefs>
+                                <descriptorRef>jar-with-dependencies</descriptorRef>
+                            </descriptorRefs>
+                        </configuration>
                         <phase>package</phase>
                         <goals>
                             <goal>single</goal>
                         </goals>
                     </execution>
+
+                    <execution>
+                        <id>ProxoolDemo</id>
+                        <configuration>
+                            <finalName>ProxoolDemo</finalName>
+                            <archive>
+                                <manifest>
+                                    <mainClass>com.taosdata.example.ProxoolDemo</mainClass>
+                                </manifest>
+                            </archive>
+                            <descriptorRefs>
+                                <descriptorRef>jar-with-dependencies</descriptorRef>
+                            </descriptorRefs>
+                        </configuration>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+
                 </executions>
             </plugin>
         </plugins>

tests/examples/JDBC/connectionPools/src/main/java/com/taosdata/example/ProxoolDemo.java

+package com.taosdata.example;
+
+import org.logicalcobwebs.proxool.ProxoolException;
+import org.logicalcobwebs.proxool.configuration.JAXPConfigurator;
+
+import java.sql.*;
+
+public class ProxoolDemo {
+
+
+    public static void main(String[] args) {
+
+        String xml = parseConfigurationXml(args);
+        if (xml == null) {
+            printHelp();
+            System.exit(0);
+        }
+
+        try {
+            JAXPConfigurator.configure(xml, false);
+            Class.forName("org.logicalcobwebs.proxool.ProxoolDriver");
+            Connection connection = DriverManager.getConnection("proxool.ds");
+
+            Statement stmt = connection.createStatement();
+
+            ResultSet rs = stmt.executeQuery("show databases");
+            ResultSetMetaData metaData = rs.getMetaData();
+            while (rs.next()) {
+                for (int i = 1; i <= metaData.getColumnCount(); i++) {
+                    System.out.print(metaData.getColumnLabel(i) + ": " + rs.getString(i));
+                }
+                System.out.println();
+            }
+
+            stmt.close();
+
+        } catch (ClassNotFoundException | SQLException | ProxoolException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static String parseConfigurationXml(String[] args) {
+        String host = null;
+        for (int i = 0; i < args.length; i++) {
+            if ("--xml".equalsIgnoreCase(args[i]) && i < args.length - 1) {
+                host = args[++i];
+            }
+        }
+        return host;
+    }
+
+    private static void printHelp() {
+        System.out.println("Usage: java -jar ProxoolDemo.jar --xml [xml]");
+    }
+
+}

tests/examples/JDBC/connectionPools/src/main/resources/proxool.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<something-else-entirely>
+    <proxool>
+        <alias>ds</alias>
+        <!--数据源的别名-->
+        <driver-url>jdbc:TAOS-RS://127.0.0.1:6041/log</driver-url>
+        <!--url连接串-->
+        <driver-class>com.taosdata.jdbc.rs.RestfulDriver</driver-class>
+        <!--驱动类-->
+        <driver-properties>
+            <property name="user" value="root"/>
+            <property name="password" value="taosdata"/>
+        </driver-properties>
+        <!--最大连接数(默认5个),超过了这个连接数,再有请求时,就排在队列中等候,最大的等待请求数由maximum-new-connections决定 -->
+        <maximum-connection-count>100</maximum-connection-count>
+        <!-- 定义连接池中的最大连接数 -->
+        <maximum-active-time>100</maximum-active-time>
+        <!--最少保持的空闲连接数(默认2个)-->
+        <prototype-count>1</prototype-count>
+        <!--最小连接数(默认2个)-->
+        <minimum-connection-count>5</minimum-connection-count>
+        <!--proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回收,超时的销毁 默认30秒-->
+        <house-keeping-sleep-time>30000</house-keeping-sleep-time>
+        <!--用于保持连接的测试语句 -->
+        <house-keeping-test-sql>select server_status()</house-keeping-test-sql>
+    </proxool>
+</something-else-entirely>
\ No newline at end of file