Thrift入門及Java實例演示<轉載備用>

 

 

Thrift入門及Java實例演示
做者: Michael 日期: 2012 年 6 月 14 日

•概述
•下載配置

•基本概念
1.數據類型
2.服務端編碼基本步驟

3.客戶端編碼基本步驟

4.數據傳輸協議

•實例演示（java） 
1. thrift生成代碼
2. 實現接口Iface
3.TSimpleServer服務模型
4.TThreadPoolServer 服務模型
5.TNonblockingServer 服務模型
6.THsHaServer服務模型
7.異步客戶端
[一]、概述

Thrift是一個軟件框架，用來進行可擴展且跨語言的服務的開發。它結合了功能強大的軟件堆棧和代碼生成引擎，以構建在 C++, Java, Python, PHP, Ruby, Erlang, Perl, Haskell, C#, Cocoa, JavaScript, Node.js, Smalltalk, and OCaml 等等編程語言間無縫結合的、高效的服務。

Thrift最初由facebook開發，07年四月開放源碼，08年5月進入apache孵化器。thrift容許你定義一個簡單的定義文件中的數據類型和服務接口。以做爲輸入文件，編譯器生成代碼用來方便地生成RPC客戶端和服務器通訊的無縫跨編程語言。

官網地址：thrift.apache.org

推薦值得一看的文章：

•http://jnb.ociweb.com/jnb/jnbJun2009.html

•http://wiki.apache.org/thrift
•http://thrift.apache.org/static/files/thrift-20070401.pdf
[二]、下載配置

到官網下載最新版本，截止今日（2012-06-11）最新版本爲0.8.0.

1. 若是是Maven構建項目的，直接在pom.xml 中添加以下內容：

查看源代碼打印幫助
1 <dependency> 

2   <groupId>org.apache.thrift</groupId> 

3   <artifactId>libthrift</artifactId> 

4   <version>0.8.0</version> 

5 </dependency> 
2.若是本身編譯lib包，把下載的壓縮包解壓到X:盤，而後在X:\thrift-0.8.0\lib\java 目錄下運行ant進行自動編譯，會在X:\thrift-0.8.0\lib\java\build\ 目錄下看到編譯好的lib包：libthrift-0.8.0.jar

[三]、基本概念

1.數據類型

•基本類型：
◦bool：布爾值，true 或 false，對應 Java 的 boolean
◦byte：8 位有符號整數，對應 Java 的 byte
◦i16：16 位有符號整數，對應 Java 的 short
◦i32：32 位有符號整數，對應 Java 的 int
◦i64：64 位有符號整數，對應 Java 的 long
◦double：64 位浮點數，對應 Java 的 double
◦string：utf-8編碼的字符串，對應 Java 的 String
•結構體類型：
◦struct：定義公共的對象，相似於 C 語言中的結構體定義，在 Java 中是一個 JavaBean
•容器類型：
◦list：對應 Java 的 ArrayList
◦set：對應 Java 的 HashSet
◦map：對應 Java 的 HashMap
•異常類型：
◦exception：對應 Java 的 Exception
•服務類型：
◦service：對應服務的類
2.服務端編碼基本步驟：

•實現服務處理接口impl
•建立TProcessor
•建立TServerTransport
•建立TProtocol
•建立TServer
•啓動Server
3.客戶端編碼基本步驟：

•建立Transport
•建立TProtocol
•基於TTransport和TProtocol建立 Client
•調用Client的相應方法
4.數據傳輸協議

•TBinaryProtocol : 二進制格式.
•TCompactProtocol : 壓縮格式
•TJSONProtocol : JSON格式
•TSimpleJSONProtocol : 提供JSON只寫協議, 生成的文件很容易經過腳本語言解析
tips:客戶端和服務端的協議要一致

[四]、實例演示

1. thrift生成代碼

建立Thrift文件：G:\test\thrift\demoHello.thrift ,內容以下：

查看源代碼打印幫助
1 namespace java com.micmiu.thrift.demo 

2   

3 service  HelloWorldService { 

4   string sayHello(1:string username) 

5 } 
目錄結構以下：

G:\test\thrift>tree /F
卷 other 的文件夾 PATH 列表
卷序列號爲 D238-BE47
G:.
    demoHello.thrift
    demouser.thrift
    thrift-0.8.0.exe

沒有子文件夾thrift-0.8.0.exe 是官網提供的windows下編譯工具，運用這個工具生成相關代碼：

查看源代碼打印幫助
1 thrift-0.8.0.exe -r -gen java ./demoHello.thrift 
生成後的目錄結構以下：

G:\test\thrift>tree /F
卷 other 的文件夾 PATH 列表
卷序列號爲 D238-BE47
G:.
│  demoHello.thrift
│  demouser.thrift
│  thrift-0.8.0.exe
│
└─gen-java
    └─com
        └─micmiu
            └─thrift
                └─demo
                        HelloWorldService.java將生成的HelloWorldService.java 文件copy到本身測試的工程中，個人工程是用maven構建的，故在pom.xml中增長以下內容：

查看源代碼打印幫助
1 <dependency> 

2     <groupId>org.apache.thrift</groupId> 

3     <artifactId>libthrift</artifactId> 

4     <version>0.8.0</version> 

5 </dependency> 

6 <dependency> 

7     <groupId>org.slf4j</groupId> 

8     <artifactId>slf4j-log4j12</artifactId> 

9     <version>1.5.8</version> 

10 </dependency> 
2. 實現接口Iface

java代碼：HelloWorldImpl.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import org.apache.thrift.TException; 

4   

5 /** 

6  * blog http://www.micmiu.com 

7  * 

8  * @author Michael 

9  * 

10  */ 

11 public class HelloWorldImpl implements HelloWorldService.Iface { 

12   

13     public HelloWorldImpl() { 

14     } 

15   

16     @Override 

17     public String sayHello(String username) throws TException { 

18         return "Hi," + username + " welcome to my blog www.micmiu.com"; 

19     } 

20   

21 } 
3.TSimpleServer服務端

簡單的單線程服務模型，通常用於測試。

編寫服務端server代碼：HelloServerDemo.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import org.apache.thrift.TProcessor; 

4 import org.apache.thrift.protocol.TBinaryProtocol; 

5 import org.apache.thrift.protocol.TCompactProtocol; 

6 import org.apache.thrift.protocol.TJSONProtocol; 

7 import org.apache.thrift.protocol.TSimpleJSONProtocol; 

8 import org.apache.thrift.server.TServer; 

9 import org.apache.thrift.server.TSimpleServer; 

10 import org.apache.thrift.transport.TServerSocket; 

11   

12 /** 

13  * blog http://www.micmiu.com 

14  * 

15  * @author Michael 

16  * 

17  */ 

18 public class HelloServerDemo { 

19     public static final int SERVER_PORT = 8090; 

20   

21     public void startServer() { 

22         try { 

23             System.out.println("HelloWorld TSimpleServer start ...."); 

24   

25             TProcessor tprocessor = new HelloWorldService.Processor<HelloWorldService.Iface>( 

26                     new HelloWorldImpl()); 

27             // HelloWorldService.Processor<HelloWorldService.Iface> tprocessor = 

28             // new HelloWorldService.Processor<HelloWorldService.Iface>( 

29             // new HelloWorldImpl()); 

30   

31             // 簡單的單線程服務模型，通常用於測試 

32             TServerSocket serverTransport = new TServerSocket(SERVER_PORT); 

33             TServer.Args tArgs = new TServer.Args(serverTransport); 

34             tArgs.processor(tprocessor); 

35             tArgs.protocolFactory(new TBinaryProtocol.Factory()); 

36             // tArgs.protocolFactory(new TCompactProtocol.Factory()); 

37             // tArgs.protocolFactory(new TJSONProtocol.Factory()); 

38             TServer server = new TSimpleServer(tArgs); 

39             server.serve(); 

40   

41         } catch (Exception e) { 

42             System.out.println("Server start error!!!"); 

43             e.printStackTrace(); 

44         } 

45     } 

46   

47     /** 

48      * @param args 

49      */ 

50     public static void main(String[] args) { 

51         HelloServerDemo server = new HelloServerDemo(); 

52         server.startServer(); 

53     } 

54   

55 } 
編寫客戶端Client代碼：HelloClientDemo.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import org.apache.thrift.TException; 

4 import org.apache.thrift.protocol.TBinaryProtocol; 

5 import org.apache.thrift.protocol.TCompactProtocol; 

6 import org.apache.thrift.protocol.TJSONProtocol; 

7 import org.apache.thrift.protocol.TProtocol; 

8 import org.apache.thrift.transport.TSocket; 

9 import org.apache.thrift.transport.TTransport; 

10 import org.apache.thrift.transport.TTransportException; 

11   

12 /** 

13  * blog http://www.micmiu.com 

14  * 

15  * @author Michael 

16  * 

17  */ 

18 public class HelloClientDemo { 

19   

20     public static final String SERVER_IP = "localhost"; 

21     public static final int SERVER_PORT = 8090; 

22     public static final int TIMEOUT = 30000; 

23   

24     /** 

25      * 

26      * @param userName 

27      */ 

28     public void startClient(String userName) { 

29         TTransport transport = null; 

30         try { 

31             transport = new TSocket(SERVER_IP, SERVER_PORT, TIMEOUT); 

32             // 協議要和服務端一致 

33             TProtocol protocol = new TBinaryProtocol(transport); 

34             // TProtocol protocol = new TCompactProtocol(transport); 

35             // TProtocol protocol = new TJSONProtocol(transport); 

36             HelloWorldService.Client client = new HelloWorldService.Client( 

37                     protocol); 

38             transport.open(); 

39             String result = client.sayHello(userName); 

40             System.out.println("Thrify client result =: " + result); 

41         } catch (TTransportException e) { 

42             e.printStackTrace(); 

43         } catch (TException e) { 

44             e.printStackTrace(); 

45         } finally { 

46             if (null != transport) { 

47                 transport.close(); 

48             } 

49         } 

50     } 

51   

52     /** 

53      * @param args 

54      */ 

55     public static void main(String[] args) { 

56         HelloClientDemo client = new HelloClientDemo(); 

57         client.startClient("Michael"); 

58   

59     } 

60   

61 } 
先運行服務端程序，日誌以下：

HelloWorld TSimpleServer start ....再運行客戶端調用程序，日誌以下：

Thrify client result =: Hi,Michael welcome to my blog www.micmiu.com測試成功，和預期的返回信息一致。

4.TThreadPoolServer 服務模型

線程池服務模型，使用標準的阻塞式IO，預先建立一組線程處理請求。

編寫服務端代碼：HelloServerDemo.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import org.apache.thrift.TProcessor; 

4 import org.apache.thrift.protocol.TBinaryProtocol; 

5 import org.apache.thrift.server.TServer; 

6 import org.apache.thrift.server.TThreadPoolServer; 

7 import org.apache.thrift.transport.TServerSocket; 

8   

9 /** 

10  * blog http://www.micmiu.com 

11  * 

12  * @author Michael 

13  * 

14  */ 

15 public class HelloServerDemo { 

16     public static final int SERVER_PORT = 8090; 

17   

18     public void startServer() { 

19         try { 

20             System.out.println("HelloWorld TThreadPoolServer start ...."); 

21   

22             TProcessor tprocessor = new HelloWorldService.Processor<HelloWorldService.Iface>( 

23                     new HelloWorldImpl()); 

24   

25              TServerSocket serverTransport = new TServerSocket(SERVER_PORT); 

26              TThreadPoolServer.Args ttpsArgs = new TThreadPoolServer.Args( 

27              serverTransport); 

28              ttpsArgs.processor(tprocessor); 

29              ttpsArgs.protocolFactory(new TBinaryProtocol.Factory()); 

30   

31             // 線程池服務模型，使用標準的阻塞式IO，預先建立一組線程處理請求。 

32              TServer server = new TThreadPoolServer(ttpsArgs); 

33              server.serve(); 

34   

35         } catch (Exception e) { 

36             System.out.println("Server start error!!!"); 

37             e.printStackTrace(); 

38         } 

39     } 

40   

41     /** 

42      * @param args 

43      */ 

44     public static void main(String[] args) { 

45         HelloServerDemo server = new HelloServerDemo(); 

46         server.startServer(); 

47     } 

48   

49 } 
客戶端Client代碼和以前的同樣，只要數據傳輸的協議一致便可，客戶端測試成功，結果以下：

Thrify client result =: Hi,Michael welcome to my blog www.micmiu.com5.TNonblockingServer 服務模型

使用非阻塞式IO，服務端和客戶端須要指定 TFramedTransport 數據傳輸的方式。

編寫服務端代碼：HelloServerDemo.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import org.apache.thrift.TProcessor; 

4 import org.apache.thrift.protocol.TCompactProtocol; 

5 import org.apache.thrift.server.TNonblockingServer; 

6 import org.apache.thrift.server.TServer; 

7 import org.apache.thrift.transport.TFramedTransport; 

8 import org.apache.thrift.transport.TNonblockingServerSocket; 

9   

10 /** 

11  * blog http://www.micmiu.com 

12  * 

13  * @author Michael 

14  * 

15  */ 

16 public class HelloServerDemo { 

17     public static final int SERVER_PORT = 8090; 

18   

19     public void startServer() { 

20         try { 

21             System.out.println("HelloWorld TNonblockingServer start ...."); 

22   

23             TProcessor tprocessor = new HelloWorldService.Processor<HelloWorldService.Iface>( 

24                     new HelloWorldImpl()); 

25   

26             TNonblockingServerSocket tnbSocketTransport = new TNonblockingServerSocket( 

27                     SERVER_PORT); 

28             TNonblockingServer.Args tnbArgs = new TNonblockingServer.Args( 

29                     tnbSocketTransport); 

30             tnbArgs.processor(tprocessor); 

31             tnbArgs.transportFactory(new TFramedTransport.Factory()); 

32             tnbArgs.protocolFactory(new TCompactProtocol.Factory()); 

33   

34             // 使用非阻塞式IO，服務端和客戶端須要指定TFramedTransport數據傳輸的方式 

35             TServer server = new TNonblockingServer(tnbArgs); 

36             server.serve(); 

37   

38         } catch (Exception e) { 

39             System.out.println("Server start error!!!"); 

40             e.printStackTrace(); 

41         } 

42     } 

43   

44     /** 

45      * @param args 

46      */ 

47     public static void main(String[] args) { 

48         HelloServerDemo server = new HelloServerDemo(); 

49         server.startServer(); 

50     } 

51   

52 } 
編寫客戶端代碼：HelloClientDemo.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import org.apache.thrift.TException; 

4 import org.apache.thrift.protocol.TCompactProtocol; 

5 import org.apache.thrift.protocol.TProtocol; 

6 import org.apache.thrift.transport.TFramedTransport; 

7 import org.apache.thrift.transport.TSocket; 

8 import org.apache.thrift.transport.TTransport; 

9 import org.apache.thrift.transport.TTransportException; 

10   

11 /** 

12  * blog http://www.micmiu.com 

13  * 

14  * @author Michael 

15  * 

16  */ 

17 public class HelloClientDemo { 

18   

19     public static final String SERVER_IP = "localhost"; 

20     public static final int SERVER_PORT = 8090; 

21     public static final int TIMEOUT = 30000; 

22   

23     /** 

24      * 

25      * @param userName 

26      */ 

27     public void startClient(String userName) { 

28         TTransport transport = null; 

29         try { 

30             transport = new TFramedTransport(new TSocket(SERVER_IP, 

31                     SERVER_PORT, TIMEOUT)); 

32             // 協議要和服務端一致 

33             TProtocol protocol = new TCompactProtocol(transport); 

34             HelloWorldService.Client client = new HelloWorldService.Client( 

35                     protocol); 

36             transport.open(); 

37             String result = client.sayHello(userName); 

38             System.out.println("Thrify client result =: " + result); 

39         } catch (TTransportException e) { 

40             e.printStackTrace(); 

41         } catch (TException e) { 

42             e.printStackTrace(); 

43         } finally { 

44             if (null != transport) { 

45                 transport.close(); 

46             } 

47         } 

48     } 

49   

50     /** 

51      * @param args 

52      */ 

53     public static void main(String[] args) { 

54         HelloClientDemo client = new HelloClientDemo(); 

55         client.startClient("Michael"); 

56   

57     } 

58   

59 } 
客戶端的測試成功，結果以下：

Thrify client result =: Hi,Michael welcome to my blog www.micmiu.com6.THsHaServer服務模型

半同步半異步的服務端模型，須要指定爲： TFramedTransport 數據傳輸的方式。

編寫服務端代碼：HelloServerDemo.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import org.apache.thrift.TProcessor; 

4 import org.apache.thrift.protocol.TBinaryProtocol; 

5 import org.apache.thrift.protocol.TCompactProtocol; 

6 import org.apache.thrift.server.THsHaServer; 

7 import org.apache.thrift.server.TNonblockingServer; 

8 import org.apache.thrift.server.TServer; 

9 import org.apache.thrift.server.TSimpleServer; 

10 import org.apache.thrift.server.TThreadPoolServer; 

11 import org.apache.thrift.transport.TFramedTransport; 

12 import org.apache.thrift.transport.TNonblockingServerSocket; 

13 import org.apache.thrift.transport.TServerSocket; 

14   

15 /** 

16  * blog http://www.micmiu.com 

17  * 

18  * @author Michael 

19  * 

20  */ 

21 public class HelloServerDemo { 

22     public static final int SERVER_PORT = 8090; 

23   

24     public void startServer() { 

25         try { 

26             System.out.println("HelloWorld THsHaServer start ...."); 

27   

28             TProcessor tprocessor = new HelloWorldService.Processor<HelloWorldService.Iface>( 

29                     new HelloWorldImpl()); 

30   

31             TNonblockingServerSocket tnbSocketTransport = new TNonblockingServerSocket( 

32                     SERVER_PORT); 

33             THsHaServer.Args thhsArgs = new THsHaServer.Args(tnbSocketTransport); 

34             thhsArgs.processor(tprocessor); 

35             thhsArgs.transportFactory(new TFramedTransport.Factory()); 

36             thhsArgs.protocolFactory(new TBinaryProtocol.Factory()); 

37   

38             //半同步半異步的服務模型 

39             TServer server = new THsHaServer(thhsArgs); 

40             server.serve(); 

41   

42         } catch (Exception e) { 

43             System.out.println("Server start error!!!"); 

44             e.printStackTrace(); 

45         } 

46     } 

47   

48     /** 

49      * @param args 

50      */ 

51     public static void main(String[] args) { 

52         HelloServerDemo server = new HelloServerDemo(); 

53         server.startServer(); 

54     } 

55   

56 } 
客戶端代碼和上面 4 中的相似，只要注意傳輸協議一致以及指定傳輸方式爲TFramedTransport。

7.異步客戶端

編寫服務端代碼：HelloServerDemo.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import org.apache.thrift.TProcessor; 

4 import org.apache.thrift.protocol.TCompactProtocol; 

5 import org.apache.thrift.server.TNonblockingServer; 

6 import org.apache.thrift.server.TServer; 

7 import org.apache.thrift.transport.TFramedTransport; 

8 import org.apache.thrift.transport.TNonblockingServerSocket; 

9   

10 /** 

11  * blog http://www.micmiu.com 

12  * 

13  * @author Michael 

14  * 

15  */ 

16 public class HelloServerDemo { 

17     public static final int SERVER_PORT = 8090; 

18   

19     public void startServer() { 

20         try { 

21             System.out.println("HelloWorld TNonblockingServer start ...."); 

22   

23             TProcessor tprocessor = new HelloWorldService.Processor<HelloWorldService.Iface>( 

24                     new HelloWorldImpl()); 

25   

26             TNonblockingServerSocket tnbSocketTransport = new TNonblockingServerSocket( 

27                     SERVER_PORT); 

28             TNonblockingServer.Args tnbArgs = new TNonblockingServer.Args( 

29                     tnbSocketTransport); 

30             tnbArgs.processor(tprocessor); 

31             tnbArgs.transportFactory(new TFramedTransport.Factory()); 

32             tnbArgs.protocolFactory(new TCompactProtocol.Factory()); 

33   

34             // 使用非阻塞式IO，服務端和客戶端須要指定TFramedTransport數據傳輸的方式 

35             TServer server = new TNonblockingServer(tnbArgs); 

36             server.serve(); 

37   

38         } catch (Exception e) { 

39             System.out.println("Server start error!!!"); 

40             e.printStackTrace(); 

41         } 

42     } 

43   

44     /** 

45      * @param args 

46      */ 

47     public static void main(String[] args) { 

48         HelloServerDemo server = new HelloServerDemo(); 

49         server.startServer(); 

50     } 

51   

52 } 
編寫客戶端Client代碼：HelloAsynClientDemo.java

查看源代碼打印幫助
1 package com.micmiu.thrift.demo; 

2   

3 import java.util.concurrent.CountDownLatch; 

4 import java.util.concurrent.TimeUnit; 

5   

6 import org.apache.thrift.TException; 

7 import org.apache.thrift.async.AsyncMethodCallback; 

8 import org.apache.thrift.async.TAsyncClientManager; 

9 import org.apache.thrift.protocol.TCompactProtocol; 

10 import org.apache.thrift.protocol.TProtocolFactory; 

11 import org.apache.thrift.transport.TNonblockingSocket; 

12 import org.apache.thrift.transport.TNonblockingTransport; 

13   

14 import com.micmiu.thrift.demo.HelloWorldService.AsyncClient.sayHello_call; 

15   

16 /** 

17  * blog http://www.micmiu.com 

18  * 

19  * @author Michael 

20  * 

21  */ 

22 public class HelloAsynClientDemo { 

23   

24     public static final String SERVER_IP = "localhost"; 

25     public static final int SERVER_PORT = 8090; 

26     public static final int TIMEOUT = 30000; 

27   

28     /** 

29      * 

30      * @param userName 

31      */ 

32     public void startClient(String userName) { 

33         try { 

34             TAsyncClientManager clientManager = new TAsyncClientManager(); 

35             TNonblockingTransport transport = new TNonblockingSocket(SERVER_IP, 

36                     SERVER_PORT, TIMEOUT); 

37   

38             TProtocolFactory tprotocol = new TCompactProtocol.Factory(); 

39             HelloWorldService.AsyncClient asyncClient = new HelloWorldService.AsyncClient( 

40                     tprotocol, clientManager, transport); 

41             System.out.println("Client start ....."); 

42   

43             CountDownLatch latch = new CountDownLatch(1); 

44             AsynCallback callBack = new AsynCallback(latch); 

45             System.out.println("call method sayHello start ..."); 

46             asyncClient.sayHello(userName, callBack); 

47             System.out.println("call method sayHello .... end"); 

48             boolean wait = latch.await(30, TimeUnit.SECONDS); 

49             System.out.println("latch.await =:" + wait); 

50         } catch (Exception e) { 

51             e.printStackTrace(); 

52         } 

53         System.out.println("startClient end."); 

54     } 

55   

56     public class AsynCallback implements AsyncMethodCallback<sayHello_call> { 

57         private CountDownLatch latch; 

58   

59         public AsynCallback(CountDownLatch latch) { 

60             this.latch = latch; 

61         } 

62   

63         @Override 

64         public void onComplete(sayHello_call response) { 

65             System.out.println("onComplete"); 

66             try { 

67                 // Thread.sleep(1000L * 1); 

68                 System.out.println("AsynCall result =:" 

69                         + response.getResult().toString()); 

70             } catch (TException e) { 

71                 e.printStackTrace(); 

72             } catch (Exception e) { 

73                 e.printStackTrace(); 

74             } finally { 

75                 latch.countDown(); 

76             } 

77         } 

78   

79         @Override 

80         public void onError(Exception exception) { 

81             System.out.println("onError :" + exception.getMessage()); 

82             latch.countDown(); 

83         } 

84     } 

85   

86     /** 

87      * @param args 

88      */ 

89     public static void main(String[] args) { 

90         HelloAsynClientDemo client = new HelloAsynClientDemo(); 

91         client.startClient("Michael"); 

92   

93     } 

94   

95 } 
先運行服務程序，再運行客戶端程序，測試結果以下：

Client start .....
call method sayHello start ...
call method sayHello .... end
onComplete
AsynCall result =:Hi,Michael welcome to my blog www.micmiu.com
latch.await =:true
startClient end.———— 

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