Thrit用的不多，也不够深入，这里小记一笔。
关于Thrift环境如何安装，可以参考官网。
或者直接下载windows版本的thrift-0.9.2.exe
Thrit跟Java有数据类型的映射关系：
/** * The first thing to know about are types. The available types in Thrift are: * * bool Boolean, one byte * byte Signed byte * i16 Signed 16-bit integer - short * i32 Signed 32-bit integer - int * i64 Signed 64-bit integer - long * double 64-bit floating point value - double * string String * binary Blob (byte array) * map<t1,t2> Map from one type to another * list<t1> Ordered list of one type * set<t1> Set of unique elements of one type */
我就不罗嗦了了，能看到这里的都能自动理解。
RPC的核心就是传参调用，参数抛不开基本数据类型、集合，更常用的是自定义对象。
在Thrift中，需要将自定义对象预先定义，类似于C语言编译要求。或者可以include其他thrift文件。
这里用Profile作为对象载体，这里Java的class对应Thrit中的struct，interface对应service。
做一个操作Profile的接口实现，代码如下：
namespace java org.zlex.support.thrift
struct Profile {
1: string name,
2: i32 score,
3: bool enable
}
service ProfileService {
string updateName(1:Profile profile, 2:string name)
i32 updateScore(1:Profile profile, 2:i32 score)
map<string,string> toMap(1:Profile profile)
}
保存为Profile.thrift
执行命令，生成Java代码：
thrift -r -gen java Profile.thrift
生成的代码详见附件。自动生成的代码中，冗余还是不少。修改代码的冲动闪过，保持原生态。
针对接口做个实现类：
/**
* Mar 14, 2013
*/
package org.zlex.support.thrift.impl;
import java.util.HashMap;
import java.util.Map;
import org.apache.thrift.TException;
import org.zlex.support.thrift.Profile;
import org.zlex.support.thrift.ProfileService.Iface;
/**
*
* @author snowolf
* @version 1.0
* @since 1.0
*/
public class ProfileServiceImpl implements Iface {
/*
* (non-Javadoc)
*
* @see
* org.zlex.support.thrift.ProfileService.Iface#updateName(org.zlex.support
* .thrift.Profile, java.lang.String)
*/
@Override
public String updateName(Profile profile, String name) throws TException {
profile.setName(name);
return profile.getName();
}
/*
* (non-Javadoc)
*
* @see
* org.zlex.support.thrift.ProfileService.Iface#updateScore(org.zlex.support
* .thrift.Profile, int)
*/
@Override
public int updateScore(Profile profile, int score) throws TException {
profile.setScore(profile.getScore() + score);
return profile.getScore();
}
/*
* (non-Javadoc)
*
* @see
* org.zlex.support.thrift.ProfileService.Iface#toMap(org.zlex.support.thrift
* .Profile)
*/
@Override
public Map<String, String> toMap(Profile profile) throws TException {
Map<String, String> map = new HashMap<String, String>();
map.put("name", profile.getName());
map.put("score", "" + profile.getScore());
map.put("isEnable", "" + profile.isEnable());
return map;
}
}
做一个Server实现，“非阻塞&高效二进制编码”：
/**
* Mar 14, 2013
*/
package org.zlex.support.thrift;
import org.apache.log4j.Logger;
import org.apache.thrift.TProcessorFactory;
import org.apache.thrift.protocol.TCompactProtocol;
import org.apache.thrift.server.THsHaServer;
import org.apache.thrift.server.TServer;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TNonblockingServerSocket;
import org.apache.thrift.transport.TTransportException;
import org.zlex.support.thrift.impl.ProfileServiceImpl;
/**
*
* @author snowolf
* @version 1.0
* @since 1.0
*/
public class Server {
/**
* Logger for this class
*/
private static final Logger logger = Logger.getLogger(Server.class);
/**
*
*/
private int port;
/**
* @param port
*/
public Server(int port) {
this.port = port;
}
/**
*
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public void start() {
try {
TNonblockingServerSocket socket = new TNonblockingServerSocket(port);
final ProfileService.Processor processor = new ProfileService.Processor(
new ProfileServiceImpl());
THsHaServer.Args arg = new THsHaServer.Args(socket);
// 高效率的、密集的二进制编码格式进行数据传输
// 使用非阻塞方式，按块的大小进行传输，类似于 Java 中的 NIO
arg.protocolFactory(new TCompactProtocol.Factory());
arg.transportFactory(new TFramedTransport.Factory());
arg.processorFactory(new TProcessorFactory(processor));
TServer server = new THsHaServer(arg);
logger.info("服务启动-使用:非阻塞&高效二进制编码");
server.serve();
} catch (TTransportException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}
服务器测试用例：
/**
* Mar 14, 2013
*/
package org.zlex.support.thrift;
import org.junit.Before;
import org.junit.Test;
/**
*
* @author snowolf
* @version 1.0
* @since 1.0
*/
public class ServerTest {
public final static int PORT = 9999;
private Server server;
@Before
public void init() {
server = new Server(PORT);
}
@Test
public void test() {
server.start();
}
}
客户端测试用例：
/**
* Mar 14, 2013
*/
package org.zlex.support.thrift;
import static org.junit.Assert.*;
import java.util.Map;
import org.apache.thrift.TApplicationException;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TCompactProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
import org.junit.Test;
/**
*
* @author snowolf
* @version 1.0
* @since 1.0
*/
public class ClientTest {
public final static int PORT = 9999;
public static final String address = "localhost";
public static final int clientTimeout = 30000;
@Test
public void test() {
TTransport transport = new TFramedTransport(new TSocket(address, PORT,
clientTimeout));
TProtocol protocol = new TCompactProtocol(transport);
ProfileService.Client client = new ProfileService.Client(protocol);
try {
transport.open();
Profile profile = new Profile();
profile.setName("Snowolf");
Map<String, String> map = client.toMap(profile);
assertEquals(map.get("name"),"Snowolf");
} catch (TApplicationException e) {
System.out.println(e.getMessage() + " " + e.getType());
} catch (TTransportException e) {
e.printStackTrace();
} catch (TException e) {
e.printStackTrace();
}
transport.close();
}
}
Client调用Server接口，将Profile对象交由Server处理，转换为Map。
如果需要Thirft承载高并发的负载，可以通过nginx来完成负载均衡的实现，详见
Nginx扩展（一）：nginx_tcp_proxy_module
小记完毕，Go Home！