【RPC框架探索】（一）ICE框架的探索

本文主要是介绍【RPC框架探索】（一）ICE框架的探索，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

【1】基于Linux CentOS-7的安装

cd /etc/yum.repos.dsudo 
wget https://zeroc.com/download/rpm/zeroc-ice-el7.reposudo 
yum install ice-all-runtime ice-all-devel

【2】编写一个基本的slice，保存为Printer.ice

module Demo {interface Printer {void printString(string s);};
};

编译slice

$ mkdir generated
$ slice2java --output-dir generated Printer.ice

编写一个基本实现

public class PrinterI extends Demo._PrinterDisp {public voidprintString(String s, Ice.Current current){System.out.println(s);}
}

【2】编写Server代码

public class Server {public static voidmain(String[] args){int status = 0;Ice.Communicator ic = null;try {ic = Ice.Util.initialize(args);Ice.ObjectAdapter adapter =ic.createObjectAdapterWithEndpoints("SimplePrinterAdapter", "default -p 10000");Ice.Object object = new PrinterI();adapter.add(object, ic.stringToIdentity("SimplePrinter"));adapter.activate();ic.waitForShutdown();} catch (Ice.LocalException e) {e.printStackTrace();status = 1;} catch (Exception e) {System.err.println(e.getMessage());status = 1;}if (ic != null) {// Clean up//try {ic.destroy();} catch (Exception e) {System.err.println(e.getMessage());status = 1;}}System.exit(status);}
}

编译代码

$ mkdir classes
$ javac -d classes -classpath classes:/usr/share/java/ice.jar \
Server.java PrinterI.java generated/Demo/*.java

这里注意想一下ice.jar的jar的位置，一定要是正确的位置

【3】编写Client代码

public class Client {public static voidmain(String[] args){int status = 0;Ice.Communicator ic = null;try {ic = Ice.Util.initialize(args);Ice.ObjectPrx base = ic.stringToProxy("SimplePrinter:default -p 10000");Demo.PrinterPrx printer = Demo.PrinterPrxHelper.checkedCast(base);if (printer == null)throw new Error("Invalid proxy");printer.printString("Hello World!");} catch (Ice.LocalException e) {e.printStackTrace();status = 1;} catch (Exception e) {System.err.println(e.getMessage());status = 1;}if (ic != null) {// Clean up//try {ic.destroy();} catch (Exception e) {System.err.println(e.getMessage());status = 1;}}System.exit(status);}
}

编译Client

$ javac -d classes -classpath classes:/usr/share/java/ice.jar \
Client.java PrinterI.java generated/Demo/*.java

【4】执行Server和Client

cd classes
java Server &
java Client &

出现错误

Error: A JNI error has occurred, please check your installation and try again

出现这个错误，检查发现CLASSPATH中没有设置ice.jar，搜索系统ice.jar，发现在/usr/share/java/ice.jar，将其添加到classpath中，问题解决，可以使用下面的脚本setenv.sh

#! /bin/bash

JAVA_HOME=/usr/java/jdk1.8.0_131
CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:/usr/share/java/ice.jar
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH

执行source setenv.sh，设置好相关变量

java Server &
java Client &

出现结果

Hello World!

调用成功
【5】使用python客户端调用java的服务端
安装pip和ice-python

sudo yum install python-pip
pip install zeroc-ice

出现错误

#include <Python.h>
compilation terminated.
error: command 'gcc' failed with exit status 1

安装python开发环境解决

sudo yum install python-devl

出现错误

#include <bzlib.h>
compilation terminated.
error: command 'gcc' failed with exit status 1

安装bzip2开发库

sudo yum install bzip2-devel

编译python版的ice文件

slice2py Printer.ice

编写python的Client.py

import sys, traceback, Ice
import Demostatus = 0
ic = None
try:ic = Ice.initialize(sys.argv)base = ic.stringToProxy("SimplePrinter:default -p 10000")printer = Demo.PrinterPrx.checkedCast(base)if not printer:raise RuntimeError("Invalid proxy")printer.printString("Hello World!")
except:traceback.print_exc()status = 1if ic:# Clean uptry:ic.destroy()except:traceback.print_exc()status = 1sys.exit(status)

然后直接调用

python Client.py

结果

Hello World!

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