rpc | 易学教程

errors in GWT Hibernate program 2

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问题 I manage to solve this problem getting hint from post stackoverflow post about GWT. The post tells that as JDBC shouldn'e be on client side, rather on server side. I am trying to make a simple web application that adds a user to database using GWT RPC with Hibernate, MySql & eclipse IDE. I have already a simple version of hibernate program running & now I am trying to do same using GWT RPC. Though probably there are certain different practices when using hibernate with RPC. Firstly I had to

ZeroMQ REQ/REP on ipc:// and concurrency

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问题 I implemented a JSON-RPC server using a REQ/REP 0MQ ipc:// socket and I'm experiencing strange behavior which I suspect is due to the fact that the ipc:// underlying unix socket is not a real socket, but rather a single pipe. From the documentation, one has to enforce strict zmq_send()/zmq_recv() alternation, otherwise the out-of-order zmq_send() will return an error. However, I expected the enforcement to be per-client, not per-socket. Of course with a Unix socket there is just one pipeline

RPC Authentication

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问题 I'm working on communicating data on local machine using Remote Procedure Calls ( RPC ). My requirement is use RPC to communicate data between two processed, but server should authenticate client by some means. I came across RpcBindingSetAuthInfo which set authentication and authorization information. The fourth parameter is authentication service which can be anything from http://msdn.microsoft.com/en-us/library/windows/desktop/aa373556(v=vs.85).aspx WINNT authentication is not applicable in

Fast and scalable RPC between C# and CPython

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问题 I need some feedback on C# - cPython integration for scientific application. The scenario is the following: C# for data acquisition and visualization - CPython for data manipulation using several and changing third part library to implement domain specific tasks. General use case: C# code get realtime data from device C# code pass data to cPython code and ask for elaboration Cpython code does the magic Cpython code pass result back to c# code C# visualizes data in a WPF application Both c#

“endpoint is a duplicate” when starting an RPC server

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问题 My program uses Microsoft RPC for interprocess communications. To prepare for receiving RPC calls the program runs the following sequence: RpcServerUseProtseqEp(), then RpcServerRegisterIf(), then RpcServerListen() The program starts its RPC server with the sequence above, works for some time, then terminates and may later be restarted by another program. The set of parameters values for RpcServerUseProtseqEp() is the same each time the program is run. When the sequence is run the first time

RPC Client gives Can't encode arguments

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问题 I'm trying to write the simpliest client in RPC with this code: #include <stdio.h> #include <stdlib.h> #include <rpc/rpc.h> int main(int argc, char *argv[]){ int stat; char out; char in='f'; if(stat=callrpc(argv[1],0x20000001, 1, 1, (xdrproc_t)xdr_void, &in, (xdrproc_t)xdr_char, &out)!=0){ clnt_perrno(stat); exit(1); } exit(0); } It compiles, but when I try to run it, it gives me a "RPC: Can't encode arguments" EDIT: Actually the server do not recieve any argument neither it send back

Handling Apache Thrift list/map Return Types in C++

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问题 First off, I'll say I'm not the most competent C++ programmer, but I'm learning, and enjoying the power of Thrift. I've implemented a Thrift Service with some basic functions that return void, i32, and list. I'm using a Python client controlled by a Django web app to make RPC calls and it works pretty well. The generated code is pretty straight forward, except for list returns: .thrift description file: namespace cpp Remote enum N_PROTO { N_TCP, N_UDP, N_ANY } service Rcon { i32 ping() i32

Can't Encode Arguments in Remote Procedure Call for Server Registration

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问题 I'm going a bit crazy trying to figure out why this isn't working. I'm using sunrpc, but the generated server code throws the following: Cannot register service: RPC: Can't encode arguments unable to register (MYRPC, MYRPC_V1, udp). I have no idea why this is happening. I'm doing the following to generate the stubs: $ rpcgen -NMC myrpc.x Here's my XDR struct imgdata{ opaque data<>; }; program MYRPC { version MYRPC_V1 { imgdata minify(imgdata) = 1; } = 1; } = 0x30D0D0DFF; I don't get any

Java RMI for remote ip (host)

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问题 I am newbie. I cannot understand RMI correctly. There are tons of tutorials available on the internet ,but all of them are for the local host as I can understand. Both server and client run on the same machine. I want to run client on any machine and the host will be on the one computer lets consider IP - 11.11.11.11 . On the 1099 . But how can I achieve this, where should I specify my IP on the client side. As I understand naming convertion is used, like DNS but anyway when I need to connect

第6章 RPC之道

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　　 6.1 认识RPC 　　　　分布式、微服务的架构思维中都不能缺少 RPC 的影子　　　　　 RPC（Remote Procedure Call）远程过程调用。通过网络在跨进程的两台服务器之间传输信息，我们使用的时候不用关心网络底层的实现，通过RPC调用远程服务就像本地调用系统内部方法一样方便。　　　　　在 OSI 网络通信模型中，RPC跨越了传输层和应用层，使开发分布式应用程序变得非常方便。　　　　　RPC基本的调用过程如下图。客户端发起一个 RPC请求，本地调用 client stub 负责将调用的接口、方法和参数按照事先约定好的协议进行序列化，然后由 RPC 框架的 RPCRuntime 实例通过 socket 传输到远程服务器上。　　　　　远程服务器端 RPCRuntime 实例收到请求后再通过 server stub 进行反序列化，发起最终的 server method 调用。　　　　　　一个良好的 RPC框架要兼具可靠性和易用性，可靠性方面要保证 I/O、序列化等准确处理，还要考虑网络的不确定性，心跳、网络闪断等因素；易用性方面要考虑超时与重试机制的控制，同步和异步调用的使用等。以上都是考量一个 RPC框架好坏的标准。　　　　　　目前有很多优秀的开源 RPC框架，比如国内的 Dubbo（阿里）、Motan（新浪微博）等。　　6.2