rpc

GWT - RPC SerializationException

北城余情 提交于 2019-11-26 20:26:50
问题 It's been a while since I've been doing GWT and I needed something small done quickly. I set things up and now I have a RPC I need, but it fails. The RPC is supposed to give me a ArrayList, and Vacancy is located in #projectname#.client.model. The call is made in #projectname#.client.model. The interfaces for my Services are in #project#name.client.Service. Finally, the calls of course go to #projectname#.server. Vacancy implements IsSerializable. The Exception I get from running my RPC is

inter jvm communication [closed]

蹲街弑〆低调 提交于 2019-11-26 20:03:29
问题 I am looking for an inter-process communication library in Java. I am looking to send small messages between JVMs and would like to do it using shared memory if I could. 回答1: Java NIO has support for memory-mapped files. If multiple JVMs memory-map the same file they can use it as shared memory. Here is an example of memory mapping a file. try { int shmSize = 1024; RandomAccessFile file = new RandomAccessFile("shm.raw","rw"); // inialize file size if(file.length() < shmSize) { byte[] tmp =

rpc和webservice的关系简述

旧城冷巷雨未停 提交于 2019-11-26 19:37:46
RPC(Remote Procedure Call,远程过程调用)是一个很大的概念。它是一种通过网络从远程计算机程序上跨语言跨平台的请求服务。RPC能省略部分接口代码的开发,可以跨机器之间访问对象(Java RMI),可以有更方便的加密和更高效的数据传输性能,而不需要了解底层网络技术的协议。RPC不仅可以走HTTP/HTTPS,也可以自定义TCP协议,从而省略HTTP繁杂的规则和冗余信息。 WebService是一种跨编程语言和跨操作系统平台的远程调用技术,实际上就是RPC调用的一种实现。 常用的RPC框架有Dubbo、RML、Grpc、Hessian等。 RPC的主要作用是解决分布式系统中服务之间的调用问题,能够在远程调用时,像调用本地方法一样方便,让调用者感知不到远程调用的逻辑。RPC主要是用在大型企业里面,因为大型企业里面系统繁多,业务线复杂,而且效率优势非常重要。而由于小型企业一般业务简单,不需要进行分布式架构,小型企业主要还是使用WebService中的RESTful WebService,部分特殊业务会使用Soap WebService。 "听到你要离开了,我的心突然有点疼。" 来源: https://www.cnblogs.com/yanggb/p/10872762.html

REST vs JSON-RPC?

拥有回忆 提交于 2019-11-26 17:59:46
I'm trying to chose between REST and JSON-RPC for developing an API for a web application. Which one is easier to use for API clients? Update 2015: I have found REST easier to develop and use for an API which is served on Web/HTTP, because the existing and mature HTTP protocol which is understood by both client and server can be leveraged by the API. For example response codes, headers, queries, post bodies, caching and many other features can be used by the API without any additional effort or setup. ioseb The fundamental problem with RPC is coupling. RPC clients become tightly coupled to

有趣的RPC理解

孤者浪人 提交于 2019-11-26 16:10:19
RPC(Remote Procedure Call)—远程过程调用,它是一种通过网络从远程计算机程序上请求服务,而不需要了解底层网络技术的协议。RPC协议假定某些传输协议的存在,如TCP或UDP,为通信程序之间携带信息数据。在OSI网络通信模型中,RPC跨越了传输层和应用层。RPC使得开发包括网络分布式多程序在内的应用程序更加容易。 以上一段话,摘自百度词条,是不是觉得一大堆,很烦;下面给你举个列子,管保你清晰明了: “本地过程调用,就好比你现在在家里,你要想洗碗,那你直接把碗放进洗碗机,打开洗碗机开关就可以洗了。这就叫本地过程调用。” “远程嘛,那就是你老婆现在不在家,跟姐妹们浪去了,突然发现碗还没洗,打了个电话过来,叫你去洗碗,然后你就乖乖的去洗了,这就是远程过程调用啦”    来源: https://www.cnblogs.com/pretttyboy/p/11325806.html

What is the difference between Serialization and Marshaling?

喜你入骨 提交于 2019-11-26 14:57:23
问题 I know that in terms of several distributed techniques (such as RPC), the term "Marshaling" is used but don't understand how it differs from Serialization. Aren't they both transforming objects into series of bits? Related: What is Serialization? What is Object Marshalling? 回答1: Marshaling and serialization are loosely synonymous in the context of remote procedure call, but semantically different as a matter of intent. In particular, marshaling is about getting parameters from here to there,

What is the current choice for doing RPC in Python? [closed]

时光总嘲笑我的痴心妄想 提交于 2019-11-26 14:50:36
Actually, I've done some work with Pyro and RPyC, but there is more RPC implementation than these two. Can we make a list of them? Native Python-based protocols: PyRo4 (Python Remote Objects) RPyC (Remote Python Call) Circuits RPC frameworks with a lot of underlying protocols: Spyne (see lightning talk ) JSON-RPC based frameworks: python-symmetric-jsonrpc rpcbd Ladon jsonrpc2-zeromq-python SOAP: ZSI SOAPpy Ladon Spyne XML-RPC based frameworks: XMLRPC, using the xmlrpclib and SimpleXMLRPCServer modules in the standard library. Others: WAMP (RPC + PubSub, JSON + MsgPack) Twisted Spread ZMQRPC

What is RPC framework and Apache Thrift?

冷暖自知 提交于 2019-11-26 14:06:27
I need to learn Apache Thrift for a University project. As this tutorial says, it is an RPC framework, and it was the only document I could find for Thrift other than their documentation . Can someone tell me what is a RPC framework and how does this relate to Apache Thrift? An RPC framework in general is a set of tools that enable the programmer to call a piece of code in a remote process, be it on a different machine or just another process on the same machine. In the particular case of Apache Thrift , we talk about a framework designed to be efficient, and available across both OS platforms

Git fails when pushing commit to github

情到浓时终转凉″ 提交于 2019-11-26 14:03:06
I cloned a git repo that I have hosted on github to my laptop. I was able to successfully push a couple of commits to github without problem. However, now I get the following error: Compressing objects: 100% (792/792), done. error: RPC failed; result=22, HTTP code = 411 Writing objects: 100% (1148/1148), 18.79 MiB | 13.81 MiB/s, done. Total 1148 (delta 356), reused 944 (delta 214) From here it just hangs and I finally have to CTRL + C back to the terminal. I had the same issue and believe that it has to do with the size of the repo (edited- or the size of a particular file) you are trying to

NFS服务的介绍与具体配置

时光毁灭记忆、已成空白 提交于 2019-11-26 13:06:27
一、NFS的介绍 1.概念:它的主要功能是通过网络让不同的主机系统之间可以彼此共享文件或目录。NFS服务器 端共享的数据文件目录挂载到NFS客户端本地系统中(就是某个挂载点下)。从NFS客 户端自己的磁盘分区或者目录一样,而实际上是篡改段的服务器目录。 NFS网络文件系统的使用很像windows系统的网络共享,安全共呢个,网络驱动器映射, 这也和Linux里的samba服务类似。 2.NFS在企业中的应用场景 在企业集群架构的工作场景中,NFS网络文件系统一般被用于存储共享视频、图片、 附件等静态资源文件 二、为什么需要有共享存储   1.共享存储解决了多台服务器需要数据同步的操作,也就是把文件存在后台的共享存储服务器上, 通过前端网页服务器访问。   提示:中小型互联网公司企业一般不会买硬件存储太贵了,大公司如果发展很快的话,可能会 临时买存储顶一下网站压力,当网站并发继续增大后,硬件存储扩展就相对费劲。 三、NFS挂载原理详细介绍    提示:mount 源 目标 mount 远端地址:/共享目录 /挂载目录    问题:nfs传输端口不固定,导致客户端不知道那个端口进行数据传输    解决方案:就是RPC(中文意识就是远程过程调用)协议/服务来实现的, 四、什么是RPC(中间人 )    因为NFS支持的功能相当多,而不同的功能都会使用不同的程序来启动,每启动一个功能都会启用