rpc | 易学教程

Is it appropriate to use message queues for synchronous rpc calls via ajax

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问题 I have a web application that uses the jquery autocomplete plugin, which essentially sends via ajax a request containing text that has been typed into a textbox to our web server, once the web server receives this request, it is then handed off to rabbitmq. I know that we do get benefits from using messaging, but it seems like using it for blocking rpc calls is a misuse and that something like WCF is far more appropriate in this instance, is this the case or is it considered acceptable

Java RMI与RPC的区别

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文章转自http://www.cnblogs.com/ygj0930/p/6542811.html 一：RPC 远程过程调用 RPC（Remote Procedure Call Protocol）远程过程调用协议，通过网络从远程计算机上请求调用某种服务。一次RPC调用的过程大概有10步：　　1.执行客户端调用语句，传送参数　　2.调用本地系统发送网络消息　　3.消息传送到远程主机　　4.服务器得到消息并取得参数　　5. 根据调用请求以及参数执行远程过程（服务）　　6.执行过程完毕，将结果返回服务器句柄　　7.服务器句柄返回结果，调用远程主机的系统网络服务发送结果　　8.消息传回本地主机　　9.客户端句柄由本地主机的网络服务接收消息　　10.客户端接收到调用语句返回的结果数据二：RMI 远程方法调用 RMI:远程方法调用(Remote Method Invocation)。能够让在客户端 Java 虚拟机上的对象像调用本地对象一样调用服务端java 虚拟机中的对象上的方法。 RMI远程调用步骤： 1，客户调用客户端辅助对象stub上的方法 2，客户端辅助对象stub打包调用信息（变量，方法名），通过网络发送给服务端辅助对象skeleton 3，服务端辅助对象skeleton将客户端辅助对象发送来的信息解包，找出真正被调用的方法以及该方法所在对象 4

Why does NFS use UDP by default?

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问题 I'm sure there's some ancient legacy reason for it, but what is it? It seems like a service that's geared towards reliable data delivery. 回答1: NFS was originally designed to be used on a LAN where loss rates are very low. UDP is faster, and has less overhead NFS is stateless, so it's simple for clients to retry Note that NFS v3+ can use TCP. 回答2: UDP is the default for NFSv2 (which nobody should really use these days) but NFSv3 use TCP by default. TCP mounts are more reliable and you know you

MessagePack: fast cross-platform serializer and RPC - please share experience

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问题 Looking for some fast, simple and stable RPC library I stumbled upon MessagePack project which seems to be very good. It is also under active development. If you used it in any way, could you please share your experience? P.S. I think this question should be community wiki 回答1: Well, after some time I found that MessagePack is not well-documented (there was even non-working tutorial in Wiki for Java), there are like 7 outstanding bugs several months old without any replies. Code even is not

MessagePack: fast cross-platform serializer and RPC - please share experience

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What RPC module should I use to implement RCP in Python and be able to change connection method later?

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问题 I do have to implement some RPC from Python to Python but the connection methods are quite limited for security reasons. Currently it seems that I may be able to connect using SSH and run a single python script on the remote system. This can change in the future when we may have to connect using something else, maybe telnet so I would like a solution that can work using different protocols. Another potential limitation is regarding Python version, it has to work with Python 2.5-2.7 even if

gwt java.lang.ExceptionInInitializerError

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问题 I'm working on a GWT app, and keep getting the error shown below. I followed the GWT tutorial regarding naming conventions for servlet classes, and followed the Service / Async / ServiceImpl structure. I also tried adding the -XX:-UseSplitVerifier VM argument to fix a previous problem. any ideas on what's going on? SEVERE: javax.servlet.ServletContext log: Exception while dispatching incoming RPC call java.lang.ExceptionInInitializerError at sun.reflect.NativeConstructorAccessorImpl

SSL certificate problem in a web service proxy

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问题 I am building a JAVA web service client in which i connect to a service. This service has a ssl certificate verification. How to call this service using ssl certificate verification. I am using JAX-RPC implementation in client built using Eclipse. An example would be appriciated. 回答1: I am able to do the web service connection... I added the key store using the command: keytool -import -trustcacerts -file <file path/filename.cer> -alias <aliasName> -keystore <JAVA_HOME/jre/lib/security

微服务之集成(四)

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1. 寻找理想的集成技术微服务之间通信的方式的选择非常多样化，但哪个是正确的呢？SOAP ? XML-RPC ? REST ? Protocol Buffers?后面会逐一讨论。首先，我们要考虑的是，我们到底希望从这些技术中得到什么。 1.1 避免破坏性修改有时候，对某个服务做的一些修改会导致该服务的消费方也随之发生改变。但是，我们希望选用的技术可以尽量避免这种情况的发生。 1.2 保证API的技术无关性保证微服务之间的通信方式的技术无关性是非常重要的。这就意味着，不应该选择哪种对微服务的具体实现技术有限制的集成方式。 1.3 使你的服务易于消费方使用消费方应该很容易的使用我们的服务。理想情况下，消费方应该可以使用任何技术来实现，从另一方面来说，提供一个客户端库也可以简化消费方的使用。但是通常这种库与其他我们想要得到的东西不可兼得。例如，使用客户端库对于消费方来说很方便，但是会造成耦合的增加。 1.4 隐藏内部实现细节我们不希望消费方与服务的内部实现细节绑定在一起，因为这会增加耦合。所以，所有倾向于暴露内部实现细节的技术都不应该被采用。 2.为用户创建接口 3.共享数据库目前业界最常见的集成形式应该就是数据库集成了。使用这种方式时，如果其他服务想要从一个服务获取信息，可以直接访问数据库。如果想要修改，也可以直接在数据库中修改。这种方式看起来非常简单

RPC frameworks available?

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问题 I am looking to use a RPC framework for internal use. The framework has to be cross language. I am exploring Apache Thrift right now. Google protocol Buffers does not provide RPC capabilities exactly. What are the choices I have got apart from Thrift. (my servers will be primarily Java and the clients will be Java, Python, PHP). 回答1: There is also MessagePack which claims to be faster than Protocol Buffers and have more features than Thrift. 回答2: I would look at REST as a first option because