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MessagePosté le: Mer 10 Jan - 18:55 (2018)    Sujet du message: Facebook Coded In C Répondre en citant




Facebook Coded In C
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Share what's new in your life on your Timeline. template using Callback = std::function ; Output fooSync(Input); void fooAsync(Input, Callback );This is the traditional way of expressing asynchronous computation. This state of affairs is affectionately referred to as "callback hell."Futures A future is an object that represents the result of an asynchronous computation, which may not yet be available. For instance, the filter model in the HTTP server allows you to easily compose common behaviors defined in small chunks of code that are easily unit testable. Building an in-house HTTP stack gave us the flexibility to iterate quickly on these features.Initially kicked off in 2011 by a few engineers who were passionate about seeing HTTP usage at Facebook evolve, Proxygen has been supported since then by a team of three to four people. For instance, being able to administer our HTTP infrastructure with tools such as Thrift simplifies integration with existing systems. They describe the changes they made and the benefits in more detail in their blog post.The next case study is a real service that is one piece of constructing the Facebook News Feed. We are also iterating and developing support for HTTP/2.Proxygen is not designed to replace Apache or nginx those projects focus on building extremely flexible HTTP servers written in C that offer good performance but almost overwhelming amounts of configurability. We initially planned for Proxygen to be a software library for generating proxies, hence the name. With just a few options, you are ready to go. We want to help more people build and deploy high performance C++ HTTP services, and we believe that Proxygen is a great framework to do so. We wanted a platform for building and delivering event-driven networking libraries to other projects. RPC exception), // use an empty response and move on. Now we've reached a point where we are ready to share this code more widely.ArchitectureThe core HTTP layer is split into a four-part abstraction: the session, the codec, the transaction, and the handler. As an example: #include using folly::Future; // Do foo asynchronously; immediately return a Future for the output Future fooFuture(Input); Future f = fooFuture(input); // f may not have a value (or exception) yet. If you are passionate about HTTP, high performance networking code, and modern C++, we would be excited to work with you! Please send us pull requests on GitHub.We're committed to open source and are always looking for new opportunities to share our learnings and software. The traffic team has now open sourced Thrift as well as Proxygen, two important components of the network software infrastructure at Facebook. We ran the client on the same machine to eliminate network effects, and achieved the following performance numbers. Additionally, by using non-blocking IO and Linux's epoll under the hood, we are able to create a memory and CPU efficient server.HTTP ServerThe server framework we've included with the release is a great choice if you want to get set up quickly with a simple, fast-out-of-the-box event driven server. Please try again.BirthdayMonthJanFebMarAprMayJunJulAugSepOctNovDecDay12345678910111213141516171819202122232425262728293031Year201820172016201520142013201220112010200920082007200620052004200320022001200019991998199719961995199419931992199119901989198819871986198519841983198219811980197919781977197619751974197319721971197019691968196719661965196419631962196119601959195819571956195519541953195219511950194919481947194619451944194319421941194019391938193719361935193419331932193119301929192819271926192519241923192219211920191919181917191619151914191319121911191019091908190719061905Why do I need to provide my birthday?FemaleMaleBy clicking Create Account, you agree to our Terms and that you have read our Data Policy, including our Cookie Use. Want to work with us? Join the team, we're hiring! Here are some of our current open positions: Software Engineer, AndroidSolutions Engineer, SMBSoftware Engineer, Product (Full Stack)Machine Learning Software Engineer, Building 8SoC Architect - Oculus Core Tech TeamConnectFollow us on TwitterKeep UpdatedStay up-to-date via RSS with the latest open source project releases from Facebook, news from our Engineering teams, and upcoming events.Subscribe. The library has been battle-tested with many, many trillions of HTTP(S) and SPDY requests. ConclusionFolly Futures bring robust, powerful, and performant futures to C++11. For each connection, a session is created. But eventually it will. (The implementation of collect relies on you guessed it then.) There are many other compositional building blocks, including collectAny, collectN, map, and reduce. Want to work with us? Join the team, we're hiring! Here are some of our current open positions: Software Engineer, Data PrivacyManager, Software Engineering - PlatformSoftware Engineer - Social VR PlatformSoftware Engineer, Security (Data Privacy)Software Engineer, Public SafetyConnectFollow us on TwitterKeep UpdatedStay up-to-date via RSS with the latest open source project releases from Facebook, news from our Engineering teams, and upcoming events.Subscribe. The result is wasted resources, reduced throughput, and increased latency (because requests are in a queue, waiting to be serviced).It is more efficient to make service A asynchronous, meaning that while B is busy computing its answer, A has moved on to service other requests. asyncB(outputA, [=](OutputB outputB) { // . . 5a02188284
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