BIG LIST OF WEBSITES

List of Top Websites on Completion

Top 250 Websites on COMPLETION

Download the Top 250 Websites to PDF

Last updated on Jul 1 2020.
Here are the best websites we found: edx.org • completionfund.com • barakah.com • oregonstudentaid.gov • egrabber.com • asite.com • ftpconcepts.com • doctoralnet.com • pcpartpicker.com

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edX | Free Online Courses by Harvard, MIT, & more. Access 2000 free online courses from 140 leading institutions worldwide. Gain new skills and earn a certificate of completion. Join today.
Alexa Rank
1,296
COMPLETION FUND - Home
Alexa Rank
317,043
Barakah | Dedicated to Highness the Aga Khan on the completion of his Diamond Jubilee through visual and textual expressions. Dedicated to Highness the Aga Khan on the completion of his Diamond Jubilee through visual and textual expressions
Alexa Rank
1,000,001
Office of Student Access and Completion - Helping Oregon Students Plan and Pay for College. OSAC is a state office that helps Oregonians plan and pay for college by providing scholarships and other financial aid, mentorship, informational resources, and more.
Alexa Rank
207,963
eGrabber - Automated List Building, Business Lead Generation, Email List Completion, Data Capture software for B2B Sales & Recruiting. eGrabber - World''s Best B2B Prospect List Building Tools - Generate 10x More Appointments. Purchased by 100K+ Companies. Call (866) 299-7314 to schedule a Demo.
Alexa Rank
166,386
Asite, the cloud platform for seamless collaboration across disciplines, from concept to completion and beyond.. The cloud platform for seamless collaboration across disciplines. Meet Adoddle. Cloud collaboration software and architecture, engineering and construction document management software.
Alexa Rank
671,837
FTP Concepts | Digital solutions: from concept to completion.
Alexa Rank
1,000,001
Improve Graduate Outcomes. Welcome to DoctoralNet Ltd. Our mission is to raise graduate retention and completion rates around the world.
Alexa Rank
1,000,001
Legion Precision. P320, Apex tactical, cerakote, glock, poly 80 completion kits, bulk mags, custom, sig sauer, blank slides, minimalist slides,
Alexa Rank
276,008
Tiffin University | Tiffin University. Tiffin University offers accredited, professional undergraduate, graduate and degree completion programs on campus and online through its schools of arts and sciences, business and criminal justice and social sciences.
Alexa Rank
420,299
ANC Education | Undergraduate & Postgraduate Education. Postgraduate programs, Postgraduate degrees, MBA, Postgraduate diploma, Undergraduate Degree Programs, Universities, American Universities, Australian Universities, HND.
Alexa Rank
1,000,001
College Scheduler by Civitas Learning | College Scheduling. Simplified.. Revolutionize student registration, one of the most critical points on the journey towards degree completion. Students can easily create optimal schedules.
Alexa Rank
46,304
Buy Tickets for Your Favorite Events – See Tickets US. See Tickets provides complete ticketing solutions for high volume events. From event conception to completion, we''ve got you covered.
Alexa Rank
66,934
medicinethroughtime.co.uk - resources for teachers and learners folowing the SHP GCSE development study in medicine through time. medicinethroughtime.co.uk provides resources and accessible narrative accounts of items relating to medicine through time. This site has been designed to support students, and teachers, in the completion of a SHP Development study of Medicine through time as part of a GCSE in History.
Alexa Rank
67,475
Oilfield Services - Halliburton. Halliburton is one of the world's largest providers of products and services to the energy industry. Halliburton helps its customers maximize value throughout the lifecycle of the reservoir from locating hydrocarbons and managing geological data, to drilling and formation evaluation, well construction and completion, and optimizing production throughout the life of the asset.
Alexa Rank
86,034
Jumpcut - Captivating Online Courses. Jumpcut creates captivating online courses. Online education today is fundamentally broken. Less than 10% of people who start an online course today finish it -- a completion rate that is unacceptable to us.
Alexa Rank
92,389
Home: Los Angeles Valley College. Los Angeles Valley College, home of the LAVC Monarchs, offers Associates of Art (AA) and Associates of Science (AS) degrees, certificates of completion, and skill certificates.
Alexa Rank
107,911
Desktop Documentaries: DIY Filmmaking, How To Make A Documentary. Tips, tricks and advice for making documentaries from start to completion.
Alexa Rank
109,064
Home - NVRE University. NVREU provides the training necessary to become a licensed real estate agent or a licensed home inspector in Virginia. Upon the completion of the training courses, the student will acquire the needed skills for a career in a high-demand field!
Alexa Rank
117,221
Form I-9 Compliance | Electronic Form I-9 & E-Verify Solutions. Electronic Form I-9 & E-Verify Solutions for your business. A solution for automating the completion, signature, storage & tracking of I-9 Forms & E-Verify
Alexa Rank
119,037
Muskingum University. Muskingum University is a liberal arts university offering an exceptional residential undergraduate experience and adult degree completion programs.
Alexa Rank
136,856
Digital Storage Oscilloscopes | Virtual Instruments | Critical test & measurement tools | RIGOL - Innovation or nothing. RIGOL Technologies is transforming the Test and Measurement Industry. Our premium line of products includes Digital and Mixed Signal Oscilloscopes, Spectrum Analyzers, Function/Arbitrary Waveform Generators, Programmable Power Supplies, Digital Multimeters, and Data Acquisition Systems. Our test solutions combine uncompromised product performance, quality, and advanced product features; all delivered at extremely attractive price points. This combination provides our customers with unprecedented value for their investment, reduces their overall cost of test, and helps speed time to completion of their designs or projects.
Alexa Rank
139,473
World Oil - Upstream News | Technology | Exploration | Drilling | Production | Statistics | Big Data | Oil Prices | Events. World Oil provides news, oil prices, data, statistics, shale reports and upstream industry trends relating to the exploration, drilling, completion and production of oil and gas, both onshore and offshore.
Alexa Rank
144,307
Spring Arbor University. Christian University in Spring Arbor, Michigan. We offer undergraduate degrees, adult accelerated degree completion programs and graduate degrees.
Alexa Rank
151,286
Digital Storage Oscilloscopes | Virtual Instruments | Critical test & measurement tools | RIGOL - Innovation or nothing. RIGOL Technologies is transforming the Test and Measurement Industry. Our premium line of products includes Digital and Mixed Signal Oscilloscopes, Spectrum Analyzers, Function/Arbitrary Waveform Generators, Programmable Power Supplies, Digital Multimeters, and Data Acquisition Systems. Our test solutions combine uncompromised product performance, quality, and advanced product features; all delivered at extremely attractive price points. This combination provides our customers with unprecedented value for their investment, reduces their overall cost of test, and helps speed time to completion of their designs or projects.
Alexa Rank
241,840
PhD Thesis Writing Support - Statistical Analysis, Editing | Bangalore. Rehoboth Academic Services is a premium institute supporting PhD & Masters Thesis completion. We offer Editing, Proofreading, Writing, Statistical analysis and Formatting services
Alexa Rank
281,975
Buy cPanel | WHM | Plesk | Litespeed | Cloudlinux - Panellicense.com - panellicense.com. Panellicense.com provides software licenses and services for web hosters for competitive prices. Buy your Litespeed, Cloudlinux, cPanel, Plesk, WHM license with instant activation after completion of your order.
Alexa Rank
283,138
Construction Bid & Project Leads Database | Construct-A-Lead. Construct-A-Lead is an online database that connects users to large-scale commercial construction projects, including those hidden, private project leads. The service features hotel construction, office buildings, retail construction, medical facilities, school renovations and much more, to help bid on construction including those hard-to-find private project leads, from planning stage through completion. Construct-A-Lead’s daily updates of commercial construction project leads are an ideal solution for those who want to put their product or service into commercial, government and religious structures. Let us Construct-A-Lead for you!
Alexa Rank
384,981
GRASP Home. FAFSA Completion, College Financial Aid
Alexa Rank
393,793
Free Online Business Management Training Course | Certificates. Free Online Management Courses with Certificates of Completion. Learn People Management Skills and How to be a Great Manager and Leader.
Alexa Rank
402,427
myTEFL – Online TEFL certification, TEFL jobs & internships. Accredited online TEFL courses with a job placement upon completion. Start now and you could be teaching English abroad within three months. Prices start at $139. For each course enrollment, we make a donation to one of our inspiring partner charities.
Alexa Rank
448,450
PhD&Masters Thesis|Dissertation|Editing|Statistical Analysis|Bangalore. Rehoboth Academic Services is a premium institute supporting PhD & Masters Thesis completion. We offer editing, proofreading, writing, Statistical analysis and Plagiarism checking services
Alexa Rank
488,680
WaniKani Statistics. Track your progress on WaniKani. Estimate your completion date. Track your progress toward JLPT levels.
Alexa Rank
541,791
ADVIDS - Video Content Creation Service. Join 2000+ businesses all over the world who Love ADVIDS. Complete video solution at a fixed budget, from concept till completion We Do It All.
Alexa Rank
544,716
Career Industry Council of Australia (CICA) | The national peak body for the career industry.. Earlier work demonstrates that career and technical education (CTE) can provide long-term financial benefits to participants, yet few have explored potential academic impacts, with none in the era of high-stakes accountability. This paper investigates the causal impact of participating in a specialized high school- based CTE delivery system on high school persistence, completion, earning professional certifications, and standardized test scores, with a focus on individuals from low-income families, a group that is overrepresented in CTE and high school non-completers The Effect of Career and Technicial Education on Human Capital AccumulationDownload
Alexa Rank
561,864
Executive & VIP Aviation International - Aviation Events & Magazine. Executive & VIP Aviation International (EVA) remains the publication of choice for private aircraft owners, operators, brokers, completion houses, and OEMs, along with the industries supporting this vibrant, vital sector of aviation.
Alexa Rank
619,755
Buy Cheap cPanel, Plesk, WHMCS License - Instant Server Licenses. Buy your cPanel, Pesk, WHMCS license with instant activation after completion of your order. Cheap server license reseller with free software installation.
Alexa Rank
622,563
ADVIDS - Video Content Creation Service. Join 2000+ businesses all over the world who Love ADVIDS. Complete video solution at a fixed budget, from concept till completion We Do It All.
Alexa Rank
627,476
Home. Welcome to Balloon Celebrations. Serving New Jersey, Pennsylvania and Delaware. Whether you’re planning a Bar or Bat Mitzvah, wedding,corporate event, christening, grand opening or birthday party. Our creative staff is here to assist you with all your needs. From concept to completion, we are here for you. Balloon Celebrations has been making memorable occassions since 1987. Our team of professional Balloon Decorators will help you create a memorable and affordable day to remember. We deliver Balloon Decorations to N.J. and Pa. 7 days a week. We are located in Blackwood, New Jersey only 15 minutes from Center City Philadelphia. We provide the most creative party decor at reasonable prices.
Alexa Rank
707,724
Hemfikir Ajans. We are an integrated production company: a one stop shop. We bring ideas to life, from concept to completion, across all media channels, for maximum creative and strategic impact. We started in 2015 in Istanbul. A few new people and we have grown into a team of multi-skilled, creatively agile artists– and we continue to find creative, intelligent solutions for our clients. Our creative leads consult with our clients to develop full-service production solutions. Let’s talk about what we can do for your next campaign, from start to finish.
Alexa Rank
714,161
Upright Music. For nearly 20 years Upright Music has been providing music and music supervision for film, advertising, TV and digital. Being the leading independent music provider in Northern Europe we offer inspired and creative supervision, extensive research and efficient clearance services. Our expertise in music helps our clients with every step from concept to completion.
Alexa Rank
780,736
Seleta Training: NVQ Lift & Escalator Engineering Qualifications.. Seleta Training: NVQ Lift Engineering Qualifications. Seleta is a training organisation providing training for the lift and engineering maintenance industries. Individuals gain nationally recognised NVQ qualifications in lift & escalator and maintenance activities through completion of our programmes.
Alexa Rank
1,000,001
Big Valley Homes and Renovations-HomeBig Valley Homes. Be confident your renovation or home construction project is managed to completion on-time and on-budget. A reputation built on 2 generations in Kelowna.
Alexa Rank
1,000,001
Burnt Clay Artists | Home | Brickwork | Patios | Pizza ovens. We are a specialist building company located in Worcester Park, Surrey. We offer a fully integrated service from design right the way through to build and completion of new homes and extensions.
Alexa Rank
1,000,001
Home Renovations & Extensions Melbourne | Sherbrooke Constructions. Award-winning custom home builder based in Melbourne. Specialists in home renovations & extensions since 1990. Guarantees on budget and completion date.
Alexa Rank
1,000,001
Welcome to Parveen Industries Pvt. Ltd.. Parveen Industries Pvt. Ltd. offers a wide range of products from GATE VALVES, CHOKE MANIFOLDS, UNIONS, WIRELINE TOOLS, COMPLETION EQUIPMENT, FLOW LINE EQUIPMENT
Alexa Rank
1,000,001
Progressive Publishing Services | Content Development and Production Services | PPS. PPS is a reliable source for effective content development and production nurturing your projects from concept to completion. To outsource your publishing needs, contact us today.
Alexa Rank
1,000,001
brookspace – Katie Brooks | 13035838 | Web Design Studio. Portfolio Objective The objective of my Portfolio is to guide you through each design stage, through to completion, of the  Client Website Design Project. A range of media for documentation has been used to give you a detailed insight each design stage, including photos and screenshots. The Portfolio is cohesively sectioned into chronological pages, so…
Alexa Rank
1,000,001
Welcome to elc group. ELC Group - Development stage through to the implementation of clinical trials, completion of product registration, and successful marketing of the product, a strategic partner to help pharmaceutical companies achieve their healthcare goals.
Alexa Rank
1,000,001
2 & 3 Days Whole Body Massage Certificate or Diploma Courses - BSMS. Get Liability insurance & WAFCP Approved Professional Membership after completion of 2 & 3 Days Whole Body Massage Certificate or Diploma course from BSMS.
Alexa Rank
1,000,001
Vazoola: Premier Link Building + Influencer Marketing Platform. Powerful platform that connects brands and agencies with vetted and trustworthy influencers for the purposes of: Link Building, Content Marketing, and Social Media Campaigns.
Alexa Rank
68,685
Rochester City School District / Overview
Alexa Rank
74,522
AutoCAD Courses, Tutorials and Tips | SourceCAD. SourceCAD is the place where you get AutoCAD courses, Tips and Tutorials prepared by best instructors of the industry with live support and a lot more.
Alexa Rank
131,499
News, Sports, Jobs - The Intelligencer. News, Sports, Jobs - The Intelligencer
Alexa Rank
160,562
Engineering News-Record | ENR. ENR.com is the bible of the construction industry, providing news and features about projects, products and people in construction, architecture and engineering.
Alexa Rank
199,232
AndyClyde's | Event Planner | Knoxville Tn | United States. AndyClyde's is a premier event planner located in Knoxville, TN. AndyClyde's handles all phases of events. Gives you all you want at a faction of the price
Alexa Rank
202,686
Educational Services Commission of New Jersey / ESCNJ
Alexa Rank
209,132
Freelance Web Designer Minneapolis Minnesota. Web Developer, Graph.... Freelance Web Designer Minneapolis Minnesota. I'm a Web Designer, Web Developer, Graphic Designer, and SEO specialist. Let's get started on your website.
Alexa Rank
243,342
Pacific Homes. Building your trust. Building your dream home.
Alexa Rank
248,202
Clothier Design Sourceclothier design source. Clothing pattern maker and manufacturer of garments. We are an apparel factory and design house.
Alexa Rank
257,278
ACI Worldwide: The Leader In Banking & Payment Solutions. ACI Worldwide delivers electronic banking and payment solutions for more than 5,000 financial institutions, merchants, billers and processors around the world.
Alexa Rank
288,675
Adintop - Powerful, Custom Display Advertising Solutions. Adintop offers the most comprehensive advertising solution on the web by offering access to millions of consumers mainly from the GCC , Middle East and North Africa, and serving more than 500 million monthly Ad impressions
Alexa Rank
295,563
Educational Services Commission of New Jersey / ESCNJ
Alexa Rank
309,125
Home - Swenson He. Never outsourced. We are a software consulting firm that specializes in designing and developing iOS & Android mobile applications.
Alexa Rank
315,574
ZenithJet – HOME. ZenithJet is a business jet services group who specializes in technical assistance for aircraft owners and operators.
Alexa Rank
317,588
Simply Signs, Australia. Experienced professionals bringing branding to life.
Alexa Rank
324,688
ZenithJet – HOME. ZenithJet is a business jet services group who specializes in technical assistance for aircraft owners and operators.
Alexa Rank
342,551
Barr Engineering
Alexa Rank
379,523
Barnstable Patriot: Local News, Politics, Entertainment & Sports in Hyannis, MA. - Barnstable Patriot
Alexa Rank
379,514
BTL Group Ltd.. With offices in Vancouver, Calgary, and London, BTL Group Ltd. develops and invests in blockchain technology.
Alexa Rank
459,169
Take the NMAT by GMAC™ exam to pursue the career of your dreams!. The NMAT™ exam opens doors to the leading management programmes. Brought to you by the organization that owns the GMAT® exam, The NMAT enables schools to recruit top talent with the comfort that the test measures the skills needed to succeed in their programmes. It gives candidates the confidence to perform their best.
Alexa Rank
478,366
Open School: Enterprise School Management Software. Open-School – A versatile school management software used by thousands of educational institutions worldwide for administration & management activities.
Alexa Rank
479,241
Paul M. Jones
Alexa Rank
479,909
New Construction Projects in Dubai, Abu Dhabi, UAE | Ongoing Projects…. Tracking US$8 Trillion+ worth of ongoing projects in the Middle East & Africa
Alexa Rank
521,148
Cypress, TX Landscaping | Magnolia, TX Pool Builder & More. Landscaping and pool builder company in Cypress, TX, Magnolia, TX, The Woodlands, TX and more. Click here to learn more about our custom outdoor solutions
Alexa Rank
536,622
Immigration & Visas Consultant for Study in Australia, India.. Go For Visa is one of the best Visa & Immigration Consultant for Study in Australia, New Zealand and Canada Visas & Australian Immigration Services in India.
Alexa Rank
563,271
Weiterbildungsblog
Alexa Rank
1,000,001
Brochure Design | Large Format Print | Website Development | Signage. Website Design Northampton? Website Development Northampton? Printers Northampton? Whatever You Are Looking For Studio One Can Help. Call NOW 01604 774860.
Alexa Rank
1,000,001
Aerial Photography and Mapping | Cleveland OH | Advanced Perspective. Advanced Perspective specializes in providing commercial aerial photography and video to northern ohio and ajacent areas.
Alexa Rank
1,000,001
Boswell Construction
Alexa Rank
1,000,001
Landscape Design & Architecture | Brooklyn | NYC. Modern landscape design and garden design firm serving New York City and Brooklyn. Specializing in urban gardens, rooftop gardens and green roofs.
Alexa Rank
1,000,001
Code::Blocks. Codeblocks is a cross-platform IDE built around wxWidgets, designed to be extensible and configurable. Runs on Windows and Linux.
Alexa Rank
30,760
Welcome to Valdosta State University. We are a place where all doors are open and you will never feel invisible. Consider the next four years your launching pad. Whatever your goals, Valdosta State can get you there. Your academic trajectory is shaped by innovative learning environments, hands-on research, and small class sizes.
Alexa Rank
156,346
Welcome to the HCC website. HCC has been building large and complex structures for the last 76 years. Known for taking giant strides in technology and innovation, we are now recognized as a spearheading force in engineering construction, both in India and the rest of the world.
Alexa Rank
161,015
HippoEDIT - a Windows text editor for programmers. Text editor for Windows: powerful, fast, and easy to use. Text editor for power users, developers, and programmers. Download a free evaluation copy.
Alexa Rank
165,719
Trendsetter Engineering | Contemporary Subsea Solutions | Houston, Texas - Subsea Product Rentals | Subsea Engineering Solutions. Trendsetter is a premier provider of specialized subsea solutions for oil and gas companies across the globe.
Alexa Rank
222,061
Nine Energy Service | Completions, Oil Well Services, & Frac Plugs. Nine Energy Service offers proven and deep expertise on the industry’s most complex wells, making us suited to help you improve the economics and performance on your next project.
Alexa Rank
406,293
Gökhan Gökalp | C# & Python lover. Distributed tracing, microservice architecture'ı olarak tasarladığımız sistem içerisindeki uygulamalarımızın, nerede performans problemi yaşadığını belirleyebilmemiz ve monitor edebilmemiz için harika bir method. Bir başka değişle, hangi request nereye gidiyor, uçtan uca bir request ne kadar zaman harcıyor gibi sorulara cevap alabilmemiz için implemente etmemiz gereken bir method. Bu makale kapsamında ise, OpenTracing API'ını ve Jaeger tracer'ını kullanarak .NET Core ile geliştirdiğimiz kubernetes üzerindeki microservice'lerin, distributed tracing işlemlerine değineceğiz. Senaryo Bir e-ticaret sistemi üzerinde çalıştığımızı ve uygulamalarımızı kubernetes üzerinde host ettiğimizi düşünelim. Kullanıcılar ile ilgili işlemlerden sorumlu bir User API'ımız var. Yeni bir kullanıcı sisteme kayıt olduğunda ise, "UserRegisteredEvent" adında bir event publish ediliyor. Publish edilen bu event'in subscriber'larından birisi ise, kullanıcıya hesabını aktifleştirebilmesi için e-posta göndermekle sorumlu bir service. Biz ise asenkron olarak gerçekleşen bu kullanıcı kayıt journey'inin, OpenTracing API ve Jaeger tracer'ını implemente ederek, kubernetes üzerinde uçtan uca izleme işlemini gerçekleştireceğiz. OpenTracing ve Jaeger Nedir? Kısaca sizlere OpenTracing ve Jaeger hakkında bilgi vermek istiyorum. OpenTracing, herhangi bir vendor'a bağımlı olmadan uygulamalarımıza distributed tracing için bir instrumentation ekleyebilmemizi sağlayan bir specification'dır. Tıpkı, OpenAPI gibi. Jaeger ise Uber Technologies tarafından geliştirilmiş, OpenTracing standart'larını destekleyen ve microservice mimarimiz üzerinde distributed tracing işlemlerini yapabilmemizi sağlayan harika bir tracer'dır. Jaeger hakkında daha detaylı bilgiye ise, buradan ulaşabilirsiniz. Jaeger'in kubernetes üzerine kurulumu için, şuradaki dokümanları takip edebilirsiniz. Ben bu makale için, development setup'ını uyguladım. [crayon-5cd49f3601f4f043327257/] Jaeger genel hatlarıyla, "Agent", "Collector" ve "Query" den oluşmaktadır. Agent, UDP üzerinden kendisine gelen trace verilerini dinleyip, collector'e ileten bir network daemon'ıdır. Trace verileri ise "Span" olarak adlandırılmaktadır. Collector ise kendisine iletilen trace verilerini, bir pipeline (validations, indexes, transformations) içerisinde işlemektedir. Daha sonra ise seçtiğiniz bir component (Elasticsearch, Cassandra ve Kafka) türüne göre store etmektedir. Query ise isminden de anlaşılabileceği üzere, ilgili trace sonuçlarını sorgulayabileceğimiz bir UI. Peki, Haydi Biraz Kodlayalım! Kodlamaya başlamadan önce platform için sahip olmamız gereken bazı tool'lar: Message Broker (ben RabbitMQ kullanacağım) Docker ve Kuberentes NOT: Ana konumuz platformu oluşturmak olmadığı için, ben kurulum konuları üzerinde durmayacağım. İlk olarak kullanıcıların sisteme kayıt olabilmelerini sağlayacak olan User API'ını develop edelim. Bunun için öncelikle aşağıdaki gibi bir proje oluşturalım. [crayon-5cd49f3601f67738053595/] Ardından "User.Common.Contracts" isminde bir class library oluşturalım. [crayon-5cd49f3601f70725706700/] Bu library içerisinde uygulamalarımız arasında share edeceğimiz contract'ları tanımlayacağız. Şimdi yeni bir kullanıcı sisteme kayıt olduğunda publish edeceğimiz event'i, aşağıdaki gibi oluşturalım. [crayon-5cd49f3601f75302667642/] Oluşturma işleminin ardından, "User.Common.Contracts" library'sini, az önce oluşturmuş olduğumuz "User.API" projesine referans olarak ekleyelim. [crayon-5cd49f3601f7a092216352/] Şimdi "User.API" projesi içerisinde "Models" isminde bir klasör oluşturalım ve ardından içerisine "Requests" ve "Responses" klasörlerini de oluşturalım. "Requests" klasörü içerisine kullanıcının kayıt olurken kullanacağı modeli aşağıdaki gibi tanımlayalım. [crayon-5cd49f3601f7f097304528/] "Responses" klasörü içerisine ise, internal response wrapper class'ını tanımlayalım. [crayon-5cd49f3601f83812110245/] Şimdi ise "Services" isminde bir klasör oluşturalım "User.API" projesi içerisinde. Ardından içerisine aşağıdaki gibi "IUserService" isminde bir interface tanımlayalım. [crayon-5cd49f3601f88467397128/] Kullanıcı ile ilgili business logic'leri, bu service aracılığı ile gerçekleştireceğiz. Bu noktada messaging ile ilgili işlemleri reliable bir şekilde gerçekleştirebilmemiz için projemize NuGet üzerinden bir service bus ekleyeceğiz. Ben MassTransit'in lightweight bir wrapper'ı olan MetroBus library'sini kullanacağım. [crayon-5cd49f3601f8d247751960/] Ardından distributed tracing işlemlerini gerçekleştirebilmemiz için ise OpenTracing ve Jaeger package'larını eklememiz gerekmektedir. [crayon-5cd49f3601f95994346250/] Şimdi bir klasöre daha ihtiyacımız var. Ben structured klasör yapılarını seviyorum. Her neyse, "Services" klasörü altında, "Implementations" adında bir klasör oluşturalım ve içerisinde "IUserService" interface'ini aşağıdaki gibi implemente edelim. [crayon-5cd49f3601f99836393723/] Service içerisinde kısaca neler yaptık bir bakalım. Trace context'inin diğer service'lere otomatik olarak propagate edilmesi Jaeger tarafından zaten otomatik olarak sağlanıyor. Yani api-to-api communication'ı olduğunda ve gerekli configuration'ı yaptığınızda, bir request'i uçtan uca izleyebiliyorsunuz. Biz bu noktada ise api-to-subscriber olarak event-based bir communication gerçekleştirdiğimiz için, trace context'inin propagation işlemini manuel olarak kendimiz sağladık. Trace scope'u içerisine bakarsak, "create-user-async" isminde bir span oluşturduk. Sonrasında ise client olduğuna dair bir tag ekledik. Tag'leri kullanarak span'a additional metadata'lar ekleyebilmek mümkündür. Ardından ise "TextMapInjectAdapter" aracılığı ile ilgili trace context'ini dictionary'e inject ettik. Kullanıcının sisteme kayıt olabilme işlemlerini de tamamlayarak, tracing key'leri ile birlikte "UserRegisteredEvent" ini service bus aracılığı ile queue'ya publish ettik. Bu noktadan sonra ilgili event'i her kim consume ederse, tracing key'lerini kullandığı sürece tüm akışı gözlemleyebileceğiz. Artık controller'ı oluşturabiliriz. Aşağıdaki gibi "UsersController" isminde bir controller oluşturalım. [crayon-5cd49f3601fa3390630898/] Controller içerisinde ise, oluşturduğumuz "IUserService" interface'i üzerinden kullanıcının kayıt işlemlerini gerçekleştiriyoruz. Şimdi "Startup" class'ını açalım ve ilgili service injection işlemlerini aşağıdaki gibi gerçekleştirelim. [crayon-5cd49f3601fad975534208/] Service bus'ı, RabbitMQ kullanarak initialize ettik ve ardından injection işlemini gerçekleştirdik. Daha sonra ise tracer'ı configure ederek inject ettik. Tracer'ı yapılandırırken ben sampling type'ı olarak, "const" sampler'ı kullandım. Diğer seçebileceğiniz sampling seçenekleri ise "Probabilistic", "Rate Limiting" ve "Remote" şeklinde. Daha detaylı sampling bilgilerine ise buradan erişebilirsiniz. Agent host bilgisini de kubernetes ortamınızdaki node IP'si ile değiştirebilirsiniz. Eğer agent kurulumunu sidecar olarak gerçekleştirirseniz de, herhangi bir bilgi set etmenize gerek olmayacaktır. Default bilgilerle erişim sağlayacaktır. API artık hazır durumda. Senaryomuza tekrar dönelim. Kullanıcı sisteme kayıt olduktan sonra bir event publish edecektik. Daha sonra ise kullanıcının hesabını aktifleştirebilmesi için o event'e subscribe olmuş bir aktivasyon e-posta'sı gönderen service oluşturacaktık. Şimdi event'i publish ettik ve artık kullanıcıya aktivasyon e-posta'sını gönderecek olan service'i kodlamaya başlayabiliriz. Subscriber'ın Kodlanması Bunun için yeni bir .NET Core console application'ı oluşturalım. [crayon-5cd49f3601fb6711810293/] Oluşturmanın ardından shared library olan "User.Common.Contracts" projesini referans olarak ekleyelim. Daha sonra ise NuGet üzerinden MetroBus'ı, OpenTracing'i ve Jaeger'i projeye aşağıdaki gibi dahil edelim. [crayon-5cd49f3601fbf686595388/] Console uygulaması, deamon olarak çalışacak bir background service olacak. App startup ve lifetime management'ını yapabilmemiz için ise NuGet üzerinden "Microsoft.Extensions.Hosting" ve "Microsoft.Extensions.DependencyInjection" paketlerini de projeye dahil edelim. [crayon-5cd49f3601fc4559331258/] Ayrıca configuration yönetimini gerçekleştirebilmemiz içinde "Microsoft.Extensions.Configuration" ve "Microsoft.Extensions.Configuration.Json" paketlerini de dahil edelim. [crayon-5cd49f3601fc9431166971/] İlk olarak "Common" adında bir klasör ve içerisine aşağıdaki gibi "TracingExtension" adında bir class ekleyelim. [crayon-5cd49f3601fcd853598730/] API tarafında hatırlarsak, tracing key'lerini event içerisinde publish ederek trace context'inin propagation işlemini manuel olarak gerçekleştirmiştik. Şimdi ise consumer içerisinde span oluşturmak istediğimiz bir noktada, aynı tracing key'lerini context'e extract ederek "TracingExtension" class'ı vasıtasıyla gerçekleştireceğiz. Peki, şimdi ise root dizinde "Consumers" adında yeni bir klasör daha oluşturalım ve içerisine aşağıdaki gibi "UserActivationConsumer" adında bir class ekleyelim. -> User.Activation.Consumer.Common ---> Common ---> Consumers [crayon-5cd49f3601fd4922810120/] Bu noktada, daha önce API içerisinden publish ettiğimiz "UserRegisteredEvent" model'ine subscribe işlemini gerçekleştiriyoruz. Ardından "ITracer" interface'ini inject ediyoruz. "Consume" method'u içerisinde ise, trace context'inin propagation işlemini gerçekleştirebilmemiz için oluşturmuş olduğumuz "TracingExtension" class'ını kullanarak bir scope oluşturuyoruz. Propagate edilmiş trace context'li "user-activation-link-sender-consumer" scope'u sayesinde, artık yaptığımız işlemleri api-to-subscriber olarak trace edebileceğiz. Bu service bir background service'i olarak çalışacağı için, şimdi root dizine dönelim ve "Services/Implementations" klasörlerini oluşturalım. Ardından "Implementations" klasörü altında "BusService" adında bir class oluşturalım ve aşağıdaki gibi implemente edelim. [crayon-5cd49f3601fde430065030/] Implementation sırasında yaptığımız tek şey, bus'ı start ve stop etmek. "Program" class'ını ise aşağıdaki gibi düzenleyelim. [crayon-5cd49f3601fe3048879189/] Sanırım yukarıda yaptıklarımız yeterince açık ve net. Configuration'ı ve dependency injection'ı configure ederek, service'lerimizi inject ediyoruz. Ayrıca trace'i ise, "const" type'ı ile ve "User.Activation.Consumer" adıyla initialize ediyoruz. Consumer'ı ise, "user.activation.queue" adında bir queue ile register ediyoruz. Bu queue ile "UserRegisteredEvent" model'ine subscribe olacaktır. Deployment Artık uygulamaları deploy etmeye hazırız. Ben deployment işlemlerini gerçekleştirebilmek için basit bir Docker file ve Helm chart hazırladım. Bu chart ile, uygulamaları Azure Kubernetes Service üzerine deploy edeceğim. Siz kendi environment'ınıza göre chart'ı değiştirebilirsiniz. Hazırlamış olduğum chart ve docker file'a, buradan erişebilirsiniz. Test Şimdi test aşamasına geçebiliriz. Öncelikle sistemde yeni bir kullanıcı oluşturabilmek için aşağıda olduğu gibi "api/users" endpoint'ine bir POST request'i gönderelim. Bu request ile kullanıcı kayıt journey'ini başlatmış olduk. Senaryomuzda olduğu gibi, kullanıcı kayıt işlemi gerçekleştikten sonra bir event publish edildi. Event'in publish edilmenin ardından event'e subscribe etmiş olduğumuz aktivasyon e-posta'sını gönderecek olan service (user-activation-consumer) ilgili işlemini gerçekleştirmiştir. Peki bu süreçte neler oldu, haydi Jaeger üzerinden bir bakalım. Jaeger üzerindeki akışa bakarsak, bu işlem 4 derinliğe ve 5 adet span'a sahip. Toplam süreç ise 29.54ms sürmüş. Post işleminin kırılımlara bakarsak ise, request ilgili action'dan geçtikten sonra "create-user-async" method'una geliyor ve içerisinde kullanıcı kayıt işlemleri gerçekleştiriliyor. Ardından ise asenkron olarak aktivasyon link'i gönderme işlemleri "User.Activation.Consumer" service'i içerisinde gerçekleştiriliyor. Gördüğümüz gibi bu journey asenkron olarak gerçekleşiyor olmasına rağmen, bu request nerede, süreç nerede ne kadar zaman harcıyor gibi sorulara cevap alabiliyoruz. Sonuç Distributed tracing ile bir developer olarak microservice mimarisi içerisinde koşturan kodumuzu, request'in life cycle'ını, debug edebilir ve optimize edebiliriz. OpenTracing API'ı ile de, vendor lock-in durumuna düşmeden sistemimizin farklı tracer'lar ile esnek bir şekilde trace edilebilmesini sağlayabiliyoruz. Ayrıca ben bu makalede, distributed bir yapıdaki sistem içerisinde trace bilgilerinin propagation işlemlerini de göstermeye çalıştım. Projects: Referanslar
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