BIG LIST OF WEBSITES

List of Top Websites on Injection

Top 250 Websites on INJECTION

Download the Top 250 Websites to PDF

Last updated on Jun 1 2020.
Here are the best websites we found: metalinjection.net • epsilonindustries.com • bauer-kompressoren.de • kaysun.com • 3dhubs.com • ozempic.com • thunder-max.com • moldchina.com • totalplasticssolutions.com.au

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Heavy Metal News, Music Videos, Tour Dates - Metal Injection. The leading metal news, metal music video and metal tour date source on the internet. Get your fix of Metal Injection!
Alexa Rank
28,055
Injection Molded Parts Made in USA - Injection Molder. Plastic Injection Molding
Alexa Rank
389,482
BAUER COMPRESSORS: breathing air, industry, FGS, fuel gas systems, GIT, gas injection technology. BAUER KOMPRESSOREN is devoted to the manufacture of high pressure compressors and components, such as filter systems and regeneration dryers. The product range also includes custom-built units for special applications. Applications: Scuba Diving, Industry, industrial air and gas, Fire Services, Natural Gas, Paintball, Shooting, CNG Filling Stations, Gas Injection Technology, GIT, GID, Government sales.
Alexa Rank
256,398
Injection Molding Company & Engineering Solutions Experts. Kaysun Corporation is the leader among plastic injection molding companies and is your partner for custom molding, scientific molding & engineering solutions.
Alexa Rank
398,825
Visit our Instagram page. From prototypes to end parts. Get your parts into production in less than 5 minutes. Services: 3D Printing ● CNC Machining ● Injection Molding
Alexa Rank
52,625
Ozempic® Once Weekly Non-Insulin | Ozempic® (semaglutide) injection 0.5 mg or 1 mg. Ozempic® (semaglutide injection) is a once-weekly non-insulin medicine that, along with diet and exercise, may help improve blood sugar in adults with type 2 diabetes. Read Important Safety Information on this page.
Alexa Rank
168,848
ThunderMax : Home - Electronic Fuel Injection (EFI) and Performance Parts for Harley Davidson and VTwin Motorcycles. Electronic Fuel Injection (EFI) and Performance Parts for Harley Davidson and VTwin Motorcycles
Alexa Rank
208,127
Plastic Injection Mold Maker, China Injection Molding Manufacturer. Sositar Mould company, with over 20 years experience in mold making and injection molding, our factory based in Shenzhen China, specialize in custom plastic injection mold making & injection molding, our price is much lower than other mold tooling maker, feel free to contact us!
Alexa Rank
476,539
Plastic Injection Moulding Brisbane - Total Plastics Solutions. Plastic Injection Moulding Brisbane - Total Plastics Solutions has expertise in design, engineering and manufacture of plastics products. Contact us today!
Alexa Rank
489,341
Plastic Injection molded parts/components | automotive parts | Primex. Primex plastics Pvt.Ltd. is an ISO/TS 16949:2009 certified company of automotive parts/car parts & plastic Injection molded parts/components manufacturers.
Alexa Rank
481,180
Stack Injection | EFI Manifold | Individual Throttle Bodies. Stack Injection supplies individual throttle body manifolds for Ford, GMH and Chev V8 engines. These EFI systems, manufactured by DC & O in Sydney For more detail visit our website.
Alexa Rank
486,214
Fred''s TDI Page. TDIClub.com. VW TDI Enthusiast Community. Fred''s TDI Page and Forums. Also called TDICLUB.com, a great place to make other Dieselheads interested in the VW Group''s TDI (Turbo Direct Injection) Diesel including Audi. Forums, news and more...
Alexa Rank
63,209
Plastic Injection Molding in Fort Worth | Superior Plastics. With over 34 years of experience in custom plastic Injection molding, our manufacturing process brings designs to life with precision, speed and efficiency.
Alexa Rank
234,105
Scientific Plastic Injection Molding and Assembly in Texas, All-Plastics. Scientific injection molding can reduce your manufacturing costs and improve your quality through innovative manufacturing techniques. Contact us today!
Alexa Rank
242,139
QT Manufacturing | Injection Mold Making | Plastic Injection Molding | CNC Machining | 972-221-0537. QT manufacturing is a domestic contract manufacturer in the Dallas & Fort Worth area focused in: injection mold making, plastic injection molding, and precision CNC machining. Learn more by calling 972-221-0537
Alexa Rank
259,660
Healthcare Provider Information | AJOVY™ (fremanezumab-vfrm) injection. Efficacy, dosing, and patient support for AJOVY™ (fremanezumab-vfrm) injection
Alexa Rank
376,720
Polymer-Based Graphics for Injection Molded Plastics. Polyfuze Graphics are polymer-based graphics for injection molded plastics that are an alternative to IML, hot stamp foils, heat transfers or pad printing.
Alexa Rank
409,700
Rex Plastics | Plastic Injection Molding | Vancouver, WA. At Rex Plastics, we're proud to offer plastic injection molding services done by a local team of experienced and dedicated operators. Call today to learn more!
Alexa Rank
412,177
M K Healthcare - Third Party Manufacturing In Baddi Himachal Pradesh Chandigarh and Leading pharmaceutical company for PCD of Tablets, Capsule, Injection, Soft Gel, Syrups, Powder, Food Supplements.. M K Healthcare lead in Third Party Manufacturing In Baddi Himachal Pradesh Chandigarh and Leading pharmaceutical company for PCD, pharma franchise of Tablets, Capsule, Injection, Soft Gel, Syrups, Powder, Ointment, Food Supplements, Anti-Biotic
Alexa Rank
476,354
PFI Inc | Injection Mold Plating, Anodizing Services, Low Friction Coating. PFI Inc specializes in manufacturing plating solutions for the injection mold industry. Our proprietary mold coatings offer lubricity and durability.
Alexa Rank
480,228
ASIATIC Plastic Packaging Industries - injection moulding products and various products for packaging such as food packaging, food trays, bowl, jars, container, cup, lids, boxes. ASIATIC Plastic Packaging Industries - injection moulding products and various products for packaging such as food packaging, food trays, bowl, jars, container, cup, lids, boxes
Alexa Rank
510,445
Plastic Injection Molding | Idler Pulley Manufacturers | Composite Idler Pulleys | Thermoplastic Part Designers | Sprocket Supplier | Custom OEM Component Molders | Precision Mold Tooling and EDM Machining | Retlaw Industries Inc. Hartland, Wisconsin. For over 40 years, Retlaw Industries has been producing quality injection molding tools which has led us heavily into injection molding and composite plastic part manufacturing.
Alexa Rank
537,365
ISCAR Cutting Tools - Metal Working Tools - Precision Carbide Metal Working Tools - Metal Cutting Applications. ISCAR is a dynamic full line supplier of precision carbide metal working tools, producing a wide range of carbide inserts, carbide end mills and cutting tools covering most metal cutting applications
Alexa Rank
53,691
Patient Information for SUBLOCADE™ (buprenorphine extended-release) injection, for subcutaneous use (CIII). See full safety and prescribing information, including BOXED WARNING and Med Guide for SUBLOCADE™ (buprenorphine extended-release). Find SUBLOCADE information including safety, how it works, side effects, savings, FAQs and resources.
Alexa Rank
210,836
Long Acting Insulin | Toujeo® (insulin glargine injection) 300 Units/mL. Learn about Toujeo a long-acting insulin for adults with diabetes that may help with blood sugar control.
Alexa Rank
279,053
Custom Contract Plastics Manufacturing | Injection Molding & B/F/S. Plastikon is a custom contract plastics manufacturing company. Award winning innovation in plastics for the electronics, medical and automotive industries.
Alexa Rank
310,675
Plastic Design Manufacturer - Plastic Injection Molding Company | B&R Plastics Inc.. For over 45 years, B & R Plastics has provided top quality plastic products for customers across the country. Whether you operate in retail, hospitality, kitchen, dessert, hospital or any industry, B & R Plastics is your one-stop source for quality, domestically produced molded plastic parts. Contact us today.
Alexa Rank
381,759
CB Performance Products, Inc. sells CNC ported cylinder heads, dune buggy parts, drop spindles, disc brake kits, turbos, electronic fuel injection efi systems, crankshafts, connecting rods and turnkey engine kits for aircooled volkswagens
Alexa Rank
382,984
Kemflo Canada | Your Partner for Injection Molding Products. Kemflo Canada provides their customers with cost effective product solutions achieving the highest level of quality possible meeting or surpassing customer’s expectations and industry standards.
Alexa Rank
443,505
Reprogrammation moteur et injecteurs essence: Puissance Injection Lyon. Reprogrammation moteur sur banc de puissance 2RM 4RM et Moto à Lyon, Meilleur spécialiste français de l'injecteur essence pour youngtimers et compétition.
Alexa Rank
444,893
Adreco Plastics | UK Plastic Injection Moulding | Plastic Moulding Company. For over 40 years, Adreco Plastics have provided tooling and moulding services to a vast range of industries including Medical, Defence, Retail, Automotive, Construction & More
Alexa Rank
536,451
Veterinary Drug, Veterinary Pharmaceutical Agent, Veterinary Pharmaceutical Factory, GMP Factory - Bullvet, Searching the agent in the world. Bullvet is a wholesaler of veterinary drug from China,we can manufacture nearly 100 varieties of small volume injection, large volume injection and oral liquid.. All products have been exported to over 20 countries worldwide.
Alexa Rank
183,541
Oliver Gierke
Alexa Rank
104,970
Fuel-Injection-Autopartes-Tomco-de-Mexico. Tomco, especialistas en sistema Fuel Injection: Válvula IAC, Sensores, Cuerpos de Aceleración, Inyectores, entre otros. Más de 55 años como Líderes de Autopartes en México
Alexa Rank
140,370
Mesotherapy For Sale - Buy Mesotherapy Lipostabil Online. Buy Lipostabil injection for do it yourself mesotherapy to lose weight. Lipostabil products online help to burn fat, targeting cellulite reduction and body contouring with mesotherapy treatment training and Lipostabil. mesotherapy,mesotherapy injection, mesotherapy products, mesotherapy supplies, mesotherapy cocktails, mesotherapy needle, mesotherapy no needle, lipodissolve, lipostabil injection, cardispan injection, aesthetic dermal mesotherapy, mesotherapy do it yourself, lipodissolve kits, derma rollers
Alexa Rank
243,591
Meridian Products Corporation - Meridian Products Corp. Meridian Products Corporation is a full service Custom Injection Molder. We provide complete contract manufacturing services by assisting in your product development, rapid prototypes, on-site mold construction, high to low volume part production, custom packaging and fulfillment.
Alexa Rank
258,951
Manufacturing Cost Estimation. CustomPartNet is a free resource for engineers and manufacturers that facilitates product design and cost estimation. Learn about the process cycle and design for manufacturing (DFM) guidelines for a wide range of manufacturing processes, including injection molding, metal casting, machining (milling and turning), and rapid prototyping. Get fast and accurate cost estimates by using our interactive cost estimators, widgets, and calculators.
Alexa Rank
315,647
Security Testing - SecApps. Identify web security vulnerabilities such as XSS, SQL Injection, Local file include and many others with SecApps vulnerability scanner and pen testing tools.
Alexa Rank
342,108
Polymer Exchange: makes Buying and Selling of Polymers Simple. Polymer Exchange makes buying and selling of polymers simple. It allows user to buy or sell plastics raw materials by putting their requirements on the application.
Alexa Rank
126,512
GRAutoGas - LPG Systems | Autogas Conversion Products | Online Shop for LPG Systems. GR Autogas provides cost-effective, high-quality gas injection solutions for your automobile. You can also buy products related to the LPG Systems industry, by leading brands: Lovato, BRC, Tomasetto, Stag, Step, MSM Gas. GR Autogas Buy heating electrode caldron system by Galan!
Alexa Rank
512,316
Otelina : Instituts de beauté et massages à Nyon et Genève. Otelina vous présente son institut de beauté de Nyon et son institut de beauté de Genève. Au programme : Massages, soins du visage et soins du corps, épilations, maquillage permanent, médecine esthétique, programme minceur, problèmes de peau et onglerie.
Alexa Rank
135,729
Sidi Kerir Petrochemicals Company (SIDPEC). Sidi Kerir Petrochemicals Company (SIDPEC)
Alexa Rank
142,477
TrishTech.com. During GOG Summer Sale Festival, they are giving away classic fun game "ToonStruck" absolutely free. Have fun while trying to escape cartoon world in this game.
Alexa Rank
372,919
Products. Mr Turbo Performance parts for winners!
Alexa Rank
147,351
Medical and Research Supplies - Medlab Gear. Medical and research supplies from Medlab Gear for diabetic supply needs, syringes and needles, vial boxes, injection liquids, & more. Same day shipping.
Alexa Rank
276,376
Weighing, Feeding, Screening, Pneumatic & Mechanical Conveying, Air Filtration - Schenck Process. Schenck Process is your complete global source of highly accurate bulk materials handling solutions including pneumatic conveying and injection, mechanical conveying, weighing and feeding, vibrating screens and feeders, and dust filtration
Alexa Rank
281,788
Ηλεκτρικά Ανταλλακτικά Αυτοκινήτων - Autospark.gr. Ηλεκτρικά Ανταλλακτικά Αυτοκινήτων. Μίζες, δυναμό, ανταλλακτικά Injection, διακόπτες, λάμπες αυτοκινήτων, φανάρια, προϊόντα Hella, λάμπες αυτοκινήτων Osram.
Alexa Rank
285,680
Plastic Model Kits: model airplane kits, Revell, Monogram, Aurora. Plastic model kits for sale. Models by Revell, Aurora, Monogram, Hasegawa, Tamiya, Hawk and more. Rare and vintage airplane models, R/C, ship models and car models. Over 6000 different kits in stock. All-plastic model kits got their start in 1936 when FROG in England produced the first in a series of kits known as ''Frog-Penguins.'' Frog had previously made flying models, so this was a reference to the ''birds'' that will not fly. The line was successful and expanded, but WWII ended production. After the war, Frog resumed production and soon had competition from Airfix and others. In America, Frog''s progress had been noted. In 1946 two US companies released all-plastic models -- Varney''s tenite/plastic U.S. Fleet Submarine and Stearman PT-17 trainer and Hawk''s Curtiss R3C-1 in black acetate plastic. The kits met with a very cold reception at hobby shops that were not sure what to do with them. Predictably, existing modeling experts were very negative on the kits because of the lack of carving and ''…real skill'' needed to make the model. Gordon Varney was discouraged enough gave up on plastic model kits and sell the molds in about 1947 to O-Lin. Meanwhile Hawk, already firmly entrenched in the model business with their line of wooden kits, approached toy stores with the plastic line and had more luck. O-Lin''s first kit was the P-80B Shooting Star in 1947. O-Lin, of which little is known, was at least partially owned by Paul Lindberg, who was known for his stick-and-tissue flying aircraft designs. In 1948 Hawk was encouraged enough to expand the 1/48 scale line to four racing aircraft. For 1949 Hawk began using polystyrene plastic and added the Lockheed Constellation and F-84. In 1948/49 O-lin added the Piper Cub, Republic Seabee and six small racers. Sales continued to improve but slowly. At this time they modified the old Varney molds for the PT-17 and Fleet Sub and modified the wood-and-plastic PT Boat and LST to make them all plastic kits. But by 1951 the Mates brothers (owners of Hawk) could see that plastic kits were the future and discontinued all wooden models. This was a very early decision, but Hawk had always been on the cutting edge. But so far, proper marketing had escaped Hawk and O-Lin. But the solution was just around the corner. In 1951, Gowland & Gowland were displaying 1/32 scale model cars that were to become the ''Highway Miniatures'' series. Sol & Lou Kramer (formerly of Burd Models) and Lew Glaser (of Precision Specialties, soon to be Revell) were impressed and thought they could be a hit with the proper marketing approach. Going directly to department and variety stores, the line was picked up by Woolworths and the rest is history. People of all ages found them fun and easy to build – and the mold presses ran 24 hours a day to keep up with demand. New cars were introduced as fast as possible and national ad campaigns were run. The modern Hobby Industry had been born. It did not take long for Glaser to see the future and Revell soon concentrated solely on plastic model kits, producing the famous ''Pre-S'' and ''S'' kit lines with world-renowned box artwork. Manufactures such as Strombecker and Monogram jumped on the band wagon and Aurora Plastics, which had made toys, switched to models. According to surveys at the time by Boy''s Life magazine, model building was the #1 hobby of young boys. Male adults were bitten by the bug also! The late 1950s was the ''Age Of Boxart'' for model kits. In this time, the finest commercial artist were commissioned to produce box art for model kits. Revell S kits (so known for their box-side advertisements to use Revell S Glue) and Aurora are among the best brands for superb box artwork. During this time, manufacturers expanded kit lines rapidly and models appeared everywhere - not just in hobby shops, but in grocery stores, toy stores, 5 & 10s, camera shops, pharmacies and much more The 1960s were no less optimistic. Revell produced some excellent box art with the ''Famous Artist Series'' and Aurora was using Jo Kotula (well known for his covers on Model Airplane News magazine) and John Steel among others. Kit lines expanded rapidly for aircraft, ship, car and military models. Buyers were equally enthusiastic. Monogram, never known for it''s box art, continued to turn our some of the finest quality models - many of which are still in production to this day. Some of the standouts are the 1/32 Phantom Mustang P-51, Phantom Huey UH-1, B-52 Stratofortress with Jet Sound and the super detailed line of 1/8 cars such as the Big T Big Deuce, Big Tub, Big Drag, Jaguar XKE and 1965 Corvette. Monogram''s line of 1/24 cars had unprecedented quality and detail. In the late 1960s Revell popularized 1/32 scale by releasing a very nice series of WWII aircraft. Never had such a line been available in such a large scale, the reactions were very positive. Revell''s 1/72 line of aircraft was rapidly expanded with great improvements over the earlier S kits. Revell continued to use the ''series'' approach to releases through much of the 1960s. But there were storm clouds on the horizon. Aurora began suffering reduced sales. Their product line was dated, and the detail generally low. Aurora was always first to market at an affordable price. This was a good practice when plastic modeling was new, but builders were demanding more detail and better scale fidelity. Aurora''s new molds were much improved but there were too few of them. In the early 1970s sales remained positive but not for long. Other interests were competing with models. Companies that could not provide enough quality product, such as Aurora, suffered greatly and could not stay in business. Through the 1980s and 1990s many established manufactures in America and Europe closed up shop or took part in a large number of mergers and ownership changes. Manufacturers were hesitant to cut large numbers of molds due to the expenses. But some excellent kits were released and older kits improved. During these years, short run technology came into it''s own. Between vacuum forming, resin casting and small injection molding machines, avid modelers and small businesses took up the slack from the big manufactures and flourished. Suddenly, kits were available that we never dreamed of back in the day. This created much new interest for the hobby. In the 2000s, things have turned around in a very positive sense. CAD and mold cutting technology has improved and modeling interest is significant. There have been so many new manufactures and kits released that it is difficult to keep track! Once again the future of modeling looks excellent.
Alexa Rank
293,458
Home - e-auto.com.mx - El Sitio de los Mecánicos y Refaccionarios. e-auto.com.mx; el sitio de los mecánicos y autopartistas
Alexa Rank
161,261
Home - DieselCore. We Engineer Profit.. We buy your used diesel injectors, turbos, injection pumps, ecm modules, and more! Sell us your core!
Alexa Rank
304,203
Diesel Equipment Company Heavy Duty Truck Replacement Parts Greensboro NC | Truck Trailer Parts. Diesel Equipment Company located in Greensboro North Carolina. A warehouse distributor of diesel parts, fuel injection systems and heavy duty electrical products.
Alexa Rank
304,204
Home : Reln. Reln is a quality-endorsed Australian company, with worldwide manufacturing and plastic injection moulding capabilities. Reln is renowned designing, market
Alexa Rank
311,323
Taurus Engineering. Taurus specializes in supplying ESP related feedthrus and connectors and services to the Oil and Gas Industry; including Explosion-Proof Connectors, Wellhead Feedthru Mandrels and Surface Connectors, Packer Penetrators, Chemical Injection Tubing, Instrumentation Wire and other Specialty Products.
Alexa Rank
313,204
Ηλεκτρικά Ανταλλακτικά Αυτοκινήτων - Autoelectrics.gr. Ηλεκτρικά Ανταλλακτικά Αυτοκινήτων. Μίζες, δυναμό, ανταλλακτικά Injection, διακόπτες, λάμπες αυτοκινήτων, φανάρια, προϊόντα Hella, λάμπες αυτοκινήτων Osram.
Alexa Rank
318,310
Facial, Face Lift, Botox, Filter, Tattoo Removal, Face Brightening, Skin & Face Tightening, Wrinkle, Fat Reduction | Kitchener Waterloo Cosmetic Clinic & Medi Spa. Sunshine Kitchener Waterloo Cosmetic Clinic and Medi Spa offers facial, sunspot , rejuvenation, face lift, face brightening, skin tightening, face tightening, Botox/filters injection, tattoo removal, pigmentation, acne scar, Hyaluronic acid, wrinkle and fat reduction in Kitchener Waterloo area. We are specialized in cosmetic rejuvenation and other skin care treatments.
Alexa Rank
329,552
Hentai Futanari Porn | HentaiFutanari.com
Alexa Rank
243,167
PHP: The Right Way. An easy-to-read, quick reference for PHP best practices, accepted coding standards, and links to authoritative PHP tutorials around the Web
Alexa Rank
246,968
Oil and Gas | Petroleum | Energy | News | Projects. Oil and gas energy pipelines Onshore Offshore new projects wells petroleum Refinery ministry new LPG LNG Natural gas rigs products exploration Projects
Alexa Rank
249,082
. g0tmi1k''s personal blog about information security with how to guides, scripts and videos.
Alexa Rank
257,929
Plastics Technology. Plastics Technology covers technical and business Information for Plastics Processors in Injection Molding, Extrusion, Blow Molding, Plastic Additives, Compounding, Plastic Materials, and Resin Pricing
Alexa Rank
444,889
Web Vulnerability Scanner / Web Security Testing Tools. Websecurify free and premium security tools automatically scan websites for vulnerabilities like SQL Injection, Cross-site Scripting and others
Alexa Rank
446,495
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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