RPCX: Distributed Pluggable RPC Service Framework Like Alibaba Dubbo

Announce

A tcpdump-like tool added: rpcxdump。 You can use it to debug communications between rpcx services and clients.

Cross-Languages

you can use other programming languages besides Go to access rpcx services.

rpcx-gateway: You can write clients in any programming languages to call rpcx services via rpcx-gateway
http invoke: you can use the same http requests to access rpcx gateway
Java Services/Clients: You can use rpcx-java to implement/access rpcx servies via raw protocol.

If you can write Go methods, you can also write rpc services. It is so easy to write rpc applications with rpcx.

Installation

install the basic features:

go get -v github.com/smallnest/rpcx/...

If you want to use quic、kcp registry, use those tags to go get 、 go build or go run. For example, if you want to use all features, you can:

go get -v -tags "quic kcp" github.com/smallnest/rpcx/...

tags:

quic: support quic transport
kcp: support kcp transport
ping: support network quality load balancing
utp: support utp transport

Which companies are using rpcx?

Features

rpcx is a RPC framework like Alibaba Dubbo and Weibo Motan.

rpcx is created for targets:

Simple: easy to learn, easy to develop, easy to intergate and easy to deploy
Performance: high perforamnce (>= grpc-go)
Cross-platform: support raw slice of bytes, JSON, Protobuf and MessagePack. Theoretically it can be used with java, php, python, c/c++, node.js, c# and other platforms
Service discovery and service governance: support zookeeper, etcd and consul.

It contains below features

Support raw Go functions. There's no need to define proto files.
Pluggable. Features can be extended such as service discovery, tracing.
Support TCP, HTTP, QUIC and KCP
Support multiple codecs such as JSON, Protobuf, MessagePack and raw bytes.
Service discovery. Support peer2peer, configured peers, zookeeper, etcd, consul and mDNS.
Fault tolerance：Failover, Failfast, Failtry.
Load banlancing：support Random, RoundRobin, Consistent hashing, Weighted, network quality and Geography.
Support Compression.
Support passing metadata.
Support Authorization.
Support heartbeat and one-way request.
Other features: metrics, log, timeout, alias, circuit breaker.
Support bidirectional communication.
Support access via HTTP so you can write clients in any programming languages.
Support API gateway.
Support backup request, forking and broadcast.

rpcx uses a binary protocol and platform-independent, which means you can develop services in other languages such as Java, python, nodejs, and you can use other prorgramming languages to invoke services developed in Go.

There is a UI manager: rpcx-ui.

Performance

Test results show rpcx has better performance than other rpc framework except standard rpc lib.

The benchmark code is at rpcx-benchmark.

Listen to others, but test by yourself.

Test Environment

CPU: Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz, 32 cores
Memory: 32G
Go: 1.9.0
OS: CentOS 7 / 3.10.0-229.el7.x86_64

Use

protobuf
the client and the server on the same server
581 bytes payload
500/2000/5000 concurrent clients
mock processing time: 0ms, 10ms and 30ms

Test Result

mock 0ms process time

mock 10ms process time

mock 30ms process time

Examples

You can find all examples at rpcxio/rpcx-examples.

The below is a simple example.

Server

    // define example.Arith
    ……

    s := server.NewServer()
    s.RegisterName("Arith", new(example.Arith), "")
    s.Serve("tcp", addr)

Client

    // prepare requests
    ……

    d, err := client.NewPeer2PeerDiscovery("tcp@"+addr, "")
    xclient := client.NewXClient("Arith", client.Failtry, client.RandomSelect, d, client.DefaultOption)
    defer xclient.Close()
    err = xclient.Call(context.Background(), "Mul", args, reply, nil)

Contribute

see contributors.

Welcome to contribute:

submit issues or requirements
send PRs
write projects to use rpcx
write tutorials or articles to introduce rpcx

stable branch: v1.7.x
development branch: master
Official site: http://rpcx.io

Notice: etcd

etcd plugin has been moved to rpcx-etcd

Author: Smallnest
Source Code: https://github.com/smallnest/rpcx
License: View license

#go #golang

What is GEEK

Buddha Community

RPCX: Distributed Pluggable RPC Service Framework Like Alibaba Dubbo

Carmen Grimes

1595491178

Best Electric Bikes and Scooters for Rental Business or Campus Facility

The electric scooter revolution has caught on super-fast taking many cities across the globe by storm. eScooters, a renovated version of old-school scooters now turned into electric vehicles are an environmentally friendly solution to current on-demand commute problems. They work on engines, like cars, enabling short traveling distances without hassle. The result is that these groundbreaking electric machines can now provide faster transport for less — cheaper than Uber and faster than Metro.

Since they are durable, fast, easy to operate and maintain, and are more convenient to park compared to four-wheelers, the eScooters trend has and continues to spike interest as a promising growth area. Several companies and universities are increasingly setting up shop to provide eScooter services realizing a would-be profitable business model and a ready customer base that is university students or residents in need of faster and cheap travel going about their business in school, town, and other surrounding areas.

Electric Scooters Trends and Statistics

In many countries including the U.S., Canada, Mexico, U.K., Germany, France, China, Japan, India, Brazil and Mexico and more, a growing number of eScooter users both locals and tourists can now be seen effortlessly passing lines of drivers stuck in the endless and unmoving traffic.

A recent report by McKinsey revealed that the E-Scooter industry will be worth― $200 billion to $300 billion in the United States, $100 billion to $150 billion in Europe, and $30 billion to $50 billion in China in 2030. The e-Scooter revenue model will also spike and is projected to rise by more than 20% amounting to approximately $5 billion.

And, with a necessity to move people away from high carbon prints, traffic and congestion issues brought about by car-centric transport systems in cities, more and more city planners are developing more bike/scooter lanes and adopting zero-emission plans. This is the force behind the booming electric scooter market and the numbers will only go higher and higher.

Companies that have taken advantage of the growing eScooter trend develop an appthat allows them to provide efficient eScooter services. Such an app enables them to be able to locate bike pick-up and drop points through fully integrated google maps.

List of Best Electric Bikes for Rental Business or Campus Facility 2020:

It’s clear that e scooters will increasingly become more common and the e-scooter business model will continue to grab the attention of manufacturers, investors, entrepreneurs. All this should go ahead with a quest to know what are some of the best electric bikes in the market especially for anyone who would want to get started in the electric bikes/scooters rental business.

We have done a comprehensive list of the best electric bikes! Each bike has been reviewed in depth and includes a full list of specs and a photo.

Billy eBike

mobile-best-electric-bikes-scooters https://www.kickstarter.com/projects/enkicycles/billy-were-redefining-joyrides

To start us off is the Billy eBike, a powerful go-anywhere urban electric bike that’s specially designed to offer an exciting ride like no other whether you want to ride to the grocery store, cafe, work or school. The Billy eBike comes in 4 color options – Billy Blue, Polished aluminium, Artic white, and Stealth black.

Price: $2490

Available countries

Available in the USA, Europe, Asia, South Africa and Australia.This item ships from the USA. Buyers are therefore responsible for any taxes and/or customs duties incurred once it arrives in your country.

Features

Control – Ride with confidence with our ultra-wide BMX bars and a hyper-responsive twist throttle.
Stealth- Ride like a ninja with our Gates carbon drive that’s as smooth as butter and maintenance-free.
Drive – Ride further with our high torque fat bike motor, giving a better climbing performance.
Accelerate – Ride quicker with our 20-inch lightweight cutout rims for improved acceleration.
Customize – Ride your own way with 5 levels of power control. Each level determines power and speed.
Flickable – Ride harder with our BMX /MotoX inspired geometry and lightweight aluminum package

Specifications

Maximum speed: 20 mph (32 km/h)
Range per charge: 41 miles (66 km)
Maximum Power: 500W
Motor type: Fat Bike Motor: Bafang RM G060.500.DC
Load capacity: 300lbs (136kg)
Battery type: 13.6Ah Samsung lithium-ion,
Battery capacity: On/off-bike charging available
Weight: w/o batt. 48.5lbs (22kg), w/ batt. 54lbs (24.5kg)
Front Suspension: Fully adjustable air shock, preload/compression damping /lockout
Rear Suspension: spring, preload adjustment
Built-in GPS

Why Should You Buy This?

Riding fun and excitement
Better climbing ability and faster acceleration.
Ride with confidence
Billy folds for convenient storage and transportation.
Shorty levers connect to disc brakes ensuring you stop on a dime
belt drives are maintenance-free and clean (no oil or lubrication needed)

**Who Should Ride Billy? **

Both new and experienced riders

**Where to Buy? **Local distributors or ships from the USA.

Genze 200 series e-Bike

genze-best-electric-bikes-scooters https://www.genze.com/fleet/

Featuring a sleek and lightweight aluminum frame design, the 200-Series ebike takes your riding experience to greater heights. Available in both black and white this ebike comes with a connected app, which allows you to plan activities, map distances and routes while also allowing connections with fellow riders.

Price: $2099.00

Available countries

The Genze 200 series e-Bike is available at GenZe retail locations across the U.S or online via GenZe.com website. Customers from outside the US can ship the product while incurring the relevant charges.

Features

2 Frame Options
2 Sizes
Integrated/Removable Battery
Throttle and Pedal Assist Ride Modes
Integrated LCD Display
Connected App
24 month warranty
GPS navigation
Bluetooth connectivity

Specifications

Maximum speed: 20 mph with throttle
Range per charge: 15-18 miles w/ throttle and 30-50 miles w/ pedal assist
Charging time: 3.5 hours
Motor type: Brushless Rear Hub Motor
Gears: Microshift Thumb Shifter
Battery type: Removable Samsung 36V, 9.6AH Li-Ion battery pack
Battery capacity: 36V and 350 Wh
Weight: 46 pounds
Derailleur: 8-speed Shimano
Brakes: Dual classic
Wheels: 26 x 20 inches
Frame: 16, and 18 inches
Operating Mode: Analog mode 5 levels of Pedal Assist Throttle Mode

Norco from eBikestore

norco-best-electric-bikes-scooters https://ebikestore.com/shop/norco-vlt-s2/

The Norco VLT S2 is a front suspension e-Bike with solid components alongside the reliable Bosch Performance Line Power systems that offer precise pedal assistance during any riding situation.

Price: $2,699.00

Available countries

This item is available via the various Norco bikes international distributors.

Features

VLT aluminum frame- for stiffness and wheel security.
Bosch e-bike system – for their reliability and performance.
E-bike components – for added durability.
Hydraulic disc brakes – offer riders more stopping power for safety and control at higher speeds.
Practical design features – to add convenience and versatility.

Specifications

Maximum speed: KMC X9 9spd
Motor type: Bosch Active Line
Gears: Shimano Altus RD-M2000, SGS, 9 Speed
Battery type: Power Pack 400
Battery capacity: 396Wh
Suspension: SR Suntour suspension fork
Frame: Norco VLT, Aluminum, 12x142mm TA Dropouts

Bodo EV

bodo-best-electric-bikes-scooters http://www.bodoevs.com/bodoev/products_show.asp?product_id=13

Manufactured by Bodo Vehicle Group Limited, the Bodo EV is specially designed for strong power and extraordinary long service to facilitate super amazing rides. The Bodo Vehicle Company is a striking top in electric vehicles brand field in China and across the globe. Their Bodo EV will no doubt provide your riders with high-level riding satisfaction owing to its high-quality design, strength, breaking stability and speed.

Price: $799

Available countries

This item ships from China with buyers bearing the shipping costs and other variables prior to delivery.

Features

Reliable
Environment friendly
Comfortable riding
Fashionable
Economical
Durable – long service life
Braking stability
LED lighting technology

Specifications

Maximum speed: 45km/h
Range per charge: 50km per person
Charging time: 8 hours
Maximum Power: 3000W
Motor type: Brushless DC Motor
Load capacity: 100kg
Battery type: Lead-acid battery
Battery capacity: 60V 20AH
Weight: w/o battery 47kg

#android app #autorent #entrepreneurship #ios app #minimum viable product (mvp) #mobile app development #news #app like bird #app like bounce #app like lime #autorent #best electric bikes 2020 #best electric bikes for rental business #best electric kick scooters 2020 #best electric kickscooters for rental business #best electric scooters 2020 #best electric scooters for rental business #bird scooter business model #bird scooter rental #bird scooter rental cost #bird scooter rental price #clone app like bird #clone app like bounce #clone app like lime #electric rental scooters #electric scooter company #electric scooter rental business #how do you start a moped #how to start a moped #how to start a scooter rental business #how to start an electric company #how to start electric scooterrental business #lime scooter business model #scooter franchise #scooter rental business #scooter rental business for sale #scooter rental business insurance #scooters franchise cost #white label app like bird #white label app like bounce #white label app like lime

Carmen Grimes

1595494844

How to start an electric scooter facility/fleet in a university campus/IT park

Are you leading an organization that has a large campus, e.g., a large university? You are probably thinking of introducing an electric scooter/bicycle fleet on the campus, and why wouldn’t you?

Introducing micro-mobility in your campus with the help of such a fleet would help the people on the campus significantly. People would save money since they don’t need to use a car for a short distance. Your campus will see a drastic reduction in congestion, moreover, its carbon footprint will reduce.

Micro-mobility is relatively new though and you would need help. You would need to select an appropriate fleet of vehicles. The people on your campus would need to find electric scooters or electric bikes for commuting, and you need to provide a solution for this.

To be more specific, you need a short-term electric bike rental app. With such an app, you will be able to easily offer micro-mobility to the people on the campus. We at Devathon have built Autorent exactly for this.

What does Autorent do and how can it help you? How does it enable you to introduce micro-mobility on your campus? We explain these in this article, however, we will touch upon a few basics first.

Micro-mobility: What it is

micro-mobility

You are probably thinking about micro-mobility relatively recently, aren’t you? A few relevant insights about it could help you to better appreciate its importance.

Micro-mobility is a new trend in transportation, and it uses vehicles that are considerably smaller than cars. Electric scooters (e-scooters) and electric bikes (e-bikes) are the most popular forms of micro-mobility, however, there are also e-unicycles and e-skateboards.

You might have already seen e-scooters, which are kick scooters that come with a motor. Thanks to its motor, an e-scooter can achieve a speed of up to 20 km/h. On the other hand, e-bikes are popular in China and Japan, and they come with a motor, and you can reach a speed of 40 km/h.

You obviously can’t use these vehicles for very long commutes, however, what if you need to travel a short distance? Even if you have a reasonable public transport facility in the city, it might not cover the route you need to take. Take the example of a large university campus. Such a campus is often at a considerable distance from the central business district of the city where it’s located. While public transport facilities may serve the central business district, they wouldn’t serve this large campus. Currently, many people drive their cars even for short distances.

As you know, that brings its own set of challenges. Vehicular traffic adds significantly to pollution, moreover, finding a parking spot can be hard in crowded urban districts.

Well, you can reduce your carbon footprint if you use an electric car. However, electric cars are still new, and many countries are still building the necessary infrastructure for them. Your large campus might not have the necessary infrastructure for them either. Presently, electric cars don’t represent a viable option in most geographies.

As a result, you need to buy and maintain a car even if your commute is short. In addition to dealing with parking problems, you need to spend significantly on your car.

All of these factors have combined to make people sit up and think seriously about cars. Many people are now seriously considering whether a car is really the best option even if they have to commute only a short distance.

This is where micro-mobility enters the picture. When you commute a short distance regularly, e-scooters or e-bikes are viable options. You limit your carbon footprints and you cut costs!

Businesses have seen this shift in thinking, and e-scooter companies like Lime and Bird have entered this field in a big way. They let you rent e-scooters by the minute. On the other hand, start-ups like Jump and Lyft have entered the e-bike market.

Think of your campus now! The people there might need to travel short distances within the campus, and e-scooters can really help them.

How micro-mobility can benefit you

benefits-micromobility

What advantages can you get from micro-mobility? Let’s take a deeper look into this question.

Micro-mobility can offer several advantages to the people on your campus, e.g.:

Affordability: Shared e-scooters are cheaper than other mass transportation options. Remember that the people on your campus will use them on a shared basis, and they will pay for their short commutes only. Well, depending on your operating model, you might even let them use shared e-scooters or e-bikes for free!
Convenience: Users don’t need to worry about finding parking spots for shared e-scooters since these are small. They can easily travel from point A to point B on your campus with the help of these e-scooters.
Environmentally sustainable: Shared e-scooters reduce the carbon footprint, moreover, they decongest the roads. Statistics from the pilot programs in cities like Portland and Denver showimpressive gains around this key aspect.
Safety: This one’s obvious, isn’t it? When people on your campus use small e-scooters or e-bikes instead of cars, the problem of overspeeding will disappear. you will see fewer accidents.

#android app #autorent #ios app #mobile app development #app like bird #app like bounce #app like lime #autorent #bird scooter business model #bird scooter rental #bird scooter rental cost #bird scooter rental price #clone app like bird #clone app like bounce #clone app like lime #electric rental scooters #electric scooter company #electric scooter rental business #how do you start a moped #how to start a moped #how to start a scooter rental business #how to start an electric company #how to start electric scooterrental business #lime scooter business model #scooter franchise #scooter rental business #scooter rental business for sale #scooter rental business insurance #scooters franchise cost #white label app like bird #white label app like bounce #white label app like lime

dia adalyn

1612246777

Open your own B2B e-commerce app like Alibaba tailored with rich features

Are you a dedicated entrepreneur who is looking to start a B2B website like Alibaba? Then you are in the right place to buy Appdupe’s Alibaba clone script enriched with customizable and B2B marketplace features. Our Alibaba clone app development is well-crafted and neatly designed with an intuitive interface that keeps your app intact with your users for a longer duration. We built a high-quality Alibaba clone software enabling every app user to connect on the social marketplace. Hence, wait no longer to build an app like Alibaba using our user-friendly clone app services.

#alibaba clone #alibaba clone app #alibaba clone script #alibaba clone app development #alibaba clone software #alibaba clone open source

dia adalyn

1609830499

Run your ecommerce business online with Alibaba clone script with salient features

Are you an entrepreneur who is looking to start a multi-vendor business like Alibaba? Then you are at the right place to build your Alibaba clone app with reliable ecommerce marketplace features.

You are sure you want to start an ecommerce business but are you confused about where to begin? Either to start with B2B ecommerce, B2C, or C2C? Don’t get bewildered. We are here to help you out.

We have seen giant ecommerce sites like Amazon, eBay, but what if we tell you to start your business serving all three audience segments? There comes the unique ecommerce online platform, Alibaba.

It is referred to as China’s Amazon and is one of the world’s biggest ecommerce in the world today. The current revenue growth of Alibaba is 144% over 2017-2019 and is predicted to increase by 78% in 2021, which is nearly $100 billion.

Here in this article, we will discuss the success factor of this big ecommerce website and give useful information on how to start a multi-vendor ecommerce website with Appdupe’s Alibaba clone.

Why is Alibaba super successful?

We know many ecommerce apps like Amazon, eBay, but what is so special about
Alibaba? Also, earlier, Alibaba was just a usual website created by Jack Ma. But the reason it stands top and unique in the ecommerce business domain is that it provides small businesses with a reliable platform to grow.

Their unique and secret successful strategies are listed below.

Unique and effective monetization strategy
They provide sellers and users to register on their platform for free of cost. You may get this question then how do they earn? Through ads, marketing, and intuitive apps, and the quality of services in the app.

It provides

Secured payment gateway
Gives users/buyers with options to rate and review a product purchased
Effective keyword search engine
Products are available at a reasonable cost.

Do you want to start a B2b/B2C/C2C ecommerce business? Are you confused about what business segment to select, then Alibaba’s business model will help you decide and give clear clarity?

Its business model is entirely different and unique from other ecommerce websites like the well-known Amazon and eBay. They remain successful because instead of selling products directly, they act as a middleman giving platform/providing opportunities for wholesalers with a platform to sell their products.

Business models

Wholesaling
In Alibaba, they give flexibility for retailers to purchase bulk products from wholesalers through their online marketplace. Ensure to include this in your B2B clone script, where you can also consider selling bulk products.

Dropshipping
Alibaba acts as an intermediary that helps connect sellers to buyers. Similarly, you can free yourself of all the inventory activities like shaking hands with a dropshipping and other partners using this business model.

If you want to earn money with this business model, pay the wholesale amount to the drop shipper, and keep the rest from selling.

Through Ads
Here in this business model, you won’t charge your sellers a transaction fee. Instead, you earn from displaying ads on your multi-vendor platform.

Showcasing intuitive ads on the prime spot can make an impression. Ensure to provide your sellers with an option to rank first or on the top in the search results using an internal search engine.

One of the success factors for any business is the list of features in the app. As we all know, Alibaba serves B2B, B2C, and C2C. Do you think features would vary if your target audience is different? Not at all! The reason is that even B2B users expect a B2C experience while shopping online.

Hence, ensure all these Alibaba clone features in your B2B clone script like login, add to cart, checkout, and more.

#alibaba clone open source #app like alibaba #alibaba app clone #alibaba clone features #alibaba like app development

Jasper Prohaska

1648440900