Real-time supply-demand matching

List of the table of contents of this article:

• 1, What is HCE cloud payment?
• 2、 How to deal with the distributed transaction problems of microservice architecture?
• 3, What are the system architectures commonly used in e-commerce websites
• 4, Which four supports of e-commerce
• 5, Distributed architecture design from 0 to 1 all collections, strongly recommended to collect
• 6, What is the Taobao trading system used How many line programs are designed in language and architecture

What is HCE cloud payment?

HCE cloud payment credit card is equivalent to a subsidiary card of a credit card. Credit card holders can conveniently apply for HCE cloud payment credit card service as long as they use an Android mobile phone with NFC function, log in to ICBC mobile banking and click the "Cloud Payment" icon.

According to the relevant person in charge of ICBC, HCE cloud payment credit card is a new financial service based on mobile Internet life.

Cloud flash payment card (hereinafter referred to as "cloud card") is an innovative payment method jointly based on HCE and TOKEN technology by Pudong Development Bank and UnionPay. At the same time, it has the ability of online payment and offline "flash payment", and cardholders can enjoy convenient, safe and fast bank card services.

How to deal with the distributed transaction problems of microservice architecture?

1. Both parties to the solution start the MSDTC service MSDTC service to provide distributed transaction services. If you want to use distributed transactions in the database, you must serve the participating parties.The server starts the MSDTC (Distributed Transaction Coordinator) service.

2. The current mainstream distributed solution framework: 1. Single project multi-data source, can be jta+Atomikos 2, based on the form of RabbitMQ, the idea of final consistency. 3. Solve distributed transactions based on RocketMQ and adopt transaction messages.

3. It mainly appears in the Try stage. Query before confirm or cancel by adding a transaction status table. To be more rigorous, we need to add distributed locks. Due to timeout and other reasons, cancel is executed before try, which is a suspension problem.

What is the system architecture commonly used in e-commerce websites

1. The basic structure of the e-commerce system includes the network Network, user, authentication center, payment center, logistics center. Network: The network is the foundation of e-commerce and the carrier of business and business information transmission. Its basic forms include the Internet, intranet, external/networking and value-added network.

2. Vertical store: Vertical store, which serves certain groups of people or certain specific needs, provides comprehensive and more professional services related to the needs of this field.

3. Electronic: refers to information infrastructure and related application systems, of which information infrastructure includes the Internet network foundation and information technology, and the application system should include websites that support e-commerce activities. Business: refers to business content, processes and rules, which are the basis and basis for the system design of e-commerce websites.

4. Cloud architecture: Cloud computing services (such as AWS, Azure, Alibaba Cloud) are usually used to host the system to improve availability, security and flexibility. Database hierarchical architecture: use multi-level database architecture, such as main database, backup database and cache database, to ensure the security and recoverability of data.

5. Network layer (network platform) Network layer is the hardware infrastructure of e-commerce and an information transmission system, including telecom, cable TV, wireless and the Internet (inter Net).

6. This article will describe and record the e-commerce business model, what is the e-commerce background, and what is the e-commerce background system architecture. The e-commerce industry consists of a series of suppliers, service providers, distributors and consumers.

Which four supports of e-commerce

1, [Answer]: B, C, D, E The test points of this question are the general framework of e-commerce.Among them, the four pillars include public policy, technical standards, network security and legal norms, so B, C, D and E are correct.

2. Among them, the four pillars include public policy, technical standards, network security and legal norms. Option B Electronic payment belongs to the content of the general business service layer in three levels.

3. Network infrastructure, electronic payment system. Network infrastructure: E-commerce requires infrastructure that depends on the Internet, including network bandwidth, servers, routers, switches and other network equipment. Electronic payment system: E-commerce needs to rely on electronic payment systems, including bank card payment, third-party payment, etc.

4. The fourth pillar, the practical application layer of e-commerce. The specific application scope of e-commerce is relatively wide, includingSupply chain management, e-market and e-advertising, online shopping, online entertainment, paid information services and online banking. The two support points of e-commerce are the basis for the existence and application of the framework structure.

5. The e-commerce standard system includes public standards, network standards, application platform standards and application technology standards. China's e-commerce technology application standards include four aspects: EDI standards, commodity coding standards (HS), communication network standards and other related standards. ( 3) Network security. Security is the core issue in e-commerce.

Distributed architecture design from 0 to 1 all collection, strongly recommended to collect

1. Distributed frameConstruction refers to achieving a higher level of computing power by assigning different tasks in the application to multiple computers and servers. The purpose of the distributed architecture is to improve the scalability, reliability and availability of applications.

2. A distributed system is a software system built on the network. Process the assistance task, and then integrate the results. In a distributed system, a group of independent computers present a unified whole to the user, just like a system.

3. Design the application service to be stateless, so that the program can save all the data that needs to be saved in a special storage (eg. Database), so that the application service program can be restarted at will without losing data, which is convenient for the distributed system to restore the application service after the server goes down.

4. Enterprises that want to disclose applications to end users outside the company, such as customers, partners and suppliers, usually choose web-based distributed architectures in this way. Of course, enterprise data itself may be further distributed to multiple databases to create a more different architecture.

What language and architecture is used to design the Taobao trading system, and how many lines are there

Before saying this answer, let me introduce this entrepreneurial team. Members: three development engineers (xu Zhu, Sanfeng, Dolong), one UED (second manager), three operators (Xiaobao, Ake, Potian), one manager (God of Wealth), and Jack Ma and his secretary.

In the early days, it was done with PHP's framework PHPAuction. Because PHP did not support accessing the Oracle database by connecting the pool, it was later rewritten in Java with the help of SUN engineers.

v1 is version1, which is the first version of Taobao's system. When it was founded in 2003, Taobao was just an instant messaging tool, and gradually developed into a shopping platform. The v1 system is the core system in the early stage of Taobao, including user management, commodity management and other aspects.

Or C store? It can be said that each type of store has its own advantages and can succeed, mainly depending on which type of your product is more suitable for.

Module 4: Use js to do traditional java,.Database operation and server programming that can only be done by NET and PHP.

Visual breathing: The graphic and text combination plate appropriately increases the space and adjusts it to the most comfortable and balanced visual structure. There is a sense of visual breathing, so that users can be in an efficient and relatively comfortable state when shopping and browsing. For example, like my Taobao revision, the designer's visual breathing normal tool card series design is very much in line with the design concept.