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Amazon S3 (Simple Storage Service) is a web service offered by Amazon Web Services. Amazon S3 provides storage through web services interfaces (REST, SOAP, and BitTorrent). Amazon does not make details of S3's design public, though it clearly manages data with an object storage architecture. According to Amazon, S3's design aims to provide scalability, high availability, and low latency at commodity costs.
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JUnit is a unit testing framework to write repeatable tests. JUnit has been important in the development of test-driven development, and is one of a family of unit testing frameworks which is collectively known as xUnit that originated with SUnit. A research survey performed in 2013 across 10,000 Java projects hosted on GitHub found that JUnit, (in a tie with slf4j-api), was the most commonly included external library.
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JMeter is an application that offers several possibilities to configure and execute load, performance and stress tests using different technologies and protocols. It allows simulating different type of requests against all kind of databases, FTP, HTTP, HTTPS or other kind of servers. Originally JMeter was designed to test web applications, but its functionality has expanded and nowadays allows testing against almost any kind of program and can be used to perform functional tests in your applications..
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A design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. A design pattern is not a finished design that can be transformed directly into source or machine code. It is a description or template for how to solve a problem that can be used in many different situations. Patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system.
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