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Spring MVC uses a front controller called the DispatcherServlet to receive all incoming requests and delegate them to controllers for processing. The DispatcherServlet acts as a single entry point for requests and uses handler mappings and handler adapters to route requests to annotated @Controller classes and @RequestMapping methods. It then works with ViewResolvers to select the appropriate view to render the response before returning it to the client.
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We implement context-sensitive pointer/alias and dataflow analyses on Graspan. An evaluation of these analyses on large codebases such as Linux shows that their Graspan implementations scale to millions of lines of code and are much simpler than their original implementations.
These analyses were used to augment the existing checkers; these augmented checkers found 132 new NULL pointer bugs and 1308 unnecessary NULL tests in Linux 4.4.0-rc5, PostgreSQL 8.3.9, and Apache httpd 2.2.18.
- Accepted in ASPLOS ‘17, Xi’an, China.
- Featured in the tutorial, Systemized Program Analyses: A Big Data Perspective on Static Analysis Scalability, ASPLOS ‘17.
- Invited for presentation at SoCal PLS ‘16.
- Invited for poster presentation at PLDI SRC ‘16.
Measures in SQL (SIGMOD 2024, Santiago, Chile)
SQL has attained widespread adoption, but Business Intelligence tools still use their own higher level languages based upon a multidimensional paradigm. Composable calculations are what is missing from SQL, and we propose a new kind of column, called a measure, that attaches a calculation to a table. Like regular tables, tables with measures are composable and closed when used in queries.
SQL-with-measures has the power, conciseness and reusability of multidimensional languages but retains SQL semantics. Measure invocations can be expanded in place to simple, clear SQL.
To define the evaluation semantics for measures, we introduce context-sensitive expressions (a way to evaluate multidimensional expressions that is consistent with existing SQL semantics), a concept called evaluation context, and several operations for setting and modifying the evaluation context.
A talk at SIGMOD, June 9–15, 2024, Santiago, Chile
Authors: Julian Hyde (Google) and John Fremlin (Google)
https://doi.org/10.1145/3626246.3653374
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Dispatcher
- 1. Spring MVC
- 2. 1.Acts as Front Controller Similar to other Java web framework, Spring MVC also uses a front controller to receive all incoming request and delegates to other components for further processing. Ex: Spring MVC controllers which are annotated using @Controller annotation and ViewResolvers Ex: InternalResourceViewResolver class. 2.The DispatcherServlet is a front controller e.g. it provides a single entry point for a client request to Spring MVC web application and forwards request to Spring MVC controllers for processing.
- 6. Its URL pattern is usually “ * " so that all incoming request should go through Dispatcher servlet as shown below:
- 7. It acts as a front controller and provides a single entry point for the application. It then uses handler mappings and handler adapters to map a request to the Spring MVC controllers. It uses @Controller and @RequestMapping annotation for that purpose.
- 8. In short, DispatcherServlet is used following things in Spring MVC - receives all request as Front Controller and provides a single entry point to the application - mapping requests to correct Spring MVC controller - Consulting ViewResolvers to find correct View - forwarding request to chosen View for rendering - returning the response to the client - creates web-context to initialize the web specific beans e.g. controllers, view resolvers and handler mapping
- 9. That's all about what is the use of DispatcherServlet in Spring framework. It's is one of the key components of Spring MVC which is used to receive all incoming request and forward them to right controllers for actual processing. It finds the right controllers by using handler mappings e.g. SimpleUrlHandlerMapping or BeanNameUrlHandlerMapping, which check if the bean name is same as view name and the bean implements the View interface. If you are using annotations then it can also use @Controller and @RequestMapping annotations to find the right controller to process a particular request. Once the request is processed by controller it returns a logical view name to DispatcherServlet. The DispatcherServlet then consults ViewResolver and LocalResolvers to find the right View to render the output. Once the correct View is chosen, it forwards the request to the View for rendering the response.
- 10. Rahul Vutukuri Rahul.Vutukuri@cerner.com