asp net core 2.1 barcode generator

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Although the single instance multiple thread model is the default, a servlet can change this behavior by implementing SingleThreadModel This interface, which has no methods, informs the servlet engine that it should create a pool of instances and allocate each incoming request to its own instance and thread This guarantees no two requests handled by the same instance will overlap in their execution of the service method Thus, instance variables can only be affected by one request at a time, making them thread safe Note, because multiple instances may exist, however, there s nothing to prevent them from executing concurrently in different threads If they access external resources like files or database connections, therefore, they can still come into conflict There are few situations in which SingleThreadModel solves a problem that couldn t be handled better by other means

Although navigating through a Web page may seem like a conversation between client and server, in most cases, it isn t Typically, a Web client requests an HTML document, which is located by the server and transmitted back to the client If image links are in the HTML, the client (if it s a Web browser) will make additional requests to the server for each image If the user clicks a hyperlink in the page, the client issues a new HTTP request for it, but all this happens one request at a time Between each request, the server moves on to handle other requests, forgetting all about the first client No back-and-forth exchange of commands and data occurs, only a request followed by a response and a disconnect5 For basic downloading of static documents, this is adequate However, applications like shopping carts or iterative search engines need to maintain active objects on the server that are associated with particular clients It may take several requests to build these objects In this case, a need exists to keep track of to which client the objects are bound Several approaches can be used to solve this problem Most of them involve maintaining the object itself on the server, assigning it a unique key the client is asked to remember In each subsequent related request, the client passes back the key, which enables the server to reestablish the context This is similar to booking an airline ticket over the telephone The ticket agent asks the customer for her name, address, and flight information, entering all this into a data entry application that assigns a confirmation number, which is reported back

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5 HTTP 11 does provide a means for connections to persist for a few seconds, so that, for example, HTML and associated images can be downloaded efficiently This requires both the client and server to know about the capability and request it explicitly The request/response protocol itself, however, is the same

With sufficient forethought and design for testability, debugging can be as systematic as application development

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nstalling and configuring Web applications has historically been a completely vendor-specific task Apache JServ, for example, used both properties files and files containing Apache directive extensions to configure its servlet zones and their attributes Early versions of JRun came with a raft of properties files used to indicate how many servers existed, what ports they used, their classpaths, what servlets aliases they recognized, which servlets should be preloaded, and so on The JSWDK reference implementation used a custom XML format for this purpose A certain amount of diversity is inevitable because servlet engines are, after all, different implementations with their own particular features But that part of the configuration task is limited The part that describes and interacts with servlets themselves is fairly regular and can be standardized with great benefit This is precisely what happened in connection with the introduction of Web applications in the Servlet 22 API This chapter describes the structure of a Web application and how to move it out of the development environment and into a production environment

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