![]() ![]() Lasso Server provides easy to use, yet powerful control over content type and character encoding. This system is designed to make it easy to separate logic from presentation. Lasso Server provides an object model for programmatically building response documents in addition to a simple template mode for creating or customizing HTML, XML, PDF or any other sort of data on the fly. A full compliment of methods and objects are included for accessing web server parameters and variables as well as for encoding and decoding data and for responding to requests. Lasso Server operates with any FastCGI supporting web server, such as Apache, IIS, lighttpd and WebSTAR. Lasso Server is a suite of tools and methodologies for developing, serving and administering data-driven web sites written in the Lasso language. This helps keep unused data out of memory, improves startup time, and lets an application be built and deployed in a modular manner. The result of this compilation is a dynamic library which can be loaded automatically on-demand the first time the type or method is required. Object types and methods can be compiled ahead of time using the Lasso compiler (lassoc). This is helpful not only during development, but also while a system is in-service and urgent, well tested patches need to be applied. ![]() New types and methods can be added at runtime, which means that a running system is not required to be brought down for most changes. Types can be extended through a "traits" system, promoting code reuse, and methods are open to multiple-dispatch, which uses type annotations to provide pattern matching over method calls. Lasso's type system combines the dynamic nature of scripting languages, with some of the safety and features normally only available in statically typed languages. It improves upon this by already including many of the most useful 3rd party libraries, data sources, technologies and protocols. The language integrates closely to the Lasso runtime to give access to the lower level operating system in a uniform and performance minded manner. Lasso is a dynamically typed object-oriented language with close ties to its database abstraction layer. This version of the Lasso language builds upon many years of success with providing a versatile and full featured programming language. Each thread maintains its own set of variables and a thread can not directly access the variables of another thread. Internally, such an application consists of a set of sub-processes, or threads, each waiting to receive messages and sleeping until such messages arrive. Though the Lasso runtime can operate in the role of a quick command line utility, it is designed with features to support the needs of a "stay running" application process. It also supports a flexible array of options for ahead of time code compilation into dynamically loaded libraries as well as stand-alone executables for Mac OS X and Linux platforms. The Lasso runtime system manages the dynamic compilation of Lasso language code down to native machine code with integrated caching schemes and automatic optimization of the most frequently used methods and object types. Lasso's threading model is integrated with its transparent event driven IO sub-system to make efficient use of hardware with multiple CPUs and to ensure that network requests are served promptly under heavy load. It was engineered with a focus on scalability and performance. The Lasso runtime is a language platform designed from the ground up with the single purpose of hosting on-line applications. The details of programming in the Lasso language are covered in the Lasso 9 Language Guide also included with this product. Lasso Server manages processing and executing these files and responding to the client with the resulting data. Lasso can be easily embedded in templates with HTML, XML or other data types. ![]() Generally, these local resources are files written in the Lasso language. Lasso Server works by receiving requests from the web server and routing those requests to specific server-side resources. This functionality empowers you to build and serve just about any dynamic web application that you need with maximum productivity and ease. It adds a suite of dynamic functionality and database connectivity to your web site. Lasso Server (and Lasso Developer) is server-side software that runs along with any FastCGI capable web server. This chapter introduces important concepts and information you should know before starting to use Lasso Server or Lasso Developer. Welcome to Lasso Server, a powerful and comprehensive tool for building and hosting data-driven web applications. ![]()
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