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--- tanszek:oktatas:iss_t:evolution_of_software_integration_methods [2023/03/26 18:28] – knehez
+++ tanszek:oktatas:iss_t:evolution_of_software_integration_methods [2025/02/17 10:11] (current) – [Development on a software "Virtual Machine"] knehez
@@ Line 1: / Line 1: @@
-Following figure shows the six classical Software Integration methods.
+==== Six Standard Software Integration Methods ====
-{{tanszek:oktatas:integration_evolution.png|}}
+{{tanszek:oktatas:integration_evolution.png?600x0|}}
@@ Line 35: / Line 35: @@
   * the standard handling of used dependencies (components developed by others) is not uniform, but after 2020, we can use [[https://conan.io/]] or [[https://vcpkg.io/en/]] or the modern [[https://cmake.org/cmake/help/latest/guide/using-dependencies/index.html]].
-  * RELEASE/DEBUG mode compilation method slows down development
+  * RELEASE/DEBUG mode compilation method slows down development (see: https://godbolt.org)
   * it is possible that the operation of the program is different (erroneous, slower) with another compiler
@@ Line 67: / Line 67: @@
   * LLVM: this is not the classic VM, but it compiles the source into an llvm byte code, which then turns into native code. "LLVM is designed around a language-independent intermediate representation that serves as a portable, high-level assembly language that can be optimized with a variety of transformations over multiple passes.
-**Just in Time (JIT) translation**
+**Just in Time (JIT) compilation**
   * The virtual machine can continuously optimize the application code, the byte code conversion is dynamic.
@@ Line 89: / Line 89: @@
 ==== Middleware development method ====
+{{tanszek:oktatas:informatikai_rendszerek_epitese:jee_fejlesztes.png|}}
+Application server development method. It was originally released by Sun Microsystems in 1999 under the name J2EE (Java 2 Enterprise Edition). The standard specification is currently at version 8 (2017): https://javaee.github.io/javaee-spec/
+  * It typically uses middleware implemented in Java. [[https://en.wikipedia.org/wiki/List_of_application_servers]]
+  * famous implementations: Glashfish, Websphere, Weblogic, JBoss, Wildfly
+The entire life cycle of applications is managed by middleware.
+**Web Container** : managing the life cycle of web components.
+**Servlet**: a Java class responsible for standard processing and responses to HTTP requests. Originally responsible for creating dynamic Web content. The generated content is HTML , but more recently JSON. It also includes URL mapping. It was first presented as a concept in 1996!
+  * Automatically generated servlets can also be created using JSP technology, where the HTML code can also contain Java codes.
+  * HTTP requests : GET, POST, PUT, DELETE, OPTIONS
+<code java>
+  public class MyServlet extends HttpServlet{
+	public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
+		{
+		res.setContentType("text/html");
+		PrintWriter pw=res.getWriter();
+		pw.println("<html><body>");
+		pw.println("Hello from servlet");
+		pw.println("</body></html>");
+		pw.close();
+		}
+	}
+</code>
+In the first versions, metadata was managed with XML descriptors. In these, it was possible to specify how a class should behave: URL mapping, number of running instances, etc.
+==== ESB - Enterprise service bus ====
+{{tanszek:oktatas:informatikai_rendszerek_epitese:esb.png|ESB}}
+Service BUS: Service Oriented Architecture (SOA). It is based on loosely coupled components (services). Analogy of the BUS concept known in networks.
+**Main functions**:
+  * Message forwarding - Message Routing between services
+  * Service discovery
+  * Support conversion of different protocols
+  * Validation - schema validation
+  * Version management of services
+  * Monitoring services
+  * Business process management
+**Advantages:**
+  * easily scalable use - from local service to full enterprise access
+  * instead of implementing (coding) the integration, creating configurations
+  * services can be easily started and stopped due to loose connection
+**Disadvantages:**
+  * slow communication
+  * due to centralization, a complete shutdown may occur in the event of an error
+  * high complexity in configuration
+Known implementations:
+Azure Service Bus, Microsoft Biztalk Server, Mule ESB, Oracle ESB, IBM Websphere ESB, JBOSS ESB