Deployment Diagram

It is used to show the physical deployment of artifacts (software components) on hardware nodes.

It visualizes:

• Nodes (hardware or software devices)
• Artifacts (executable files, libraries, components)
• The relationships among them (e.g., communication paths)

Components

Element	Symbol	Description
Node	3D box	A physical entity (e.g., server, computer) that hosts software
Artifact	Rectangle with dog-ear	A physical piece of information (e.g., .jar file, .dll, script)
Communication Path	Solid line	Shows communication between nodes
Dependency	Dashed arrow	Shows dependency between artifacts or nodes

Example:

+------------------------------------------------------+
|                  <<device>>                          |
|               Client Machine                         |
|------------------------------------------------------|
|  +-------------------------------------------------+ |
|  |              <<artifact>>                       | |
|  |              Web Browser                        | |
|  |- Used by students/librarians                    | |
|  |- Accesses the system via HTTP                   | |
|  +------------------------------------------------+| |
+------------------------------------------------------+
                    ||
                    ||  HTTP/HTTPS
                    \/
+------------------------------------------------------+
|                   <<device>>                         |
|                   Web Server                         |
|------------------------------------------------------|
|  +-------------------------------------------------+ |
|  |                <<artifact>>                     | |
|  |              LibraryWebApp.war                  | |
|  |- Handles UI rendering                           | |
|  |- Accepts HTTP requests from clients             | |
|  |- Forwards requests to the application server    | |
|  +-------------------------------------------------+ |
+------------------------------------------------------+
                    ||
                    ||  Internal API Calls (e.g., REST)
                    \/
+------------------------------------------------------+
|                     <<device>>                       |
|                   Application Server                 |
|------------------------------------------------------|
|  +-------------------------------------------------+ |
|  |                  <<artifact>>                   | |
|  |                  LMSLogic.jar                   | |
|  |- Core business logic                            | |
|  |- Processes book issue/return, fines, user auth  | |
|  +-------------------------------------------------+ |
|                                                      |
|  +-------------------------------------------------+ |
|  |                 <<artifact>>                    | |
|  |                    ORM.jar                      | |
|  |- Handles database access (ORM Layer)            | |
|  +-------------------------------------------------+ |
+------------------------------------------------------+
                    ||
                    ||  JDBC/SQL
                    \/
+------------------------------------------------------+
|                    <<device>>                        |
|                  Database Server                     |
|------------------------------------------------------|
|  +-------------------------------------------------+ |
|  |              <<artifact>>                       | |
|  |            LibraryDB (MySQL)                    | |
|  |- Stores books, users, transactions, fines       | |
|  |- Central persistent data storage                | |
|  +-------------------------------------------------+ |
+------------------------------------------------------+
                    /\
                    ||
                    ||  HTTPS / API / Background Sync
+------------------------------------------------------+
|                     <<device>>                       |
|                 Mobile App Device                    |
|------------------------------------------------------|
|  +-------------------------------------------------+ |
|  |               <<artifact>>                      | |
|  |              LibraryApp.apk                     | |
|  |- Mobile client for accessing LMS features       | |
|  |- May work in online/offline mode                | |
|  +-------------------------------------------------+ |
+------------------------------------------------------+