The Collaboration Diagram, also known as a communication diagram, is a type of interaction diagram that shows how objects interact in a particular context. It focuses on the relationship between objects and their collaboration to achieve specific functionality.
# Components
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Objects: Represented by rectangles with the object name and its class.
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Links: Lines that connect objects, showing the relationship and the interaction between them.
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Messages: Small arrows next to the link. They indicate direction, message name, arguments, and a numerical sequence for chronological order.
# Example: Library System
This diagram describes the process for creating a book loan:
Steps of the process:
- The librarian searches for a specific title.
- The system shows the title and available copies.
- The librarian selects the copy.
- The system shows the copy details.
- The librarian identifies the borrower.
- The system confirms the borrower's information.
- The system registers and confirms the creation of the loan.
# Java Implementation
Main interaction class:
public class LoanWindow {
public Title findTitle(String name) {
// Logic to find the title
return new Title(name);
}
public Copy findCopy(Title title) {
// Find an available copy
return new Copy(title);
}
public Borrower identifyBorrower(String name) {
// Identify the member/borrower
return new Borrower(name);
}
public Loan createLoan(Borrower borrower, Copy copy) {
// Register the loan
return new Loan(copy, borrower);
}
}check_circle Advantages
- Clarity in physical connections between objects.
- Direct focus on collaboration.
- Complements the temporal view of the sequence diagram.
cancel Disadvantages
- Less focus on temporal order.
- Becomes chaotic in very large systems.
# Conclusions
The collaboration diagram is useful for visualizing the interactions and collaborations between objects in a process, providing a clear perspective of relationships and dependencies.