ADD file via upload

DatabaseConnection.java

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+
+
+/**
+ * Simulates an expensive object: database connection (time-consuming creation, high resource usage)
+ * Implements Prototype interface to support cloning
+ * @author chuyang
+ * @version 1.0
+ */
+public class DatabaseConnection implements Prototype<DatabaseConnection> {
+
+	/**
+	 * Connection unique identifier
+	 */
+	private String connectionId;
+	/**
+	 * Database URL
+	 */
+	private String databaseUrl;
+	/**
+	 * Whether the connection is currently in use (pool management status)
+	 */
+	private boolean isInUse;
+	public ConnectionPoolManager m_ConnectionPoolManager;
+
+	public DatabaseConnection(){
+		this.connectionId = "";
+		this.databaseUrl = "";
+		this.isInUse = false;
+	}
+
+	@Override
+	public void finalize() throws Throwable {
+		// Cleanup when connection is closed
+		System.out.println("Connection " + connectionId + " is being finalized");
+	}
+	/**
+	 * Constructor: Simulates high-cost creation scenarios (network connections, authentication, etc.)
+	 * 
+	 * @param connectionId Connection ID
+	 * @param databaseUrl Database URL
+	 */
+	public DatabaseConnection(String connectionId, String databaseUrl){
+		// Simulate time-consuming connection creation
+		try {
+			Thread.sleep(100); // Simulate connection creation delay
+		} catch (InterruptedException e) {
+			Thread.currentThread().interrupt();
+		}
+		this.connectionId = connectionId;
+		this.databaseUrl = databaseUrl;
+		this.isInUse = false;
+		System.out.println("Connection " + connectionId + " created to " + databaseUrl);
+	}
+
+	/**
+	 * Reset connection state: Called when returning to pool, clears temporary data and marks as idle
+	 */
+	public void reset(){
+		// Clear temporary data
+		this.isInUse = false;
+		System.out.println("Connection " + connectionId + " has been reset");
+	}
+
+	/**
+	 * Clone method: Used to quickly copy objects (more efficient than new)
+	 * @return Cloned object
+	 */
+	@Override
+	public DatabaseConnection clone(){
+		try {
+			// Create new connection object and copy properties
+			DatabaseConnection cloned = (DatabaseConnection) super.clone();
+			cloned.connectionId = this.connectionId + "_clone";
+			cloned.databaseUrl = this.databaseUrl;
+			cloned.isInUse = false;
+			System.out.println("Connection " + connectionId + " cloned as " + cloned.connectionId);
+			return cloned;
+		} catch (CloneNotSupportedException e) {
+			throw new RuntimeException("Clone failed", e);
+		}
+	}
+	
+	// Getter and Setter methods
+	public String getConnectionId() {
+		return connectionId;
+	}
+	
+	public void setConnectionId(String connectionId) {
+		this.connectionId = connectionId;
+	}
+	
+	public String getDatabaseUrl() {
+		return databaseUrl;
+	}
+	
+	public void setDatabaseUrl(String databaseUrl) {
+		this.databaseUrl = databaseUrl;
+	}
+	
+	public boolean isInUse() {
+		return isInUse;
+	}
+	
+	public void setInUse(boolean inUse) {
+		isInUse = inUse;
+	}
+}