Statische Member

class DatabaseManager {
    private static instance: DatabaseManager | null = null;
    private static activeConnections: number = 0;
    private static readonly MAX_CONNECTIONS: number = 5;
    private static connectionLog: string[] = [];
    
    private connectionId: string;
    private isConnected: boolean = false;
    
    private constructor(id: string) {
        this.connectionId = id;
    }
    
    static getInstance(): DatabaseManager {
        if (!DatabaseManager.instance) {
            DatabaseManager.instance = new DatabaseManager("main-connection");
            DatabaseManager.logEvent("Database manager initialized");
        }
        return DatabaseManager.instance;
    }
    
    static createConnection(id: string): DatabaseManager | null {
        if (DatabaseManager.activeConnections >= DatabaseManager.MAX_CONNECTIONS) {
            DatabaseManager.logEvent(`Connection limit reached. Cannot create connection: ${id}`);
            return null;
        }
        
        const connection = new DatabaseManager(id);
        DatabaseManager.activeConnections++;
        DatabaseManager.logEvent(`New connection created: ${id}`);
        return connection;
    }
    
    static getActiveConnectionCount(): number {
        return DatabaseManager.activeConnections;
    }
    
    static logEvent(message: string): void {
        const timestamp = new Date().toISOString();
        DatabaseManager.connectionLog.push(`[${timestamp}] ${message}`);
    }
    
    static getConnectionLog(): string[] {
        return [...DatabaseManager.connectionLog];
    }
    
    static clearLog(): void {
        DatabaseManager.connectionLog = [];
    }
    
    connect(): boolean {
        if (!this.isConnected) {
            this.isConnected = true;
            DatabaseManager.logEvent(`Connection ${this.connectionId} established`);
            return true;
        }
        return false;
    }
    
    disconnect(): boolean {
        if (this.isConnected) {
            this.isConnected = false;
            DatabaseManager.activeConnections--;
            DatabaseManager.logEvent(`Connection ${this.connectionId} closed`);
            return true;
        }
        return false;
    }