معماری Tomcat Series-5.Deep Dive Inther Tomcat's Pipeline-Value

public interface Pipeline {
    public Valve getBasic();

    public void setBasic(Valve valve);

    public void addValve(Valve valve);

    public Valve[] getValves();

    public void invoke(Request request, Response response) throws IOException, ServletException;

    public void removeValve(Valve valve);
}

public interface Valve {
  // Main method for request processing
  public void invoke(Request request, Response response)
    throws IOException, ServletException;

  // Get the next valve in the pipeline
  public Valve getNext();

  // Set the next valve in the pipeline
  public void setNext(Valve valve);
}

public class LoggingValve extends ValveBase {

    private static final Logger log = 
        Logger.getLogger(LoggingValve.class.getName());

    @Override
    public void invoke(Request request, Response response) 
        throws IOException, ServletException {

        // Pre-processing
        long startTime = System.currentTimeMillis();
        log.info("Starting request processing for: " + 
            request.getRequestURI());

        // Pass control to the next valve
        getNext().invoke(request, response);

        // Post-processing
        long endTime = System.currentTimeMillis();
        log.info("Request processing completed in " + 
            (endTime - startTime) + "ms");
    }
}

 path="/myapp" docBase="myapp">
     className="com.example.LoggingValve"/>

public class AuthenticationValve extends ValveBase {
    @Override
    public void invoke(Request request, Response response) 
        throws IOException, ServletException {

        if (isAuthenticated(request)) {
            getNext().invoke(request, response);
        } else {
            response.sendRedirect("/login");
        }
    }
}

public class ErrorHandlingValve extends ValveBase {
    @Override
    public void invoke(Request request, Response response) 
        throws IOException, ServletException {
        try {
            getNext().invoke(request, response);
        } catch (Exception e) {
            log.error("Error processing request", e);
            response.sendError(
                HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        }
    }
}

public class AsyncValve extends ValveBase {
    @Override
    public void invoke(Request request, Response response) 
        throws IOException, ServletException {

        AsyncContext asyncContext = request.startAsync();
        asyncContext.setTimeout(30000);

        asyncContext.start(() -> {
            try {
                // Async processing logic
                getNext().invoke(request, response);
                asyncContext.complete();
            } catch (Exception e) {
                log.error("Async processing error", e);
            }
        });
    }
}