How to use before method of filter Package

...455	}456}457458// Expectation: the second variadic arg should cause the execution of the filter459// to preserve the parameters from before its execution.460func TestParamResetFilter(t *testing.T) {461	testName := "TestParamResetFilter"462	route := "/beego/*" // splat463	path := "/beego/routes/routes"464465	mux := NewControllerRegister()466467	mux.InsertFilter("*", BeforeExec, beegoResetParams, true, true)468469	mux.Get(route, beegoHandleResetParams)470471	rw, r := testRequest("GET", path)472	mux.ServeHTTP(rw, r)473474	// The two functions, `beegoResetParams` and `beegoHandleResetParams` add475	// a response header of `Splat`.  The expectation here is that that Header476	// value should match what the _request's_ router set, not the filter's.477478	headers := rw.HeaderMap479	if len(headers["Splat"]) != 1 {480		t.Errorf(481			"%s: There was an error in the test. Splat param not set in Header",482			testName)483	}484	if headers["Splat"][0] != "routes/routes" {485		t.Errorf(486			"%s: expected `:splat` param to be [routes/routes] but it was [%s]",487			testName, headers["Splat"][0])488	}489}490491// Execution point: BeforeRouter492// expectation: only BeforeRouter function is executed, notmatch output as router doesn't handle493func TestFilterBeforeRouter(t *testing.T) {494	testName := "TestFilterBeforeRouter"495	url := "/beforeRouter"496497	mux := NewControllerRegister()498	mux.InsertFilter(url, BeforeRouter, beegoBeforeRouter1)499500	mux.Get(url, beegoFilterFunc)501502	rw, r := testRequest("GET", url)503	mux.ServeHTTP(rw, r)504505	if strings.Contains(rw.Body.String(), "BeforeRouter1") == false {506		t.Errorf(testName + " BeforeRouter did not run")507	}508	if strings.Contains(rw.Body.String(), "hello") == true {509		t.Errorf(testName + " BeforeRouter did not return properly")510	}511}512513// Execution point: BeforeExec514// expectation: only BeforeExec function is executed, match as router determines route only515func TestFilterBeforeExec(t *testing.T) {516	testName := "TestFilterBeforeExec"517	url := "/beforeExec"518519	mux := NewControllerRegister()520	mux.InsertFilter(url, BeforeRouter, beegoFilterNoOutput)521	mux.InsertFilter(url, BeforeExec, beegoBeforeExec1)522523	mux.Get(url, beegoFilterFunc)524525	rw, r := testRequest("GET", url)526	mux.ServeHTTP(rw, r)527528	if strings.Contains(rw.Body.String(), "BeforeExec1") == false {529		t.Errorf(testName + " BeforeExec did not run")530	}531	if strings.Contains(rw.Body.String(), "hello") == true {
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...22func (f *RateLimitFilter) Run(ctx *agw_context.AGWContext) (Code int, err error) {23	if ctx.RouteInfo.Limiter == nil {24		return f.baseFilter.Run(ctx)25	}26	beforeAvailable := ctx.RouteInfo.Limiter.Available()27	if !ctx.RouteInfo.Limiter.Do(1) {28		logger.Warn("[RateLimitFilter-Run] rate limit: before_available=%v", beforeAvailable)29		return http.StatusServiceUnavailable, nil30	}31	logger.Info("[RateLimitFilter-Run] before_available=%v, after_available=%v", beforeAvailable,32		ctx.RouteInfo.Limiter.Available())33	return f.baseFilter.Run(ctx)34}...

1import "fmt"2type Filter func(string) string3func sayHelloWithFilter(name string, filter Filter) {4	nameFiltered := filter(name)5	fmt.Println("Hello, ", nameFiltered)6}7type Filter2 struct {8}9func (filter Filter2) spamFilter(name string) string {10	if name == "Anjing" {11	} else {12	}13}14func main() {15	filter := Filter2{}16	sayHelloWithFilter("Wahyu", filter.spamFilter)17	sayHelloWithFilter("Anjing", filter.spamFilter)18}

1public class Filter {2    public void execute(String request){3        System.out.println("request log: " + request);4    }5}6public class AuthenticationFilter implements Filter {7    public void execute(String request){8        System.out.println("authenticating request: " + request);9    }10}11public class DebugFilter implements Filter {12    public void execute(String request){13        System.out.println("request record: " + request);14    }15}16public class Client {17    FilterManager filterManager;18    public void setFilterManager(FilterManager filterManager){19        this.filterManager = filterManager;20    }21    public void sendRequest(String request){22        filterManager.filterRequest(request);23    }24}25public class FilterChain {26    private List<Filter> filters = new ArrayList<Filter>();27    private Target target;28    public void addFilter(Filter filter){29        filters.add(filter);30    }31    public void execute(String request){32        for (Filter filter : filters) {33            filter.execute(request);34        }35        target.execute(request);36    }37    public void setTarget(Target target){38        this.target = target;39    }40}41public class FilterManager {42    FilterChain filterChain;43    public FilterManager(Target target){44        filterChain = new FilterChain();45        filterChain.setTarget(target);46    }47    public void setFilter(Filter filter){48        filterChain.addFilter(filter);49    }50    public void filterRequest(String request){51        filterChain.execute(request);52    }53}54public class Target {55    public void execute(String request){56        System.out.println("Executing request: " + request);57    }58}59public class Demo {60    public static void main(String[] args) {61        Client client = new Client();62        FilterManager filterManager = new FilterManager(new Target());63        filterManager.setFilter(new AuthenticationFilter());64        filterManager.setFilter(new DebugFilter());65        client.setFilterManager(filterManager);66        client.sendRequest("

1import (2func main() {3	http.HandleFunc("/", filter)4	log.Fatal(http.ListenAndServe("localhost:8000", nil))5}6func handler(w http.ResponseWriter, r *http.Request) {7	fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)8}9func filter(w http.ResponseWriter, r *http.Request) {10	if strings.Contains(r.URL.Path, "1") {11		fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)12	} else {13		fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)14	}15}16func filter(w http.ResponseWriter, r *http.Request) {17	if !strings.Contains(r.URL.Path, "1") {18		http.NotFound(w, r)19	}20	fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)21}22func handler(w http.ResponseWriter, r *http.Request) {23	fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)24}25func filter(w http.ResponseWriter, r *http.Request) {26	if strings.Contains(r.URL.Path, "1") {27		fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)28	} else {29		http.NotFound(w, r)30	}31}32func filter(w http.ResponseWriter, r *http.Request) {33	if strings.Contains(r.URL.Path, "1") {34		fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)35	} else {36		http.NotFound(w, r)37	}38}39func handler(w http.ResponseWriter, r *http.Request)

1import (2func main() {3	names := []string{"samantha", "george", "jenny", "elizabeth", "daniel"}4	filteredNames := filter(names, func(value string) bool {5		return strings.HasPrefix(value, "e")6	})7	fmt.Println(filteredNames)8}9func filter(data []string, callback func(string) bool) []string {10	for _, value := range data {11		if filtered := callback(value); filtered {12			result = append(result, value)13		}14	}15}