How to use fetch method of loader Package

Best K6 code snippet using loader.fetch

dataloader.go

Source:dataloader.go Github

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...16 muPool sync.Pool17 waitGroupPool sync.Pool18 bufPairPool sync.Pool19 bufPairSlicePool sync.Pool20 fetcher *Fetcher21}22func (df *dataLoaderFactory) getWaitGroup() *sync.WaitGroup {23 return df.waitGroupPool.Get().(*sync.WaitGroup)24}25func (df *dataLoaderFactory) freeWaitGroup(wg *sync.WaitGroup) {26 df.waitGroupPool.Put(wg)27}28func (df *dataLoaderFactory) getBufPairSlicePool() *[]*BufPair {29 return df.bufPairSlicePool.Get().(*[]*BufPair)30}31func (df *dataLoaderFactory) freeBufPairSlice(slice *[]*BufPair) {32 for i := range *slice {33 df.freeBufPair((*slice)[i])34 }35 *slice = (*slice)[:0]36 df.bufPairSlicePool.Put(slice)37}38func (df *dataLoaderFactory) getBufPair() *BufPair {39 return df.bufPairPool.Get().(*BufPair)40}41func (df *dataLoaderFactory) freeBufPair(pair *BufPair) {42 pair.Data.Reset()43 pair.Errors.Reset()44 df.bufPairPool.Put(pair)45}46func (df *dataLoaderFactory) getMutex() *sync.Mutex {47 return df.muPool.Get().(*sync.Mutex)48}49func (df *dataLoaderFactory) freeMutex(mu *sync.Mutex) {50 df.muPool.Put(mu)51}52func newDataloaderFactory(fetcher *Fetcher) *dataLoaderFactory {53 return &dataLoaderFactory{54 muPool: sync.Pool{55 New: func() interface{} {56 return &sync.Mutex{}57 },58 },59 waitGroupPool: sync.Pool{60 New: func() interface{} {61 return &sync.WaitGroup{}62 },63 },64 bufPairPool: sync.Pool{65 New: func() interface{} {66 pair := BufPair{67 Data: fastbuffer.New(),68 Errors: fastbuffer.New(),69 }70 return &pair71 },72 },73 bufPairSlicePool: sync.Pool{74 New: func() interface{} {75 slice := make([]*BufPair, 0, 24)76 return &slice77 },78 },79 dataloaderPool: sync.Pool{80 New: func() interface{} {81 return &dataLoader{82 fetches: make(map[int]fetchState),83 inUseBufPair: make([]*BufPair, 0, 8),84 }85 },86 },87 fetcher: fetcher,88 }89}90// newDataLoader returns new instance of dataLoader.91// initialValue represents data from subscription, initialValue will be saved with initialValueID id and could be used92// for further fetches.93func (df *dataLoaderFactory) newDataLoader(initialValue []byte) *dataLoader {94 dataloader := df.dataloaderPool.Get().(*dataLoader)95 dataloader.mu = df.getMutex()96 dataloader.resourceProvider = df97 dataloader.fetcher = df.fetcher98 if initialValue != nil {99 buf := dataloader.getResultBufPair()100 buf.Data.WriteBytes(initialValue)101 dataloader.fetches[initialValueID] = &batchFetchState{102 nextIdx: 0,103 fetchError: nil,104 results: []*BufPair{buf},105 }106 }107 return dataloader108}109func (df *dataLoaderFactory) freeDataLoader(d *dataLoader) {110 for _, pair := range d.inUseBufPair {111 d.resourceProvider.freeBufPair(pair)112 }113 d.resourceProvider.freeMutex(d.mu)114 d.inUseBufPair = d.inUseBufPair[:0]115 d.fetches = nil116}117// dataLoader118type dataLoader struct {119 fetches map[int]fetchState120 mu *sync.Mutex121 fetcher *Fetcher122 resourceProvider *dataLoaderFactory123 inUseBufPair []*BufPair124}125// Load fetches concurrently data for all siblings.126func (d *dataLoader) Load(ctx *Context, fetch *SingleFetch, responsePair *BufPair) (err error) {127 var fetchResult fetchState128 var resultPair *BufPair129 fetchResult, ok := d.getFetchState(fetch.BufferId)130 if ok {131 resultPair, err = fetchResult.next(ctx)132 copyBufPair(responsePair, resultPair)133 return134 }135 fetchResult = &batchFetchState{}136 parentResult, ok := d.getFetchState(ctx.lastFetchID)137 if !ok { // it must be root query without subscription data138 buf := d.resourceProvider.getBufPair()139 defer d.resourceProvider.freeBufPair(buf)140 if err := fetch.InputTemplate.Render(ctx, nil, buf.Data); err != nil {141 return err142 }143 pair := d.getResultBufPair()144 err = d.fetcher.Fetch(ctx, fetch, buf.Data, pair)145 fetchResult = &singleFetchState{146 fetchErrors: []error{err},147 results: []*BufPair{pair},148 }149 d.setFetchState(fetchResult, fetch.BufferId)150 resultPair, err = fetchResult.next(ctx)151 copyBufPair(responsePair, resultPair)152 return153 }154 fetchParams, err := d.selectedDataForFetch(parentResult.data(), ctx.responseElements...)155 if err != nil {156 return err157 }158 if fetchResult, err = d.resolveSingleFetch(ctx, fetch, fetchParams); err != nil {159 return err160 }161 d.setFetchState(fetchResult, fetch.BufferId)162 resultPair, err = fetchResult.next(ctx)163 copyBufPair(responsePair, resultPair)164 return165}166// LoadBatch builds and resolve batch request for all siblings.167func (d *dataLoader) LoadBatch(ctx *Context, batchFetch *BatchFetch, responsePair *BufPair) (err error) {168 var fetchResult fetchState169 var resultPair *BufPair170 fetchResult, ok := d.getFetchState(batchFetch.Fetch.BufferId)171 if ok {172 resultPair, err = fetchResult.next(ctx)173 copyBufPair(responsePair, resultPair)174 return175 }176 fetchResult = &batchFetchState{}177 parentResult, ok := d.getFetchState(ctx.lastFetchID)178 if !ok {179 return fmt.Errorf("has not got fetch for %d", ctx.lastFetchID)180 }181 fetchParams, err := d.selectedDataForFetch(parentResult.data(), ctx.responseElements...)182 if err != nil {183 return err184 }185 if fetchResult, err = d.resolveBatchFetch(ctx, batchFetch, fetchParams); err != nil {186 return err187 }188 d.setFetchState(fetchResult, batchFetch.Fetch.BufferId)189 resultPair, err = fetchResult.next(ctx)190 copyBufPair(responsePair, resultPair)191 return192}193func (d *dataLoader) resolveBatchFetch(ctx *Context, batchFetch *BatchFetch, fetchParams [][]byte) (fetchState *batchFetchState, err error) {194 inputBufs := make([]*fastbuffer.FastBuffer, 0, len(fetchParams))195 bufSlice := d.resourceProvider.getBufPairSlicePool()196 defer d.resourceProvider.freeBufPairSlice(bufSlice)197 for i := range fetchParams {198 bufPair := d.resourceProvider.getBufPair()199 *bufSlice = append(*bufSlice, bufPair)200 if err := batchFetch.Fetch.InputTemplate.Render(ctx, fetchParams[i], bufPair.Data); err != nil {201 return nil, err202 }203 inputBufs = append(inputBufs, bufPair.Data)204 }205 outBuf := d.resourceProvider.getBufPair()206 *bufSlice = append(*bufSlice, outBuf)207 results := make([]*BufPair, len(inputBufs))208 for i := range inputBufs {209 results[i] = d.getResultBufPair()210 }211 fetchState = &batchFetchState{}212 if err = d.fetcher.FetchBatch(ctx, batchFetch, inputBufs, results); err != nil {213 fetchState.fetchError = err214 return fetchState, nil215 }216 fetchState.results = results217 return fetchState, nil218}219func (d *dataLoader) resolveSingleFetch(ctx *Context, fetch *SingleFetch, fetchParams [][]byte) (fetchState *singleFetchState, err error) {220 wg := d.resourceProvider.getWaitGroup()221 defer d.resourceProvider.freeWaitGroup(wg)222 wg.Add(len(fetchParams))223 type fetchResult struct {224 result *BufPair225 err error226 pos int227 }228 resultCh := make(chan fetchResult, len(fetchParams))229 bufSlice := d.resourceProvider.getBufPairSlicePool()230 defer d.resourceProvider.freeBufPairSlice(bufSlice)231 for i, val := range fetchParams {232 bufPair := d.resourceProvider.getBufPair()233 *bufSlice = append(*bufSlice, bufPair)234 if err := fetch.InputTemplate.Render(ctx, val, bufPair.Data); err != nil {235 return nil, err236 }237 pair := d.getResultBufPair()238 go func(pos int, pair *BufPair) {239 err := d.fetcher.Fetch(ctx, fetch, bufPair.Data, pair)240 resultCh <- fetchResult{result: pair, err: err, pos: pos}241 wg.Done()242 }(i, pair)243 }244 go func() {245 wg.Wait()246 close(resultCh)247 }()248 fetchState = &singleFetchState{249 fetchErrors: make([]error, len(fetchParams)),250 results: make([]*BufPair, len(fetchParams)),251 }252 for res := range resultCh {253 fetchState.fetchErrors[res.pos] = res.err254 fetchState.results[res.pos] = res.result255 }256 return fetchState, err257}258func (d *dataLoader) getFetchState(fetchID int) (batchState fetchState, ok bool) {259 d.mu.Lock()260 defer d.mu.Unlock()261 batchState, ok = d.fetches[fetchID]262 return263}264func (d *dataLoader) setFetchState(batchState fetchState, fetchID int) {265 d.mu.Lock()266 defer d.mu.Unlock()267 d.fetches[fetchID] = batchState268}269func (d *dataLoader) selectedDataForFetch(input [][]byte, path ...string) ([][]byte, error) {270 if len(path) == 0 {271 return input, nil272 }273 current, rest := path[0], path[1:]274 if current == arrayElementKey {275 return flatMap(input, func(val []byte) ([][]byte, error) {276 var vals [][]byte277 _, err := jsonparser.ArrayEach(val, func(value []byte, dataType jsonparser.ValueType, offset int, err error) {278 vals = append(vals, value)279 })280 if err != nil { // In case if array is null281 return nil, nil282 }283 return d.selectedDataForFetch(vals, rest...)284 })285 }286 temp := make([][]byte, 0, len(input))287 for i := range input {288 el, dataType, _, err := jsonparser.Get(input[i], current)289 if dataType == jsonparser.NotExist {290 // The input has an object that doesn't contain the path component.291 // This can happen in the following situation. Consider the292 // following query:293 //294 // {295 // someArrayWithInterfaceItem {296 // ... on A {297 // aField {298 // id299 // fieldFromAnotherService # <- this is federated300 // }301 // }302 // ... on B {303 // someOtherField304 // }305 // }306 // }307 //308 // The result after fetching someArrayWithInterfaceItem might be:309 // {310 // "data": {311 // "someArrayWithInterfaceItem": [312 // {"__typename": "A", "aField": {"id": 1}},313 // {"__typename": "B", "someOtherField": "hello"},314 // {"__typename": "A", "aField": {"id": 2}}315 // ]316 // }317 //318 // When resolving the fieldFromAnotherService field, we should319 // only look at the type "A" inputs, since those are the only320 // objects the someArrayWithInterfaceItem fetch applies to. In321 // other words, inputs without "aField" are skipped.322 continue323 }324 if err != nil {325 return nil, err326 }327 temp = append(temp, el)328 }329 return d.selectedDataForFetch(temp, rest...)330}331func (d *dataLoader) getResultBufPair() (pair *BufPair) {332 d.mu.Lock()333 defer d.mu.Unlock()334 pair = d.resourceProvider.bufPairPool.Get().(*BufPair)335 d.inUseBufPair = append(d.inUseBufPair, pair)336 return337}338type fetchState interface {339 data() [][]byte340 next(ctx *Context) (*BufPair, error)341}342type batchFetchState struct {343 nextIdx int344 fetchError error345 results []*BufPair346}347func (b *batchFetchState) data() [][]byte {348 dataSlice := make([][]byte, len(b.results))349 for i := range b.results {350 if b.results[i] != nil && b.results[i].HasData() {351 dataSlice[i] = b.results[i].Data.Bytes()352 }353 }354 return dataSlice355}356// next works correctly only with synchronous resolve strategy357// In case of asynchronous resolve strategy it's required to compute response position based on values from ctx (current path)358// But there is no reason for asynchronous resolve strategy, it's not useful, as all IO operations (fetching data) is be done by dataloader359func (b *batchFetchState) next(ctx *Context) (*BufPair, error) {360 if b.fetchError != nil {361 return nil, b.fetchError362 }363 res := b.results[b.nextIdx]364 b.nextIdx++365 return res, nil366}367type singleFetchState struct {368 nextIdx int369 fetchErrors []error370 results []*BufPair371}372func (b *singleFetchState) data() [][]byte {373 dataSlice := make([][]byte, len(b.results))374 for i := range b.results {375 if b.results[i] != nil && b.results[i].HasData() {376 dataSlice[i] = b.results[i].Data.Bytes()377 }378 }379 return dataSlice380}381// next works correctly only with synchronous resolve strategy382// In case of asynchronous resolve strategy it's required to compute response position based on values from ctx (current path)383// But there is no reason for asynchronous resolve strategy, it's not useful, as all IO operations (fetching data) is be done by dataloader384func (b *singleFetchState) next(ctx *Context) (*BufPair, error) {385 if b.fetchErrors[b.nextIdx] != nil {386 return nil, b.fetchErrors[b.nextIdx]387 }388 res := b.results[b.nextIdx]389 b.nextIdx++390 return res, nil391}392func flatMap(input [][]byte, f func(val []byte) ([][]byte, error)) ([][]byte, error) {393 var result [][]byte394 for i := range input {395 mapRes, err := f(input[i])396 if err != nil {397 return nil, err398 }399 result = append(result, mapRes...)400 }...

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content_fetcher_test.go

Source:content_fetcher_test.go Github

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...13 loader := NewMockContentLoader(ctrl)14 barFd := getFetchDefinitionMock(ctrl, loader, "/bar", nil, time.Millisecond*2, map[string]interface{}{"foo": "bar"})15 fooFd := getFetchDefinitionMock(ctrl, loader, "/foo", []*FetchDefinition{barFd}, time.Millisecond*2, map[string]interface{}{"bli": "bla"})16 bazzFd := getFetchDefinitionMock(ctrl, loader, "/bazz", []*FetchDefinition{barFd}, time.Millisecond, map[string]interface{}{})17 fetcher := NewContentFetcher(nil)18 fetcher.Loader = loader19 fetcher.AddFetchJob(fooFd)20 fetcher.AddFetchJob(bazzFd)21 results := fetcher.WaitForResults()22 a.Equal(3, len(results))23 a.Equal("/foo", results[0].Def.URL)24 a.Equal("/bazz", results[1].Def.URL)25 a.Equal("/bar", results[2].Def.URL)26 meta := fetcher.MetaJSON()27 a.Equal("bar", meta["foo"])28 a.Equal("bla", meta["bli"])29 a.False(fetcher.Empty())30}31func Test_ContentFetcher_Empty(t *testing.T) {32 ctrl := gomock.NewController(t)33 defer ctrl.Finish()34 a := assert.New(t)35 loader := NewMockContentLoader(ctrl)36 fetcher := NewContentFetcher(nil)37 fetcher.Loader = loader38 a.True(fetcher.Empty())39}40func Test_ContentFetcher_LazyDependencies(t *testing.T) {41 ctrl := gomock.NewController(t)42 defer ctrl.Finish()43 a := assert.New(t)44 loader := NewMockContentLoader(ctrl)45 parent := NewFetchDefinition("/parent")46 content := NewMockContent(ctrl)47 loader.EXPECT().48 Load(parent).49 Return(content, nil)50 content.EXPECT().51 RequiredContent().52 Return([]*FetchDefinition{})53 content.EXPECT().54 Meta().55 Return(nil)56 content.EXPECT().57 Dependencies().58 Return(map[string]Params{"child": Params{"foo": "bar"}})59 child := getFetchDefinitionMock(ctrl, loader, "/child", nil, time.Millisecond*2, nil)60 fetcher := NewContentFetcher(nil)61 fetcher.Loader = loader62 fetcher.SetFetchDefinitionFactory(func(name string, params Params) (fd *FetchDefinition, exist bool, err error) {63 a.Equal("child", name)64 a.Equal("bar", params["foo"])65 return child, true, nil66 })67 fetcher.AddFetchJob(parent)68 results := fetcher.WaitForResults()69 a.Equal(2, len(results))70 a.False(fetcher.Empty())71 a.Equal("/parent", results[0].Def.URL)72 a.Equal("/child", results[1].Def.URL)73}74func getFetchDefinitionMock(ctrl *gomock.Controller, loaderMock *MockContentLoader, url string, requiredContent []*FetchDefinition, loaderBlocking time.Duration, metaJSON map[string]interface{}) *FetchDefinition {75 fd := NewFetchDefinition(url)76 fd.Timeout = time.Second * 4277 content := NewMockContent(ctrl)78 content.EXPECT().79 RequiredContent().80 Return(requiredContent)81 content.EXPECT().82 Meta().83 Return(metaJSON)84 content.EXPECT().85 Dependencies().86 Return(map[string]Params{})87 loaderMock.EXPECT().88 Load(fd).89 Do(90 func(fetchDefinition *FetchDefinition) {91 time.Sleep(loaderBlocking)92 }).93 Return(content, nil)94 return fd95}96func Test_ContentFetchResultPrioritySort(t *testing.T) {97 a := assert.New(t)98 barFd := NewFetchDefinition("/bar").WithPriority(30)99 fooFd := NewFetchDefinition("/foo").WithPriority(10)100 bazzFd := NewFetchDefinition("/bazz").WithPriority(5)101 results := []*FetchResult{{Def: barFd}, {Def: fooFd}, {Def: bazzFd}}102 a.Equal(30, results[0].Def.Priority)103 a.Equal(10, results[1].Def.Priority)104 a.Equal(5, results[2].Def.Priority)105 sort.Sort(FetchResults(results))106 a.Equal(5, results[0].Def.Priority)107 a.Equal(10, results[1].Def.Priority)108 a.Equal(30, results[2].Def.Priority)109}110func Test_ContentFetcher_PriorityOrderAfterFetchCompletion(t *testing.T) {111 ctrl := gomock.NewController(t)112 defer ctrl.Finish()113 a := assert.New(t)114 loader := NewMockContentLoader(ctrl)115 barFd := getFetchDefinitionMock(ctrl, loader, "/bar", nil, time.Millisecond*2, map[string]interface{}{"foo": "bar"})116 barFd.Priority = 1024117 fooFd := getFetchDefinitionMock(ctrl, loader, "/foo", nil, time.Millisecond*2, map[string]interface{}{"bli": "bla"})118 fooFd.Priority = 211119 bazzFd := getFetchDefinitionMock(ctrl, loader, "/bazz", nil, time.Millisecond, map[string]interface{}{})120 bazzFd.Priority = 412121 fetcher := NewContentFetcher(nil)122 fetcher.Loader = loader123 fetcher.AddFetchJob(barFd)124 fetcher.AddFetchJob(fooFd)125 fetcher.AddFetchJob(bazzFd)126 results := fetcher.WaitForResults()127 a.Equal(211, results[0].Def.Priority)128 a.Equal(412, results[1].Def.Priority)129 a.Equal(1024, results[2].Def.Priority)130}...

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alertloader.go

Source:alertloader.go Github

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...17 p.alertLoader = newLoader(ctx, loaderConfig{18 Max: 100,19 Delay: time.Millisecond,20 IDFunc: func(v interface{}) string { return strconv.Itoa(v.(*alert.Alert).ID) },21 FetchFunc: p.fetchAlerts,22 })23 p.stateLoader = newLoader(ctx, loaderConfig{24 Max: 100,25 Delay: time.Millisecond,26 IDFunc: func(v interface{}) string { return strconv.Itoa(v.(*alert.State).AlertID) },27 FetchFunc: p.fetchAlertsState,28 })29 return p30}31func (l *AlertLoader) Close() error {32 l.alertLoader.Close()33 l.stateLoader.Close()34 return nil35}36func (l *AlertLoader) FetchOneAlert(ctx context.Context, id int) (*alert.Alert, error) {37 v, err := l.alertLoader.FetchOne(ctx, strconv.Itoa(id))38 if err != nil {39 return nil, err40 }41 if v == nil {42 return nil, err43 }44 return v.(*alert.Alert), nil45}46func (l *AlertLoader) FetchOneAlertState(ctx context.Context, alertID int) (*alert.State, error) {47 v, err := l.stateLoader.FetchOne(ctx, strconv.Itoa(alertID))48 if err != nil {49 return nil, err50 }51 if v == nil {52 return nil, err53 }54 return v.(*alert.State), nil55}56func (l *AlertLoader) fetchAlerts(ctx context.Context, ids []string) ([]interface{}, error) {57 intIDs := make([]int, len(ids))58 for i, id := range ids {59 intIDs[i], _ = strconv.Atoi(id)60 }61 many, err := l.store.FindMany(ctx, intIDs)62 if err != nil {63 return nil, err64 }65 res := make([]interface{}, len(many))66 for i := range many {67 res[i] = &many[i]68 }69 return res, nil70}71func (l *AlertLoader) fetchAlertsState(ctx context.Context, ids []string) ([]interface{}, error) {72 intIDs := make([]int, len(ids))73 for i, id := range ids {74 intIDs[i], _ = strconv.Atoi(id)75 }76 many, err := l.store.State(ctx, intIDs)77 if err != nil {78 return nil, err79 }80 res := make([]interface{}, len(many))81 for i := range many {82 res[i] = &many[i]83 }84 return res, nil85}...

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fetch

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1import (2func main() {3 for _, url := range os.Args[1:] {4 resp, err := http.Get(url)5 if err != nil {6 fmt.Fprintf(os.Stderr, "fetch: %v7 os.Exit(1)8 }9 b, err := ioutil.ReadAll(resp.Body)10 resp.Body.Close()11 if err != nil {12 fmt.Fprintf(os.Stderr, "fetch: reading %s: %v13 os.Exit(1)14 }15 fmt.Printf("%s", b)16 }17}

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1import (2func main() {3 if err != nil {4 panic(err)5 }6 defer resp.Body.Close()7 fmt.Println("Response status:", resp.Status)8}9import (10func main() {11 var jsonStr = []byte(`{"title":"Buy cheese and bread for breakfast."}`)12 req.Header.Set("X-Custom-Header", "myvalue")13 req.Header.Set("Content-Type", "application/json")14 client := &http.Client{}15 resp, err := client.Do(req)16 if err != nil {17 panic(err)18 }19 defer resp.Body.Close()20 fmt.Println("response Status:", resp.Status)21 fmt.Println("response Headers:", resp.Header)22 body, _ := ioutil.ReadAll(resp.Body)23 fmt.Println("response Body:", string(body))24}25response Headers: map[Content-Type:[application/json; charset=utf-8] Date:[Thu, 19 Apr 2018 09:13:45 GMT] Content-Length:[50]]26response Body: {"id":1,"title":"Buy cheese and bread for breakfast."}27import (28func main() {29 if err != nil {30 panic(err)31 }32 fmt.Println("Response Headers:", resp.Header)33}34Response Headers: map[Content-Type:[text/html; charset=utf-8] Date:[Thu, 19 Apr 2018 09:19:14 GMT] Content-Length:[0]]35import (

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fetch

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1import (2func main() {3 if err != nil {4 fmt.Println("Error in getting response")5 }6 defer resp.Body.Close()7 body, err := ioutil.ReadAll(resp.Body)8 if err != nil {9 fmt.Println("Error in reading response")10 }11 fmt.Println(string(body))12}

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fetch

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1import java.net.URL;2import java.net.URLClassLoader;3import java.lang.reflect.Method;4import java.io.File;5import java.io.IOException;6import java.io.FileOutputStream;7import java.io.InputStream;8import java.io.OutputStream;9public class 1 {10 public static void main(String args[]) throws Exception {11 File jarFile = new File("loader.jar");12 if (!jarFile.exists()) {13 jarFile.createNewFile();14 InputStream in = 1.class.getResourceAsStream("/loader.jar");15 OutputStream out = new FileOutputStream(jarFile);16 byte[] buffer = new byte[1024];17 int length;18 while ((length = in.read(buffer)) > 0) {19 out.write(buffer, 0, length);20 }21 in.close();22 out.close();23 }24 URLClassLoader loader = new URLClassLoader(new URL[] { jarFile.toURI().toURL() });25 Class<?> c = loader.loadClass("loader");26 Method method = c.getMethod("fetch");27 method.invoke(c.newInstance());28 }29}30import java.io.BufferedReader;31import java.io.IOException;32import java.io.InputStreamReader;33import java.net.URL;34import java.net.URLConnection;35public class loader {36 public static void fetch() throws IOException {37 URLConnection con = url.openConnection();38 BufferedReader in = new BufferedReader(39 new InputStreamReader(40 con.getInputStream()));41 String inputLine;42 while ((inputLine = in.readLine()) != null) 43 System.out.println(inputLine);44 in.close();45 }46}47I have a Java application that I want to distribute as a single jar file. I have a number of dependencies that I would like to include in the jar file. I have been looking at the Java Service Launcher (JSVC) that allows me to create a service out of a Java application. I have also looked at the Apache Commons Daemon project. It seems like both of these projects could be used to create a single jar file that would include all the dependencies. The problem is that I can't figure out how to invoke the main method of the Java application. I would like to be able to run it as a service or a stand-alone application. Is there a way to do this using JSVC or Apache Commons Daemon? If not, are there any other tools that would allow me to do this?

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1public class Test{2 public static void main(String[] args){3 try{4 Class c = ClassLoader.getSystemClassLoader().loadClass("Hello");5 System.out.println(c);6 }catch(Exception e){7 System.out.println(e);8 }9 }10}11public class Test{12 public static void main(String[] args){13 try{14 Class c = Class.forName("Hello");15 System.out.println(c);16 }catch(Exception e){17 System.out.println(e);18 }19 }20}21public class Test{22 public static void main(String[] args){23 try{24 Class c = Class.forName("Hello", true, ClassLoader.getSystemClassLoader());25 System.out.println(c);26 }catch(Exception e){27 System.out.println(e);28 }29 }30}31public class Test{32 public static void main(String[] args){33 try{34 Class c = Class.forName("Hello", true, ClassLoader.getSystemClassLoader());35 System.out.println(c);36 }catch(Exception e){37 System.out.println(e);38 }39 }40}41public class Test{42 public static void main(String[] args){43 try{44 Class c = Class.forName("Hello", true, ClassLoader.getSystemClassLoader());45 System.out.println(c);46 }catch(Exception e){47 System.out.println(e);48 }49 }50}51public class Test{52 public static void main(String[] args){53 try{54 Class c = Class.forName("Hello", true, ClassLoader.getSystemClassLoader());55 System.out.println(c);56 }catch(Exception e){57 System.out.println(e);58 }59 }60}61public class Test{62 public static void main(String[] args){63 try{64 Class c = Class.forName("Hello", true, ClassLoader.getSystemClassLoader());

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1import (2func main() {3 loader := new(Loader)4 loader.fetch()5}6import (7func main() {8 loader := new(Loader)9 loader.fetch()10}11import (12func main() {13 loader := new(Loader)14 loader.fetch()15}16import (17func main() {18 loader := new(Loader)19 loader.fetch()20}21import (22func main() {23 loader := new(Loader)24 loader.fetch()25}26import (27func main() {28 loader := new(Loader)29 loader.fetch()30}31import (32func main() {33 loader := new(Loader)34 loader.fetch()35}36import (37func main() {38 loader := new(Loader)39 loader.fetch()40}41import (42func main() {43 loader := new(Loader)44 loader.fetch()45}46import (47func main() {48 loader := new(Loader)49 loader.fetch()50}

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1import (2func main() {3 resp, err := http.Get(url)4 if err != nil {5 fmt.Println(err)6 os.Exit(1)7 }8 defer resp.Body.Close()9 body, err := ioutil.ReadAll(resp.Body)10 if err != nil {11 fmt.Println(err)12 os.Exit(1)13 }14 fmt.Println(string(body))15}16import (17func main() {18 resp, err := http.Get(url)19 if err != nil {20 fmt.Println(err)21 os.Exit(1)22 }23 defer resp.Body.Close()24 body, err := ioutil.ReadAll(resp.Body)25 if err != nil {26 fmt.Println(err)27 os.Exit(1)28 }29 fmt.Println(string(body))30}31import (32func main() {33 resp, err := http.Get(url)34 if err != nil {35 fmt.Println(err)36 os.Exit(1)37 }38 defer resp.Body.Close()39 body, err := ioutil.ReadAll(resp.Body)40 if err != nil {41 fmt.Println(err)42 os.Exit(1)43 }44 fmt.Println(string(body))45}46import (47func main() {48 resp, err := http.Get(url)49 if err != nil {50 fmt.Println(err)51 os.Exit(1

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1import (2func main() {3 l := &loader{}4 if err != nil {5 fmt.Println(err)6 }7 fmt.Println(string(content))8}9import (10func main() {11 l := &loader{}12 if err != nil {13 fmt.Println(err)14 }15 fmt.Println(string(content))16}17import (18func main() {19 l := &loader{}20 if err != nil {21 fmt.Println(err)22 }23 fmt.Println(string(content))24}25import (26func main() {27 l := &loader{}28 if err != nil {29 fmt.Println(err)30 }31 fmt.Println(string(content))32}33import (34func main() {

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1import (2func main() {3 content, err := ioutil.ReadFile("test.txt")4 if err != nil {5 log.Fatal(err)6 }7 fmt.Println("Content of the file:")8 fmt.Printf("%s", content)9}

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1import (2func main() {3 if err != nil {4 fmt.Println(err)5 }6 body, err := ioutil.ReadAll(resp.Body)7 if err != nil {8 fmt.Println(err)9 }10 str := string(body)11 split := strings.Split(str, " ")12 fmt.Println(split[1])13}

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Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.

LambdaTest Learning Hubs:

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You could also refer to video tutorials over LambdaTest YouTube channel to get step by step demonstration from industry experts.

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