How to use drain method of org.openqa.selenium.grid.node.Node class
Best Selenium code snippet using org.openqa.selenium.grid.node.Node.drain
Source:SauceNode.java 
...131 Require.nonNull("Registration secret", registrationSecret);132 this.healthCheck = healthCheck == null ?133 () -> new HealthCheck.Result(134 isDraining() ? DRAINING : UP,135 String.format("%s is %s", uri, isDraining() ? "draining" : "up")) :136 healthCheck;137 this.currentSessions = CacheBuilder.newBuilder()138 .expireAfterAccess(sessionTimeout)139 .ticker(ticker)140 .removalListener((RemovalListener<SessionId, SessionSlot>) notification -> {141 // Attempt to stop the session142 LOG.log(Debug.getDebugLogLevel(), "Stopping session {0}", notification.getKey().toString());143 SessionSlot slot = notification.getValue();144 if (!slot.isAvailable()) {145 slot.stop();146 }147 })148 .build();149 this.tempFileSystems = CacheBuilder.newBuilder()150 .expireAfterAccess(sessionTimeout)151 .ticker(ticker)152 .removalListener((RemovalListener<SessionId, TemporaryFilesystem>) notification -> {153 TemporaryFilesystem tempFS = notification.getValue();154 tempFS.deleteTemporaryFiles();155 tempFS.deleteBaseDir();156 })157 .build();158 Regularly sessionCleanup = new Regularly("Session Cleanup Node: " + externalUri);159 sessionCleanup.submit(currentSessions::cleanUp, Duration.ofSeconds(30), Duration.ofSeconds(30));160 Regularly tmpFileCleanup = new Regularly("TempFile Cleanup Node: " + externalUri);161 tmpFileCleanup.submit(tempFileSystems::cleanUp, Duration.ofSeconds(30), Duration.ofSeconds(30));162 Regularly regularHeartBeat = new Regularly("Heartbeat Node: " + externalUri);163 regularHeartBeat.submit(() -> bus.fire(new NodeHeartBeatEvent(getStatus())), heartbeatPeriod,164 heartbeatPeriod);165 bus.addListener(SessionClosedEvent.listener(id -> {166 // Listen to session terminated events so we know when to fire the NodeDrainComplete event167 if (this.isDraining()) {168 int done = pendingSessions.decrementAndGet();169 if (done <= 0) {170 LOG.info("Firing node drain complete message");171 bus.fire(new NodeDrainComplete(this.getId()));172 }173 }174 }));175 Runtime.getRuntime().addShutdownHook(new Thread(this::stopAllSessions));176 new JMXHelper().register(this);177 }178 public static SauceNode.Builder builder(179 Tracer tracer,180 EventBus bus,181 URI uri,182 URI gridUri,183 Secret registrationSecret) {184 return new SauceNode.Builder(tracer, bus, uri, gridUri, registrationSecret);185 }186 @Override187 public boolean isReady() {188 return bus.isReady();189 }190 @VisibleForTesting191 public int getCurrentSessionCount() {192 // It seems wildly unlikely we'll overflow an int193 return Math.toIntExact(currentSessions.size());194 }195 @ManagedAttribute(name = "MaxSessions")196 public int getMaxSessionCount() {197 return maxSessionCount;198 }199 @ManagedAttribute(name = "Status")200 public Availability getAvailability() {201 return isDraining() ? DRAINING : UP;202 }203 @ManagedAttribute(name = "TotalSlots")204 public int getTotalSlots() {205 return factories.size();206 }207 @ManagedAttribute(name = "UsedSlots")208 public long getUsedSlots() {209 return factories.stream().filter(sessionSlot -> !sessionSlot.isAvailable()).count();210 }211 @ManagedAttribute(name = "Load")212 public float getLoad() {213 long inUse = factories.stream().filter(sessionSlot -> !sessionSlot.isAvailable()).count();214 return inUse / (float) maxSessionCount * 100f;215 }216 @ManagedAttribute(name = "RemoteNodeUri")217 public URI getExternalUri() {218 return this.getUri();219 }220 @ManagedAttribute(name = "GridUri")221 public URI getGridUri() {222 return this.gridUri;223 }224 @ManagedAttribute(name = "NodeId")225 public String getNodeId() {226 return getId().toString();227 }228 @Override229 public boolean isSupporting(Capabilities capabilities) {230 return factories.parallelStream().anyMatch(factory -> factory.test(capabilities));231 }232 @Override233 public Either<WebDriverException, CreateSessionResponse> newSession(CreateSessionRequest sessionRequest) {234 Require.nonNull("Session request", sessionRequest);235 try (Span span = tracer.getCurrentContext().createSpan("node.new_session")) {236 Map<String, EventAttributeValue> attributeMap = new HashMap<>();237 attributeMap238 .put(AttributeKey.LOGGER_CLASS.getKey(), EventAttribute.setValue(getClass().getName()));239 LOG.fine("Creating new session using span: " + span);240 attributeMap.put("session.request.capabilities",241 EventAttribute.setValue(sessionRequest.getDesiredCapabilities().toString()));242 attributeMap.put("session.request.downstreamdialect",243 EventAttribute.setValue(sessionRequest.getDownstreamDialects().toString()));244 int currentSessionCount = getCurrentSessionCount();245 span.setAttribute("current.session.count", currentSessionCount);246 attributeMap.put("current.session.count", EventAttribute.setValue(currentSessionCount));247 if (getCurrentSessionCount() >= maxSessionCount) {248 span.setAttribute("error", true);249 span.setStatus(Status.RESOURCE_EXHAUSTED);250 attributeMap.put("max.session.count", EventAttribute.setValue(maxSessionCount));251 span.addEvent("Max session count reached", attributeMap);252 return Either.left(new RetrySessionRequestException("Max session count reached."));253 }254 if (isDraining()) {255 span.setStatus(Status.UNAVAILABLE.withDescription("The node is draining. Cannot accept new sessions."));256 return Either.left(257 new RetrySessionRequestException("The node is draining. Cannot accept new sessions."));258 }259 // Identify possible slots to use as quickly as possible to enable concurrent session starting260 SessionSlot slotToUse = null;261 synchronized(factories) {262 for (SessionSlot factory : factories) {263 if (!factory.isAvailable() || !factory.test(sessionRequest.getDesiredCapabilities())) {264 continue;265 }266 factory.reserve();267 slotToUse = factory;268 break;269 }270 }271 if (slotToUse == null) {272 span.setAttribute("error", true);273 span.setStatus(Status.NOT_FOUND);274 span.addEvent("No slot matched capabilities ", attributeMap);275 return Either.left(276 new RetrySessionRequestException("No slot matched the requested capabilities."));277 }278 Either<WebDriverException, ActiveSession> possibleSession = slotToUse.apply(sessionRequest);279 if (possibleSession.isRight()) {280 ActiveSession session = possibleSession.right();281 currentSessions.put(session.getId(), slotToUse);282 SessionId sessionId = session.getId();283 Capabilities caps = session.getCapabilities();284 SESSION_ID.accept(span, sessionId);285 CAPABILITIES.accept(span, caps);286 String downstream = session.getDownstreamDialect().toString();287 String upstream = session.getUpstreamDialect().toString();288 String sessionUri = session.getUri().toString();289 span.setAttribute(AttributeKey.DOWNSTREAM_DIALECT.getKey(), downstream);290 span.setAttribute(AttributeKey.UPSTREAM_DIALECT.getKey(), upstream);291 span.setAttribute(AttributeKey.SESSION_URI.getKey(), sessionUri);292 // The session we return has to look like it came from the node, since we might be dealing293 // with a webdriver implementation that only accepts connections from localhost294 boolean isSupportingCdp = slotToUse.isSupportingCdp() ||295 caps.getCapability("se:cdp") != null;296 Session externalSession = createExternalSession(session, externalUri, isSupportingCdp);297 return Either.right(new CreateSessionResponse(298 externalSession,299 getEncoder(session.getDownstreamDialect()).apply(externalSession)));300 } else {301 slotToUse.release();302 span.setAttribute("error", true);303 span.addEvent("Unable to create session with the driver", attributeMap);304 return Either.left(possibleSession.left());305 }306 }307 }308 @Override309 public boolean isSessionOwner(SessionId id) {310 Require.nonNull("Session ID", id);311 return currentSessions.getIfPresent(id) != null;312 }313 @Override314 public Session getSession(SessionId id) throws NoSuchSessionException {315 Require.nonNull("Session ID", id);316 SessionSlot slot = currentSessions.getIfPresent(id);317 if (slot == null) {318 throw new NoSuchSessionException("Cannot find session with id: " + id);319 }320 return createExternalSession(slot.getSession(), externalUri, slot.isSupportingCdp());321 }322 @Override323 public TemporaryFilesystem getTemporaryFilesystem(SessionId id) throws IOException {324 try {325 return tempFileSystems.get(id, () -> TemporaryFilesystem.getTmpFsBasedOn(326 TemporaryFilesystem.getDefaultTmpFS().createTempDir("session", id.toString())));327 } catch (ExecutionException e) {328 throw new IOException(e);329 }330 }331 @Override332 public HttpResponse executeWebDriverCommand(HttpRequest req) {333 // True enough to be good enough334 SessionId id = getSessionId(req.getUri()).map(SessionId::new)335 .orElseThrow(() -> new NoSuchSessionException("Cannot find session: " + req));336 SessionSlot slot = currentSessions.getIfPresent(id);337 if (slot == null) {338 throw new NoSuchSessionException("Cannot find session with id: " + id);339 }340 ActiveSession activeSession = slot.getSession();341 if (activeSession.getClass().getName().contains("RelaySessionFactory")) {342 HttpResponse toReturn = slot.execute(req);343 if (req.getMethod() == DELETE && req.getUri().equals("/session/" + id)) {344 stop(id);345 }346 return toReturn;347 }348 SauceDockerSession session = (SauceDockerSession) activeSession;349 SauceCommandInfo.Builder builder = new SauceCommandInfo.Builder();350 builder.setStartTime(Instant.now().toEpochMilli());351 HttpResponse toReturn = slot.execute(req);352 if (req.getMethod() == DELETE && req.getUri().equals("/session/" + id)) {353 stop(id);354 builder.setScreenshotId(-1);355 } else {356 // Only taking screenshots after a url has been loaded357 if (!session.canTakeScreenshot() && req.getMethod() == POST358 && req.getUri().endsWith("/url")) {359 session.enableScreenshots();360 }361 int screenshotId = takeScreenshot(session, req, slot);362 builder.setScreenshotId(screenshotId);363 }364 Map<String, Object> parsedResponse =365 JSON.toType(new InputStreamReader(toReturn.getContent().get()), MAP_TYPE);366 builder.setRequest(getRequestContents(req))367 .setResult(parsedResponse)368 .setPath(req.getUri().replace(String.format("/session/%s", id), ""))369 .setHttpStatus(toReturn.getStatus())370 .setHttpMethod(req.getMethod().name())371 .setStatusCode(0);372 if (parsedResponse.containsKey("value") && parsedResponse.get("value") != null373 && parsedResponse.get("value").toString().contains("error")) {374 builder.setStatusCode(1);375 }376 builder.setEndTime(Instant.now().toEpochMilli());377 session.addSauceCommandInfo(builder.build());378 return toReturn;379 }380 @Override381 public HttpResponse uploadFile(HttpRequest req, SessionId id) {382 // When the session is running in a Docker container, the upload file command383 // needs to be forwarded to the container as well.384 SessionSlot slot = currentSessions.getIfPresent(id);385 if (slot != null && slot.getSession() instanceof SauceDockerSession) {386 return executeWebDriverCommand(req);387 }388 Map<String, Object> incoming = JSON.toType(string(req), Json.MAP_TYPE);389 File tempDir;390 try {391 TemporaryFilesystem tempfs = getTemporaryFilesystem(id);392 tempDir = tempfs.createTempDir("upload", "file");393 Zip.unzip((String) incoming.get("file"), tempDir);394 } catch (IOException e) {395 throw new UncheckedIOException(e);396 }397 // Select the first file398 File[] allFiles = tempDir.listFiles();399 if (allFiles == null) {400 throw new WebDriverException(401 String.format("Cannot access temporary directory for uploaded files %s", tempDir));402 }403 if (allFiles.length != 1) {404 throw new WebDriverException(405 String.format("Expected there to be only 1 file. There were: %s", allFiles.length));406 }407 ImmutableMap<String, Object> result = ImmutableMap.of(408 "value", allFiles[0].getAbsolutePath());409 return new HttpResponse().setContent(asJson(result));410 }411 @Override412 public void stop(SessionId id) throws NoSuchSessionException {413 Require.nonNull("Session ID", id);414 SessionSlot slot = currentSessions.getIfPresent(id);415 if (slot == null) {416 throw new NoSuchSessionException("Cannot find session with id: " + id);417 }418 currentSessions.invalidate(id);419 tempFileSystems.invalidate(id);420 }421 private void stopAllSessions() {422 if (currentSessions.size() > 0) {423 LOG.info("Trying to stop all running sessions before shutting down...");424 currentSessions.invalidateAll();425 }426 }427 private Session createExternalSession(ActiveSession other, URI externalUri, boolean isSupportingCdp) {428 Capabilities toUse = ImmutableCapabilities.copyOf(other.getCapabilities());429 // Rewrite the se:options if necessary to send the cdp url back430 if (isSupportingCdp) {431 String cdpPath = String.format("/session/%s/se/cdp", other.getId());432 toUse = new PersistentCapabilities(toUse).setCapability("se:cdp", rewrite(cdpPath));433 }434 return new Session(other.getId(), externalUri, other.getStereotype(), toUse, Instant.now());435 }436 private URI rewrite(String path) {437 try {438 String scheme = "https".equals(gridUri.getScheme()) ? "wss" : "ws";439 return new URI(440 scheme,441 gridUri.getUserInfo(),442 gridUri.getHost(),443 gridUri.getPort(),444 path,445 null,446 null);447 } catch (URISyntaxException e) {448 throw new RuntimeException(e);449 }450 }451 @Override452 public NodeStatus getStatus() {453 Set<Slot> slots = factories.stream()454 .map(slot -> {455 Instant lastStarted = Instant.EPOCH;456 Session session = null;457 if (!slot.isAvailable()) {458 ActiveSession activeSession = slot.getSession();459 if (activeSession != null) {460 lastStarted = activeSession.getStartTime();461 session = new Session(462 activeSession.getId(),463 activeSession.getUri(),464 slot.getStereotype(),465 activeSession.getCapabilities(),466 activeSession.getStartTime());467 }468 }469 return new Slot(470 new SlotId(getId(), slot.getId()),471 slot.getStereotype(),472 lastStarted,473 session);474 })475 .collect(toImmutableSet());476 return new NodeStatus(477 getId(),478 externalUri,479 maxSessionCount,480 slots,481 isDraining() ? DRAINING : UP,482 heartbeatPeriod,483 getNodeVersion(),484 getOsInfo());485 }486 @Override487 public HealthCheck getHealthCheck() {488 return healthCheck;489 }490 @Override491 public void drain() {492 bus.fire(new NodeDrainStarted(getId()));493 draining = true;494 int currentSessionCount = getCurrentSessionCount();495 if (currentSessionCount == 0) {496 LOG.info("Firing node drain complete message");497 bus.fire(new NodeDrainComplete(getId()));498 } else {499 pendingSessions.set(currentSessionCount);500 }501 }502 private Map<String, Object> toJson() {503 return ImmutableMap.of(504 "id", getId(),505 "uri", externalUri,506 "maxSessions", maxSessionCount,507 "draining", isDraining(),508 "capabilities", factories.stream()509 .map(SessionSlot::getStereotype)510 .collect(Collectors.toSet()));511 }512 public static class Builder {513 private final Tracer tracer;514 private final EventBus bus;515 private final URI uri;516 private final URI gridUri;517 private final Secret registrationSecret;518 private final ImmutableList.Builder<SessionSlot> factories;519 private int maxCount = Runtime.getRuntime().availableProcessors() * 5;520 private Ticker ticker = Ticker.systemTicker();521 private Duration sessionTimeout = Duration.ofMinutes(5);...
Source:LocalNode.java
...134 Require.nonNull("Registration secret", registrationSecret);135 this.healthCheck = healthCheck == null ?136 () -> new HealthCheck.Result(137 isDraining() ? DRAINING : UP,138 String.format("%s is %s", uri, isDraining() ? "draining" : "up")) :139 healthCheck;140 this.currentSessions = CacheBuilder.newBuilder()141 .expireAfterAccess(sessionTimeout)142 .ticker(ticker)143 .removalListener((RemovalListener<SessionId, SessionSlot>) notification -> {144 // If we were invoked explicitly, then return: we know what we're doing.145 if (!notification.wasEvicted()) {146 return;147 }148 killSession(notification.getValue());149 })150 .build();151 this.tempFileSystems = CacheBuilder.newBuilder()152 .expireAfterAccess(sessionTimeout)153 .ticker(ticker)154 .removalListener((RemovalListener<SessionId, TemporaryFilesystem>) notification -> {155 TemporaryFilesystem tempFS = notification.getValue();156 tempFS.deleteTemporaryFiles();157 tempFS.deleteBaseDir();158 })159 .build();160 this.regularly = new Regularly("Local Node: " + externalUri);161 regularly.submit(currentSessions::cleanUp, Duration.ofSeconds(30), Duration.ofSeconds(30));162 regularly.submit(tempFileSystems::cleanUp, Duration.ofSeconds(30), Duration.ofSeconds(30));163 bus.addListener(NodeAddedEvent.listener(nodeId -> {164 if (getId().equals(nodeId)) {165 // Lets avoid to create more than one "Regularly" when the Node registers again.166 if (!heartBeatStarted.getAndSet(true)) {167 regularly.submit(168 () -> bus.fire(new NodeHeartBeatEvent(getStatus())), heartbeatPeriod, heartbeatPeriod);169 }170 }171 }));172 bus.addListener(SessionClosedEvent.listener(id -> {173 try {174 this.stop(id);175 } catch (NoSuchSessionException ignore) {176 }177 if (this.isDraining()) {178 int done = pendingSessions.decrementAndGet();179 if (done <= 0) {180 LOG.info("Firing node drain complete message");181 bus.fire(new NodeDrainComplete(this.getId()));182 }183 }184 }));185 new JMXHelper().register(this);186 }187 public static Builder builder(188 Tracer tracer,189 EventBus bus,190 URI uri,191 URI gridUri,192 Secret registrationSecret) {193 return new Builder(tracer, bus, uri, gridUri, registrationSecret);194 }195 @Override196 public boolean isReady() {197 return bus.isReady();198 }199 @VisibleForTesting200 @ManagedAttribute(name = "CurrentSessions")201 public int getCurrentSessionCount() {202 // It seems wildly unlikely we'll overflow an int203 return Math.toIntExact(currentSessions.size());204 }205 @ManagedAttribute(name = "MaxSessions")206 public int getMaxSessionCount() {207 return maxSessionCount;208 }209 @ManagedAttribute(name = "Status")210 public Availability getAvailability() {211 return isDraining() ? DRAINING : UP;212 }213 @ManagedAttribute(name = "TotalSlots")214 public int getTotalSlots() {215 return factories.size();216 }217 @ManagedAttribute(name = "UsedSlots")218 public long getUsedSlots() {219 return factories.stream().filter(sessionSlot -> !sessionSlot.isAvailable()).count();220 }221 @ManagedAttribute(name = "Load")222 public float getLoad() {223 long inUse = factories.stream().filter(sessionSlot -> !sessionSlot.isAvailable()).count();224 return inUse / (float) maxSessionCount * 100f;225 }226 @ManagedAttribute(name = "RemoteNodeUri")227 public URI getExternalUri() {228 return this.getUri();229 }230 @ManagedAttribute(name = "GridUri")231 public URI getGridUri() {232 return this.gridUri;233 }234 @ManagedAttribute(name = "NodeId")235 public String getNodeId() {236 return getId().toString();237 }238 @Override239 public boolean isSupporting(Capabilities capabilities) {240 return factories.parallelStream().anyMatch(factory -> factory.test(capabilities));241 }242 @Override243 public Either<WebDriverException, CreateSessionResponse> newSession(CreateSessionRequest sessionRequest) {244 Require.nonNull("Session request", sessionRequest);245 try (Span span = tracer.getCurrentContext().createSpan("node.new_session")) {246 Map<String, EventAttributeValue> attributeMap = new HashMap<>();247 attributeMap248 .put(AttributeKey.LOGGER_CLASS.getKey(), EventAttribute.setValue(getClass().getName()));249 attributeMap.put("session.request.capabilities",250 EventAttribute.setValue(sessionRequest.getDesiredCapabilities().toString()));251 attributeMap.put("session.request.downstreamdialect",252 EventAttribute.setValue(sessionRequest.getDownstreamDialects().toString()));253 int currentSessionCount = getCurrentSessionCount();254 span.setAttribute("current.session.count", currentSessionCount);255 attributeMap.put("current.session.count", EventAttribute.setValue(currentSessionCount));256 if (getCurrentSessionCount() >= maxSessionCount) {257 span.setAttribute("error", true);258 span.setStatus(Status.RESOURCE_EXHAUSTED);259 attributeMap.put("max.session.count", EventAttribute.setValue(maxSessionCount));260 span.addEvent("Max session count reached", attributeMap);261 return Either.left(new RetrySessionRequestException("Max session count reached."));262 }263 if (isDraining()) {264 span.setStatus(Status.UNAVAILABLE.withDescription("The node is draining. Cannot accept new sessions."));265 return Either.left(266 new RetrySessionRequestException("The node is draining. Cannot accept new sessions."));267 }268 // Identify possible slots to use as quickly as possible to enable concurrent session starting269 SessionSlot slotToUse = null;270 synchronized (factories) {271 for (SessionSlot factory : factories) {272 if (!factory.isAvailable() || !factory.test(sessionRequest.getDesiredCapabilities())) {273 continue;274 }275 factory.reserve();276 slotToUse = factory;277 break;278 }279 }280 if (slotToUse == null) {281 span.setAttribute("error", true);282 span.setStatus(Status.NOT_FOUND);283 span.addEvent("No slot matched the requested capabilities. ", attributeMap);284 return Either.left(285 new RetrySessionRequestException("No slot matched the requested capabilities."));286 }287 Either<WebDriverException, ActiveSession> possibleSession = slotToUse.apply(sessionRequest);288 if (possibleSession.isRight()) {289 ActiveSession session = possibleSession.right();290 currentSessions.put(session.getId(), slotToUse);291 SessionId sessionId = session.getId();292 Capabilities caps = session.getCapabilities();293 SESSION_ID.accept(span, sessionId);294 CAPABILITIES.accept(span, caps);295 String downstream = session.getDownstreamDialect().toString();296 String upstream = session.getUpstreamDialect().toString();297 String sessionUri = session.getUri().toString();298 span.setAttribute(AttributeKey.DOWNSTREAM_DIALECT.getKey(), downstream);299 span.setAttribute(AttributeKey.UPSTREAM_DIALECT.getKey(), upstream);300 span.setAttribute(AttributeKey.SESSION_URI.getKey(), sessionUri);301 // The session we return has to look like it came from the node, since we might be dealing302 // with a webdriver implementation that only accepts connections from localhost303 Session externalSession = createExternalSession(304 session,305 externalUri,306 slotToUse.isSupportingCdp() || caps.getCapability("se:cdp") != null);307 return Either.right(new CreateSessionResponse(308 externalSession,309 getEncoder(session.getDownstreamDialect()).apply(externalSession)));310 } else {311 slotToUse.release();312 span.setAttribute("error", true);313 span.addEvent("Unable to create session with the driver", attributeMap);314 return Either.left(possibleSession.left());315 }316 }317 }318 @Override319 public boolean isSessionOwner(SessionId id) {320 Require.nonNull("Session ID", id);321 return currentSessions.getIfPresent(id) != null;322 }323 @Override324 public Session getSession(SessionId id) throws NoSuchSessionException {325 Require.nonNull("Session ID", id);326 SessionSlot slot = currentSessions.getIfPresent(id);327 if (slot == null) {328 throw new NoSuchSessionException("Cannot find session with id: " + id);329 }330 return createExternalSession(slot.getSession(), externalUri, slot.isSupportingCdp());331 }332 @Override333 public TemporaryFilesystem getTemporaryFilesystem(SessionId id) throws IOException {334 try {335 return tempFileSystems.get(id, () -> TemporaryFilesystem.getTmpFsBasedOn(336 TemporaryFilesystem.getDefaultTmpFS().createTempDir("session", id.toString())));337 } catch (ExecutionException e) {338 throw new IOException(e);339 }340 }341 @Override342 public HttpResponse executeWebDriverCommand(HttpRequest req) {343 // True enough to be good enough344 SessionId id = getSessionId(req.getUri()).map(SessionId::new)345 .orElseThrow(() -> new NoSuchSessionException("Cannot find session: " + req));346 SessionSlot slot = currentSessions.getIfPresent(id);347 if (slot == null) {348 throw new NoSuchSessionException("Cannot find session with id: " + id);349 }350 HttpResponse toReturn = slot.execute(req);351 if (req.getMethod() == DELETE && req.getUri().equals("/session/" + id)) {352 stop(id);353 }354 return toReturn;355 }356 @Override357 public HttpResponse uploadFile(HttpRequest req, SessionId id) {358 Map<String, Object> incoming = JSON.toType(string(req), Json.MAP_TYPE);359 File tempDir;360 try {361 TemporaryFilesystem tempfs = getTemporaryFilesystem(id);362 tempDir = tempfs.createTempDir("upload", "file");363 Zip.unzip((String) incoming.get("file"), tempDir);364 } catch (IOException e) {365 throw new UncheckedIOException(e);366 }367 // Select the first file368 File[] allFiles = tempDir.listFiles();369 if (allFiles == null) {370 throw new WebDriverException(371 String.format("Cannot access temporary directory for uploaded files %s", tempDir));372 }373 if (allFiles.length != 1) {374 throw new WebDriverException(375 String.format("Expected there to be only 1 file. There were: %s", allFiles.length));376 }377 ImmutableMap<String, Object> result = ImmutableMap.of(378 "value", allFiles[0].getAbsolutePath());379 return new HttpResponse().setContent(asJson(result));380 }381 @Override382 public void stop(SessionId id) throws NoSuchSessionException {383 Require.nonNull("Session ID", id);384 SessionSlot slot = currentSessions.getIfPresent(id);385 if (slot == null) {386 throw new NoSuchSessionException("Cannot find session with id: " + id);387 }388 killSession(slot);389 tempFileSystems.invalidate(id);390 }391 private Session createExternalSession(ActiveSession other, URI externalUri, boolean isSupportingCdp) {392 Capabilities toUse = ImmutableCapabilities.copyOf(other.getCapabilities());393 // Rewrite the se:options if necessary to send the cdp url back394 if (isSupportingCdp) {395 String cdpPath = String.format("/session/%s/se/cdp", other.getId());396 toUse = new PersistentCapabilities(toUse).setCapability("se:cdp", rewrite(cdpPath));397 }398 return new Session(other.getId(), externalUri, other.getStereotype(), toUse, Instant.now());399 }400 private URI rewrite(String path) {401 try {402 return new URI(403 "ws",404 gridUri.getUserInfo(),405 gridUri.getHost(),406 gridUri.getPort(),407 path,408 null,409 null);410 } catch (URISyntaxException e) {411 throw new RuntimeException(e);412 }413 }414 private void killSession(SessionSlot slot) {415 currentSessions.invalidate(slot.getSession().getId());416 // Attempt to stop the session417 if (!slot.isAvailable()) {418 slot.stop();419 }420 }421 @Override422 public NodeStatus getStatus() {423 Set<Slot> slots = factories.stream()424 .map(slot -> {425 Instant lastStarted = Instant.EPOCH;426 Optional<Session> session = Optional.empty();427 if (!slot.isAvailable()) {428 ActiveSession activeSession = slot.getSession();429 if (activeSession != null) {430 lastStarted = activeSession.getStartTime();431 session = Optional.of(432 new Session(433 activeSession.getId(),434 activeSession.getUri(),435 slot.getStereotype(),436 activeSession.getCapabilities(),437 activeSession.getStartTime()));438 }439 }440 return new Slot(441 new SlotId(getId(), slot.getId()),442 slot.getStereotype(),443 lastStarted,444 session);445 })446 .collect(toImmutableSet());447 return new NodeStatus(448 getId(),449 externalUri,450 maxSessionCount,451 slots,452 isDraining() ? DRAINING : UP,453 heartbeatPeriod,454 getNodeVersion(),455 getOsInfo());456 }457 @Override458 public HealthCheck getHealthCheck() {459 return healthCheck;460 }461 @Override462 public void drain() {463 bus.fire(new NodeDrainStarted(getId()));464 draining = true;465 int currentSessionCount = getCurrentSessionCount();466 if (currentSessionCount == 0) {467 LOG.info("Firing node drain complete message");468 bus.fire(new NodeDrainComplete(getId()));469 } else {470 pendingSessions.set(currentSessionCount);471 }472 }473 private Map<String, Object> toJson() {474 return ImmutableMap.of(475 "id", getId(),476 "uri", externalUri,477 "maxSessions", maxSessionCount,478 "draining", isDraining(),479 "capabilities", factories.stream()480 .map(SessionSlot::getStereotype)481 .collect(Collectors.toSet()));482 }483 public static class Builder {484 private final Tracer tracer;485 private final EventBus bus;486 private final URI uri;487 private final URI gridUri;488 private final Secret registrationSecret;489 private final ImmutableList.Builder<SessionSlot> factories;490 private int maxCount = NodeOptions.DEFAULT_MAX_SESSIONS;491 private Ticker ticker = Ticker.systemTicker();492 private Duration sessionTimeout = Duration.ofSeconds(NodeOptions.DEFAULT_SESSION_TIMEOUT);...
Source:OneShotNode.java
...69import static org.openqa.selenium.grid.data.Availability.UP;70import static org.openqa.selenium.json.Json.MAP_TYPE;71import static org.openqa.selenium.remote.http.HttpMethod.DELETE;72/**73 * An implementation of {@link Node} that marks itself as draining immediately74 * after starting, and which then shuts down after usage. This will allow an75 * appropriately configured Kubernetes cluster to start a new node once the76 * session is finished.77 */78public class OneShotNode extends Node {79 private static final Logger LOG = Logger.getLogger(OneShotNode.class.getName());80 private static final Json JSON = new Json();81 private final EventBus events;82 private final WebDriverInfo driverInfo;83 private final Capabilities stereotype;84 private final URI gridUri;85 private final UUID slotId = UUID.randomUUID();86 private RemoteWebDriver driver;87 private SessionId sessionId;88 private HttpClient client;89 private Capabilities capabilities;90 private Instant sessionStart = Instant.EPOCH;91 private OneShotNode(92 Tracer tracer,93 EventBus events,94 Secret registrationSecret,95 NodeId id,96 URI uri,97 URI gridUri,98 Capabilities stereotype,99 WebDriverInfo driverInfo) {100 super(tracer, id, uri, registrationSecret);101 this.events = Require.nonNull("Event bus", events);102 this.gridUri = Require.nonNull("Public Grid URI", gridUri);103 this.stereotype = ImmutableCapabilities.copyOf(Require.nonNull("Stereotype", stereotype));104 this.driverInfo = Require.nonNull("Driver info", driverInfo);105 }106 public static Node create(Config config) {107 LoggingOptions loggingOptions = new LoggingOptions(config);108 EventBusOptions eventOptions = new EventBusOptions(config);109 BaseServerOptions serverOptions = new BaseServerOptions(config);110 NodeOptions nodeOptions = new NodeOptions(config);111 Map<String, Object> raw = new Json().toType(112 config.get("k8s", "stereotype")113 .orElseThrow(() -> new ConfigException("Unable to find node stereotype")),114 MAP_TYPE);115 Capabilities stereotype = new ImmutableCapabilities(raw);116 Optional<String> driverName = config.get("k8s", "driver_name").map(String::toLowerCase);117 // Find the webdriver info corresponding to the driver name118 WebDriverInfo driverInfo = StreamSupport.stream(ServiceLoader.load(WebDriverInfo.class).spliterator(), false)119 .filter(info -> info.isSupporting(stereotype))120 .filter(info -> driverName.map(name -> name.equals(info.getDisplayName().toLowerCase())).orElse(true))121 .findFirst()122 .orElseThrow(() -> new ConfigException(123 "Unable to find matching driver for %s and %s", stereotype, driverName.orElse("any driver")));124 LOG.info(String.format("Creating one-shot node for %s with stereotype %s", driverInfo, stereotype));125 LOG.info("Grid URI is: " + nodeOptions.getPublicGridUri());126 return new OneShotNode(127 loggingOptions.getTracer(),128 eventOptions.getEventBus(),129 serverOptions.getRegistrationSecret(),130 new NodeId(UUID.randomUUID()),131 serverOptions.getExternalUri(),132 nodeOptions.getPublicGridUri().orElseThrow(() -> new ConfigException("Unable to determine public grid address")),133 stereotype,134 driverInfo);135 }136 @Override137 public Optional<CreateSessionResponse> newSession(CreateSessionRequest sessionRequest) {138 if (driver != null) {139 throw new IllegalStateException("Only expected one session at a time");140 }141 Optional<WebDriver> driver = driverInfo.createDriver(sessionRequest.getCapabilities());142 if (!driver.isPresent()) {143 return Optional.empty();144 }145 if (!(driver.get() instanceof RemoteWebDriver)) {146 driver.get().quit();147 return Optional.empty();148 }149 this.driver = (RemoteWebDriver) driver.get();150 this.sessionId = this.driver.getSessionId();151 this.client = extractHttpClient(this.driver);152 this.capabilities = rewriteCapabilities(this.driver);153 this.sessionStart = Instant.now();154 LOG.info("Encoded response: " + JSON.toJson(ImmutableMap.of(155 "value", ImmutableMap.of(156 "sessionId", sessionId,157 "capabilities", capabilities))));158 events.fire(new NodeDrainStarted(getId()));159 return Optional.of(160 new CreateSessionResponse(161 getSession(sessionId),162 JSON.toJson(ImmutableMap.of(163 "value", ImmutableMap.of(164 "sessionId", sessionId,165 "capabilities", capabilities))).getBytes(UTF_8)));166 }167 private HttpClient extractHttpClient(RemoteWebDriver driver) {168 CommandExecutor executor = driver.getCommandExecutor();169 try {170 Field client = null;171 Class<?> current = executor.getClass();172 while (client == null && (current != null || Object.class.equals(current))) {173 client = findClientField(current);174 current = current.getSuperclass();175 }176 if (client == null) {177 throw new IllegalStateException("Unable to find client field in " + executor.getClass());178 }179 if (!HttpClient.class.isAssignableFrom(client.getType())) {180 throw new IllegalStateException("Client field is not assignable to http client");181 }182 client.setAccessible(true);183 return (HttpClient) client.get(executor);184 } catch (ReflectiveOperationException e) {185 throw new IllegalStateException(e);186 }187 }188 private Field findClientField(Class<?> clazz) {189 try {190 return clazz.getDeclaredField("client");191 } catch (NoSuchFieldException e) {192 return null;193 }194 }195 private Capabilities rewriteCapabilities(RemoteWebDriver driver) {196 // Rewrite the se:options if necessary197 Object rawSeleniumOptions = driver.getCapabilities().getCapability("se:options");198 if (rawSeleniumOptions == null || rawSeleniumOptions instanceof Map) {199 @SuppressWarnings("unchecked") Map<String, Object> original = (Map<String, Object>) rawSeleniumOptions;200 Map<String, Object> updated = new TreeMap<>(original == null ? new HashMap<>() : original);201 String cdpPath = String.format("/session/%s/se/cdp", driver.getSessionId());202 updated.put("cdp", rewrite(cdpPath));203 return new PersistentCapabilities(driver.getCapabilities()).setCapability("se:options", updated);204 }205 return ImmutableCapabilities.copyOf(driver.getCapabilities());206 }207 private URI rewrite(String path) {208 try {209 return new URI(210 gridUri.getScheme(),211 gridUri.getUserInfo(),212 gridUri.getHost(),213 gridUri.getPort(),214 path,215 null,216 null);217 } catch (URISyntaxException e) {218 throw new RuntimeException(e);219 }220 }221 @Override222 public HttpResponse executeWebDriverCommand(HttpRequest req) {223 LOG.info("Executing " + req);224 HttpResponse res = client.execute(req);225 if (DELETE.equals(req.getMethod()) && req.getUri().equals("/session/" + sessionId)) {226 // Ensure the response is sent before we viciously kill the node227 new Thread(228 () -> {229 try {230 Thread.sleep(500);231 } catch (InterruptedException e) {232 Thread.currentThread().interrupt();233 throw new RuntimeException(e);234 }235 LOG.info("Stopping session: " + sessionId);236 stop(sessionId);237 },238 "Node clean up: " + getId())239 .start();240 }241 return res;242 }243 @Override244 public Session getSession(SessionId id) throws NoSuchSessionException {245 if (!isSessionOwner(id)) {246 throw new NoSuchSessionException("Unable to find session with id: " + id);247 }248 return new Session(249 sessionId,250 getUri(),251 stereotype,252 capabilities,253 sessionStart); }254 @Override255 public HttpResponse uploadFile(HttpRequest req, SessionId id) {256 return null;257 }258 @Override259 public void stop(SessionId id) throws NoSuchSessionException {260 LOG.info("Stop has been called: " + id);261 Require.nonNull("Session ID", id);262 if (!isSessionOwner(id)) {263 throw new NoSuchSessionException("Unable to find session " + id);264 }265 LOG.info("Quitting session " + id);266 try {267 driver.quit();268 } catch (Exception e) {269 // It's possible that the driver has already quit.270 }271 events.fire(new SessionClosedEvent(id));272 LOG.info("Firing node drain complete message");273 events.fire(new NodeDrainComplete(getId()));274 }275 @Override276 public boolean isSessionOwner(SessionId id) {277 return driver != null && sessionId.equals(id);278 }279 @Override280 public boolean isSupporting(Capabilities capabilities) {281 return driverInfo.isSupporting(capabilities);282 }283 @Override284 public NodeStatus getStatus() {285 return new NodeStatus(286 getId(),287 getUri(),288 1,289 ImmutableSet.of(290 new Slot(291 new SlotId(getId(), slotId),292 stereotype,293 Instant.EPOCH,294 driver == null ?295 Optional.empty() :296 Optional.of(new Session(sessionId, getUri(), stereotype, capabilities, Instant.now())))),297 isDraining() ? DRAINING : UP);298 }299 @Override300 public void drain() {301 events.fire(new NodeDrainStarted(getId()));302 draining = true;303 }304 @Override305 public HealthCheck getHealthCheck() {306 return () -> new HealthCheck.Result(isDraining() ? DRAINING : UP, "Everything is fine");307 }308 @Override309 public boolean isReady() {310 return events.isReady();311 }312}...
Source:NodeServer.java
1// Licensed to the Software Freedom Conservancy (SFC) under one2// or more contributor license agreements. See the NOTICE file3// distributed with this work for additional information4// regarding copyright ownership. The SFC licenses this file5// to you under the Apache License, Version 2.0 (the6// "License"); you may not use this file except in compliance7// with the License. You may obtain a copy of the License at8//9// http://www.apache.org/licenses/LICENSE-2.010//11// Unless required by applicable law or agreed to in writing,12// software distributed under the License is distributed on an13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY14// KIND, either express or implied. See the License for the15// specific language governing permissions and limitations16// under the License.17package org.openqa.selenium.grid.node.httpd;18import com.google.auto.service.AutoService;19import com.google.common.collect.ImmutableSet;20import com.google.common.net.MediaType;21import net.jodah.failsafe.Failsafe;22import net.jodah.failsafe.RetryPolicy;23import org.openqa.selenium.BuildInfo;24import org.openqa.selenium.cli.CliCommand;25import org.openqa.selenium.events.EventBus;26import org.openqa.selenium.grid.TemplateGridCommand;27import org.openqa.selenium.grid.config.Config;28import org.openqa.selenium.grid.config.Role;29import org.openqa.selenium.grid.data.NodeAddedEvent;30import org.openqa.selenium.grid.data.NodeDrainComplete;31import org.openqa.selenium.grid.data.NodeStatusEvent;32import org.openqa.selenium.grid.log.LoggingOptions;33import org.openqa.selenium.grid.node.HealthCheck;34import org.openqa.selenium.grid.node.Node;35import org.openqa.selenium.grid.node.ProxyNodeCdp;36import org.openqa.selenium.grid.node.config.NodeOptions;37import org.openqa.selenium.grid.server.BaseServerOptions;38import org.openqa.selenium.grid.server.EventBusOptions;39import org.openqa.selenium.grid.server.NetworkOptions;40import org.openqa.selenium.grid.server.Server;41import org.openqa.selenium.netty.server.NettyServer;42import org.openqa.selenium.remote.http.Contents;43import org.openqa.selenium.remote.http.HttpClient;44import org.openqa.selenium.remote.http.HttpHandler;45import org.openqa.selenium.remote.http.HttpResponse;46import org.openqa.selenium.remote.http.Route;47import org.openqa.selenium.remote.tracing.Tracer;48import java.time.Duration;49import java.time.temporal.ChronoUnit;50import java.util.Collections;51import java.util.Set;52import java.util.concurrent.Executors;53import java.util.logging.Logger;54import static java.net.HttpURLConnection.HTTP_INTERNAL_ERROR;55import static java.net.HttpURLConnection.HTTP_NO_CONTENT;56import static org.openqa.selenium.grid.config.StandardGridRoles.EVENT_BUS_ROLE;57import static org.openqa.selenium.grid.config.StandardGridRoles.HTTPD_ROLE;58import static org.openqa.selenium.grid.config.StandardGridRoles.NODE_ROLE;59import static org.openqa.selenium.grid.data.Availability.DOWN;60import static org.openqa.selenium.remote.http.Route.get;61@AutoService(CliCommand.class)62public class NodeServer extends TemplateGridCommand {63 private static final Logger LOG = Logger.getLogger(NodeServer.class.getName());64 @Override65 public String getName() {66 return "node";67 }68 @Override69 public String getDescription() {70 return "Adds this server as a node in the selenium grid.";71 }72 @Override73 public Set<Role> getConfigurableRoles() {74 return ImmutableSet.of(EVENT_BUS_ROLE, HTTPD_ROLE, NODE_ROLE);75 }76 @Override77 public Set<Object> getFlagObjects() {78 return Collections.emptySet();79 }80 @Override81 protected String getSystemPropertiesConfigPrefix() {82 return "node";83 }84 @Override85 protected Config getDefaultConfig() {86 return new DefaultNodeConfig();87 }88 @Override89 protected void execute(Config config) {90 LoggingOptions loggingOptions = new LoggingOptions(config);91 Tracer tracer = loggingOptions.getTracer();92 EventBusOptions events = new EventBusOptions(config);93 EventBus bus = events.getEventBus();94 NetworkOptions networkOptions = new NetworkOptions(config);95 HttpClient.Factory clientFactory = networkOptions.getHttpClientFactory(tracer);96 BaseServerOptions serverOptions = new BaseServerOptions(config);97 LOG.info("Reporting self as: " + serverOptions.getExternalUri());98 NodeOptions nodeOptions = new NodeOptions(config);99 Node node = nodeOptions.getNode();100 HttpHandler readinessCheck = req -> {101 if (node.getStatus().hasCapacity()) {102 return new HttpResponse()103 .setStatus(HTTP_NO_CONTENT);104 }105 return new HttpResponse()106 .setStatus(HTTP_INTERNAL_ERROR)107 .setHeader("Content-Type", MediaType.PLAIN_TEXT_UTF_8.toString())108 .setContent(Contents.utf8String("No capacity available"));109 };110 bus.addListener(NodeAddedEvent.listener(nodeId -> {111 if (node.getId().equals(nodeId)) {112 LOG.info("Node has been added");113 }114 }));115 bus.addListener(NodeDrainComplete.listener(nodeId -> {116 if (!node.getId().equals(nodeId)) {117 return;118 }119 // Wait a beat before shutting down so the final response from the120 // node can escape.121 new Thread(122 () -> {123 try {124 Thread.sleep(1000);125 } catch (InterruptedException e) {126 // Swallow, the next thing we're doing is shutting down127 }128 LOG.info("Shutting down");129 System.exit(0);130 },131 "Node shutdown: " + nodeId)132 .start();133 }));134 Route httpHandler = Route.combine(135 node,136 get("/readyz").to(() -> readinessCheck));137 Server<?> server = new NettyServer(serverOptions, httpHandler, new ProxyNodeCdp(clientFactory, node));138 server.start();139 BuildInfo info = new BuildInfo();140 LOG.info(String.format(141 "Started Selenium node %s (revision %s): %s",142 info.getReleaseLabel(),143 info.getBuildRevision(),144 server.getUrl()));145 // Unlimited attempts, initial 5 seconds interval, backoff rate of 1.0005, max interval of 5 minutes146 RetryPolicy<Object> registrationPolicy = new RetryPolicy<>()147 .withMaxAttempts(-1)148 .handleResultIf(result -> true)149 .withBackoff(Duration.ofSeconds(5).getSeconds(), Duration.ofMinutes(5).getSeconds(), ChronoUnit.SECONDS, 1.0005);150 LOG.info("Starting registration process for node id " + node.getId());151 Executors.newSingleThreadExecutor().submit(() -> {152 Failsafe.with(registrationPolicy).run(153 () -> {154 LOG.fine("Sending registration event");155 HealthCheck.Result check = node.getHealthCheck().check();156 if (DOWN.equals(check.getAvailability())) {157 LOG.severe("Node is not alive: " + check.getMessage());158 // Throw an exception to force another check sooner.159 throw new UnsupportedOperationException("Node cannot be registered");160 }161 bus.fire(new NodeStatusEvent(node.getStatus()));162 }163 );164 });165 }166}...
drain
Using AI Code Generation
1public void drain() {2 this.sessions.forEach((id, session) -> {3 try {4 session.stop();5 } catch (Exception e) {6 LOG.log(Level.SEVERE, "Error stopping session " + id, e);7 }8 });9}10public void stop() {11 this.events.fire(new SessionClosedEvent(this.id));12 this.events.fire(new SessionDeletedEvent(this.id));13 this.events.fire(new SessionTerminatedEvent(this.id));14}15public void fire(SessionEvent event) {16 this.listeners.forEach(listener -> listener.onEvent(event));17}18public interface SessionListener {19 void onEvent(SessionEvent event);20}21public abstract class SessionEvent {22 private final SessionId id;23 public SessionEvent(SessionId id) {24 this.id = id;25 }26 public SessionId getId() {27 return this.id;28 }29}30public class SessionClosedEvent extends SessionEvent {31 public SessionClosedEvent(SessionId id) {32 super(id);33 }34}35public class SessionDeletedEvent extends SessionEvent {36 public SessionDeletedEvent(SessionId id) {37 super(id);38 }39}40public class SessionTerminatedEvent extends SessionEvent {41 public SessionTerminatedEvent(SessionId id) {42 super(id);43 }44}45public class SessionId {46 private final String id;47 public SessionId(String id) {48 this.id = id;49 }50 public String toString() {51 return this.id;52 }53}54public class NodeEvents {55 private final List<NodeListener> listeners;56 public NodeEvents() {57 this.listeners = new CopyOnWriteArrayList<>();58 }59 public void add(NodeListener listener) {60 this.listeners.add(listener);61 }62 public void remove(NodeListener listener) {63 this.listeners.remove(listener);64 }65 public void fire(NodeEvent event) {66 this.listeners.forEach(listener -> listener.onEvent(event));67 }68}69public interface NodeListener {70 void onEvent(NodeEvent event);71}72public abstract class NodeEvent {73 private final NodeId id;74 public NodeEvent(NodeId id) {75 this.id = id;
drain
Using AI Code Generation
1 private void drain() {2 ExecutorService executor = Executors.newFixedThreadPool(1);3 Future<?> future = executor.submit(() -> {4 Thread.sleep(5000);5 return "Callable task completed.";6 });7 executor.shutdown();8 while (!future.isDone()) {9 Thread.sleep(1000);10 logger.info("Waiting for the callable task to complete...");11 }12 logger.info("Callable task completed.");13 }14 private void drain() {15 ExecutorService executor = Executors.newFixedThreadPool(1);16 Future<?> future = executor.submit(() -> {17 Thread.sleep(5000);18 return "Callable task completed.";19 });20 executor.shutdown();21 while (!future.isDone()) {22 Thread.sleep(1000);23 logger.info("Waiting for the callable task to complete...");24 }25 logger.info("Callable task completed.");26 }27 private void drain() {28 ExecutorService executor = Executors.newFixedThreadPool(1);29 Future<?> future = executor.submit(() -> {30 Thread.sleep(5000);31 return "Callable task completed.";32 });33 executor.shutdown();34 while (!future.isDone()) {35 Thread.sleep(1000);
drain
Using AI Code Generation
1import org.openqa.selenium.grid.node.Node;2node.drain();3import org.openqa.selenium.grid.node.Node;4node.undrain();5import org.openqa.selenium.grid.node.Node;6node.drain();7import org.openqa.selenium.grid.node.Node;8node.undrain();9import org.openqa.selenium.grid.node.Node;10node.drain();11import org.openqa.selenium.grid.node.Node;12node.undrain();13import org.openqa.selenium.grid.node.Node;14node.drain();15import org.openqa.selenium.grid.node.Node;16node.undrain();17import org.openqa.selenium.grid.node.Node;
drain
Using AI Code Generation
1public void drain() throws IOException2package org.openqa.selenium.grid.node; 3import java.io.IOException; 4public class Node { 5public void drain() throws IOException { 6} 7}8public void drain() throws IOException9package org.openqa.selenium.grid.node; 10import java.io.IOException; 11public class Node { 12public void drain() throws IOException { 13} 14}15public NodeId get()16package org.openqa.selenium.grid.node; 17public class Node { 18public NodeId get() { 19return null; 20} 21}
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