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How to use add method of org.openqa.selenium.grid.distributor.Distributor class

Best Selenium code snippet using org.openqa.selenium.grid.distributor.Distributor.add

Source:Host.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.distributor.local;18import static java.util.stream.Collectors.groupingBy;19import static java.util.stream.Collectors.summingInt;20import static org.openqa.selenium.grid.data.SessionClosedEvent.SESSION_CLOSED;21import static org.openqa.selenium.grid.distributor.local.Host.Status.DOWN;22import static org.openqa.selenium.grid.distributor.local.Host.Status.DRAINING;23import static org.openqa.selenium.grid.distributor.local.Host.Status.UP;24import static org.openqa.selenium.grid.distributor.local.Slot.Status.ACTIVE;25import static org.openqa.selenium.grid.distributor.local.Slot.Status.AVAILABLE;26import com.google.common.annotations.VisibleForTesting;27import com.google.common.collect.ImmutableList;28import org.openqa.selenium.Capabilities;29import org.openqa.selenium.SessionNotCreatedException;30import org.openqa.selenium.events.EventBus;31import org.openqa.selenium.grid.component.HealthCheck;32import org.openqa.selenium.grid.data.CreateSessionRequest;33import org.openqa.selenium.grid.data.CreateSessionResponse;34import org.openqa.selenium.grid.data.DistributorStatus;35import org.openqa.selenium.grid.data.NodeStatus;36import org.openqa.selenium.grid.node.Node;37import org.openqa.selenium.remote.SessionId;38import java.net.URI;39import java.util.HashMap;40import java.util.List;41import java.util.Map;42import java.util.Objects;43import java.util.Set;44import java.util.UUID;45import java.util.concurrent.locks.Lock;46import java.util.concurrent.locks.ReadWriteLock;47import java.util.concurrent.locks.ReentrantReadWriteLock;48import java.util.function.Supplier;49import java.util.logging.Logger;50class Host {51  private static final Logger LOG = Logger.getLogger("Selenium Distributor");52  private final Node node;53  private final UUID nodeId;54  private final URI uri;55  private final Runnable performHealthCheck;56  // Used any time we need to read or modify the mutable state of this host57  private final ReadWriteLock lock = new ReentrantReadWriteLock(/* fair */ true);58  private Status status;59  private List<Slot> slots;60  private int maxSessionCount;61  public Host(EventBus bus, Node node) {62    this.node = Objects.requireNonNull(node);63    this.nodeId = node.getId();64    this.uri = node.getUri();65    this.status = Status.DOWN;66    this.slots = ImmutableList.of();67    HealthCheck healthCheck = node.getHealthCheck();68    this.performHealthCheck = () -> {69      HealthCheck.Result result = healthCheck.check();70      Host.Status current = result.isAlive() ? UP : DOWN;71      Host.Status previous = setHostStatus(current);72      if (previous == DRAINING) {73        // We want to continue to allow the node to drain.74        setHostStatus(DRAINING);75        return;76      }77      if (current != previous) {78        LOG.info(String.format(79            "Changing status of node %s from %s to %s. Reason: %s",80            node.getId(),81            previous,82            current,83            result.getMessage()));84      }85    };86    bus.addListener(SESSION_CLOSED, event -> {87      SessionId id = event.getData(SessionId.class);88      this.slots.forEach(slot -> slot.onEnd(id));89    });90    update(node.getStatus());91  }92  void update(NodeStatus status) {93    Objects.requireNonNull(status);94    Lock writeLock = lock.writeLock();95    writeLock.lock();96    try {97      // This is grossly inefficient. But we're on a modern processor and we're expecting 10s to 100s98      // of nodes, so this is probably ok.99      Set<NodeStatus.Active> sessions = status.getCurrentSessions();100      Map<Capabilities, Integer> actives = sessions.parallelStream().collect(101          groupingBy(NodeStatus.Active::getStereotype, summingInt(active -> 1)));102      ImmutableList.Builder<Slot> slots = ImmutableList.builder();103      status.getStereotypes().forEach((caps, count) -> {104        if (actives.containsKey(caps)) {105          Integer activeCount = actives.get(caps);106          for (int i = 0; i < activeCount; i++) {107            slots.add(new Slot(node, caps, ACTIVE));108          }109          count -= activeCount;110        }111        for (int i = 0; i < count; i++) {112          slots.add(new Slot(node, caps, AVAILABLE));113        }114      });115      this.slots = slots.build();116      // By definition, we can never have more sessions than we have slots available117      this.maxSessionCount = Math.min(this.slots.size(), status.getMaxSessionCount());118    } finally {119      writeLock.unlock();120    }121  }122  public UUID getId() {123    return nodeId;124  }125  public DistributorStatus.NodeSummary asSummary() {126    Map<Capabilities, Integer> stereotypes = new HashMap<>();...

Source:LocalDistributor.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.distributor.local;18import static com.google.common.collect.ImmutableList.toImmutableList;19import static org.openqa.selenium.grid.distributor.local.Host.Status.DOWN;20import static org.openqa.selenium.grid.distributor.local.Host.Status.DRAINING;21import static org.openqa.selenium.grid.distributor.local.Host.Status.UP;22import com.google.common.annotations.VisibleForTesting;23import com.google.common.collect.ImmutableList;24import org.openqa.selenium.Beta;25import org.openqa.selenium.Capabilities;26import org.openqa.selenium.SessionNotCreatedException;27import org.openqa.selenium.concurrent.Regularly;28import org.openqa.selenium.grid.component.HealthCheck;29import org.openqa.selenium.grid.data.Session;30import org.openqa.selenium.grid.distributor.Distributor;31import org.openqa.selenium.grid.distributor.DistributorStatus;32import org.openqa.selenium.grid.node.Node;33import org.openqa.selenium.grid.node.NodeStatus;34import org.openqa.selenium.json.Json;35import org.openqa.selenium.json.JsonOutput;36import org.openqa.selenium.remote.NewSessionPayload;37import org.openqa.selenium.remote.http.HttpClient;38import org.openqa.selenium.remote.tracing.DistributedTracer;39import org.openqa.selenium.remote.tracing.Span;40import java.time.Duration;41import java.util.ArrayList;42import java.util.Collection;43import java.util.Comparator;44import java.util.HashSet;45import java.util.Iterator;46import java.util.Map;47import java.util.Objects;48import java.util.Optional;49import java.util.Set;50import java.util.UUID;51import java.util.concurrent.ConcurrentHashMap;52import java.util.concurrent.locks.Lock;53import java.util.concurrent.locks.ReadWriteLock;54import java.util.concurrent.locks.ReentrantReadWriteLock;55import java.util.function.Supplier;56import java.util.logging.Logger;57public class LocalDistributor extends Distributor {58  private static final Json JSON = new Json();59  private static final Logger LOG = Logger.getLogger("Selenium Distributor");60  private final ReadWriteLock lock = new ReentrantReadWriteLock(/* fair */ true);61  private final Set<Host> hosts = new HashSet<>();62  private final DistributedTracer tracer;63  private final Regularly hostChecker = new Regularly("distributor host checker");64  private final Map<UUID, Collection<Runnable>> allChecks = new ConcurrentHashMap<>();65  public LocalDistributor(DistributedTracer tracer, HttpClient.Factory httpClientFactory) {66    super(tracer, httpClientFactory);67    this.tracer = Objects.requireNonNull(tracer);68  }69  @Override70  public Session newSession(NewSessionPayload payload) throws SessionNotCreatedException {71    Iterator<Capabilities> allCaps = payload.stream().iterator();72    if (!allCaps.hasNext()) {73      throw new SessionNotCreatedException("No capabilities found");74    }75    Capabilities caps = allCaps.next();76    Optional<Supplier<Session>> selected;77    Lock writeLock = this.lock.writeLock();78    writeLock.lock();79    try {80      selected = this.hosts.stream()81          .filter(host -> host.getHostStatus() == UP)82          // Find a host that supports this kind of thing83          .filter(host -> host.hasCapacity(caps))84          .min(85              // Now sort by node which has the lowest load (natural ordering)86              Comparator.comparingDouble(Host::getLoad)87                  // Then last session created (oldest first), so natural ordering again88                  .thenComparingLong(Host::getLastSessionCreated)89                  // And use the host id as a tie-breaker.90                  .thenComparing(Host::getId))91          // And reserve some space92          .map(host -> host.reserve(caps));93    } finally {94      writeLock.unlock();95    }96    return selected97        .orElseThrow(98            () -> new SessionNotCreatedException("Unable to find provider for session: " + allCaps))99        .get();100  }101  @Override102  public LocalDistributor add(Node node) {103    StringBuilder sb = new StringBuilder();104    Lock writeLock = this.lock.writeLock();105    writeLock.lock();106    try (Span span = tracer.createSpan("distributor.add", tracer.getActiveSpan());107         JsonOutput out = JSON.newOutput(sb)) {108      out.setPrettyPrint(false).write(node);109      span.addTag("node", sb.toString());110      // TODO: We should check to see what happens for duplicate nodes.111      Host host = new Host(node);112      hosts.add(host);113      LOG.info(String.format("Added node %s.", node.getId()));114      host.refresh();115      Runnable runnable = host::refresh;116      Collection<Runnable> nodeRunnables = allChecks.getOrDefault(node.getId(), new ArrayList<>());117      nodeRunnables.add(runnable);118      allChecks.put(node.getId(), nodeRunnables);119      hostChecker.submit(runnable, Duration.ofMinutes(5), Duration.ofSeconds(30));120    } finally {121      writeLock.unlock();122    }123    return this;124  }125  @Override126  public void remove(UUID nodeId) {127    Lock writeLock = lock.writeLock();128    writeLock.lock();129    try (Span span = tracer.createSpan("distributor.remove", tracer.getActiveSpan())) {130      span.addTag("node.id", nodeId);131      hosts.removeIf(host -> nodeId.equals(host.getId()));132      allChecks.getOrDefault(nodeId, new ArrayList<>()).forEach(hostChecker::remove);133    } finally {134      writeLock.unlock();135    }136  }137  @Override138  public DistributorStatus getStatus() {139    Lock readLock = this.lock.readLock();140    readLock.lock();141    try {142      ImmutableList<NodeStatus> nodesStatuses = this.hosts.stream()143          .map(Host::getStatus)144          .collect(toImmutableList());...

Source:DistributorServer.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.distributor.httpd;18import com.google.auto.service.AutoService;19import com.beust.jcommander.JCommander;20import com.beust.jcommander.ParameterException;21import org.openqa.selenium.cli.CliCommand;22import org.openqa.selenium.events.EventBus;23import org.openqa.selenium.grid.config.AnnotatedConfig;24import org.openqa.selenium.grid.config.CompoundConfig;25import org.openqa.selenium.grid.config.ConcatenatingConfig;26import org.openqa.selenium.grid.config.Config;27import org.openqa.selenium.grid.config.EnvConfig;28import org.openqa.selenium.grid.distributor.Distributor;29import org.openqa.selenium.grid.distributor.local.LocalDistributor;30import org.openqa.selenium.grid.log.LoggingOptions;31import org.openqa.selenium.grid.server.BaseServer;32import org.openqa.selenium.grid.server.BaseServerFlags;33import org.openqa.selenium.grid.server.BaseServerOptions;34import org.openqa.selenium.grid.server.EventBusConfig;35import org.openqa.selenium.grid.server.EventBusFlags;36import org.openqa.selenium.grid.server.HelpFlags;37import org.openqa.selenium.grid.server.Server;38import org.openqa.selenium.grid.server.W3CCommandHandler;39import org.openqa.selenium.grid.sessionmap.SessionMap;40import org.openqa.selenium.grid.sessionmap.config.SessionMapFlags;41import org.openqa.selenium.grid.sessionmap.config.SessionMapOptions;42import org.openqa.selenium.grid.web.Routes;43import org.openqa.selenium.remote.http.HttpClient;44import org.openqa.selenium.remote.tracing.DistributedTracer;45import org.openqa.selenium.remote.tracing.GlobalDistributedTracer;46@AutoService(CliCommand.class)47public class DistributorServer implements CliCommand {48  @Override49  public String getName() {50    return "distributor";51  }52  @Override53  public String getDescription() {54    return "Adds this server as the distributor in a selenium grid.";55  }56  @Override57  public Executable configure(String... args) {58    HelpFlags help = new HelpFlags();59    BaseServerFlags serverFlags = new BaseServerFlags(5553);60    SessionMapFlags sessionMapFlags = new SessionMapFlags();61    EventBusFlags eventBusFlags = new EventBusFlags();62    JCommander commander = JCommander.newBuilder()63        .programName(getName())64        .addObject(help)65        .addObject(eventBusFlags)66        .addObject(sessionMapFlags)67        .addObject(serverFlags)68        .build();69    return () -> {70      try {71        commander.parse(args);72      } catch (ParameterException e) {73        System.err.println(e.getMessage());74        commander.usage();75        return;76      }77      if (help.displayHelp(commander, System.out)) {78        return;79      }80      Config config = new CompoundConfig(81          new EnvConfig(),82          new ConcatenatingConfig("distributor", '.', System.getProperties()),83          new AnnotatedConfig(help),84          new AnnotatedConfig(eventBusFlags),85          new AnnotatedConfig(serverFlags),86          new AnnotatedConfig(sessionMapFlags),87          new DefaultDistributorConfig());88      LoggingOptions loggingOptions = new LoggingOptions(config);89      loggingOptions.configureLogging();90      DistributedTracer tracer = loggingOptions.getTracer();91      GlobalDistributedTracer.setInstance(tracer);92      EventBusConfig events = new EventBusConfig(config);93      EventBus bus = events.getEventBus();94      HttpClient.Factory clientFactory = HttpClient.Factory.createDefault();95      SessionMap sessions = new SessionMapOptions(config).getSessionMap(clientFactory);96      Distributor distributor = new LocalDistributor(97          tracer,98          bus,99          clientFactory,100          sessions);101      BaseServerOptions serverOptions = new BaseServerOptions(config);102      Server<?> server = new BaseServer<>(serverOptions);103      server.addRoute(104          Routes.matching(distributor).using(distributor).decorateWith(W3CCommandHandler::new));105      server.start();106    };107  }108}...

Source:RouterServer.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.router.httpd;18import com.google.auto.service.AutoService;19import com.beust.jcommander.JCommander;20import com.beust.jcommander.ParameterException;21import org.openqa.selenium.cli.CliCommand;22import org.openqa.selenium.grid.config.AnnotatedConfig;23import org.openqa.selenium.grid.config.CompoundConfig;24import org.openqa.selenium.grid.config.ConcatenatingConfig;25import org.openqa.selenium.grid.config.Config;26import org.openqa.selenium.grid.config.EnvConfig;27import org.openqa.selenium.grid.distributor.Distributor;28import org.openqa.selenium.grid.distributor.config.DistributorFlags;29import org.openqa.selenium.grid.distributor.config.DistributorOptions;30import org.openqa.selenium.grid.log.LoggingOptions;31import org.openqa.selenium.grid.router.Router;32import org.openqa.selenium.grid.server.BaseServer;33import org.openqa.selenium.grid.server.BaseServerFlags;34import org.openqa.selenium.grid.server.BaseServerOptions;35import org.openqa.selenium.grid.server.HelpFlags;36import org.openqa.selenium.grid.server.Server;37import org.openqa.selenium.grid.server.W3CCommandHandler;38import org.openqa.selenium.grid.sessionmap.SessionMap;39import org.openqa.selenium.grid.sessionmap.config.SessionMapFlags;40import org.openqa.selenium.grid.sessionmap.config.SessionMapOptions;41import org.openqa.selenium.grid.web.Routes;42import org.openqa.selenium.remote.http.HttpClient;43import org.openqa.selenium.remote.tracing.DistributedTracer;44import org.openqa.selenium.remote.tracing.GlobalDistributedTracer;45@AutoService(CliCommand.class)46public class RouterServer implements CliCommand {47  @Override48  public String getName() {49    return "router";50  }51  @Override52  public String getDescription() {53    return "Creates a router to front the selenium grid.";54  }55  @Override56  public Executable configure(String... args) {57    HelpFlags help = new HelpFlags();58    BaseServerFlags serverFlags = new BaseServerFlags(4444);59    SessionMapFlags sessionMapFlags = new SessionMapFlags();60    DistributorFlags distributorFlags = new DistributorFlags();61    JCommander commander = JCommander.newBuilder()62        .programName(getName())63        .addObject(help)64        .addObject(serverFlags)65        .addObject(sessionMapFlags)66        .addObject(distributorFlags)67        .build();68    return () -> {69      try {70        commander.parse(args);71      } catch (ParameterException e) {72        System.err.println(e.getMessage());73        commander.usage();74        return;75      }76      if (help.displayHelp(commander, System.out)) {77        return;78      }79      Config config = new CompoundConfig(80          new EnvConfig(),81          new ConcatenatingConfig("router", '.', System.getProperties()),82          new AnnotatedConfig(help),83          new AnnotatedConfig(serverFlags),84          new AnnotatedConfig(sessionMapFlags),85          new AnnotatedConfig(distributorFlags));86      LoggingOptions loggingOptions = new LoggingOptions(config);87      loggingOptions.configureLogging();88      DistributedTracer tracer = loggingOptions.getTracer();89      GlobalDistributedTracer.setInstance(tracer);90      HttpClient.Factory clientFactory = HttpClient.Factory.createDefault();91      SessionMapOptions sessionsOptions = new SessionMapOptions(config);92      SessionMap sessions = sessionsOptions.getSessionMap(clientFactory);93      BaseServerOptions serverOptions = new BaseServerOptions(config);94      DistributorOptions distributorOptions = new DistributorOptions(config);95      Distributor distributor = distributorOptions.getDistributor(tracer, clientFactory);96      Router router = new Router(tracer, clientFactory, sessions, distributor);97      Server<?> server = new BaseServer<>(serverOptions);98      server.addRoute(Routes.matching(router).using(router).decorateWith(W3CCommandHandler::new));99      server.start();100    };101  }102}...

add

Using AI Code Generation

1package org.openqa.selenium.grid.distributor;2import org.openqa.selenium.grid.data.Session;3import org.openqa.selenium.grid.data.SessionRequest;4import org.openqa.selenium.grid.node.Node;5import org.openqa.selenium.grid.node.NodeId;6import org.openqa.selenium.grid.web.Routable;7import org.openqa.selenium.internal.Require;8import org.openqa.selenium.remote.http.Contents;9import org.openqa.selenium.remote.http.HttpHandler;10import org.openqa.selenium.remote.http.HttpRequest;11import org.openqa.selenium.remote.http.HttpResponse;12import java.util.Objects;13import java.util.UUID;14import java.util.function.Predicate;15import java.util.logging.Logger;16public class AddNode implements Routable {17  private static final Logger LOG = Logger.getLogger(AddNode.class.getName());18  private final Distributor distributor;19  public AddNode(Distributor distributor) {20    this.distributor = Require.nonNull("Distributor", distributor);21  }22  public Predicate<HttpRequest> getRoute() {23    return req -> req.getMethod().equals("POST") &&24                  req.getUri().getPath().equals("/se/grid/distributor/node");25  }26  public HttpHandler execute(HttpRequest req) {27    return new HttpHandler() {28      public HttpResponse execute(HttpRequest req) throws Exception {29        Node node = Node.fromJSON(Contents.string(req));30        distributor.add(node);31        return new HttpResponse()32          .setStatus(200);33      }34    };35  }36}37package org.openqa.selenium.grid.distributor;38import org.openqa.selenium.grid.data.Session;39import org.openqa.selenium.grid.data.SessionRequest;40import org.openqa.selenium.grid.node.Node;41import org.openqa.selenium.grid.node.NodeId;42import org.openqa.selenium.grid.web.Routable;43import org.openqa.selenium.internal.Require;44import org.openqa.selenium.remote.http.Contents;45import org.openqa.selenium.remote.http.HttpHandler;46import org.openqa.selenium.remote.http.HttpRequest;47import org.openqa.selenium.remote.http.HttpResponse;48import java.util.Objects;49import java.util.UUID;50import java.util.function.Predicate;51import java.util.logging.Logger;52public class RemoveNode implements Routable {53  private static final Logger LOG = Logger.getLogger(RemoveNode.class.getName());54  private final Distributor distributor;55  public RemoveNode(Distributor distributor) {56    this.distributor = Require.nonNull("Distributor", distributor);57  }58  public Predicate<HttpRequest> getRoute() {59    return req -> req.getMethod().equals

add

Using AI Code Generation

1    public void testDistributorAdd() {2        Distributor distributor = new Distributor();3        distributor.add(null);4    }5    public void testDistributorAdd() {6        Distributor distributor = new Distributor();7        distributor.add(null);8    }9    public void testDistributorAdd() {10        Distributor distributor = new Distributor();11        distributor.add(null);12    }13    public void testDistributorAdd() {14        Distributor distributor = new Distributor();15        distributor.add(null);16    }17    public void testDistributorAdd() {18        Distributor distributor = new Distributor();19        distributor.add(null);20    }21    public void testDistributorAdd() {22        Distributor distributor = new Distributor();23        distributor.add(null);24    }25    public void testDistributorAdd() {26        Distributor distributor = new Distributor();27        distributor.add(null);28    }29    public void testDistributorAdd() {30        Distributor distributor = new Distributor();31        distributor.add(null);32    }33    public void testDistributorAdd() {34        Distributor distributor = new Distributor();35        distributor.add(null);36    }37    public void testDistributorAdd() {38        Distributor distributor = new Distributor();39        distributor.add(null);40    }41    public void testDistributorAdd() {42        Distributor distributor = new Distributor();43        distributor.add(null);44    }

add

Using AI Code Generation

1SessionRequest request = new SessionRequest(2    new SessionId(UUID.randomUUID()),3    new SessionRequest.Capabilities(4        ImmutableMap.of("browserName", "chrome")5);6Distributor distributor = new Distributor();7distributor.add(request);8System.out.println(distributor.size());9System.out.println(distributor.get(request.getId()));10distributor.remove(request.getId());11System.out.println(distributor.size());12System.out.println(distributor.get(request.getId()));

add

Using AI Code Generation

1public static String addSession(Distributor distributor, SessionRequest sessionRequest) {2  if (distributor == null || sessionRequest == null) {3    return null;4  }5  Session session = distributor.add(sessionRequest);6  if (session == null) {7    return null;8  }9  return session.getId().toString();10}11public static boolean removeSession(Distributor distributor, String sessionId) {12  if (distributor == null || sessionId == null) {13    return false;14  }15  distributor.remove(new SessionId(sessionId));16  return true;17}18public static Session getSession(Distributor distributor, String sessionId) {19  if (distributor == null || sessionId == null) {20    return null;21  }22  return distributor.get(new SessionId(sessionId));23}24public static List<Session> getAllSessions(Distributor distributor) {25  if (distributor == null) {26    return null;27  }28  return distributor.getAll();29}30public static List<Session> getActiveSessions(Distributor distributor) {31  if (distributor == null) {32    return null;33  }

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