Examples of org.apache.ambari.server.state.State

org.apache.ambari.server.state.State


    Set<ServiceComponentHostResponse> response =
        new HashSet<ServiceComponentHostResponse>();


    boolean checkDesiredState = false;
    State desiredStateToCheck = null;
    if (request.getDesiredState() != null
        && !request.getDesiredState().isEmpty()) {
      desiredStateToCheck = State.valueOf(request.getDesiredState());
      if (!desiredStateToCheck.isValidDesiredState()) {
        throw new IllegalArgumentException("Invalid arguments, invalid desired"
            + " state, desiredState=" + desiredStateToCheck);
      }
      checkDesiredState = true;
    }

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      for (String compName : changedScHosts.keySet()) {
        for (State newState : changedScHosts.get(compName).keySet()) {
          for (ServiceComponentHost scHost :
              changedScHosts.get(compName).get(newState)) {
            RoleCommand roleCommand;
            State oldSchState = scHost.getState();
            ServiceComponentHostEvent event;
            switch(newState) {
              case INSTALLED:
                if (oldSchState == State.INIT
                    || oldSchState == State.UNINSTALLED
                    || oldSchState == State.INSTALLED
                    || oldSchState == State.INSTALLING
                    || oldSchState == State.INSTALL_FAILED) {
                  roleCommand = RoleCommand.INSTALL;
                  event = new ServiceComponentHostInstallEvent(
                      scHost.getServiceComponentName(), scHost.getHostName(),
                      nowTimestamp,
                      scHost.getDesiredStackVersion().getStackId());
                } else if (oldSchState == State.STARTED
                    || oldSchState == State.START_FAILED
                    || oldSchState == State.INSTALLED
                    || oldSchState == State.STOP_FAILED) {
                  roleCommand = RoleCommand.STOP;
                  event = new ServiceComponentHostStopEvent(
                      scHost.getServiceComponentName(), scHost.getHostName(),
                      nowTimestamp);
                } else {
                  throw new AmbariException("Invalid transition for"
                      + " servicecomponenthost"
                      + ", clusterName=" + cluster.getClusterName()
                      + ", clusterId=" + cluster.getClusterId()
                      + ", serviceName=" + scHost.getServiceName()
                      + ", componentName=" + scHost.getServiceComponentName()
                      + ", hostname=" + scHost.getHostName()
                      + ", currentState=" + oldSchState
                      + ", newDesiredState=" + newState);
                }
                break;
              case STARTED:
                StackId stackId = scHost.getDesiredStackVersion();
                ComponentInfo compInfo = ambariMetaInfo.getComponentCategory(
                    stackId.getStackName(), stackId.getStackVersion(), scHost.getServiceName(),
                    scHost.getServiceComponentName());
                if (oldSchState == State.INSTALLED
                    || oldSchState == State.START_FAILED || oldSchState == State.STARTING) {
                  roleCommand = RoleCommand.START;
                  event = new ServiceComponentHostStartEvent(
                      scHost.getServiceComponentName(), scHost.getHostName(),
                      nowTimestamp, scHost.getDesiredConfigVersionsRecursive());
                } else {
                  String error = "Invalid transition for"
                      + " servicecomponenthost"
                      + ", clusterName=" + cluster.getClusterName()
                      + ", clusterId=" + cluster.getClusterId()
                      + ", serviceName=" + scHost.getServiceName()
                      + ", componentName=" + scHost.getServiceComponentName()
                      + ", hostname=" + scHost.getHostName()
                      + ", currentState=" + oldSchState
                      + ", newDesiredState=" + newState;
                  if (compInfo.isMaster()) {
                    throw new AmbariException(error);
                  } else {
                    LOG.info("Ignoring: " + error);
                    continue;
                  }
                }
                break;
              case UNINSTALLED:
                if (oldSchState == State.INSTALLED
                    || oldSchState == State.UNINSTALL_FAILED) {
                  roleCommand = RoleCommand.UNINSTALL;
                  event = new ServiceComponentHostStartEvent(
                      scHost.getServiceComponentName(), scHost.getHostName(),
                      nowTimestamp, scHost.getDesiredConfigVersionsRecursive());
                } else {
                  throw new AmbariException("Invalid transition for"
                      + " servicecomponenthost"
                      + ", clusterName=" + cluster.getClusterName()
                      + ", clusterId=" + cluster.getClusterId()
                      + ", serviceName=" + scHost.getServiceName()
                      + ", componentName=" + scHost.getServiceComponentName()
                      + ", hostname=" + scHost.getHostName()
                      + ", currentState=" + oldSchState
                      + ", newDesiredState=" + newState);
                }
                break;
              case INIT:
                throw new AmbariException("Unsupported transition to INIT for"
                    + " servicecomponenthost"
                    + ", clusterName=" + cluster.getClusterName()
                    + ", clusterId=" + cluster.getClusterId()
                    + ", serviceName=" + scHost.getServiceName()
                    + ", componentName=" + scHost.getServiceComponentName()
                    + ", hostname=" + scHost.getHostName()
                    + ", currentState=" + oldSchState
                    + ", newDesiredState=" + newState);
              default:
                throw new AmbariException("Unsupported state change operation"
                    + ", newState=" + newState.toString());
            }


            if (LOG.isDebugEnabled()) {
              LOG.debug("Create a new host action"
                  + ", requestId=" + requestId.longValue()
                  + ", componentName=" + scHost.getServiceComponentName()
                  + ", hostname=" + scHost.getHostName()
                  + ", roleCommand=" + roleCommand.name());
            }


            Map<String, Config> configs = scHost.getDesiredConfigs();
            // Clone configurations for the command
            Map<String, Map<String, String>> configurations =
                new TreeMap<String, Map<String, String>>();
            for (Config config : configs.values()) {
              if (LOG.isDebugEnabled()) {
                LOG.debug("Cloning configs for execution command"
                    + ", configType=" + config.getType()
                    + ", configVersionTag=" + config.getVersionTag()
                    + ", clusterName=" + scHost.getClusterName()
                    + ", serviceName=" + scHost.getServiceName()
                    + ", componentName=" + scHost.getServiceComponentName()
                    + ", hostname=" + scHost.getHostName());
              }
              configurations.put(config.getType(),
                  config.getProperties());
            }
            // HACK HACK HACK
            if ((!scHost.getHostName().equals(jobtrackerHost))
                && configurations.get("global") != null) {
              if (LOG.isDebugEnabled()) {
                LOG.debug("Setting rca_enabled to false for host "
                    + scHost.getHostName());
              }
              configurations.get("global").put("rca_enabled", "false");
            }
            createHostAction(cluster, stage, scHost, configurations,
                roleCommand, nowTimestamp, event);
          }
        }
      }


      for (String serviceName : smokeTestServices) {
        Service s = cluster.getService(serviceName);


        // find service component host
        String clientHost = getClientHostForRunningAction(cluster, s);
        String smokeTestRole =
            actionMetadata.getServiceCheckAction(serviceName);


        if (clientHost == null || smokeTestRole == null) {
          LOG.info("Nothing to do for service check as could not find role or"
              + " or host to run check on"
              + ", clusterName=" + cluster.getClusterName()
              + ", serviceName=" + serviceName
              + ", clientHost=" + clientHost
              + ", serviceCheckRole=" + smokeTestRole);
          continue;
        }


        stage.addHostRoleExecutionCommand(clientHost,
            Role.valueOf(smokeTestRole),
            RoleCommand.EXECUTE,
            new ServiceComponentHostOpInProgressEvent(null, clientHost,
                nowTimestamp), cluster.getClusterName(), serviceName);


        Map<String, Map<String, String>> configurations =
            new TreeMap<String, Map<String, String>>();
        Map<String, Config> allConfigs = cluster.getService(serviceName).getDesiredConfigs();
        if (allConfigs != null) {
          for (Map.Entry<String, Config> entry: allConfigs.entrySet()) {
            configurations.put(entry.getValue().getType(), entry.getValue().getProperties());
          }
        }
        
        stage.getExecutionCommandWrapper(clientHost,
            smokeTestRole).getExecutionCommand()
            .setConfigurations(configurations);


        // Generate cluster host info
        stage.getExecutionCommandWrapper(clientHost, smokeTestRole)
            .getExecutionCommand()
            .setClusterHostInfo(StageUtils.getClusterHostInfo(cluster, hostsMap));
      }


      RoleGraph rg = new RoleGraph(rco);
      rg.build(stage);
      stages = rg.getStages();


      if (LOG.isDebugEnabled()) {
        LOG.debug("Triggering Action Manager"
            + ", clusterName=" + cluster.getClusterName()
            + ", requestId=" + requestId.longValue()
            + ", stagesCount=" + stages.size());
      }
      actionManager.sendActions(stages);
    }


    if (changedServices != null) {
      for (Entry<State, List<Service>> entry : changedServices.entrySet()) {
        State newState = entry.getKey();
        for (Service s : entry.getValue()) {
          if (s.isClientOnlyService()
              && newState == State.STARTED) {
            continue;
          }
          s.setDesiredState(newState);
        }
      }
    }


    if (changedComps != null) {
      for (Entry<State, List<ServiceComponent>> entry :
          changedComps.entrySet()){
        State newState = entry.getKey();
        for (ServiceComponent sc : entry.getValue()) {
          sc.setDesiredState(newState);
        }
      }
    }


    for (Map<State, List<ServiceComponentHost>> stateScHostMap :
        changedScHosts.values()) {
      for (Entry<State, List<ServiceComponentHost>> entry :
          stateScHostMap.entrySet()) {
        State newState = entry.getKey();
        for (ServiceComponentHost sch : entry.getValue()) {
          sch.setDesiredState(newState);
        }
      }
    }

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      }
      serviceNames.get(request.getClusterName()).add(request.getServiceName());


      Cluster cluster = clusters.getCluster(request.getClusterName());
      Service s = cluster.getService(request.getServiceName());
      State oldState = s.getDesiredState();
      State newState = null;
      if (request.getDesiredState() != null) {
        newState = State.valueOf(request.getDesiredState());
        if (!newState.isValidDesiredState()) {
          throw new IllegalArgumentException("Invalid arguments, invalid"
              + " desired state, desiredState=" + newState);
        }
      }


      if (request.getConfigVersions() != null) {
        safeToUpdateConfigsForService(s, oldState, newState);


        for (Entry<String,String> entry :
            request.getConfigVersions().entrySet()) {
          if (LOG.isDebugEnabled()) {
            LOG.debug("Attaching config to service"
                + ", clusterName=" + cluster.getClusterName()
                + ", serviceName=" + s.getName()
                + ", configType=" + entry.getKey()
                + ", configTag=" + entry.getValue());
          }
          Config config = cluster.getDesiredConfig(
              entry.getKey(), entry.getValue());
          if (null == config) {
            // throw error for invalid config
            throw new AmbariException("Trying to update service with"
                + " invalid configs"
                + ", clusterName=" + cluster.getClusterName()
                + ", clusterId=" + cluster.getClusterId()
                + ", serviceName=" + s.getName()
                + ", invalidConfigType=" + entry.getKey()
                + ", invalidConfigTag=" + entry.getValue());
          }
        }
      }




      if (newState == null) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("Nothing to do for new updateService request"
              + ", clusterName=" + request.getClusterName()
              + ", serviceName=" + request.getServiceName()
              + ", newDesiredState=null");
        }
        continue;
      }


      seenNewStates.add(newState);


      if (newState != oldState) {
        if (!isValidDesiredStateTransition(oldState, newState)) {
          throw new AmbariException("Invalid transition for"
              + " service"
              + ", clusterName=" + cluster.getClusterName()
              + ", clusterId=" + cluster.getClusterId()
              + ", serviceName=" + s.getName()
              + ", currentDesiredState=" + oldState
              + ", newDesiredState=" + newState);


        }
        if (!changedServices.containsKey(newState)) {
          changedServices.put(newState, new ArrayList<Service>());
        }
        changedServices.get(newState).add(s);
      }


      // TODO should we check whether all servicecomponents and
      // servicecomponenthosts are in the required desired state?


      for (ServiceComponent sc : s.getServiceComponents().values()) {
        State oldScState = sc.getDesiredState();
        if (newState != oldScState) {
          if (sc.isClientComponent() &&
              !newState.isValidClientComponentState()) {
            continue;
          }
          if (!isValidDesiredStateTransition(oldScState, newState)) {
            throw new AmbariException("Invalid transition for"
                + " servicecomponent"
                + ", clusterName=" + cluster.getClusterName()
                + ", clusterId=" + cluster.getClusterId()
                + ", serviceName=" + sc.getServiceName()
                + ", componentName=" + sc.getName()
                + ", currentDesiredState=" + oldScState
                + ", newDesiredState=" + newState);
          }
          if (!changedComps.containsKey(newState)) {
            changedComps.put(newState, new ArrayList<ServiceComponent>());
          }
          changedComps.get(newState).add(sc);
        }
        if (LOG.isDebugEnabled()) {
          LOG.debug("Handling update to ServiceComponent"
              + ", clusterName=" + request.getClusterName()
              + ", serviceName=" + s.getName()
              + ", componentName=" + sc.getName()
              + ", currentDesiredState=" + oldScState
              + ", newDesiredState=" + newState);
        }
        for (ServiceComponentHost sch : sc.getServiceComponentHosts().values()){
          State oldSchState = sch.getState();
          if (newState == oldSchState) {
            sch.setDesiredState(newState);
            if (LOG.isDebugEnabled()) {
              LOG.debug("Ignoring ServiceComponentHost"
                  + ", clusterName=" + request.getClusterName()

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          .get(request.getServiceName()).add(request.getComponentName());


      Service s = cluster.getService(request.getServiceName());
      ServiceComponent sc = s.getServiceComponent(
        request.getComponentName());
      State oldState = sc.getDesiredState();
      State newState = null;
      if (request.getDesiredState() != null) {
        newState = State.valueOf(request.getDesiredState());
        if (!newState.isValidDesiredState()) {
          throw new IllegalArgumentException("Invalid arguments, invalid"
              + " desired state, desiredState=" + newState.toString());
        }
      }


      if (request.getConfigVersions() != null) {
        safeToUpdateConfigsForServiceComponent(sc, oldState, newState);


        for (Entry<String,String> entry :
            request.getConfigVersions().entrySet()) {
          Config config = cluster.getDesiredConfig(
              entry.getKey(), entry.getValue());
          if (null == config) {
            // throw error for invalid config
            throw new AmbariException("Trying to update servicecomponent with"
                + " invalid configs"
                + ", clusterName=" + cluster.getClusterName()
                + ", clusterId=" + cluster.getClusterId()
                + ", serviceName=" + s.getName()
                + ", componentName=" + sc.getName()
                + ", invalidConfigType=" + entry.getKey()
                + ", invalidConfigTag=" + entry.getValue());
          }
        }
      }


      if (newState == null) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("Nothing to do for new updateServiceComponent request"
              + ", clusterName=" + request.getClusterName()
              + ", serviceName=" + request.getServiceName()
              + ", componentName=" + request.getComponentName()
              + ", newDesiredState=null");
        }
        continue;
      }


      if (sc.isClientComponent() &&
          !newState.isValidClientComponentState()) {
        throw new AmbariException("Invalid desired state for a client"
            + " component");
      }


      seenNewStates.add(newState);


      State oldScState = sc.getDesiredState();
      if (newState != oldScState) {
        if (!isValidDesiredStateTransition(oldScState, newState)) {
          // FIXME throw correct error
          throw new AmbariException("Invalid transition for"
              + " servicecomponent"
              + ", clusterName=" + cluster.getClusterName()
              + ", clusterId=" + cluster.getClusterId()
              + ", serviceName=" + sc.getServiceName()
              + ", componentName=" + sc.getName()
              + ", currentDesiredState=" + oldScState
              + ", newDesiredState=" + newState);
        }
        if (!changedComps.containsKey(newState)) {
          changedComps.put(newState, new ArrayList<ServiceComponent>());
        }
        if (LOG.isDebugEnabled()) {
          LOG.debug("Handling update to ServiceComponent"
              + ", clusterName=" + request.getClusterName()
              + ", serviceName=" + s.getName()
              + ", componentName=" + sc.getName()
              + ", currentDesiredState=" + oldScState
              + ", newDesiredState=" + newState);
        }
        changedComps.get(newState).add(sc);
      }


      for (ServiceComponentHost sch : sc.getServiceComponentHosts().values()) {
        State oldSchState = sch.getState();
        if (newState == oldSchState) {
          sch.setDesiredState(newState);
          if (LOG.isDebugEnabled()) {
            LOG.debug("Ignoring ServiceComponentHost"
                + ", clusterName=" + request.getClusterName()

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      Service s = cluster.getService(request.getServiceName());
      ServiceComponent sc = s.getServiceComponent(
        request.getComponentName());
      ServiceComponentHost sch = sc.getServiceComponentHost(
        request.getHostname());
      State oldState = sch.getState();
      State newState = null;
      if (request.getDesiredState() != null) {
        newState = State.valueOf(request.getDesiredState());
        if (!newState.isValidDesiredState()) {
          throw new IllegalArgumentException("Invalid arguments, invalid"
              + " desired state, desiredState=" + newState.toString());
        }
      }


      if (request.getConfigVersions() != null) {
        safeToUpdateConfigsForServiceComponentHost(sch, oldState, newState);


        for (Entry<String,String> entry :
            request.getConfigVersions().entrySet()) {
          Config config = cluster.getDesiredConfig(
              entry.getKey(), entry.getValue());
          if (null == config) {
            throw new AmbariException("Trying to update servicecomponenthost"
                + " with invalid configs"
                + ", clusterName=" + cluster.getClusterName()
                + ", clusterId=" + cluster.getClusterId()
                + ", serviceName=" + s.getName()
                + ", componentName=" + sc.getName()
                + ", hostname=" + sch.getHostName()
                + ", invalidConfigType=" + entry.getKey()
                + ", invalidConfigTag=" + entry.getValue());
          }
        }
      }


      if (newState == null) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("Nothing to do for new updateServiceComponentHost request"
              + ", clusterName=" + request.getClusterName()
              + ", serviceName=" + request.getServiceName()
              + ", componentName=" + request.getComponentName()
              + ", hostname=" + request.getHostname()
              + ", newDesiredState=null");
        }
        continue;
      }


      if (sc.isClientComponent() &&
          !newState.isValidClientComponentState()) {
        throw new IllegalArgumentException("Invalid desired state for a client"
            + " component");
      }


      seenNewStates.add(newState);


      State oldSchState = sch.getState();
      if (newState == oldSchState) {
        sch.setDesiredState(newState);
        if (LOG.isDebugEnabled()) {
          LOG.debug("Ignoring ServiceComponentHost"
              + ", clusterName=" + request.getClusterName()

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    componentStatus2.setComponentName(SECONDARY_NAMENODE);
    componentStatuses.add(componentStatus2);
    hb.setComponentStatus(componentStatuses);


    handler.handleHeartBeat(hb);
    State componentState1 = serviceComponentHost1.getState();
    State componentState2 = serviceComponentHost2.getState();
    State componentState3 = serviceComponentHost3.getState();
    assertEquals(State.STARTED, componentState1);
    assertEquals(State.INSTALLED, componentState2);
    assertEquals(State.STARTED, componentState3);
  }

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    componentStatuses.add(componentStatus2);


    hb.setComponentStatus(componentStatuses);


    handler.handleHeartBeat(hb);
    State componentState1 = serviceComponentHost1.getState();
    State componentState2 = serviceComponentHost2.getState();
    assertEquals(State.STARTED, componentState1);
    assertEquals(State.INSTALLED, componentState2);
  }

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    reports.add(cr);
    hb.setReports(reports);
    hb.setComponentStatus(new ArrayList<ComponentStatus>());


    handler.handleHeartBeat(hb);
    State componentState1 = serviceComponentHost1.getState();
    assertEquals("Host state should still be installing", State.INSTALLING, componentState1);
  }

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      }
      serviceNames.get(request.getClusterName()).add(request.getServiceName());


      if (request.getDesiredState() != null
          && !request.getDesiredState().isEmpty()) {
        State state = State.valueOf(request.getDesiredState());
        if (!state.isValidDesiredState()
            || state != State.INIT) {
          throw new IllegalArgumentException("Invalid desired state"
              + " only INIT state allowed during creation"
              + ", providedDesiredState=" + request.getDesiredState());
        }
      }


      Cluster cluster;
      try {
        cluster = clusters.getCluster(request.getClusterName());
      } catch (ClusterNotFoundException e) {
        throw new ParentObjectNotFoundException("Attempted to add a service to a cluster which doesn't exist", e);
      }
      try {
        Service s = cluster.getService(request.getServiceName());
        if (s != null) {
          // throw error later for dup
          duplicates.add(request.getServiceName());
          continue;
        }
      } catch (ServiceNotFoundException e) {
        // Expected
      }


      StackId stackId = cluster.getDesiredStackVersion();
      if (!ambariMetaInfo.isValidService(stackId.getStackName(),
          stackId.getStackVersion(), request.getServiceName())) {
        throw new IllegalArgumentException("Unsupported or invalid service"
            + " in stack"
            + ", clusterName=" + request.getClusterName()
            + ", serviceName=" + request.getServiceName()
            + ", stackInfo=" + stackId.getStackId());
      }
    }


    // ensure only a single cluster update
    if (serviceNames.size() != 1) {
      throw new IllegalArgumentException("Invalid arguments, updates allowed"
          + "on only one cluster at a time");
    }


    // Validate dups
    if (!duplicates.isEmpty()) {
      StringBuilder svcNames = new StringBuilder();
      boolean first = true;
      for (String svcName : duplicates) {
        if (!first) {
          svcNames.append(",");
        }
        first = false;
        svcNames.append(svcName);
      }
      String clusterName = requests.iterator().next().getClusterName();
      String msg;
      if (duplicates.size() == 1) {
        msg = "Attempted to create a service which already exists: "
            + ", clusterName=" + clusterName  + " serviceName=" + svcNames.toString();
      } else {
        msg = "Attempted to create services which already exist: "
            + ", clusterName=" + clusterName  + " serviceNames=" + svcNames.toString();
      }
      throw new DuplicateResourceException(msg);
    }


    // now to the real work
    for (ServiceRequest request : requests) {
      Cluster cluster = clusters.getCluster(request.getClusterName());


      // FIXME initialize configs based off service.configVersions
      Map<String, Config> configs = new HashMap<String, Config>();


      State state = State.INIT;


      // Already checked that service does not exist
      Service s = serviceFactory.createNew(cluster, request.getServiceName());


      s.setDesiredState(state);

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      componentNames.get(request.getClusterName())
          .get(request.getServiceName()).add(request.getComponentName());


      if (request.getDesiredState() != null
          && !request.getDesiredState().isEmpty()) {
        State state = State.valueOf(request.getDesiredState());
        if (!state.isValidDesiredState()
            || state != State.INIT) {
          throw new IllegalArgumentException("Invalid desired state"
              + " only INIT state allowed during creation"
              + ", providedDesiredState=" + request.getDesiredState());
        }
      }


      Service s;
      try {
        s = cluster.getService(request.getServiceName());
      } catch (ServiceNotFoundException e) {
        throw new ParentObjectNotFoundException(
            "Attempted to add a component to a service which doesn't exist:", e);
      }
      try {
        ServiceComponent sc = s.getServiceComponent(request.getComponentName());
        if (sc != null) {
          // throw error later for dup
          duplicates.add("[clusterName=" + request.getClusterName() + ", serviceName=" + request.getServiceName() +
              ", componentName=" + request.getComponentName() + "]");
          continue;
        }
      } catch (AmbariException e) {
        // Expected
      }


      StackId stackId = s.getDesiredStackVersion();
      if (!ambariMetaInfo.isValidServiceComponent(stackId.getStackName(),
          stackId.getStackVersion(), s.getName(), request.getComponentName())) {
        throw new IllegalArgumentException("Unsupported or invalid component"
            + " in stack"
            + ", clusterName=" + request.getClusterName()
            + ", serviceName=" + request.getServiceName()
            + ", componentName=" + request.getComponentName()
            + ", stackInfo=" + stackId.getStackId());
      }
    }


    // ensure only a single cluster update
    if (componentNames.size() != 1) {
      throw new IllegalArgumentException("Invalid arguments, updates allowed"
          + "on only one cluster at a time");
    }


    // Validate dups
    if (!duplicates.isEmpty()) {
      StringBuilder names = new StringBuilder();
      boolean first = true;
      for (String cName : duplicates) {
        if (!first) {
          names.append(",");
        }
        first = false;
        names.append(cName);
      }
      String msg;
      if (duplicates.size() == 1) {
        msg = "Attempted to create a component which already exists: ";
      } else {
        msg = "Attempted to create components which already exist: ";
      }
      throw new DuplicateResourceException(msg + names.toString());
    }




    // now doing actual work
    for (ServiceComponentRequest request : requests) {
      Cluster cluster = clusters.getCluster(request.getClusterName());
      Service s = cluster.getService(request.getServiceName());
      ServiceComponent sc = serviceComponentFactory.createNew(s,
          request.getComponentName());
      sc.setDesiredStackVersion(s.getDesiredStackVersion());


      if (request.getDesiredState() != null
          && !request.getDesiredState().isEmpty()) {
        State state = State.valueOf(request.getDesiredState());
        sc.setDesiredState(state);
      } else {
        sc.setDesiredState(s.getDesiredState());
      }

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