private WaitReason processSingleBuild()

in server/src/jetbrains/buildServer/sharedResources/server/SharedResourcesStartBuildPrecondition.java [227:258]
30 lines of code
8 McCabe index (conditional complexity)

  private WaitReason processSingleBuild(@NotNull final BuildPromotionEx buildPromotion,
                                        @NotNull final DistributionDataAccessor accessor,
                                        @NotNull final Supplier<Map<Resource, TakenLock>> takenLocksSupplier,
                                        @NotNull final BuildPromotion promotion,
                                        final boolean emulationMode) {
    final String projectId = buildPromotion.getProjectId();
    final SBuildType buildType = buildPromotion.getBuildType();
    WaitReason reason = null;
    if (buildType != null && projectId != null) {
      final Collection<SharedResourcesFeature> features = myFeatures.searchForFeatures(buildPromotion);
      if (!features.isEmpty()) {
        reason = checkForInvalidLocks(buildPromotion);
        if (reason == null) {
          // Collection<Lock> ---> Collection<ResolvedLock> (i.e. lock against resolved resource. With project and so on)
          final Collection<Lock> locksToTake = myLocks.fromBuildFeaturesAsMap(features).values();
          if (!locksToTake.isEmpty()) {
            // Collection<Lock> --> Collection<ResolvedLock>. For quoted - number of insufficient quotes, for custom -> custom values
            final Map<Resource, String> unavailableLocks = myTakenLocks.getUnavailableLocks(locksToTake, takenLocksSupplier.get(), projectId, accessor, promotion);
            if (!unavailableLocks.isEmpty()) {
              reason = createWaitReason(unavailableLocks);
              if (LOG.isDebugEnabled()) {
                LOG.debug("Preventing start of the queued build [" + buildPromotion.getQueuedBuild() + "] with reason: [" + reason.getDescription() + "]");
              }
            } else {
              storeResourcesAffinity(buildPromotion, projectId, takenLocksSupplier.get(), locksToTake, accessor, emulationMode); // assign ANY locks here
            }
          }
        }
      }
    }
    return reason;
  }