public WaitReason canStart()

in server/src/jetbrains/buildServer/queueManager/server/QueuePausePrecondition.java [32:67]
31 lines of code
6 McCabe index (conditional complexity)

  public WaitReason canStart(@NotNull QueuedBuildInfo queuedBuild,
                             @NotNull Map<QueuedBuildInfo, BuildAgent> canBeStarted,
                             @NotNull BuildDistributorInput buildDistributorInput,
                             boolean emulationMode) {
    final BuildDistributorInputEx input = (BuildDistributorInputEx) buildDistributorInput;
    final WaitReason cachedWaitReason = input.getCustomData(PROPERTY_WAIT_REASON, WaitReason.class);
    if (cachedWaitReason != null) {
      return cachedWaitReason;
    }
    // check that we have already checked this precondition this cycle
    if (input.getCustomData(PROPERTY_CHECKED, Boolean.class) != null) {
      return null;
    }
    // no wait reason, haven't checked within this cycle
    QueueState state;
    final QueueState cachedState = input.getCustomData(PROPERTY_QUEUE_STATE, QueueState.class);
    if (cachedState != null) {
      state = cachedState;
    } else {
      state = myQueueStateManager.readQueueState();
    }

    if (!state.isQueueEnabled()) {
      WaitReason reason = new SimpleWaitReason("Build queue was paused");
      if (LOG.isDebugEnabled()) {
        LOG.debug("Build queue was paused. Returning wait reason [" + reason.getDescription() + "]");
      }
      // cache wait reason in the distribution context,
      // so all other builds in the distribution cycle will receive it
      input.setCustomData(PROPERTY_WAIT_REASON, reason);
      return reason;
    } else {
      input.setCustomData(PROPERTY_CHECKED, Boolean.TRUE);
    }
    return null;
  }