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nFlow integration tests

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package io.nflow.tests.demo.workflow;

import static io.nflow.engine.workflow.definition.NextAction.moveToStateAfter;
import static io.nflow.engine.workflow.definition.WorkflowStateType.end;
import static io.nflow.engine.workflow.definition.WorkflowStateType.manual;
import static io.nflow.engine.workflow.definition.WorkflowStateType.normal;
import static io.nflow.engine.workflow.definition.WorkflowStateType.start;
import static org.joda.time.DateTime.now;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import io.nflow.engine.workflow.definition.NextAction;
import io.nflow.engine.workflow.definition.StateExecution;
import io.nflow.engine.workflow.definition.WorkflowDefinition;
import io.nflow.engine.workflow.definition.WorkflowState;
import io.nflow.engine.workflow.definition.WorkflowStateType;

@Component
public class ForeverWaitingWorkflow extends WorkflowDefinition {
  private static final Logger logger = LoggerFactory.getLogger(ForeverWaitingWorkflow.class);

  public enum State implements WorkflowState {
    begin(start), waiting(normal), done(end), error(manual);

    private WorkflowStateType type;

    State(WorkflowStateType type) {
      this.type = type;
    }

    @Override
    public WorkflowStateType getType() {
      return type;
    }
  }

  public static final String FOREVER_WAITING_WORKFLOW_TYPE = "foreverWaiting";

  public ForeverWaitingWorkflow() {
    super(FOREVER_WAITING_WORKFLOW_TYPE, ForeverWaitingWorkflow.State.begin, ForeverWaitingWorkflow.State.error);
    setDescription("Workflow that waits for a year in 'waiting' state");
    permit(ForeverWaitingWorkflow.State.begin, ForeverWaitingWorkflow.State.waiting);
    permit(ForeverWaitingWorkflow.State.waiting, ForeverWaitingWorkflow.State.waiting);
  }

  public NextAction begin(@SuppressWarnings("unused") StateExecution execution) {
    logger.info("in begin state");
    return moveToStateAfter(ForeverWaitingWorkflow.State.waiting, now().plusYears(1), "Move to waiting after an year");
  }

  public NextAction waiting(@SuppressWarnings("unused") StateExecution execution) {
    logger.info("in waiting state");
    return moveToStateAfter(ForeverWaitingWorkflow.State.waiting, now().plusYears(1), "Move to waiting again after an year");
  }

}