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Camunda BPM Assert Scenario allows you to specify the actions needed at process wait states before you start the process instances executing your test scenario. As a consequence, writing such tests is easier and faster than ever before. And refactoring and changing large process models and their test suites can almost be done in the blink of an eye: ;-) Done! Check it out and judge yourself!
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package org.camunda.bpm.scenario.impl.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;

public abstract class Log {

  private static String LOGGER = "org.camunda.bpm.scenario";
  private static ScenarioLog scenarioLog = Api.feature("org.slf4j.Logger").isSupported() ? new Slf4jLog() : new JavaLog();

  private static String space;
  private static String prefix;

  private interface ScenarioLog {

    boolean isDebugEnabled();
    void debug(String message);
    void info(String message);

  }

  private static class Slf4jLog implements ScenarioLog {

    org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(LOGGER);

    @Override
    public boolean isDebugEnabled() {
      return log.isDebugEnabled();
    }

    @Override
    public void debug(String message) {
      log.debug(message);
    }

    @Override
    public void info(String message) {
      log.info(message);
    }

  }

  private static class JavaLog implements ScenarioLog {

    Logger log = Logger.getLogger(LOGGER);

    @Override
    public boolean isDebugEnabled() {
      return log.isLoggable(Level.FINE);
    }

    @Override
    public void debug(String message) {
      log.log(Level.FINE, message);
    }

    @Override
    public void info(String message) {
      log.log(Level.INFO, message);
    }

  }

  private interface ScenarioLoggable {

    String instanceFormat = "%s %s %s LABEL(%s @ %s # %s)";
    DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd' 'HH:mm:ss");

    void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time);

  }

  public enum Action implements ScenarioLoggable {

    StartingAt {

      private void init() {
        space = "";
        prefix = "|";
      }

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        init();
        scenarioLog.info(String.format("%s Starting scenario at %s", "*", dateFormat.format(Time.get())));
      }

    },

    FastForward {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        scenarioLog.info(String.format("%s Fast-forwarding scenario to %s", prefix, dateFormat.format(Time.get())));
        prefix = space + "|--";
        space = space + "  ";
      }

    },

    FinishingAt {

      private void init() {
        space = "";
        prefix = "|";
      }

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        scenarioLog.info(String.format("%s Finishing scenario at %s", space + "*", dateFormat.format(Time.get())));
        init();
      }

    },

    ActingOn {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        String message;
        if (activityName != null) {
          message = String.format(ScenarioLoggable.instanceFormat.replace("LABEL", "'%s' "),
              space + "*",
              Strings.rightpad(toString(), 9),
              Strings.rightpad(activityType, 18),
              Strings.trimAll(activityName),
              activityId,
              processDefinitionKey,
              processInstanceId);
        } else {
          message = String.format(ScenarioLoggable.instanceFormat.replace("LABEL", ""),
              space + "*",
              Strings.rightpad(toString(), 9),
              Strings.rightpad(activityType, 18),
              activityId,
              processDefinitionKey,
              processInstanceId);
        }
        scenarioLog.info(message);
        prefix = space + "|";
      }

      @Override
      public String toString() {
        return "Acting on";
      }

    },

    Deferring_Action {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        if (scenarioLog.isDebugEnabled()) {
          String message = String.format("%s %s %s '%s' until %s (%s @ %s # %s : %s)",
              prefix,
              Strings.rightpad("Deferring", 9),
              Strings.rightpad("action on", 18),
              Strings.trimAll(activityName),
              dateFormat.format(time),
              activityId,
              processDefinitionKey,
              processInstanceId,
              actionId);
          scenarioLog.debug(message);
          prefix = space + "|";
        }
      }

    },

    Executing_Action {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        String message = String.format("%s %s %s '%s' (%s @ %s # %s : %s)",
            prefix,
            Strings.rightpad("Executing", 9),
            Strings.rightpad("deferred action on", 18),
            Strings.trimAll(activityName),
            activityId,
            processDefinitionKey,
            processInstanceId,
            actionId);
        scenarioLog.info(message);
        prefix = space + "|";
      }

    },

    Executing_Job {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        if (scenarioLog.isDebugEnabled()) {
          String message = String.format("%s %s %s (%s @ %s # %s)",
              prefix,
              Strings.rightpad(toString(), 9),
              Strings.rightpad(activityType, 18),
              Strings.trimAll(activityName),
              processDefinitionKey,
              processInstanceId
          );
          scenarioLog.debug(message);
          prefix = space + "|";
        }
      }

    },

    Started {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        if (scenarioLog.isDebugEnabled()) {
          scenarioLog.debug(message(this, activityType, activityName, activityId, processDefinitionKey, processInstanceId));
          prefix = space + "|";
        }
      }

    },

    Finished {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        scenarioLog.info(message(this, activityType, activityName, activityId, processDefinitionKey, processInstanceId));
        prefix = space + "|";
      }

    },

    Canceled {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        scenarioLog.info(message(this, activityType, activityName, activityId, processDefinitionKey, processInstanceId));
        prefix = space + "|";
      }

    },

    Completed {

      public void log(String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId, String actionId, Date time) {
        scenarioLog.info(message(this, activityType, activityName, activityId, processDefinitionKey, processInstanceId));
        prefix = space + "|";
      }

    },

  }

  private static String message(Action action, String activityType, String activityName, String activityId, String processDefinitionKey, String processInstanceId) {
    String message;
    if (activityName != null && !activityName.equals("")) {
      message = String.format(ScenarioLoggable.instanceFormat.replace("LABEL", "'%s' "),
          prefix,
          Strings.rightpad(action.toString(), 9),
          Strings.rightpad(activityType, 18),
          Strings.trimAll(activityName),
          activityId,
          processDefinitionKey,
          processInstanceId);
    } else {
      message = String.format(ScenarioLoggable.instanceFormat.replace("LABEL", ""),
          prefix,
          Strings.rightpad(action.toString(), 9),
          Strings.rightpad(activityType, 18),
          activityId,
          processDefinitionKey,
          processInstanceId);
    }
    return message;
  }

}