SignalEventHandler.java

/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.event;

import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.impl.bpmn.behavior.BoundaryEventActivityBehavior;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.EventSubscriptionEntity;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.pvm.process.ActivityImpl;


/**
 * @author Daniel Meyer
 */
public class SignalEventHandler implements EventHandler {
  
  private static Logger log = Logger.getLogger(SignalEventHandler.class.getName());
  
  public static final String SIGNAL_EVENT_HANDLER_TYPE = "signal";

  public String getEventHandlerType() {
    return SIGNAL_EVENT_HANDLER_TYPE;
  }

  public void handleEvent(EventSubscriptionEntity eventSubscription, Object payload, CommandContext commandContext) {    
    
    ExecutionEntity execution = eventSubscription.getExecution();        
    ActivityImpl activity = eventSubscription.getActivity();
    
    if(activity == null) {
      throw new ActivitiException("Error while sending signal for event subscription '"+eventSubscription.getId()+"': " +
              "no activity associated with event subscription");
    }
    
    if(!execution.getActivity().equals(activity)) {
      execution.setActivity(activity);
    }
    
    if(payload instanceof Map) {
      @SuppressWarnings("unchecked")
      Map<String, Object> processVariables = (Map<String, Object>) payload;
      execution.setVariables(processVariables);
    }
    
   
    if(activity.getActivityBehavior() instanceof BoundaryEventActivityBehavior) {
           
      try {
        
        activity.getActivityBehavior()
        .execute(execution);
      
      } catch (RuntimeException e) {
        log.log(Level.SEVERE, "exception while sending signal for event subscription '"+eventSubscription+"'", e);
        throw e;
        
      } catch (Exception e) {
        log.log(Level.SEVERE, "exception while sending signal for event subscription '"+eventSubscription+"'", e);
        throw new ActivitiException("exception while sending signal for event subscription '"+eventSubscription+"':"+e.getMessage(), e);
      }
      
    } else {      // not boundary
      execution.signal("signal", null);
    }
   
  }

}