/* 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.bpmn.helper;

import java.util.List;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.delegate.event.ActivitiEvent;
import org.activiti.engine.delegate.event.ActivitiEventListener;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.engine.impl.persistence.entity.SignalEventSubscriptionEntity;

/**
 * An {@link ActivitiEventListener} that throws a signal event when an event is
 * dispatched to it.
 * 
 * @author Frederik Heremans
 * 
 */
public class SignalThrowingEventListener extends BaseDelegateEventListener {

	protected String signalName;
	protected boolean processInstanceScope = true;

	@Override
	public void onEvent(ActivitiEvent event) {
		if (isValidEvent(event)) {

			if (event.getProcessInstanceId() == null && processInstanceScope) {
				throw new ActivitiIllegalArgumentException(
				    "Cannot throw process-instance scoped signal, since the dispatched event is not part of an ongoing process instance");
			}

			CommandContext commandContext = Context.getCommandContext();
			List<SignalEventSubscriptionEntity> subscriptionEntities = null;
			if (processInstanceScope) {
				subscriptionEntities = commandContext.getEventSubscriptionEntityManager()
				    .findSignalEventSubscriptionsByProcessInstanceAndEventName(event.getProcessInstanceId(), signalName);
			} else {
				String tenantId = null;
				if (event.getProcessDefinitionId() != null) {
					ProcessDefinitionEntity processDefinitionEntity = commandContext.getProcessEngineConfiguration()
							.getDeploymentManager().findDeployedProcessDefinitionById(event.getProcessDefinitionId());
					tenantId = processDefinitionEntity.getTenantId();
				}
				subscriptionEntities = commandContext.getEventSubscriptionEntityManager()
				    .findSignalEventSubscriptionsByEventName(signalName, tenantId);
			}

			for (SignalEventSubscriptionEntity signalEventSubscriptionEntity : subscriptionEntities) {
				signalEventSubscriptionEntity.eventReceived(null, false);
			}
		}
	}

	public void setSignalName(String signalName) {
		this.signalName = signalName;
	}

	public void setProcessInstanceScope(boolean processInstanceScope) {
		this.processInstanceScope = processInstanceScope;
	}

	@Override
	public boolean isFailOnException() {
		return true;
	}
}