/**
* Copyright (c) 1997, 2015 by ProSyst Software GmbH and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.eclipse.smarthome.automation.module.core.handler;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.Map;
import java.util.Set;
import org.eclipse.smarthome.automation.Trigger;
import org.eclipse.smarthome.automation.handler.BaseTriggerModuleHandler;
import org.eclipse.smarthome.core.events.Event;
import org.eclipse.smarthome.core.events.EventFilter;
import org.eclipse.smarthome.core.events.EventSubscriber;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
/**
* This is an ModuleHandler implementation for Triggers which trigger the rule
* if an event occurs. The eventType, eventSource and topic can be set with the
* configuration. It is an generic approach which makes it easier to specify
* more concrete event based triggers with the composite module approach of the
* automation component. Each GenericTriggerHandler instance registers as
* EventSubscriber, so the dispose method must be called for unregistering the
* service.
*
* @author Benedikt Niehues - Initial contribution and API
* @author Kai Kreuzer - refactored and simplified customized module handling
*
*/
public class GenericEventTriggerHandler extends BaseTriggerModuleHandler implements EventSubscriber, EventFilter {
private final Logger logger = LoggerFactory.getLogger(GenericEventTriggerHandler.class);
private String source;
private String topic;
private Set<String> types;
private BundleContext bundleContext;
public static final String MODULE_TYPE_ID = "core.GenericEventTrigger";
private static final String CFG_EVENT_TOPIC = "eventTopic";
private static final String CFG_EVENT_SOURCE = "eventSource";
private static final String CFG_EVENT_TYPES = "eventTypes";
@SuppressWarnings("rawtypes")
private ServiceRegistration eventSubscriberRegistration;
public GenericEventTriggerHandler(Trigger module, BundleContext bundleContext) {
super(module);
this.source = (String) module.getConfiguration().get(CFG_EVENT_SOURCE);
this.topic = (String) module.getConfiguration().get(CFG_EVENT_TOPIC);
this.types = ImmutableSet.copyOf(((String) module.getConfiguration().get(CFG_EVENT_TYPES)).split(","));
this.bundleContext = bundleContext;
Dictionary<String, Object> properties = new Hashtable<String, Object>();
properties.put("event.topics", topic);
eventSubscriberRegistration = this.bundleContext.registerService(EventSubscriber.class.getName(), this,
properties);
logger.trace("Registered EventSubscriber: Topic: {} Type: {} Source: {}", topic, types, source);
}
@Override
public Set<String> getSubscribedEventTypes() {
return types;
}
@Override
public EventFilter getEventFilter() {
return this;
}
@Override
public void receive(Event event) {
if (ruleEngineCallback != null) {
logger.trace("Received Event: Source: {} Topic: {} Type: {} Payload: {}", event.getSource(),
event.getTopic(), event.getType(), event.getPayload());
if (!event.getTopic().contains(source)) {
return;
}
Map<String, Object> values = Maps.newHashMap();
values.put("event", event);
ruleEngineCallback.triggered(this.module, values);
}
}
/**
* @return the topic
*/
public String getTopic() {
return topic;
}
/**
* @param topic
* the topic to set
*/
public void setTopic(String topic) {
this.topic = topic;
}
/**
* do the cleanup: unregistering eventSubscriber...
*/
@Override
public void dispose() {
super.dispose();
if (eventSubscriberRegistration != null) {
eventSubscriberRegistration.unregister();
eventSubscriberRegistration = null;
}
}
@Override
public boolean apply(Event event) {
logger.trace("->FILTER: {}:{}", event.getTopic(), source);
return event.getTopic().contains(source);
}
}