/
ControllerContext.java
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/
ControllerContext.java
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package org.openremote.controller.context;
import org.openremote.controller.event.Event;
import org.openremote.controller.event.EventProcessingContext;
import org.openremote.controller.event.EventProcessorChain;
import org.openremote.controller.deploy.Deployment;
import org.openremote.controller.model.Sensor;
import org.openremote.controller.command.Commands;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* An instance of a controller, bootstrapped from {@link Deployment}, this is the main API.
*/
public class ControllerContext {
private static final Logger LOG = Logger.getLogger(ControllerContext.class.getName());
final protected String controllerID;
final protected Deployment deployment;
final protected Commands commands;
final protected EventProcessorChain eventProcessorChain;
private volatile Boolean shutdownInProgress = false;
public ControllerContext(String controllerID, Deployment deployment) {
this.controllerID = controllerID;
this.deployment = deployment;
this.commands = new Commands(deployment);
this.eventProcessorChain = new EventProcessorChain(commands, deployment.getEventProcessors());
}
public String getControllerID() {
return controllerID;
}
public Deployment getDeployment() {
return deployment;
}
public Commands getCommands() {
return commands;
}
protected StateStorage getStateStorage() {
return getDeployment().getStateStorage();
}
public synchronized void start() {
if (shutdownInProgress)
return;
LOG.info("Starting context: " + getControllerID());
eventProcessorChain.start();
for (Sensor sensor : deployment.getSensors()) {
// Put initial state "unknown" for each sensor
getStateStorage().put(new SensorState(new Sensor.UnknownEvent(sensor)));
sensor.start(this);
}
}
/**
* <ul>
* <li>event processors are stopped</li>
* <li>sensors are stopped</li>
* <li>the current state is cleared</li>
* </ul>
*/
public synchronized void stop() {
try {
LOG.info("Stopping context: " + getControllerID());
shutdownInProgress = true;
eventProcessorChain.stop();
for (Sensor sensor : deployment.getSensors()) {
try {
sensor.stop();
} catch (Throwable t) {
LOG.log(Level.SEVERE, "Failed to stop sensor: " + sensor, t);
}
}
getStateStorage().clear();
} finally {
shutdownInProgress = false;
}
}
public synchronized void update(Event event) {
LOG.fine("==> Update from event: " + event);
if (shutdownInProgress) {
LOG.fine("<== Shutting down. Ignoring update from: " + event.getSource());
return;
}
EventProcessingContext ctx = new EventProcessingContext(this, event);
eventProcessorChain.push(ctx);
// Early exist if one of the processors decided to terminate the chain
if (ctx.hasTerminated()) {
LOG.fine("<== Updating status complete, event context terminated, no update was made for event: " + ctx.getEvent());
return;
}
getStateStorage().put(new SensorState(event));
LOG.fine("<== Updating status complete for event: " + event);
}
public String queryValue(int sensorID) {
if (!getStateStorage().contains(sensorID)) {
LOG.info("Requested sensor id '" + sensorID + "' was not found. Defaulting to: " + Sensor.UNKNOWN_STATUS);
return Sensor.UNKNOWN_STATUS;
}
return getStateStorage().get(sensorID).getEvent().serialize();
}
public String queryValue(String sensorName) {
return queryValue(deployment.getSensorID(sensorName));
}
public Event queryEvent(int sensorID) {
return getStateStorage().get(sensorID).getEvent();
}
public Event queryEvent(String sensorName) {
Integer sensorID = deployment.getSensorID(sensorName);
return sensorID != null ? queryEvent(sensorID) : null;
}
}