[TASK] Implement pause/resume of simulation.

src/main/java/lu/jpt/csparqltest/SimulationContext.java

@@ -13,8 +13,9 @@ import lu.jpt.csparqltest.rentacar.RentACarSimulation;
 
 public class SimulationContext {
 
-	// Internal simulation context
 	public enum SimulationState { UNINITIALIZED, INITIALIZED, RUNNING, PAUSED, SUSPENDED, TORNDOWN, ERROR};
+	
+	// Internal simulation context
 	private SimulationState currentState;
 
 	// C-SPARQL related
@@ -48,8 +49,7 @@ public class SimulationContext {
 		if(this.currentState != SimulationState.RUNNING) {
 			throw new RuntimeException("Action not allowed in this state!");
 		}
-		// TODO: Implement pausing the generatorThread(s)
-				
+		this.simulation.pauseSimulation();
 		this.currentState = SimulationState.PAUSED;
 	}
 	
@@ -57,8 +57,7 @@ public class SimulationContext {
 		if(this.currentState != SimulationState.PAUSED) {
 			throw new RuntimeException("Action not allowed in this state!");
 		}
-		// TODO: Implement resuming the generatorThread(s)
-		
+		this.simulation.resumeSimulation();
 		this.currentState = SimulationState.RUNNING;
 	}
 	

src/main/java/lu/jpt/csparqltest/gui/TextObserverWindow.java

@@ -320,8 +320,8 @@ public class TextObserverWindow extends JFrame implements Observer {
 		}
 		Color[] result = new Color[sizeOfPalette];
 		float h = 0.0f;
-		float s = 0.75f;
-		float b = 0.75f;
+		float s = 0.8f;
+		float b = 0.65f;
 		for(int i=0; i<sizeOfPalette; i++) {
 			h = (((float) i)/((float) sizeOfPalette));
 			result[i] = Color.getHSBColor(h, s, b);

src/main/java/lu/jpt/csparqltest/rentacar/RentACarSimulation.java

@@ -20,6 +20,7 @@ public class RentACarSimulation implements Runnable {
 	private List<Driver> drivers;
 	
 	private volatile boolean runSimulation;
+	private volatile boolean pauseSimulation;
 	
 	private RdfStream carStream;
 	private RdfStream driverStream;
@@ -41,6 +42,7 @@ public class RentACarSimulation implements Runnable {
 		this.driverStream = new WindowLoggingRdfStream(DRIVER_STREAM_IRI);
 		// Green light for simulation
 		this.runSimulation = true;
+		this.pauseSimulation = false;
 	}
 	
 	public RdfStream getCarStream() {
@@ -58,6 +60,9 @@ public class RentACarSimulation implements Runnable {
 	public void run() {
 		// Run the simulation as long as needed
 		while(this.runSimulation) {
+			if(this.pauseSimulation) {
+				this.waitForSimulationToResume();
+			}
 			// A driver will autonomously pick a car, use it for some time and leave it.
 			for(Driver driver : this.drivers) {
 				driver.tick();
@@ -93,6 +98,23 @@ public class RentACarSimulation implements Runnable {
 			}
 		}
 	}
+	
+	private synchronized void waitForSimulationToResume() {
+		try {
+			while(this.pauseSimulation) this.wait();
+		} catch (InterruptedException e) {
+			// No matter what, just wait again.
+		}
+	}
+	
+	public synchronized void pauseSimulation() {
+		this.pauseSimulation = true;
+	}
+	
+	public synchronized void resumeSimulation() {
+		this.pauseSimulation = false;
+		this.notify();
+	}
 
 	/**
 	 * Tells the simulation to stop