82: Remove lifecycle operations from the TickerService API

src/main/tjava/com/r35157/assetaz/services/ticker/TickerService.tjava

@@ -6,21 +6,13 @@ import org.jetbrains.annotations.NotNull;
 
 /**
  * Provides price observations for trading pairs.
+ *
+ * <p>The service contract contains only operations for ordinary consumers.
+ * The Hub owns startup through the implementation's separate
+ * {@code NenjimProcess} view.</p>
  */
 public interface TickerService extends NenjimComponent {
 
-    /**
-     * Starts the ticker service.
-     *
-     * @throws IllegalStateException if the service cannot be started
-     */
-    void start();
-
-    /**
-     * Stops every source started by this service.
-     */
-    void stop();
-
     /**
      * Returns the latest available price observation for a trading pair.
      *

src/main/tjava/com/r35157/assetaz/services/ticker/impl/ref/TickerServiceImpl.tjava

@@ -39,6 +39,11 @@ import java.util.concurrent.atomic.AtomicReference;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
+/**
+ * Reference Ticker implementation whose domain API is exposed through
+ * {@link TickerService} and whose startup is owned by the Hub through
+ * {@link NenjimProcess}.
+ */
 public final class TickerServiceImpl implements
         TickerService,
         PriceSink,
@@ -88,24 +93,6 @@ public final class TickerServiceImpl implements
         }
     }
 
-    @Override
-    public synchronized void stop() {
-        if (state == LifecycleState.NEW || state == LifecycleState.STOPPED) {
-            return;
-        }
-        if (state != LifecycleState.STARTED) {
-            throw new IllegalStateException("Ticker service cannot stop while in state " + state);
-        }
-
-        state = LifecycleState.STOPPING;
-        RuntimeException failure = stopStartedSources();
-        resetStoppedState();
-
-        if (failure != null) {
-            throw failure;
-        }
-    }
-
     @Override
     public synchronized @NotNull PriceObservation getLatestPrice(
             @NotNull TradingPair tradingPair