Change shop updater logic

I'm not sure if this better or worse, but it's worth a try.

src/main/java/de/epiceric/shopchest/config/Config.java

@@ -4,7 +4,6 @@ import de.epiceric.shopchest.ShopChest;
 import de.epiceric.shopchest.language.LanguageUtils;
 import de.epiceric.shopchest.sql.Database;
 import de.epiceric.shopchest.utils.ItemUtils;
-import de.epiceric.shopchest.utils.ShopUpdater;
 import de.epiceric.shopchest.utils.Utils;
 
 import org.bukkit.configuration.InvalidConfigurationException;
@@ -22,11 +21,6 @@ import java.util.Set;
 
 public class Config {
 
-    /**
-     * The quality of hologram and item updating (performance saving, or better quality)
-     **/
-    public static ShopUpdater.UpdateQuality updateQuality;
-
     /**
      * The item with which a player can click a shop to retrieve information
      **/
@@ -460,7 +454,6 @@ public class Config {
     public void reload(boolean firstLoad, boolean langReload, boolean showMessages) {
         plugin.reloadConfig();
 
-        updateQuality = ShopUpdater.UpdateQuality.valueOf(plugin.getConfig().getString("update-quality"));
         shopInfoItem = ItemUtils.getItemStack(plugin.getConfig().getString("shop-info-item"));
         wgAllowCreateShopDefault = plugin.getConfig().getBoolean("worldguard-default-flag-values.create-shop");
         wgAllowUseAdminShopDefault = plugin.getConfig().getBoolean("worldguard-default-flag-values.use-admin-shop");

src/main/java/de/epiceric/shopchest/utils/ShopUpdater.java

@@ -1,40 +1,18 @@
 package de.epiceric.shopchest.utils;
 
 import de.epiceric.shopchest.ShopChest;
-import de.epiceric.shopchest.config.Config;
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
-import org.bukkit.scheduler.BukkitTask;
 
 import java.util.Queue;
 import java.util.concurrent.ConcurrentLinkedQueue;
 
 public class ShopUpdater {
     
-    public enum UpdateQuality {
-        SLOWEST(31L),
-        SLOWER(24L),
-        SLOW(17L),
-        NORMAL(10L),
-        FAST(7L),
-        FASTER(4L),
-        FASTEST(1L);
-
-        private final long interval;
-
-        UpdateQuality(long interval) {
-            this.interval = interval;
-        }
-
-        public long getInterval() {
-            return interval;
-        }
-    }
-
     private final ShopChest plugin;
     private final Queue<Runnable> beforeNext = new ConcurrentLinkedQueue<>();
 
-    private volatile BukkitTask running;
+    private volatile Thread thread;
 
     public ShopUpdater(ShopChest plugin) {
         this.plugin = plugin;
@@ -45,8 +23,19 @@ public class ShopUpdater {
      */
     public void start() {
         if (!isRunning()) {
-            long interval = Config.updateQuality.getInterval();
+            thread = new Thread(() -> {
-            running = Bukkit.getScheduler().runTaskTimerAsynchronously(plugin, new ShopUpdaterTask(), interval, interval);
+                while (!Thread.interrupted()) {
+                    for (Runnable runnable : beforeNext) {
+                        runnable.run();
+                    }
+                    beforeNext.clear();
+        
+                    for (Player p : Bukkit.getOnlinePlayers()) {
+                        plugin.getShopUtils().updateShops(p);
+                    }
+                }
+            }, "Shop Updater");
+            thread.start();
         }
     }
 
@@ -62,9 +51,9 @@ public class ShopUpdater {
      * Stop task properly
      */
     public void stop() {
-        if (running != null) {
+        if (thread != null) {
-            running.cancel();
+            thread.interrupt();
-            running = null;
+            thread = null;
         }
     }
 
@@ -72,7 +61,7 @@ public class ShopUpdater {
      * @return whether task is running or not
      */
     public boolean isRunning() {
-        return running != null;
+        return thread != null;
     }
 
     /**
@@ -83,21 +72,4 @@ public class ShopUpdater {
     public void beforeNext(Runnable runnable) {
         beforeNext.add(runnable);
     }
-
-    private class ShopUpdaterTask implements Runnable {
-
-        @Override
-        public void run() {
-            if (!beforeNext.isEmpty()) {
-                for (Runnable runnable : beforeNext) {
-                    runnable.run();
-                }
-                beforeNext.clear();
-            }
-
-            for (Player p : Bukkit.getOnlinePlayers()) {
-                plugin.getShopUtils().updateShops(p);
-            }
-        }
-    }
 }

src/main/java/de/epiceric/shopchest/utils/ShopUtils.java

@@ -307,105 +307,78 @@ public class ShopUtils {
         playerLocation.remove(player.getUniqueId());
     }
 
-    private static final double TARGET_THRESHOLD = 1;
-
     private void updateVisibleShops(Player player) {
         double itemDistSquared = Math.pow(Config.maximalItemDistance, 2);
-        double hologramDistSquared = Math.pow(Config.maximalDistance, 2);
+        boolean firstShopInSight = Config.onlyShowFirstShopInSight;
+        double maxDist = Config.maximalDistance;
 
-        boolean firstShopInSight =Config.onlyShowFirstShopInSight;
+        List<Shop> shopsInSight = new ArrayList<>();
-
+        double nearestDistSquared = Double.MAX_VALUE;
-        // used if onlyShowFirstShopInSight
-        List<Shop> otherShopsInSight = firstShopInSight ? new ArrayList<Shop>() : null;
-        double nearestDistance = 0;
         Shop nearestShop = null;
 
         Location pLoc = player.getEyeLocation();
-        double pX = pLoc.getX();
-        double pY = pLoc.getY();
-        double pZ = pLoc.getZ();
         Vector pDir = pLoc.getDirection();
-        double dirLength = pDir.length();
+
+        // Display holograms based on sight
+        for (double i = 0; i <= maxDist; i++) {
+            Location loc = pLoc.clone();
+            Vector dir = pDir.clone();
+            double factor = Math.min(i, maxDist);
+            
+            loc.add(dir.multiply(factor));
+            Location locBelow = loc.clone().subtract(0, 1, 0);
+
+            // Check block below as player may look at hologram
+            Shop shop = getShop(loc);
+            if (shop == null) {
+                shop = getShop(locBelow);
+            }
+
+            if (shop != null && shop.hasHologram()) {
+                shopsInSight.add(shop);
+                double distSquared = pLoc.distanceSquared(loc);
+                if (distSquared < nearestDistSquared) {
+                    nearestDistSquared = distSquared;
+                    nearestShop = shop;
+                }
+            }
+        }
 
         for (Shop shop : getShops()) {
-            Location shopLocation = shop.getLocation();
+            if (firstShopInSight) {
-
+                if (!shop.equals(nearestShop) && shop.hasHologram()) {
-            if (shopLocation.getWorld().getName().equals(player.getWorld().getName())) {
+                    shop.getHologram().hidePlayer(player);
-                double distanceSquared = shop.getLocation().distanceSquared(player.getLocation());
+                }
+            } else {
+                if (!shopsInSight.contains(shop)) {
+                    shop.getHologram().hidePlayer(player);
+                }
+            }
 
             // Display item based on distance
+            Location shopLocation = shop.getLocation();
+            if (shopLocation.getWorld().getName().equals(player.getWorld().getName())) {
+                double distSquared = shop.getLocation().distanceSquared(player.getLocation());
+
                 if (shop.hasItem()) {
-                    if (distanceSquared <= itemDistSquared) {
+                    if (distSquared <= itemDistSquared) {
                         shop.getItem().showPlayer(player);
                     } else {
                         shop.getItem().hidePlayer(player);
                     }
                 }
-
-                // Display hologram based on sight
-                if (shop.hasHologram()) {
-                    if (distanceSquared < hologramDistSquared) {
-                        Location holoLocation = shop.getHologram().getLocation();
-
-                        double x = holoLocation.getX() - pX;
-                        double y = shopLocation.getY() - pY + 1.15; // chest block + item offset
-                        double z = holoLocation.getZ() - pZ;
-
-                        // See: org.bukkit.util.Vector#angle(Vector)
-                        double angle = FastMath.acos(
-                                (x * pDir.getX() + y * pDir.getY() + z * pDir.getZ())
-                                        / (FastMath.sqrt(x * x + y * y + z * z) * dirLength)
-                        );
-
-                        double distance = FastMath.sqrt(distanceSquared);
-
-                        // Check if is targeted
-                        if (angle * distance < TARGET_THRESHOLD) {
-                            // Display even if not the nearest
-                            if (!firstShopInSight) {
-                                shop.getHologram().showPlayer(player);
-                                continue;
-                            }
-
-                            if (nearestShop == null) {
-                                // nearestShop is null
-                                // => we guess this one will be the nearest
-                                nearestShop = shop;
-                                nearestDistance = distance;
-                                continue;
-                            } else if (distance < nearestDistance) {
-                                // nearestShop is NOT null && this shop is nearest
-                                // => we'll hide nearestShop, and guess this one will be the nearest
-                                otherShopsInSight.add(nearestShop);
-                                nearestShop = shop;
-                                nearestDistance = distance;
-                                continue;
-                            } else if (nearestShop.getLocation().equals(shop.getLocation())) {
-                                // shops are the same (double chest)
-                                // => skip since it's already been handled
-                                continue;
-                            }
-                            // else: hologram is farther than nearest, so we hide it
             }
         }
 
-                    // If not in sight
+        if (nearestShop != null) {
-                    shop.getHologram().hidePlayer(player);
-                }
-            }
-        }
-
-        if (firstShopInSight) {
-            // we hide other shop as we wan't to display only the first
-            for (Shop shop : otherShopsInSight) {
-                // we already checked hasHologram() before adding it
-                shop.getHologram().hidePlayer(player);
-            }
-        }
-
-        if (nearestShop != null && nearestShop.hasHologram()) {
             nearestShop.getHologram().showPlayer(player);
         }
+
+        if (!firstShopInSight) {
+            for (Shop otherShop : shopsInSight) {
+                otherShop.getHologram().showPlayer(player);
+            }
+        }
     }
 
     private void updateNearestShops(Player p) {

src/main/resources/config.yml

@@ -16,13 +16,6 @@ language-file: "en_US"
 # Set whether the floating shop items on top of the chest should be shown
 show-shop-items: true
 
-# Set the quality (speed) for hologram and item updating.
-# Valid values are (from slowest to fastest):
-# 'SLOWEST', 'SLOWER', 'SLOW', 'NORMAL', 'FAST', 'FASTER', 'FASTEST'
-# The faster the value, the more performance will be used, which
-# may lead to TPS loss.
-update-quality: NORMAL
-
 # Set the item with which a player can click a shop to retrieve information.
 # You can set this to an empty string to disable this feature.
 shop-info-item: "STICK"