Update for the new HologramManager changes.

src/main/java/com/songoda/epicfurnaces/EpicFurnaces.java

@@ -226,6 +226,7 @@ public class EpicFurnaces extends SongodaPlugin {
                 }
 
                 this.dataManager.getFurnaces((furnaces) -> {
+                    furnaces.values().forEach(Furnace::createHologram);
                     this.furnaceManager.addFurnaces(furnaces.values());
                     this.dataManager.getBoosts((boosts) -> this.boostManager.addBoosts(boosts));
                 });
@@ -266,68 +267,76 @@ public class EpicFurnaces extends SongodaPlugin {
     }
 
     public void clearHologram(Furnace furnace) {
-        HologramManager.removeHologram(furnace.getLocation().add(0, .15, 0));
+        furnace.removeHologram();
     }
 
     public void updateHolograms(Collection<Furnace> furnaces) {
         // are holograms enabled?
         if (!Settings.HOLOGRAMS.getBoolean() || !HologramManager.getManager().isEnabled()) return;
 
-        Map<Location, List<String>> holograms = new HashMap<>(furnaces.size());
+        Map<String, List<String>> holograms = new HashMap<>(furnaces.size());
 
         for (Furnace furnace : furnaces) {
             // don't try to load furnaces in chunks that aren't loaded
             if (!furnace.isInLoadedChunk()) continue;
 
-            BlockState state = furnace.getLocation().getBlock().getState();
+            if (!HologramManager.isHologramLoaded(furnace.getHologramId())) {
-
+                continue;
-            // verify that this is a furnace
-            if (!(state instanceof org.bukkit.block.Furnace)) continue;
-
-            org.bukkit.block.Furnace furnaceBlock = ((org.bukkit.block.Furnace) state);
-
-            int performance = (furnaceBlock.getCookTime() - furnace.getPerformanceTotal(furnaceBlock.getType())) <= 0 ? 0 : furnace.getPerformanceTotal(furnaceBlock.getType());
-            float percent = (float) (furnaceBlock.getCookTime() - performance) / (200 - performance);
-
-            int progressBars = (int) (6 * percent) + (percent == 0 ? 0 : 1);
-            int leftOver = (6 - progressBars);
-
-            String progress;
-
-            if (furnaceBlock.getInventory().getFuel() != null) {
-                StringBuilder sb = new StringBuilder();
-                for (int i = 0; i < progressBars; i++) {
-                    sb.append("&a=");
-                }
-                for (int i = 0; i < leftOver; i++) {
-                    sb.append("&c=");
-                }
-
-                progress = Methods.formatText(sb.toString());
-            } else {
-                progress = getLocale().getMessage("general.hologram.outoffuel").getMessage();
             }
 
-            int inAmt = 0;
+            holograms.put(furnace.getHologramId(), getHologramLines(furnace));
-            int outAmt = 0;
-            if (furnaceBlock.getInventory().getSmelting() != null) {
-                inAmt = furnaceBlock.getInventory().getSmelting().getAmount();
-            }
-            if (furnaceBlock.getInventory().getResult() != null) {
-                outAmt = furnaceBlock.getInventory().getResult().getAmount();
-            }
-
-            String stats = getLocale().getMessage("general.hologram.stats")
-                    .processPlaceholder("in", inAmt)
-                    .processPlaceholder("out", Math.min(outAmt, 64)).getMessage();
-
-            holograms.put(furnace.getLocation().add(0, .15, 0), Arrays.asList(progress, stats));
         }
 
         // Update holograms
         HologramManager.bulkUpdateHolograms(holograms);
     }
 
+    public List<String> getHologramLines(Furnace furnace) {
+        BlockState state = furnace.getLocation().getBlock().getState();
+
+        // verify that this is a furnace
+        if (!(state instanceof org.bukkit.block.Furnace)) return Collections.emptyList();
+
+        org.bukkit.block.Furnace furnaceBlock = ((org.bukkit.block.Furnace) state);
+
+        int performance = (furnaceBlock.getCookTime() - furnace.getPerformanceTotal(furnaceBlock.getType())) <= 0 ? 0 : furnace.getPerformanceTotal(furnaceBlock.getType());
+        float percent = (float) (furnaceBlock.getCookTime() - performance) / (200 - performance);
+
+        int progressBars = (int) (6 * percent) + (percent == 0 ? 0 : 1);
+        int leftOver = (6 - progressBars);
+
+        String progress;
+
+        if (furnaceBlock.getInventory().getFuel() != null) {
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < progressBars; i++) {
+                sb.append("&a=");
+            }
+            for (int i = 0; i < leftOver; i++) {
+                sb.append("&c=");
+            }
+
+            progress = Methods.formatText(sb.toString());
+        } else {
+            progress = getLocale().getMessage("general.hologram.outoffuel").getMessage();
+        }
+
+        int inAmt = 0;
+        int outAmt = 0;
+        if (furnaceBlock.getInventory().getSmelting() != null) {
+            inAmt = furnaceBlock.getInventory().getSmelting().getAmount();
+        }
+        if (furnaceBlock.getInventory().getResult() != null) {
+            outAmt = furnaceBlock.getInventory().getResult().getAmount();
+        }
+
+        String stats = getLocale().getMessage("general.hologram.stats")
+                .processPlaceholder("in", inAmt)
+                .processPlaceholder("out", Math.min(outAmt, 64)).getMessage();
+
+        return Arrays.asList(progress, stats);
+    }
+
     private void loadLevelManager() {
         if (!levelsFile.getFile().exists())
             this.saveResource("levels.yml", false);

src/main/java/com/songoda/epicfurnaces/furnace/Furnace.java

@@ -4,6 +4,7 @@ import com.songoda.core.compatibility.CompatibleMaterial;
 import com.songoda.core.compatibility.ServerVersion;
 import com.songoda.core.gui.GuiManager;
 import com.songoda.core.hooks.EconomyManager;
+import com.songoda.core.hooks.HologramManager;
 import com.songoda.core.math.MathUtils;
 import com.songoda.core.hooks.ProtectionManager;
 import com.songoda.epicfurnaces.EpicFurnaces;
@@ -42,6 +43,11 @@ public class Furnace {
 
     private final EpicFurnaces plugin = EpicFurnaces.getInstance();
 
+    // This is the unique identifier for this furnace.
+    // It is reset on every plugin load.
+    // Used for holograms.
+    private final UUID uniqueId = UUID.randomUUID();
+
     // Identifier for database use.
     private int id;
 
@@ -402,4 +408,16 @@ public class Furnace {
         if (result != null)
             world.dropItemNaturally(location, result);
     }
+
+    public String getHologramId() {
+        return "EpicFurnaces-" + uniqueId;
+    }
+
+    public void createHologram() {
+        HologramManager.createHologram(getHologramId(), getLocation().add(0, 0.15, 0), plugin.getHologramLines(this));
+    }
+
+    public void removeHologram() {
+        HologramManager.removeHologram(getHologramId());
+    }
 }

src/main/java/com/songoda/epicfurnaces/listeners/BlockListeners.java

@@ -18,7 +18,6 @@ import org.bukkit.event.block.BlockFormEvent;
 import org.bukkit.event.block.BlockPlaceEvent;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.Collections;
 import java.util.List;
 
 /**
@@ -90,10 +89,10 @@ public class BlockListeners implements Listener {
                 .setPlacedBy(event.getPlayer().getUniqueId()).build()
                 : new FurnaceBuilder(location).setPlacedBy(event.getPlayer().getUniqueId()).build();
 
-        plugin.getFurnaceManager().addFurnace(furnace);
         plugin.getDataManager().createFurnace(furnace);
+        plugin.getFurnaceManager().addFurnace(furnace);
 
-        plugin.updateHolograms(Collections.singleton(furnace));
+        furnace.createHologram();
     }
 
     @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)

src/main/resources/plugin.yml

@@ -1,7 +1,7 @@
 name: EpicFurnaces
 description: EpicFurnaces
 version: maven-version-number
-softdepend: [ FabledSkyBlock, HolographicDisplays, PlotSquared, GriefPrevention, USkyBlock, SkyBlock, WorldGuard, Factions, Lands, RedProtect, UltimateClaims, BentoBox, Vault ]
+softdepend: [ FabledSkyBlock, HolographicDisplays, PlotSquared, GriefPrevention, USkyBlock, SkyBlock, WorldGuard, Factions, Lands, RedProtect, UltimateClaims, BentoBox, Vault, DecentHolograms ]
 main: com.songoda.epicfurnaces.EpicFurnaces
 author: songoda
 api-version: 1.13