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));
                 });
@@ -266,23 +267,35 @@ 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;
 
+            if (!HologramManager.isHologramLoaded(furnace.getHologramId())) {
+                continue;
+            }
+
+            holograms.put(furnace.getHologramId(), getHologramLines(furnace));
+        }
+
+        // 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)) continue;
+        if (!(state instanceof org.bukkit.block.Furnace)) return Collections.emptyList();
 
         org.bukkit.block.Furnace furnaceBlock = ((org.bukkit.block.Furnace) state);
 
@@ -321,11 +334,7 @@ public class EpicFurnaces extends SongodaPlugin {
                 .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);
+        return Arrays.asList(progress, stats);
     }
 
     private void loadLevelManager() {

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