Fixes bug where animals spawn too much in greenhouses.

Also tracks island deletion so greenhouses are removed when that
happens.

src/main/java/world/bentobox/greenhouses/Greenhouses.java

@@ -66,7 +66,7 @@ public class Greenhouses extends Addon {
     public void onDisable() {
         if (manager != null) {
             manager.saveGreenhouses();
-            manager.getEcoMgr().cancel();
+            if (manager.getEcoMgr() != null) manager.getEcoMgr().cancel();
         }
         if (settings != null) {
             new Config<>(this, Settings.class).saveConfigObject(settings);

src/main/java/world/bentobox/greenhouses/listeners/IslandChangeEvents.java

@@ -0,0 +1,29 @@
+package world.bentobox.greenhouses.listeners;
+
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+import world.bentobox.bentobox.api.events.island.IslandEvent.IslandDeleteEvent;
+import world.bentobox.greenhouses.Greenhouses;
+
+/**
+ * @author tastybento
+ *
+ */
+public class IslandChangeEvents implements Listener {
+
+    private Greenhouses addon;
+
+    /**
+     * @param addon
+     */
+    public IslandChangeEvents(Greenhouses addon) {
+        this.addon = addon;
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled=true)
+    public void onIslandDeleteEvent(IslandDeleteEvent e) {
+        addon.getManager().removeGreenhouses(e.getIsland());
+    }
+}

src/main/java/world/bentobox/greenhouses/managers/EcoSystemManager.java

@@ -13,6 +13,7 @@ import org.bukkit.block.Hopper;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.scheduler.BukkitTask;
 
+import world.bentobox.bentobox.util.Pair;
 import world.bentobox.greenhouses.Greenhouses;
 import world.bentobox.greenhouses.data.Greenhouse;
 
@@ -91,19 +92,33 @@ public class EcoSystemManager {
             return;
         }
         // Count mobs in greenhouse
+        // Load chunks
+        List<Pair<Integer, Integer>> chunks = new ArrayList<>();
+        for (double blockX = gh.getBoundingBox().getMinX(); blockX < gh.getBoundingBox().getMaxX(); blockX+=16) {
+            for (double blockZ = gh.getBoundingBox().getMinZ(); blockZ < gh.getBoundingBox().getMaxZ(); blockZ+=16) {
+                int chunkX = (int)(blockX / 16);
+                int chunkZ = (int)(blockZ / 16);
+                if (!gh.getWorld().isChunkLoaded(chunkX, chunkZ)) {
+                    gh.getWorld().loadChunk(chunkX, chunkZ);
+                    chunks.add(new Pair<>(chunkX, chunkZ));
+                }
+            }
+        }
         long sum = gh.getWorld().getEntities().stream()
                 .filter(e -> gh.getBiomeRecipe().getMobTypes().contains(e.getType()))
                 .filter(e -> gh.contains(e.getLocation())).count();
         // Get the blocks in the greenhouse where spawning could occur
         Iterator<Block> it = getAvailableBlocks(gh).iterator();
         // Check if the greenhouse is full
-        while (it.hasNext() && (sum == 0 || gh.getArea() / sum > gh.getBiomeRecipe().getMobLimit())) {
+        while (it.hasNext() && (sum == 0 || gh.getArea() / sum >= gh.getBiomeRecipe().getMobLimit())) {
             // Spawn something if chance says so
             if (gh.getBiomeRecipe().spawnMob(it.next())) {
                 // Add a mob to the sum in the greenhouse
                 sum++;
             }
         }
+        // Unload chunks again
+        chunks.forEach(p -> gh.getWorld().unloadChunk(p.x, p.z));
     }
 
     /**

src/main/java/world/bentobox/greenhouses/managers/GreenhouseManager.java

@@ -12,11 +12,13 @@ import org.bukkit.event.Listener;
 
 import world.bentobox.bentobox.api.events.BentoBoxReadyEvent;
 import world.bentobox.bentobox.database.Database;
+import world.bentobox.bentobox.database.objects.Island;
 import world.bentobox.greenhouses.Greenhouses;
 import world.bentobox.greenhouses.data.Greenhouse;
 import world.bentobox.greenhouses.greenhouse.BiomeRecipe;
 import world.bentobox.greenhouses.listeners.GreenhouseEvents;
 import world.bentobox.greenhouses.listeners.GreenhouseGuard;
+import world.bentobox.greenhouses.listeners.IslandChangeEvents;
 import world.bentobox.greenhouses.listeners.SnowTracker;
 
 public class GreenhouseManager implements Listener {
@@ -70,6 +72,7 @@ public class GreenhouseManager implements Listener {
         addon.registerListener(new SnowTracker(addon));
         addon.registerListener(new GreenhouseEvents(addon));
         addon.registerListener(new GreenhouseGuard(addon));
+        addon.registerListener(new IslandChangeEvents(addon));
     }
 
     public GreenhouseMap getMap() {
@@ -245,4 +248,14 @@ public class GreenhouseManager implements Listener {
     public EcoSystemManager getEcoMgr() {
         return ecoMgr;
     }
+
+    /**
+     * Removes all greenhouses on island
+     * @param island - island
+     */
+    public void removeGreenhouses(Island island) {
+        map.getGreenhouses(island).forEach(handler::deleteObject);
+        map.removeGreenhouses(island);
+
+    }
 }

src/main/java/world/bentobox/greenhouses/managers/GreenhouseMap.java

@@ -1,6 +1,7 @@
 package world.bentobox.greenhouses.managers;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -100,11 +101,18 @@ public class GreenhouseMap {
      */
     protected void removeGreenhouse(Greenhouse greenhouse) {
         addon.getIslands().getIslandAt(greenhouse.getLocation()).ifPresent(i -> {
-            greenhouses.putIfAbsent(i, new ArrayList<>());
-            greenhouses.get(i).remove(greenhouse);
+            if (greenhouses.containsKey(i)) greenhouses.get(i).remove(greenhouse);
         });
     }
 
+    /**
+     * @param island
+     */
+    public void removeGreenhouses(Island island) {
+        greenhouses.remove(island);
+    }
+
+
     /**
      * @return a list of all the Greenhouses
      */
@@ -112,6 +120,15 @@ public class GreenhouseMap {
         return greenhouses.values().stream().flatMap(List::stream).collect(Collectors.toList());
     }
 
+    /**
+     * Get all greenhouses on island
+     * @param island - island
+     * @return list of islands or empty list
+     */
+    public List<Greenhouse> getGreenhouses(Island island) {
+        return greenhouses.getOrDefault(island, Collections.emptyList());
+    }
+
     /**
      * @return number of greenhouses loaded
      */

src/main/resources/biomes.yml

@@ -178,7 +178,7 @@ biomes:
       TALL_GRASS: 10:GRASS_BLOCK
     mobs:
       HORSE: 10:GRASS_BLOCK
-    moblimit: 9
+    moblimit: 1
   RIVER:
     friendlyname: "Clay river"
     biome: RIVER