Look ma, no Bukkit API in the core package

common/src/main/java/com/dfsek/terra/async/AsyncBiomeFinder.java

@@ -0,0 +1,39 @@
+package com.dfsek.terra.async;
+
+import com.dfsek.terra.api.gaea.biome.Biome;
+import com.dfsek.terra.api.gaea.generation.GenerationPhase;
+import com.dfsek.terra.api.generic.TerraPlugin;
+import com.dfsek.terra.api.generic.world.vector.Location;
+import com.dfsek.terra.api.generic.world.vector.Vector3;
+import com.dfsek.terra.biome.grid.master.TerraBiomeGrid;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.function.Consumer;
+
+/**
+ * Runnable that locates a biome asynchronously
+ */
+public class AsyncBiomeFinder extends AsyncFeatureFinder<Biome> {
+
+    public AsyncBiomeFinder(TerraBiomeGrid grid, Biome target, @NotNull Location origin, int startRadius, int maxRadius, Consumer<Vector3> callback, TerraPlugin main) {
+        super(grid, target, origin, startRadius, maxRadius, callback, main);
+    }
+
+    /**
+     * Helper method to get biome at location
+     *
+     * @param x X coordinate
+     * @param z Z coordinate
+     * @return Biome at coordinates
+     */
+    @Override
+    public boolean isValid(int x, int z, Biome target) {
+        int res = main.getTerraConfig().getBiomeSearchResolution();
+        return getGrid().getBiome(x * res, z * res, GenerationPhase.POST_GEN).equals(target);
+    }
+
+    @Override
+    public Vector3 finalizeVector(Vector3 orig) {
+        return orig.multiply(main.getTerraConfig().getBiomeSearchResolution());
+    }
+}

common/src/main/java/com/dfsek/terra/async/AsyncFeatureFinder.java

@@ -0,0 +1,97 @@
+package com.dfsek.terra.async;
+
+import com.dfsek.terra.api.generic.TerraPlugin;
+import com.dfsek.terra.api.generic.world.World;
+import com.dfsek.terra.api.generic.world.vector.Location;
+import com.dfsek.terra.api.generic.world.vector.Vector3;
+import com.dfsek.terra.biome.grid.master.TerraBiomeGrid;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.function.Consumer;
+
+public abstract class AsyncFeatureFinder<T> implements Runnable {
+    protected final TerraBiomeGrid grid;
+    protected final T target;
+    protected final int startRadius;
+    protected final int maxRadius;
+    protected final int centerX;
+    protected final int centerZ;
+    protected final World world;
+    private final Consumer<Vector3> callback;
+    protected int searchSize = 1;
+    protected final TerraPlugin main;
+
+    public AsyncFeatureFinder(TerraBiomeGrid grid, T target, @NotNull Location origin, int startRadius, int maxRadius, Consumer<Vector3> callback, TerraPlugin main) {
+        this.grid = grid;
+        this.target = target;
+        this.main = main;
+        this.startRadius = startRadius;
+        this.maxRadius = maxRadius;
+        this.centerX = origin.getBlockX();
+        this.centerZ = origin.getBlockZ();
+        this.world = origin.getWorld();
+        this.callback = callback;
+    }
+
+    @Override
+    public void run() {
+        int x = centerX;
+        int z = centerZ;
+
+        x /= searchSize;
+        z /= searchSize;
+
+        int run = 1;
+        boolean toggle = true;
+        boolean found = false;
+
+        main:
+        for(int i = startRadius; i < maxRadius; i++) {
+            for(int j = 0; j < run; j++) {
+                if(isValid(x, z, target)) {
+                    found = true;
+                    break main;
+                }
+                if(toggle) x += 1;
+                else x -= 1;
+            }
+            for(int j = 0; j < run; j++) {
+                if(isValid(x, z, target)) {
+                    found = true;
+                    break main;
+                }
+                if(toggle) z += 1;
+                else z -= 1;
+            }
+            run++;
+            toggle = !toggle;
+        }
+        Vector3 finalSpawn = found ? finalizeVector(new Vector3(x, 0, z)) : null;
+        callback.accept(finalSpawn);
+    }
+
+
+    public abstract Vector3 finalizeVector(Vector3 orig);
+
+    public abstract boolean isValid(int x, int z, T target);
+
+    public T getTarget() {
+        return target;
+    }
+
+    public World getWorld() {
+        return world;
+    }
+
+    public TerraBiomeGrid getGrid() {
+        return grid;
+    }
+
+    public int getSearchSize() {
+        return searchSize;
+    }
+
+    public void setSearchSize(int searchSize) {
+        this.searchSize = searchSize;
+    }
+}