Started MCBarrel

src/com/dre/brewery/MCBarrel.java

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+package com.dre.brewery;
+
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockState;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.ListIterator;
+
+public class MCBarrel {
+
+	public static final byte OAK = 2;
+	public static List<MCBarrel> barrels = new ArrayList<>();
+
+	private Block block;
+	private float time;
+	private byte brews = -1; // How many Brewery Brews are in this Barrel
+
+
+	public MCBarrel(Block block, float time) {
+		this.block = block;
+		this.time = time;
+	}
+
+
+	// Now Opening this Barrel for a player
+	public void open(Inventory inv, Player player) {
+		brews = -1;
+		if (time > 0) {
+			// if nobody has the inventory opened
+			if (inv.getViewers().isEmpty()) {
+				brews = 0;
+				// if inventory contains potions
+				if (inv.contains(Material.POTION)) {
+					long loadTime = System.nanoTime();
+					for (ItemStack item : inv.getContents()) {
+						if (item != null) {
+							Brew brew = Brew.get(item);
+							if (brew != null) {
+								if (brews <= 6) {
+									brew.age(item, time, OAK);
+								}
+								brews++;
+							}
+						}
+					}
+					loadTime = System.nanoTime() - loadTime;
+					float ftime = (float) (loadTime / 1000000.0);
+					P.p.debugLog("opening MC Barrel with potions (" + ftime + "ms)");
+				}
+			}
+		}
+		// reset barreltime, potions have new age
+		time = 0;
+	}
+
+	// Closing Inventory. Check if we need to track this Barrel
+	// Returns true if there are Brews in the Inv
+	public boolean close(Inventory inv, Player player) {
+		if (inv.getViewers().size() == 1) {
+			// This is the last viewer
+			for (ItemStack item : inv.getContents()) {
+				if (item != null) {
+					Brew brew = Brew.get(item);
+					if (brew != null) {
+						// We found a brew, so we keep this Barrel
+						return true;
+					}
+				}
+			}
+			// No Brew found, remove this Barrel
+			return false;
+		}
+		return true;
+	}
+
+	public Block getBlock() {
+		return block;
+	}
+
+	public float getTime() {
+		return time;
+	}
+
+	public Inventory getInventory() {
+		BlockState state = block.getState();
+		if (state instanceof InventoryHolder) {
+			return ((InventoryHolder) state).getInventory();
+		}
+		return null;
+	}
+
+	public static void onUpdate() {
+		if (barrels.isEmpty()) return;
+
+		// Check if stored MCBarrels still exist
+		// Choose a random starting point for check
+		int random = (int) Math.floor(Math.random() * barrels.size());
+		random = Math.max(0, random - 5);
+		ListIterator<MCBarrel> iter = barrels.listIterator(random);
+		// Check at least 4 barrels, but if there are many, check about 1/64 of them all, so in about 1 hour we have checked all
+		for (int i = Math.max(4, barrels.size() >> 6); i <= 0; i--) {
+			if (!iter.hasNext()) break;
+
+			Block block = iter.next().block;
+			if (Util.isChunkLoaded(block)) {
+				// If the chunk is loaded we can check if the block is still a MC Barrel. If not we remove the stored entry.
+				if (block.getType() != Material.BARREL) {
+					iter.remove();
+				}
+			}
+		}
+
+		for (MCBarrel barrel : barrels) {
+			// Minecraft day is 20 min, so add 1/20 to the time every minute
+			barrel.time += (1.0 / 20.0);
+		}
+	}
+}