Paper/CraftBukkit-Patches/0146-Alternative-Hopper-Ticking.patch

From ee57713dd00e22d5629a29410922ed293163e3fe Mon Sep 17 00:00:00 2001
From: "Evan A. Haskell" <eah2119@gmail.com>
Date: Sat, 19 Apr 2014 16:58:26 -0400
Subject: [PATCH] Alternative Hopper Ticking


diff --git a/src/main/java/net/minecraft/server/BlockHopper.java b/src/main/java/net/minecraft/server/BlockHopper.java
index 9e64702..e1e626b 100644
--- a/src/main/java/net/minecraft/server/BlockHopper.java
+++ b/src/main/java/net/minecraft/server/BlockHopper.java
@@ -87,6 +87,17 @@ public class BlockHopper extends BlockContainer {
 
         if (flag != flag1) {
             world.setData(i, j, k, i1 | (flag ? 0 : 8), 4);
+            // Spigot start - When this hopper becomes unpowered, make it active.
+            // Called when this block's power level changes. flag1 is the current
+            // isNotPowered from metadata. flag is the recalculated isNotPowered.
+            if (world.spigotConfig.altHopperTicking) {
+            	// e returns the TileEntityHopper associated with this BlockHopper.
+                TileEntityHopper hopper = e((IBlockAccess) world, i, j, k);
+                if (flag && hopper != null) {
+                    hopper.makeTick();
+                }
+            }
+            // Spigot end
         }
     }
 
@@ -163,4 +174,17 @@ public class BlockHopper extends BlockContainer {
     public static TileEntityHopper e(IBlockAccess iblockaccess, int i, int j, int k) {
         return (TileEntityHopper) iblockaccess.getTileEntity(i, j, k);
     }
+
+    // Spigot start - Use random block updates to make hoppers active.
+    @Override
+    public void a(World world, int i, int j, int k, Random random) {
+        if (world.spigotConfig.altHopperTicking) {
+        	// e returns the TileEntityHopper associated with this BlockHopper.
+            TileEntityHopper hopper = e((IBlockAccess) world, i, j, k);
+            if (hopper != null) {
+                hopper.makeTick();
+            }
+        }
+    }
+    // Spigot end
 }
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 2c95832..b5014b0 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -722,6 +722,11 @@ public class Chunk {
 
             tileentity.t();
             this.tileEntities.put(chunkposition, tileentity);
+            // Spigot start - The tile entity has a world, now hoppers can be born ticking.
+            if (this.world.spigotConfig.altHopperTicking) {
+                this.world.triggerHoppersList.add(tileentity);
+            }
+            // Spigot end
             // CraftBukkit start
         } else {
             System.out.println("Attempted to place a tile entity (" + tileentity + ") at " + tileentity.x + "," + tileentity.y + "," + tileentity.z
diff --git a/src/main/java/net/minecraft/server/EntityItem.java b/src/main/java/net/minecraft/server/EntityItem.java
index 5eb893f..6dfedc0 100644
--- a/src/main/java/net/minecraft/server/EntityItem.java
+++ b/src/main/java/net/minecraft/server/EntityItem.java
@@ -102,6 +102,27 @@ public class EntityItem extends Entity {
             if (this.onGround) {
                 this.motY *= -0.5D;
             }
+            // Spigot start - Make the hopper(s) below this item active.
+            // Called each tick on each item entity.
+            if (this.world.spigotConfig.altHopperTicking) {
+                int xi = MathHelper.floor(this.boundingBox.a);
+                int yi = MathHelper.floor(this.boundingBox.b) - 1;
+                int zi = MathHelper.floor(this.boundingBox.c);
+                int xf = MathHelper.floor(this.boundingBox.d);
+                int yf = MathHelper.floor(this.boundingBox.e) - 1;
+                int zf = MathHelper.floor(this.boundingBox.f);
+                for (int a = xi; a <= xf; a++) {
+                    for (int c = zi; c <= zf; c++) {
+                        for (int b = yi; b <= yf; b++) {
+                            TileEntity tileEntity = this.world.getTileEntity(a, b, c);
+                            if (tileEntity instanceof TileEntityHopper) {
+                                ((TileEntityHopper) tileEntity).makeTick();
+                            }
+                        }
+                    }
+                }
+            }
+            // Spigot end
 
             // ++this.age; // CraftBukkit - Moved up
             if (!this.world.isStatic && this.age >= world.spigotConfig.itemDespawnRate) { // Spigot
diff --git a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
index 166206c..de60840 100644
--- a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
+++ b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
@@ -342,6 +342,27 @@ public abstract class EntityMinecartAbstract extends Entity {
 
                 this.passenger = null;
             }
+            // Spigot start - Make hoppers around this container minecart active.
+            // Called each tick on each minecart.
+            if (this.world.spigotConfig.altHopperTicking && this instanceof EntityMinecartContainer) {
+                int xi = MathHelper.floor(this.boundingBox.a) - 1;
+                int yi = MathHelper.floor(this.boundingBox.b) - 1;
+                int zi = MathHelper.floor(this.boundingBox.c) - 1;
+                int xf = MathHelper.floor(this.boundingBox.d) + 1;
+                int yf = MathHelper.floor(this.boundingBox.e) + 1;
+                int zf = MathHelper.floor(this.boundingBox.f) + 1;
+                for (int a = xi; a <= xf; a++) {
+                    for (int b = yi; b <= yf; b++) {
+                        for (int c = zi; c <= zf; c++) {
+                            TileEntity tileEntity = this.world.getTileEntity(a, b, c);
+                            if (tileEntity instanceof TileEntityHopper) {
+                                ((TileEntityHopper) tileEntity).makeTick();
+                            }
+                        }
+                    }
+                }
+            }
+            // Spigot end
         }
     }
 
diff --git a/src/main/java/net/minecraft/server/EntityOcelot.java b/src/main/java/net/minecraft/server/EntityOcelot.java
index 1ce9fb8..b3e6ec8 100644
--- a/src/main/java/net/minecraft/server/EntityOcelot.java
+++ b/src/main/java/net/minecraft/server/EntityOcelot.java
@@ -27,6 +27,31 @@ public class EntityOcelot extends EntityTameableAnimal {
         this.datawatcher.a(18, Byte.valueOf((byte) 0));
     }
 
+    // Spigot start - When this ocelot begins standing, chests below this ocelot must be
+    // updated as if its contents have changed. We update chests if this ocelot is sitting
+    // knowing that it may be dead, gone, or standing after this method returns.
+    // Called each tick on each ocelot.
+    @Override
+    public void h() {
+        if (this.world.spigotConfig.altHopperTicking && this.isSitting()) {
+            int xi = MathHelper.floor(this.boundingBox.a);
+            int yi = MathHelper.floor(this.boundingBox.b) - 1;
+            int zi = MathHelper.floor(this.boundingBox.c);
+            int xf = MathHelper.floor(this.boundingBox.d);
+            int yf = MathHelper.floor(this.boundingBox.e) - 1;
+            int zf = MathHelper.floor(this.boundingBox.f);
+            for (int a = xi; a <= xf; a++) {
+                for (int c = zi; c <= zf; c++) {
+                    for (int b = yi; b <= yf; b++) {
+                        this.world.updateChestAndHoppers(a, b, c);
+                    }
+                }
+            }
+        }
+        super.h();
+    }
+    // Spigot end
+
     public void bo() {
         if (this.getControllerMove().a()) {
             double d0 = this.getControllerMove().b();
diff --git a/src/main/java/net/minecraft/server/TileEntity.java b/src/main/java/net/minecraft/server/TileEntity.java
index 19d008c..c5859e5 100644
--- a/src/main/java/net/minecraft/server/TileEntity.java
+++ b/src/main/java/net/minecraft/server/TileEntity.java
@@ -24,6 +24,40 @@ public class TileEntity {
     public int g = -1;
     public Block h;
 
+    // Spigot start
+    // Helper method for scheduleTicks. If the hopper at x0, y0, z0 is pointed
+    // at this tile entity, then make it active.
+    private void scheduleTick(int x0, int y0, int z0) {
+        TileEntity tileEntity = this.world.getTileEntity(x0, y0, z0);
+        if (tileEntity instanceof TileEntityHopper && tileEntity.world != null) {
+            // i is the metadeta assoiated with the direction the hopper faces.
+            int i = BlockHopper.b(tileEntity.p());
+            // Facing class provides arrays for direction offset.
+            if (tileEntity.x + Facing.b[i] == this.x && tileEntity.y + Facing.c[i] == this.y && tileEntity.z + Facing.d[i] == this.z) {
+                ((TileEntityHopper) tileEntity).makeTick();
+            }
+        }
+    }
+    
+    // Called from update when the contents have changed, so hoppers need updates.
+    // Check all 6 faces.
+    public void scheduleTicks() {
+        if (this.world != null && this.world.spigotConfig.altHopperTicking) {
+            // Check the top
+            this.scheduleTick(this.x, this.y + 1, this.z);
+            // Check the sides
+            for (int i = 2; i < 6; i++) {
+                this.scheduleTick(this.x + Facing.b[i], this.y, this.z + Facing.d[i]);
+            }
+            // Check the bottom.
+            TileEntity tileEntity = this.world.getTileEntity(this.x, this.y - 1, this.z);
+            if (tileEntity instanceof TileEntityHopper && tileEntity.world != null) {
+                ((TileEntityHopper) tileEntity).makeTick();
+            }
+        }
+    }
+    // Spigot end
+
     public TileEntity() {}
 
     private static void a(Class oclass, String s) {
@@ -105,6 +139,10 @@ public class TileEntity {
             if (this.q() != Blocks.AIR) {
                 this.world.f(this.x, this.y, this.z, this.q());
             }
+            // Spigot start - Called when the contents have changed, so hoppers around this
+            // tile need updating.
+            this.scheduleTicks();
+            // Spigot end
         }
     }
 
diff --git a/src/main/java/net/minecraft/server/TileEntityHopper.java b/src/main/java/net/minecraft/server/TileEntityHopper.java
index b620394..c7b3495 100644
--- a/src/main/java/net/minecraft/server/TileEntityHopper.java
+++ b/src/main/java/net/minecraft/server/TileEntityHopper.java
@@ -17,6 +17,43 @@ public class TileEntityHopper extends TileEntity implements IHopper {
     private String i;
     private int j = -1;
 
+    // Spigot start
+    private long nextTick = -1; // Next tick this hopper will be ticked.
+    private long lastTick = -1; // Last tick this hopper was polled.
+    
+    // If this hopper is not cooling down, assaign a visible tick for next time.
+    public void makeTick() {
+        if (!this.j()) {
+            this.c(0);
+        }
+    }
+    
+    // Contents changed, so make this hopper active.
+    public void scheduleHopperTick() {
+        if (this.world != null && this.world.spigotConfig.altHopperTicking) {
+            this.makeTick();
+        }
+    }
+    
+	// Called after this hopper is assaigned a world or when altHopperTicking is turned
+	// on from reload.
+    public void convertToScheduling() {
+    	// j is the cooldown in ticks
+        this.c(this.j);
+    }
+    
+    // Called when alt hopper ticking is turned off from the reload command
+    public void convertToPolling() {
+        long cooldownDiff;
+        if (this.lastTick == this.world.getTime()) {
+            cooldownDiff = this.nextTick - this.world.getTime();
+        } else {
+            cooldownDiff = this.nextTick - this.world.getTime() + 1;
+        }
+        this.c((int) Math.max(0, Math.min(cooldownDiff, Integer.MAX_VALUE)));
+    }
+    // Spigot end
+
     // CraftBukkit start - add fields and methods
     public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
     private int maxStack = MAX_STACK;
@@ -80,7 +117,20 @@ public class TileEntityHopper extends TileEntity implements IHopper {
         }
 
         nbttagcompound.set("Items", nbttaglist);
-        nbttagcompound.setInt("TransferCooldown", this.j);
+        // Spigot start - Need to write the correct cooldown to disk. We convert from long to int on saving.
+        if (this.world != null && this.world.spigotConfig.altHopperTicking) {
+            long cooldownDiff;
+            if (this.lastTick == this.world.getTime()) {
+                cooldownDiff = this.nextTick - this.world.getTime();
+            } else {
+                cooldownDiff = this.nextTick - this.world.getTime() + 1;
+            }
+            nbttagcompound.setInt("TransferCooldown", (int) Math.max(0, Math.min(cooldownDiff, Integer.MAX_VALUE)));
+        } else {
+        	// j is the cooldown in ticks.
+            nbttagcompound.setInt("TransferCooldown", this.j);
+        }
+        // Spigot end
         if (this.k_()) {
             nbttagcompound.setString("CustomName", this.i);
         }
@@ -88,6 +138,9 @@ public class TileEntityHopper extends TileEntity implements IHopper {
 
     public void update() {
         super.update();
+        // Spigot start - The contents have changed, so make this hopper active.
+        this.scheduleHopperTick();
+        // Spigot end
     }
 
     public int getSize() {
@@ -167,11 +220,21 @@ public class TileEntityHopper extends TileEntity implements IHopper {
 
     public void h() {
         if (this.world != null && !this.world.isStatic) {
-            --this.j;
-            if (!this.j()) {
-                this.c(0);
-                this.i();
+            // Spigot start
+            if (this.world.spigotConfig.altHopperTicking) {
+                this.lastTick = this.world.getTime();
+                if (this.nextTick == this.world.getTime()) {
+                	// Method that does the pushing and pulling.
+                    this.i();
+                }
+            } else {
+                --this.j;
+                if (!this.j()) {
+                    this.c(0);
+                    this.i();
+                }
             }
+            // Spigot end
         }
     }
 
@@ -196,7 +259,7 @@ public class TileEntityHopper extends TileEntity implements IHopper {
             }
 
             // Spigot start
-            if ( !this.j() )
+            if ( !world.spigotConfig.altHopperTicking && !this.j() )
             {
                 this.c( world.spigotConfig.hopperCheck );
             }
@@ -584,10 +647,34 @@ public class TileEntityHopper extends TileEntity implements IHopper {
     }
 
     public void c(int i) {
-        this.j = i;
+        // Spigot start - i is the delay for which this hopper will be ticked next.
+        // i of 1 or below implies a tick next tick.
+        if (this.world != null && this.world.spigotConfig.altHopperTicking) {
+            if (i <= 0) {
+                i = 1;
+            }
+            if (this.lastTick == this.world.getTime()) {
+                this.nextTick = this.world.getTime() + i;
+            } else {
+                this.nextTick = this.world.getTime() + i - 1;
+            }
+        } else {
+            this.j = i;
+        }
+        // Spigot end
     }
 
     public boolean j() {
-        return this.j > 0;
+        // Spigot start - Return whether this hopper is cooling down.
+        if (this.world != null && this.world.spigotConfig.altHopperTicking) {
+            if (this.lastTick == this.world.getTime()) {
+                return this.nextTick > this.world.getTime();
+            } else {
+                return this.nextTick >= this.world.getTime();
+            }
+        } else {
+            return this.j > 0;
+        }
+        // Spigot end
     }
 }
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index a879ae3..a2fa854 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -113,6 +113,7 @@ public abstract class World implements IBlockAccess {
     private final byte chunkTickRadius;
     public static boolean haveWeSilencedAPhysicsCrash;
     public static String blockLocation;
+    public List<TileEntity> triggerHoppersList = new ArrayList<TileEntity>(); // Spigot, When altHopperTicking, tile entities being added go through here.
 
     public static long chunkToKey(int x, int z)
     {
@@ -130,6 +131,42 @@ public abstract class World implements IBlockAccess {
     {
         return (int) ( ( ( k >> 32 ) & 0xFFFF0000L ) | ( ( k >> 16 ) & 0x0000FFFF ) );
     }
+
+    // Spigot Start - Hoppers need to be born ticking.
+    private void initializeHoppers() {
+        if (this.spigotConfig.altHopperTicking) {
+            for (TileEntity o : this.triggerHoppersList) {
+                o.scheduleTicks();
+                if (o instanceof TileEntityHopper) {
+                    ((TileEntityHopper) o).convertToScheduling();
+                    ((TileEntityHopper) o).scheduleHopperTick();
+                }
+            }
+        }
+        triggerHoppersList.clear();
+    }
+    
+    // Helper method for altHopperTicking. Updates chests at the specified location,
+    // accounting for double chests. Updating the chest will update adjacent hoppers.
+    public void updateChestAndHoppers(int a, int b, int c) {
+        Block block = this.getType(a, b, c);
+        if (block instanceof BlockChest) {
+            TileEntity tile = this.getTileEntity(a, b, c);
+            if (tile instanceof TileEntityChest) {
+                tile.scheduleTicks();
+            }
+            for (int i = 2; i < 6; i++) {
+            	// Facing class provides arrays for direction offset.
+                if (this.getType(a + Facing.b[i], b, c + Facing.d[i]) == block) {
+                    tile = this.getTileEntity(a + Facing.b[i], b, c + Facing.d[i]);
+                    if (tile instanceof TileEntityChest) {
+                        tile.scheduleTicks();
+                    }
+                    break;
+                }
+            }
+        }
+    }
     // Spigot end
 
     public BiomeBase getBiome(int i, int j) {
@@ -404,6 +441,14 @@ public abstract class World implements IBlockAccess {
                     this.notifyAndUpdatePhysics(i, j, k, chunk, block1, block, i1);
                 // CraftBukkit end
                 }
+                // Spigot start - If this block is changing to that which a chest beneath it
+                // becomes able to be opened, then the chest must be updated.
+                // block1 is the old block. block is the new block. r returns true if the block type
+                // prevents access to a chest.
+                if (this.spigotConfig.altHopperTicking && block1 != null && block1.r() && !block.r()) {
+                    this.updateChestAndHoppers(i, j - 1, k);
+                }
+                // Spigot end
 
                 return flag;
             }
@@ -1455,6 +1500,7 @@ public abstract class World implements IBlockAccess {
         }
         // Spigot End
         this.M = true;
+        this.initializeHoppers(); // Spigot - Initializes hoppers which have been added recently.
         Iterator iterator = this.tileEntityList.iterator();
 
         while (iterator.hasNext()) {
diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
index 3e6b1e6..a81b7c9 100644
--- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
+++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
@@ -166,11 +166,35 @@ public class SpigotWorldConfig
         log( "Entity Tracking Range: Pl " + playerTrackingRange + " / An " + animalTrackingRange + " / Mo " + monsterTrackingRange + " / Mi " + miscTrackingRange + " / Other " + otherTrackingRange );
     }
 
+    public boolean altHopperTicking;
     public int hopperTransfer;
     public int hopperCheck;
     public int hopperAmount;
     private void hoppers()
     {
+        // Alternate ticking method. Uses inventory changes, redstone updates etc.
+        // to update hoppers. Hopper-check is disabled when this is true.
+        boolean prev = altHopperTicking;
+        altHopperTicking = getBoolean( "hopper-alt-ticking", false );
+        // Necessary for the reload command
+        if (prev != altHopperTicking) {
+            net.minecraft.server.World world = (net.minecraft.server.World) Bukkit.getWorld(this.worldName);
+            if (world != null) {
+                if (altHopperTicking) {
+                    for (Object o : world.tileEntityList) {
+                        if (o instanceof net.minecraft.server.TileEntityHopper) {
+                            ((net.minecraft.server.TileEntityHopper) o).convertToScheduling();
+                        }
+                    }
+                } else {
+                    for (Object o : world.tileEntityList) {
+                        if (o instanceof net.minecraft.server.TileEntityHopper) {
+                            ((net.minecraft.server.TileEntityHopper) o).convertToPolling();
+                        }
+                    }
+                }
+            }
+        }
         // Set the tick delay between hopper item movements
         hopperTransfer = getInt( "ticks-per.hopper-transfer", 8 );
         // Set the tick delay between checking for items after the associated
@@ -178,6 +202,7 @@ public class SpigotWorldConfig
         // hopper sorting machines from becoming out of sync.
         hopperCheck = getInt( "ticks-per.hopper-check", hopperTransfer );
         hopperAmount = getInt( "hopper-amount", 1 );
+        log( "Alternative Hopper Ticking: " + altHopperTicking );
         log( "Hopper Transfer: " + hopperTransfer + " Hopper Check: " + hopperCheck + " Hopper Amount: " + hopperAmount );
     }
 
-- 
1.9.1