Make monitors non-ticking

- Convert terminals from a polling-based system to a more event-driven
   one: they now accept an onChanged callback, which marks the parent as
   dirty.
 - Schedule ticks when monitors are marked as dirty.
 - Add several missing @Overrides. This has nothing to do with the rest
   of the changes, but I'm bad at good git practice.

src/main/java/dan200/computercraft/core/apis/ILuaAPI.java

@@ -16,6 +16,7 @@ public interface ILuaAPI extends dan200.computercraft.api.lua.ILuaAPI
 {
     void advance( double v );
 
+    @Override
     default void update()
     {
         advance( 0.05 );

src/main/java/dan200/computercraft/core/apis/http/ResourceQueue.java

@@ -26,12 +26,14 @@ public class ResourceQueue<T extends Resource<T>> extends ResourceGroup<T>
     {
     }
 
+    @Override
     public synchronized void shutdown()
     {
         super.shutdown();
         pending.clear();
     }
 
+    @Override
     public synchronized boolean queue( Supplier<T> resource )
     {
         if( !active ) return false;
@@ -40,6 +42,7 @@ public class ResourceQueue<T extends Resource<T>> extends ResourceGroup<T>
         return true;
     }
 
+    @Override
     public synchronized void release( T resource )
     {
         super.release( resource );

src/main/java/dan200/computercraft/core/apis/http/request/HttpRequest.java

@@ -239,6 +239,7 @@ public class HttpRequest extends Resource<HttpRequest>
         if( tryClose() ) environment.queueEvent( SUCCESS_EVENT, new Object[] { address, object } );
     }
 
+    @Override
     protected void dispose()
     {
         super.dispose();

src/main/java/dan200/computercraft/core/terminal/Terminal.java

@@ -29,11 +29,18 @@ public class Terminal
     private final Palette m_palette;
 
     private boolean m_changed;
+    private final Runnable onChanged;
 
     public Terminal( int width, int height )
+    {
+        this( width, height, null );
+    }
+
+    public Terminal( int width, int height, Runnable changedCallback )
     {
         m_width = width;
         m_height = height;
+        this.onChanged = changedCallback;
 
         m_cursorColour = 0;
         m_cursorBackgroundColour = 15;
@@ -65,7 +72,7 @@ public class Terminal
         m_cursorY = 0;
         m_cursorBlink = false;
         clear();
-        m_changed = true;
+        setChanged();
         m_palette.resetColours();
     }
 
@@ -122,7 +129,7 @@ public class Terminal
                 m_backgroundColour[i].write( oldBackgroundColour[i] );
             }
         }
-        m_changed = true;
+        setChanged();
     }
 
     public void setCursorPos( int x, int y )
@@ -131,7 +138,7 @@ public class Terminal
         {
             m_cursorX = x;
             m_cursorY = y;
-            m_changed = true;
+            setChanged();
         }
     }
 
@@ -140,7 +147,7 @@ public class Terminal
         if( m_cursorBlink != blink )
         {
             m_cursorBlink = blink;
-            m_changed = true;
+            setChanged();
         }
     }
 
@@ -149,7 +156,7 @@ public class Terminal
         if( m_cursorColour != colour )
         {
             m_cursorColour = colour;
-            m_changed = true;
+            setChanged();
         }
     }
 
@@ -158,7 +165,7 @@ public class Terminal
         if( m_cursorBackgroundColour != colour )
         {
             m_cursorBackgroundColour = colour;
-            m_changed = true;
+            setChanged();
         }
     }
 
@@ -201,7 +208,7 @@ public class Terminal
             m_text[y].write( text, x );
             m_textColour[y].write( textColour, x );
             m_backgroundColour[y].write( backgroundColour, x );
-            m_changed = true;
+            setChanged();
         }
     }
 
@@ -214,7 +221,7 @@ public class Terminal
             m_text[y].write( text, x );
             m_textColour[y].fill( base16.charAt( m_cursorColour ), x, x + text.length() );
             m_backgroundColour[y].fill( base16.charAt( m_cursorBackgroundColour ), x, x + text.length() );
-            m_changed = true;
+            setChanged();
         }
     }
 
@@ -244,7 +251,7 @@ public class Terminal
             m_text = newText;
             m_textColour = newTextColour;
             m_backgroundColour = newBackgroundColour;
-            m_changed = true;
+            setChanged();
         }
     }
 
@@ -256,7 +263,7 @@ public class Terminal
             m_textColour[y].fill( base16.charAt( m_cursorColour ) );
             m_backgroundColour[y].fill( base16.charAt( m_cursorBackgroundColour ) );
         }
-        m_changed = true;
+        setChanged();
     }
 
     public synchronized void clearLine()
@@ -267,7 +274,7 @@ public class Terminal
             m_text[y].fill( ' ' );
             m_textColour[y].fill( base16.charAt( m_cursorColour ) );
             m_backgroundColour[y].fill( base16.charAt( m_cursorBackgroundColour ) );
-            m_changed = true;
+            setChanged();
         }
     }
 
@@ -285,7 +292,7 @@ public class Terminal
         m_text[y].write( text );
         m_textColour[y].write( textColour );
         m_backgroundColour[y].write( backgroundColour );
-        m_changed = true;
+        setChanged();
     }
 
     public synchronized TextBuffer getTextColourLine( int y )
@@ -306,17 +313,23 @@ public class Terminal
         return null;
     }
 
-    public boolean getChanged()
+    /**
+     * @deprecated All {@code *Changed()} methods are deprecated: one should pass in a callback
+     * instead.
+     */
+    @Deprecated
+    public final boolean getChanged()
     {
         return m_changed;
     }
 
-    public void setChanged()
+    public final void setChanged()
     {
         m_changed = true;
+        if( onChanged != null ) onChanged.run();
     }
 
-    public void clearChanged()
+    public final void clearChanged()
     {
         m_changed = false;
     }
@@ -371,6 +384,6 @@ public class Terminal
         {
             m_palette.readFromNBT( nbt );
         }
-        m_changed = true;
+        setChanged();
     }
 }

src/main/java/dan200/computercraft/shared/common/ClientTerminal.java

@@ -22,19 +22,14 @@ public class ClientTerminal implements ITerminal
         m_terminalChanged = false;
     }
 
-    public void update()
-    {
-        if( m_terminal != null )
-        {
-            m_terminalChanged |= m_terminal.getChanged();
-            m_terminal.clearChanged();
-        }
-    }
-
     public boolean pollTerminalChanged()
     {
         boolean changed = m_terminalChanged;
         m_terminalChanged = false;
+
+        Terminal terminal = m_terminal;
+        if( terminal != null ) terminal.clearChanged();
+
         return changed;
     }
 
@@ -71,7 +66,7 @@ public class ClientTerminal implements ITerminal
     {
         if( m_terminal == null )
         {
-            m_terminal = new Terminal( width, height );
+            m_terminal = new Terminal( width, height, () -> m_terminalChanged = true );
             m_terminalChanged = true;
         }
         else

src/main/java/dan200/computercraft/shared/common/ServerTerminal.java

@@ -9,35 +9,33 @@ package dan200.computercraft.shared.common;
 import dan200.computercraft.core.terminal.Terminal;
 import net.minecraft.nbt.NBTTagCompound;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 public class ServerTerminal implements ITerminal
 {
     private final boolean m_colour;
     private Terminal m_terminal;
-    private boolean m_terminalChanged;
+    private final AtomicBoolean m_terminalChanged = new AtomicBoolean( false );
-    private boolean m_terminalChangedLastFrame;
+    private boolean m_terminalChangedLastFrame = false;
 
     public ServerTerminal( boolean colour )
     {
         m_colour = colour;
         m_terminal = null;
-        m_terminalChanged = false;
-        m_terminalChangedLastFrame = false;
     }
 
     public ServerTerminal( boolean colour, int terminalWidth, int terminalHeight )
     {
         m_colour = colour;
-        m_terminal = new Terminal( terminalWidth, terminalHeight );
+        m_terminal = new Terminal( terminalWidth, terminalHeight, this::markTerminalChanged );
-        m_terminalChanged = false;
-        m_terminalChangedLastFrame = false;
     }
 
-    public void resize( int width, int height )
+    protected void resize( int width, int height )
     {
         if( m_terminal == null )
         {
-            m_terminal = new Terminal( width, height );
+            m_terminal = new Terminal( width, height, this::markTerminalChanged );
-            m_terminalChanged = true;
+            markTerminalChanged();
         }
         else
         {
@@ -50,23 +48,21 @@ public class ServerTerminal implements ITerminal
         if( m_terminal != null )
         {
             m_terminal = null;
-            m_terminalChanged = true;
+            markTerminalChanged();
         }
     }
 
     protected void markTerminalChanged()
     {
-        m_terminalChanged = true;
+        m_terminalChanged.set( true );
     }
 
     public void update()
     {
-        m_terminalChangedLastFrame = m_terminalChanged || (m_terminal != null && m_terminal.getChanged());
+        Terminal terminal = m_terminal;
-        if( m_terminal != null )
+        if( terminal != null ) terminal.clearChanged();
-        {
+
-            m_terminal.clearChanged();
+        m_terminalChangedLastFrame = m_terminalChanged.getAndSet( false );
-        }
-        m_terminalChanged = false;
     }
 
     public boolean hasTerminalChanged()

src/main/java/dan200/computercraft/shared/computer/core/ClientComputer.java

@@ -32,10 +32,8 @@ public class ClientComputer extends ClientTerminal implements IComputer
         m_instanceID = instanceID;
     }
 
-    @Override
     public void update()
     {
-        super.update();
         m_changedLastFrame = m_changed;
         m_changed = false;
     }

src/main/java/dan200/computercraft/shared/peripheral/common/BlockPeripheral.java

@@ -7,7 +7,7 @@
 package dan200.computercraft.shared.peripheral.common;
 
 import dan200.computercraft.ComputerCraft;
-import dan200.computercraft.shared.common.BlockDirectional;
+import dan200.computercraft.shared.common.BlockGeneric;
 import dan200.computercraft.shared.common.TileGeneric;
 import dan200.computercraft.shared.peripheral.PeripheralType;
 import dan200.computercraft.shared.peripheral.diskdrive.TileDiskDrive;
@@ -39,7 +39,7 @@ import net.minecraftforge.fml.relauncher.SideOnly;
 
 import javax.annotation.Nonnull;
 
-public class BlockPeripheral extends BlockDirectional
+public class BlockPeripheral extends BlockGeneric
 {
     public static class Properties
     {
@@ -466,11 +466,12 @@ public class BlockPeripheral extends BlockDirectional
             case DiskDrive:
             case Printer:
             {
-                if( stack.hasDisplayName() && tile instanceof ITilePeripheral )
+                EnumFacing dir = DirectionUtil.fromEntityRot( player );
+                if( stack.hasDisplayName() && tile instanceof TilePeripheralBase )
                 {
-                    ITilePeripheral peripheral = (ITilePeripheral) tile;
+                    TilePeripheralBase peripheral = (TilePeripheralBase) tile;
                     peripheral.setLabel( stack.getDisplayName() );
-                    peripheral.setDirection( DirectionUtil.fromEntityRot( player ) );
+                    peripheral.setDirection( dir );
                 }
                 break;
             }
@@ -558,14 +559,18 @@ public class BlockPeripheral extends BlockDirectional
     @Override
     @Deprecated
     @Nonnull
-    public AxisAlignedBB getBoundingBox( IBlockState state, IBlockAccess source, BlockPos pos )
+    public AxisAlignedBB getBoundingBox( IBlockState state, IBlockAccess world, BlockPos pos )
     {
         if( getPeripheralType( state ) == PeripheralType.WirelessModem )
         {
-            return ModemBounds.getBounds( getDirection( source, pos ) );
+            TileEntity tile = world.getTileEntity( pos );
+            if( tile instanceof TileWirelessModem )
+            {
+                return ModemBounds.getBounds( ((TileWirelessModem) tile).getDirection() );
+            }
         }
 
-        return super.getBoundingBox( state, source, pos );
+        return super.getBoundingBox( state, world, pos );
     }
 
     @Override

src/main/java/dan200/computercraft/shared/peripheral/common/ITilePeripheral.java

@@ -6,13 +6,12 @@
 
 package dan200.computercraft.shared.peripheral.common;
 
-import dan200.computercraft.shared.common.IDirectionalTile;
 import dan200.computercraft.shared.peripheral.PeripheralType;
 
 /**
  * The tile for {@link BlockPeripheral}.
  */
-public interface ITilePeripheral extends IDirectionalTile
+public interface ITilePeripheral
 {
     PeripheralType getPeripheralType();
 

src/main/java/dan200/computercraft/shared/peripheral/common/TilePeripheralBase.java

@@ -73,6 +73,7 @@ public abstract class TilePeripheralBase extends TileGeneric implements IPeriphe
         return null;
     }
 
+    @Override
     public void setLabel( String label )
     {
         m_label = label;

src/main/java/dan200/computercraft/shared/peripheral/monitor/ServerMonitor.java

@@ -8,12 +8,16 @@ package dan200.computercraft.shared.peripheral.monitor;
 
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.shared.common.ServerTerminal;
+import dan200.computercraft.shared.util.TickScheduler;
+
+import java.util.concurrent.atomic.AtomicBoolean;
 
 public class ServerMonitor extends ServerTerminal
 {
     private final TileMonitor origin;
     private int textScale = 2;
-    private boolean resized;
+    private final AtomicBoolean resized = new AtomicBoolean( false );
+    private final AtomicBoolean changed = new AtomicBoolean( false );
 
     public ServerMonitor( boolean colour, TileMonitor origin )
     {
@@ -41,10 +45,28 @@ public class ServerMonitor extends ServerTerminal
         if( oldWidth != termWidth || oldHeight != termHeight )
         {
             getTerminal().clear();
-            resized = true;
+            resized.set( true );
+            markChanged();
         }
     }
 
+    @Override
+    protected void markTerminalChanged()
+    {
+        super.markTerminalChanged();
+        markChanged();
+    }
+
+    private void markChanged()
+    {
+        if( !changed.getAndSet( true ) ) TickScheduler.schedule( origin );
+    }
+
+    protected void clearChanged()
+    {
+        changed.set( false );
+    }
+
     public int getTextScale()
     {
         return textScale;
@@ -57,14 +79,14 @@ public class ServerMonitor extends ServerTerminal
         rebuild();
     }
 
-    public synchronized boolean pollResized()
+    public boolean pollResized()
     {
-        if( resized )
+        return resized.getAndSet( false );
-        {
+    }
-            resized = false;
-            return true;
-        }
 
-        return false;
+    public boolean pollTerminalChanged()
+    {
+        update();
+        return hasTerminalChanged();
     }
 }

src/main/java/dan200/computercraft/shared/peripheral/monitor/TileMonitor.java

@@ -11,15 +11,20 @@ import dan200.computercraft.api.peripheral.IComputerAccess;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.shared.common.ServerTerminal;
+import dan200.computercraft.shared.common.TileGeneric;
 import dan200.computercraft.shared.peripheral.PeripheralType;
 import dan200.computercraft.shared.peripheral.common.BlockPeripheral;
-import dan200.computercraft.shared.peripheral.common.TilePeripheralBase;
+import dan200.computercraft.shared.peripheral.common.IPeripheralTile;
+import dan200.computercraft.shared.peripheral.common.ITilePeripheral;
+import dan200.computercraft.shared.peripheral.common.PeripheralItemFactory;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.util.EnumFacing;
 import net.minecraft.util.EnumHand;
+import net.minecraft.util.NonNullList;
 import net.minecraft.util.math.AxisAlignedBB;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
@@ -28,7 +33,7 @@ import javax.annotation.Nonnull;
 import java.util.HashSet;
 import java.util.Set;
 
-public class TileMonitor extends TilePeripheralBase
+public class TileMonitor extends TileGeneric implements ITilePeripheral, IPeripheralTile
 {
     // Statics
 
@@ -78,6 +83,7 @@ public class TileMonitor extends TilePeripheralBase
         super.onLoad();
         m_advanced = getBlockState().getValue( BlockPeripheral.Properties.VARIANT )
             .getPeripheralType() == PeripheralType.AdvancedMonitor;
+        world.scheduleUpdate( getPos(), getBlockType(), 0 );
     }
 
     @Override
@@ -146,44 +152,32 @@ public class TileMonitor extends TilePeripheralBase
     }
 
     @Override
-    public void update()
+    public void updateTick()
     {
-        super.update();
+        if( m_xIndex != 0 || m_yIndex != 0 || m_serverMonitor == null ) return;
 
-        if( !getWorld().isRemote )
+        m_serverMonitor.clearChanged();
+
+        if( m_serverMonitor.pollResized() )
         {
-            if( m_xIndex == 0 && m_yIndex == 0 && m_serverMonitor != null )
+            for( int x = 0; x < m_width; x++ )
             {
-                if( m_serverMonitor.pollResized() )
+                for( int y = 0; y < m_height; y++ )
                 {
-                    for( int x = 0; x < m_width; x++ )
+                    TileMonitor monitor = getNeighbour( x, y );
-                    {
+                    if( monitor == null ) continue;
-                        for( int y = 0; y < m_height; y++ )
-                        {
-                            TileMonitor monitor = getNeighbour( x, y );
-                            if( monitor == null ) continue;
 
-                            for( IComputerAccess computer : monitor.m_computers )
+                    for( IComputerAccess computer : monitor.m_computers )
-                            {
+                    {
-                                computer.queueEvent( "monitor_resize", new Object[] {
+                        computer.queueEvent( "monitor_resize", new Object[] {
-                                    computer.getAttachmentName()
+                            computer.getAttachmentName()
-                                } );
+                        } );
-                            }
-                        }
                     }
                 }
+            }
+        }
 
-                m_serverMonitor.update();
+        if( m_serverMonitor.pollTerminalChanged() ) updateBlock();
-                if( m_serverMonitor.hasTerminalChanged() ) updateBlock();
-            }
-        }
-        else
-        {
-            if( m_xIndex == 0 && m_yIndex == 0 && m_clientMonitor != null )
-            {
-                m_clientMonitor.update();
-            }
-        }
     }
 
     // IPeripheralTile implementation
@@ -197,6 +191,12 @@ public class TileMonitor extends TilePeripheralBase
         return m_peripheral;
     }
 
+    @Override
+    public PeripheralType getPeripheralType()
+    {
+        return m_advanced ? PeripheralType.AdvancedMonitor : PeripheralType.Monitor;
+    }
+
     public ServerMonitor getCachedServerMonitor()
     {
         return m_serverMonitor;
@@ -319,7 +319,6 @@ public class TileMonitor extends TilePeripheralBase
     }
     // Sizing and placement stuff
 
-    @Override
     public EnumFacing getDirection()
     {
         int dir = getDir() % 6;
@@ -444,7 +443,7 @@ public class TileMonitor extends TilePeripheralBase
         return getSimilarMonitorAt( pos.offset( right, xOffset ).offset( down, yOffset ) );
     }
 
-    public TileMonitor getOrigin()
+    private TileMonitor getOrigin()
     {
         return getNeighbour( 0, 0 );
     }
@@ -752,15 +751,16 @@ public class TileMonitor extends TilePeripheralBase
             {
                 case Monitor:
                 case AdvancedMonitor:
-                {
                     return false;
-                }
                 default:
-                {
                     return true;
-                }
             }
         }
     }
 
+    @Override
+    public void getDroppedItems( @Nonnull NonNullList<ItemStack> drops, boolean creative )
+    {
+        if( !creative ) drops.add( PeripheralItemFactory.create( this ) );
+    }
 }

src/main/java/dan200/computercraft/shared/pocket/core/PocketServerComputer.java

@@ -177,6 +177,7 @@ public class PocketServerComputer extends ServerComputer implements IPocketAcces
         }
     }
 
+    @Override
     public void broadcastState( boolean force )
     {
         super.broadcastState( force );