    001    package net.minecraft.src;
    002
    003    import java.io.IOException;
    004    import java.util.ArrayList;
    005    import java.util.HashSet;
    006    import java.util.Iterator;
    007    import java.util.List;
    008    import java.util.Set;
    009
    010    import net.minecraftforge.common.DimensionManager;
    011    import net.minecraftforge.common.ForgeChunkManager;
    012
    013    import cpw.mods.fml.common.registry.GameRegistry;
    014
    015    public class ChunkProviderServer implements IChunkProvider
    016    {
    017        /**
    018         * used by unload100OldestChunks to iterate the loadedChunkHashMap for unload (underlying assumption, first in,
    019         * first out)
    020         */
    021        private Set chunksToUnload = new HashSet();
    022        private Chunk defaultEmptyChunk;
    023        private IChunkProvider currentChunkProvider;
    024        IChunkLoader currentChunkLoader;
    025
    026        /**
    027         * if this is false, the defaultEmptyChunk will be returned by the provider
    028         */
    029        public boolean loadChunkOnProvideRequest = true;
    030        private LongHashMap loadedChunkHashMap = new LongHashMap();
    031        private List loadedChunks = new ArrayList();
    032        private WorldServer currentServer;
    033
    034        public ChunkProviderServer(WorldServer par1WorldServer, IChunkLoader par2IChunkLoader, IChunkProvider par3IChunkProvider)
    035        {
    036            this.defaultEmptyChunk = new EmptyChunk(par1WorldServer, 0, 0);
    037            this.currentServer = par1WorldServer;
    038            this.currentChunkLoader = par2IChunkLoader;
    039            this.currentChunkProvider = par3IChunkProvider;
    040        }
    041
    042        /**
    043         * Checks to see if a chunk exists at x, y
    044         */
    045        public boolean chunkExists(int par1, int par2)
    046        {
    047            return this.loadedChunkHashMap.containsItem(ChunkCoordIntPair.chunkXZ2Int(par1, par2));
    048        }
    049
    050        /**
    051         * marks chunk for unload by "unload100OldestChunks"  if there is no spawn point, or if the center of the chunk is
    052         * outside 200 blocks (x or z) of the spawn
    053         */
    054        public void unloadChunksIfNotNearSpawn(int par1, int par2)
    055        {
    056            if (this.currentServer.provider.canRespawnHere() && DimensionManager.shouldLoadSpawn(currentServer.provider.dimensionId))
    057            {
    058                ChunkCoordinates var3 = this.currentServer.getSpawnPoint();
    059                int var4 = par1 * 16 + 8 - var3.posX;
    060                int var5 = par2 * 16 + 8 - var3.posZ;
    061                short var6 = 128;
    062
    063                if (var4 < -var6 || var4 > var6 || var5 < -var6 || var5 > var6)
    064                {
    065                    this.chunksToUnload.add(Long.valueOf(ChunkCoordIntPair.chunkXZ2Int(par1, par2)));
    066                }
    067            }
    068            else
    069            {
    070                this.chunksToUnload.add(Long.valueOf(ChunkCoordIntPair.chunkXZ2Int(par1, par2)));
    071            }
    072        }
    073
    074        /**
    075         * marks all chunks for unload, ignoring those near the spawn
    076         */
    077        public void unloadAllChunks()
    078        {
    079            Iterator var1 = this.loadedChunks.iterator();
    080
    081            while (var1.hasNext())
    082            {
    083                Chunk var2 = (Chunk)var1.next();
    084                this.unloadChunksIfNotNearSpawn(var2.xPosition, var2.zPosition);
    085            }
    086        }
    087
    088        /**
    089         * loads or generates the chunk at the chunk location specified
    090         */
    091        public Chunk loadChunk(int par1, int par2)
    092        {
    093            long var3 = ChunkCoordIntPair.chunkXZ2Int(par1, par2);
    094            this.chunksToUnload.remove(Long.valueOf(var3));
    095            Chunk var5 = (Chunk)this.loadedChunkHashMap.getValueByKey(var3);
    096
    097            if (var5 == null)
    098            {
    099                var5 = ForgeChunkManager.fetchDormantChunk(var3, currentServer);
    100                if (var5 == null)
    101                {
    102                    var5 = this.safeLoadChunk(par1, par2);
    103                }
    104
    105                if (var5 == null)
    106                {
    107                    if (this.currentChunkProvider == null)
    108                    {
    109                        var5 = this.defaultEmptyChunk;
    110                    }
    111                    else
    112                    {
    113                        var5 = this.currentChunkProvider.provideChunk(par1, par2);
    114                    }
    115                }
    116
    117                this.loadedChunkHashMap.add(var3, var5);
    118                this.loadedChunks.add(var5);
    119
    120                if (var5 != null)
    121                {
    122                    var5.onChunkLoad();
    123                }
    124
    125                var5.populateChunk(this, this, par1, par2);
    126            }
    127
    128            return var5;
    129        }
    130
    131        /**
    132         * Will return back a chunk, if it doesn't exist and its not a MP client it will generates all the blocks for the
    133         * specified chunk from the map seed and chunk seed
    134         */
    135        public Chunk provideChunk(int par1, int par2)
    136        {
    137            Chunk var3 = (Chunk)this.loadedChunkHashMap.getValueByKey(ChunkCoordIntPair.chunkXZ2Int(par1, par2));
    138            return var3 == null ? (!this.currentServer.findingSpawnPoint && !this.loadChunkOnProvideRequest ? this.defaultEmptyChunk : this.loadChunk(par1, par2)) : var3;
    139        }
    140
    141        /**
    142         * used by loadChunk, but catches any exceptions if the load fails.
    143         */
    144        private Chunk safeLoadChunk(int par1, int par2)
    145        {
    146            if (this.currentChunkLoader == null)
    147            {
    148                return null;
    149            }
    150            else
    151            {
    152                try
    153                {
    154                    Chunk var3 = this.currentChunkLoader.loadChunk(this.currentServer, par1, par2);
    155
    156                    if (var3 != null)
    157                    {
    158                        var3.lastSaveTime = this.currentServer.func_82737_E();
    159
    160                        if (this.currentChunkProvider != null)
    161                        {
    162                            this.currentChunkProvider.func_82695_e(par1, par2);
    163                        }
    164                    }
    165
    166                    return var3;
    167                }
    168                catch (Exception var4)
    169                {
    170                    var4.printStackTrace();
    171                    return null;
    172                }
    173            }
    174        }
    175
    176        /**
    177         * used by saveChunks, but catches any exceptions if the save fails.
    178         */
    179        private void safeSaveExtraChunkData(Chunk par1Chunk)
    180        {
    181            if (this.currentChunkLoader != null)
    182            {
    183                try
    184                {
    185                    this.currentChunkLoader.saveExtraChunkData(this.currentServer, par1Chunk);
    186                }
    187                catch (Exception var3)
    188                {
    189                    var3.printStackTrace();
    190                }
    191            }
    192        }
    193
    194        /**
    195         * used by saveChunks, but catches any exceptions if the save fails.
    196         */
    197        private void safeSaveChunk(Chunk par1Chunk)
    198        {
    199            if (this.currentChunkLoader != null)
    200            {
    201                try
    202                {
    203                    par1Chunk.lastSaveTime = this.currentServer.func_82737_E();
    204                    this.currentChunkLoader.saveChunk(this.currentServer, par1Chunk);
    205                }
    206                catch (IOException var3)
    207                {
    208                    var3.printStackTrace();
    209                }
    210                catch (MinecraftException var4)
    211                {
    212                    var4.printStackTrace();
    213                }
    214            }
    215        }
    216
    217        /**
    218         * Populates chunk with ores etc etc
    219         */
    220        public void populate(IChunkProvider par1IChunkProvider, int par2, int par3)
    221        {
    222            Chunk var4 = this.provideChunk(par2, par3);
    223
    224            if (!var4.isTerrainPopulated)
    225            {
    226                var4.isTerrainPopulated = true;
    227
    228                if (this.currentChunkProvider != null)
    229                {
    230                    this.currentChunkProvider.populate(par1IChunkProvider, par2, par3);
    231                    GameRegistry.generateWorld(par2, par3, currentServer, currentChunkProvider, par1IChunkProvider);
    232                    var4.setChunkModified();
    233                }
    234            }
    235        }
    236
    237        /**
    238         * Two modes of operation: if passed true, save all Chunks in one go.  If passed false, save up to two chunks.
    239         * Return true if all chunks have been saved.
    240         */
    241        public boolean saveChunks(boolean par1, IProgressUpdate par2IProgressUpdate)
    242        {
    243            int var3 = 0;
    244            Iterator var4 = this.loadedChunks.iterator();
    245
    246            while (var4.hasNext())
    247            {
    248                Chunk var5 = (Chunk)var4.next();
    249
    250                if (par1)
    251                {
    252                    this.safeSaveExtraChunkData(var5);
    253                }
    254
    255                if (var5.needsSaving(par1))
    256                {
    257                    this.safeSaveChunk(var5);
    258                    var5.isModified = false;
    259                    ++var3;
    260
    261                    if (var3 == 24 && !par1)
    262                    {
    263                        return false;
    264                    }
    265                }
    266            }
    267
    268            if (par1)
    269            {
    270                if (this.currentChunkLoader == null)
    271                {
    272                    return true;
    273                }
    274
    275                this.currentChunkLoader.saveExtraData();
    276            }
    277
    278            return true;
    279        }
    280
    281        /**
    282         * Unloads the 100 oldest chunks from memory, due to a bug with chunkSet.add() never being called it thinks the list
    283         * is always empty and will not remove any chunks.
    284         */
    285        public boolean unload100OldestChunks()
    286        {
    287            if (!this.currentServer.canNotSave)
    288            {
    289                for (ChunkCoordIntPair forced : currentServer.getPersistentChunks().keySet())
    290                {
    291                    this.chunksToUnload.remove(ChunkCoordIntPair.chunkXZ2Int(forced.chunkXPos, forced.chunkZPos));
    292                }
    293
    294                for (int var1 = 0; var1 < 100; ++var1)
    295                {
    296                    if (!this.chunksToUnload.isEmpty())
    297                    {
    298                        Long var2 = (Long)this.chunksToUnload.iterator().next();
    299                        Chunk var3 = (Chunk)this.loadedChunkHashMap.getValueByKey(var2.longValue());
    300                        var3.onChunkUnload();
    301                        this.safeSaveChunk(var3);
    302                        this.safeSaveExtraChunkData(var3);
    303                        this.chunksToUnload.remove(var2);
    304                        this.loadedChunkHashMap.remove(var2.longValue());
    305                        this.loadedChunks.remove(var3);
    306                        ForgeChunkManager.putDormantChunk(ChunkCoordIntPair.chunkXZ2Int(var3.xPosition, var3.zPosition), var3);
    307                        if(loadedChunks.size() == 0 && ForgeChunkManager.getPersistentChunksFor(currentServer).size() == 0 && !DimensionManager.shouldLoadSpawn(currentServer.provider.dimensionId)) {
    308                            DimensionManager.unloadWorld(currentServer.provider.dimensionId);
    309                            return currentChunkProvider.unload100OldestChunks();
    310                        }
    311                    }
    312                }
    313
    314                if (this.currentChunkLoader != null)
    315                {
    316                    this.currentChunkLoader.chunkTick();
    317                }
    318            }
    319
    320            return this.currentChunkProvider.unload100OldestChunks();
    321        }
    322
    323        /**
    324         * Returns if the IChunkProvider supports saving.
    325         */
    326        public boolean canSave()
    327        {
    328            return !this.currentServer.canNotSave;
    329        }
    330
    331        /**
    332         * Converts the instance data to a readable string.
    333         */
    334        public String makeString()
    335        {
    336            return "ServerChunkCache: " + this.loadedChunkHashMap.getNumHashElements() + " Drop: " + this.chunksToUnload.size();
    337        }
    338
    339        /**
    340         * Returns a list of creatures of the specified type that can spawn at the given location.
    341         */
    342        public List getPossibleCreatures(EnumCreatureType par1EnumCreatureType, int par2, int par3, int par4)
    343        {
    344            return this.currentChunkProvider.getPossibleCreatures(par1EnumCreatureType, par2, par3, par4);
    345        }
    346
    347        /**
    348         * Returns the location of the closest structure of the specified type. If not found returns null.
    349         */
    350        public ChunkPosition findClosestStructure(World par1World, String par2Str, int par3, int par4, int par5)
    351        {
    352            return this.currentChunkProvider.findClosestStructure(par1World, par2Str, par3, par4, par5);
    353        }
    354
    355        public int getLoadedChunkCount()
    356        {
    357            return this.loadedChunkHashMap.getNumHashElements();
    358        }
    359
    360        public void func_82695_e(int par1, int par2) {}
    361    }