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                        try
114                        {
115                            var5 = this.currentChunkProvider.provideChunk(par1, par2);
116                        }
117                        catch (Throwable var9)
118                        {
119                            CrashReport var7 = CrashReport.func_85055_a(var9, "Exception generating new chunk");
120                            CrashReportCategory var8 = var7.func_85058_a("Chunk to be generated");
121                            var8.addCrashSection("Location", String.format("%d,%d", new Object[] {Integer.valueOf(par1), Integer.valueOf(par2)}));
122                            var8.addCrashSection("Position hash", Long.valueOf(var3));
123                            var8.addCrashSection("Generator", this.currentChunkProvider.makeString());
124                            throw new ReportedException(var7);
125                        }
126                    }
127                }
128    
129                this.loadedChunkHashMap.add(var3, var5);
130                this.loadedChunks.add(var5);
131    
132                if (var5 != null)
133                {
134                    var5.onChunkLoad();
135                }
136    
137                var5.populateChunk(this, this, par1, par2);
138            }
139    
140            return var5;
141        }
142    
143        /**
144         * Will return back a chunk, if it doesn't exist and its not a MP client it will generates all the blocks for the
145         * specified chunk from the map seed and chunk seed
146         */
147        public Chunk provideChunk(int par1, int par2)
148        {
149            Chunk var3 = (Chunk)this.loadedChunkHashMap.getValueByKey(ChunkCoordIntPair.chunkXZ2Int(par1, par2));
150            return var3 == null ? (!this.currentServer.findingSpawnPoint && !this.loadChunkOnProvideRequest ? this.defaultEmptyChunk : this.loadChunk(par1, par2)) : var3;
151        }
152    
153        /**
154         * used by loadChunk, but catches any exceptions if the load fails.
155         */
156        private Chunk safeLoadChunk(int par1, int par2)
157        {
158            if (this.currentChunkLoader == null)
159            {
160                return null;
161            }
162            else
163            {
164                try
165                {
166                    Chunk var3 = this.currentChunkLoader.loadChunk(this.currentServer, par1, par2);
167    
168                    if (var3 != null)
169                    {
170                        var3.lastSaveTime = this.currentServer.getTotalWorldTime();
171    
172                        if (this.currentChunkProvider != null)
173                        {
174                            this.currentChunkProvider.func_82695_e(par1, par2);
175                        }
176                    }
177    
178                    return var3;
179                }
180                catch (Exception var4)
181                {
182                    var4.printStackTrace();
183                    return null;
184                }
185            }
186        }
187    
188        /**
189         * used by saveChunks, but catches any exceptions if the save fails.
190         */
191        private void safeSaveExtraChunkData(Chunk par1Chunk)
192        {
193            if (this.currentChunkLoader != null)
194            {
195                try
196                {
197                    this.currentChunkLoader.saveExtraChunkData(this.currentServer, par1Chunk);
198                }
199                catch (Exception var3)
200                {
201                    var3.printStackTrace();
202                }
203            }
204        }
205    
206        /**
207         * used by saveChunks, but catches any exceptions if the save fails.
208         */
209        private void safeSaveChunk(Chunk par1Chunk)
210        {
211            if (this.currentChunkLoader != null)
212            {
213                try
214                {
215                    par1Chunk.lastSaveTime = this.currentServer.getTotalWorldTime();
216                    this.currentChunkLoader.saveChunk(this.currentServer, par1Chunk);
217                }
218                catch (IOException var3)
219                {
220                    var3.printStackTrace();
221                }
222                catch (MinecraftException var4)
223                {
224                    var4.printStackTrace();
225                }
226            }
227        }
228    
229        /**
230         * Populates chunk with ores etc etc
231         */
232        public void populate(IChunkProvider par1IChunkProvider, int par2, int par3)
233        {
234            Chunk var4 = this.provideChunk(par2, par3);
235    
236            if (!var4.isTerrainPopulated)
237            {
238                var4.isTerrainPopulated = true;
239    
240                if (this.currentChunkProvider != null)
241                {
242                    this.currentChunkProvider.populate(par1IChunkProvider, par2, par3);
243                    GameRegistry.generateWorld(par2, par3, currentServer, currentChunkProvider, par1IChunkProvider);
244                    var4.setChunkModified();
245                }
246            }
247        }
248    
249        /**
250         * Two modes of operation: if passed true, save all Chunks in one go.  If passed false, save up to two chunks.
251         * Return true if all chunks have been saved.
252         */
253        public boolean saveChunks(boolean par1, IProgressUpdate par2IProgressUpdate)
254        {
255            int var3 = 0;
256            Iterator var4 = this.loadedChunks.iterator();
257    
258            while (var4.hasNext())
259            {
260                Chunk var5 = (Chunk)var4.next();
261    
262                if (par1)
263                {
264                    this.safeSaveExtraChunkData(var5);
265                }
266    
267                if (var5.needsSaving(par1))
268                {
269                    this.safeSaveChunk(var5);
270                    var5.isModified = false;
271                    ++var3;
272    
273                    if (var3 == 24 && !par1)
274                    {
275                        return false;
276                    }
277                }
278            }
279    
280            if (par1)
281            {
282                if (this.currentChunkLoader == null)
283                {
284                    return true;
285                }
286    
287                this.currentChunkLoader.saveExtraData();
288            }
289    
290            return true;
291        }
292    
293        /**
294         * Unloads the 100 oldest chunks from memory, due to a bug with chunkSet.add() never being called it thinks the list
295         * is always empty and will not remove any chunks.
296         */
297        public boolean unload100OldestChunks()
298        {
299            if (!this.currentServer.canNotSave)
300            {
301                for (ChunkCoordIntPair forced : currentServer.getPersistentChunks().keySet())
302                {
303                    this.chunksToUnload.remove(ChunkCoordIntPair.chunkXZ2Int(forced.chunkXPos, forced.chunkZPos));
304                }
305    
306                for (int var1 = 0; var1 < 100; ++var1)
307                {
308                    if (!this.chunksToUnload.isEmpty())
309                    {
310                        Long var2 = (Long)this.chunksToUnload.iterator().next();
311                        Chunk var3 = (Chunk)this.loadedChunkHashMap.getValueByKey(var2.longValue());
312                        var3.onChunkUnload();
313                        this.safeSaveChunk(var3);
314                        this.safeSaveExtraChunkData(var3);
315                        this.chunksToUnload.remove(var2);
316                        this.loadedChunkHashMap.remove(var2.longValue());
317                        this.loadedChunks.remove(var3);
318                        ForgeChunkManager.putDormantChunk(ChunkCoordIntPair.chunkXZ2Int(var3.xPosition, var3.zPosition), var3);
319                        if(loadedChunks.size() == 0 && ForgeChunkManager.getPersistentChunksFor(currentServer).size() == 0 && !DimensionManager.shouldLoadSpawn(currentServer.provider.dimensionId)) {
320                            DimensionManager.unloadWorld(currentServer.provider.dimensionId);
321                            return currentChunkProvider.unload100OldestChunks();
322                        }
323                    }
324                }
325    
326                if (this.currentChunkLoader != null)
327                {
328                    this.currentChunkLoader.chunkTick();
329                }
330            }
331    
332            return this.currentChunkProvider.unload100OldestChunks();
333        }
334    
335        /**
336         * Returns if the IChunkProvider supports saving.
337         */
338        public boolean canSave()
339        {
340            return !this.currentServer.canNotSave;
341        }
342    
343        /**
344         * Converts the instance data to a readable string.
345         */
346        public String makeString()
347        {
348            return "ServerChunkCache: " + this.loadedChunkHashMap.getNumHashElements() + " Drop: " + this.chunksToUnload.size();
349        }
350    
351        /**
352         * Returns a list of creatures of the specified type that can spawn at the given location.
353         */
354        public List getPossibleCreatures(EnumCreatureType par1EnumCreatureType, int par2, int par3, int par4)
355        {
356            return this.currentChunkProvider.getPossibleCreatures(par1EnumCreatureType, par2, par3, par4);
357        }
358    
359        /**
360         * Returns the location of the closest structure of the specified type. If not found returns null.
361         */
362        public ChunkPosition findClosestStructure(World par1World, String par2Str, int par3, int par4, int par5)
363        {
364            return this.currentChunkProvider.findClosestStructure(par1World, par2Str, par3, par4, par5);
365        }
366    
367        public int getLoadedChunkCount()
368        {
369            return this.loadedChunkHashMap.getNumHashElements();
370        }
371    
372        public void func_82695_e(int par1, int par2) {}
373    }