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.getWorldTime();
159 }
160
161 return var3;
162 }
163 catch (Exception var4)
164 {
165 var4.printStackTrace();
166 return null;
167 }
168 }
169 }
170
171 /**
172 * used by saveChunks, but catches any exceptions if the save fails.
173 */
174 private void safeSaveExtraChunkData(Chunk par1Chunk)
175 {
176 if (this.currentChunkLoader != null)
177 {
178 try
179 {
180 this.currentChunkLoader.saveExtraChunkData(this.currentServer, par1Chunk);
181 }
182 catch (Exception var3)
183 {
184 var3.printStackTrace();
185 }
186 }
187 }
188
189 /**
190 * used by saveChunks, but catches any exceptions if the save fails.
191 */
192 private void safeSaveChunk(Chunk par1Chunk)
193 {
194 if (this.currentChunkLoader != null)
195 {
196 try
197 {
198 par1Chunk.lastSaveTime = this.currentServer.getWorldTime();
199 this.currentChunkLoader.saveChunk(this.currentServer, par1Chunk);
200 }
201 catch (IOException var3)
202 {
203 var3.printStackTrace();
204 }
205 catch (MinecraftException var4)
206 {
207 var4.printStackTrace();
208 }
209 }
210 }
211
212 /**
213 * Populates chunk with ores etc etc
214 */
215 public void populate(IChunkProvider par1IChunkProvider, int par2, int par3)
216 {
217 Chunk var4 = this.provideChunk(par2, par3);
218
219 if (!var4.isTerrainPopulated)
220 {
221 var4.isTerrainPopulated = true;
222
223 if (this.currentChunkProvider != null)
224 {
225 this.currentChunkProvider.populate(par1IChunkProvider, par2, par3);
226 GameRegistry.generateWorld(par2, par3, currentServer, currentChunkProvider, par1IChunkProvider);
227 var4.setChunkModified();
228 }
229 }
230 }
231
232 /**
233 * Two modes of operation: if passed true, save all Chunks in one go. If passed false, save up to two chunks.
234 * Return true if all chunks have been saved.
235 */
236 public boolean saveChunks(boolean par1, IProgressUpdate par2IProgressUpdate)
237 {
238 int var3 = 0;
239 Iterator var4 = this.loadedChunks.iterator();
240
241 while (var4.hasNext())
242 {
243 Chunk var5 = (Chunk)var4.next();
244
245 if (par1)
246 {
247 this.safeSaveExtraChunkData(var5);
248 }
249
250 if (var5.needsSaving(par1))
251 {
252 this.safeSaveChunk(var5);
253 var5.isModified = false;
254 ++var3;
255
256 if (var3 == 24 && !par1)
257 {
258 return false;
259 }
260 }
261 }
262
263 if (par1)
264 {
265 if (this.currentChunkLoader == null)
266 {
267 return true;
268 }
269
270 this.currentChunkLoader.saveExtraData();
271 }
272
273 return true;
274 }
275
276 /**
277 * Unloads the 100 oldest chunks from memory, due to a bug with chunkSet.add() never being called it thinks the list
278 * is always empty and will not remove any chunks.
279 */
280 public boolean unload100OldestChunks()
281 {
282 if (!this.currentServer.canNotSave)
283 {
284 for (ChunkCoordIntPair forced : currentServer.getPersistentChunks().keySet())
285 {
286 this.chunksToUnload.remove(ChunkCoordIntPair.chunkXZ2Int(forced.chunkXPos, forced.chunkZPos));
287 }
288
289 for (int var1 = 0; var1 < 100; ++var1)
290 {
291 if (!this.chunksToUnload.isEmpty())
292 {
293 Long var2 = (Long)this.chunksToUnload.iterator().next();
294 Chunk var3 = (Chunk)this.loadedChunkHashMap.getValueByKey(var2.longValue());
295 var3.onChunkUnload();
296 this.safeSaveChunk(var3);
297 this.safeSaveExtraChunkData(var3);
298 this.chunksToUnload.remove(var2);
299 this.loadedChunkHashMap.remove(var2.longValue());
300 this.loadedChunks.remove(var3);
301 ForgeChunkManager.putDormantChunk(ChunkCoordIntPair.chunkXZ2Int(var3.xPosition, var3.zPosition), var3);
302 if(loadedChunks.size() == 0 && ForgeChunkManager.getPersistentChunksFor(currentServer).size() == 0 && !DimensionManager.shouldLoadSpawn(currentServer.provider.dimensionId)) {
303 DimensionManager.unloadWorld(currentServer.provider.dimensionId);
304 return currentChunkProvider.unload100OldestChunks();
305 }
306 }
307 }
308
309 if (this.currentChunkLoader != null)
310 {
311 this.currentChunkLoader.chunkTick();
312 }
313 }
314
315 return this.currentChunkProvider.unload100OldestChunks();
316 }
317
318 /**
319 * Returns if the IChunkProvider supports saving.
320 */
321 public boolean canSave()
322 {
323 return !this.currentServer.canNotSave;
324 }
325
326 /**
327 * Converts the instance data to a readable string.
328 */
329 public String makeString()
330 {
331 return "ServerChunkCache: " + this.loadedChunkHashMap.getNumHashElements() + " Drop: " + this.chunksToUnload.size();
332 }
333
334 /**
335 * Returns a list of creatures of the specified type that can spawn at the given location.
336 */
337 public List getPossibleCreatures(EnumCreatureType par1EnumCreatureType, int par2, int par3, int par4)
338 {
339 return this.currentChunkProvider.getPossibleCreatures(par1EnumCreatureType, par2, par3, par4);
340 }
341
342 /**
343 * Returns the location of the closest structure of the specified type. If not found returns null.
344 */
345 public ChunkPosition findClosestStructure(World par1World, String par2Str, int par3, int par4, int par5)
346 {
347 return this.currentChunkProvider.findClosestStructure(par1World, par2Str, par3, par4, par5);
348 }
349
350 public int getLoadedChunkCount()
351 {
352 return this.loadedChunkHashMap.getNumHashElements();
353 }
354 }