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authorAlexander Harkness <bearbin@gmail.com>2013-11-24 15:19:41 +0100
committerAlexander Harkness <bearbin@gmail.com>2013-11-24 15:19:41 +0100
commit675b4aa878f16291ce33fced48a2bc7425f635ae (patch)
tree409914df27a98f65adf866da669429c4de141b6f /src/WorldStorage/WorldStorage.h
parentLineBlockTracer: Using the coord-based block faces. (diff)
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diff --git a/src/WorldStorage/WorldStorage.h b/src/WorldStorage/WorldStorage.h
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+
+// WorldStorage.h
+
+// Interfaces to the cWorldStorage class representing the chunk loading / saving thread
+// This class decides which storage schema to use for saving; it queries all available schemas for loading
+// Also declares the base class for all storage schemas, cWSSchema
+// Helper serialization class cJsonChunkSerializer is declared as well
+
+
+
+
+
+#pragma once
+#ifndef WORLDSTORAGE_H_INCLUDED
+#define WORLDSTORAGE_H_INCLUDED
+
+#include "../ChunkDef.h"
+#include "../OSSupport/IsThread.h"
+#include <json/json.h>
+
+
+
+
+
+// fwd:
+class cWorld;
+
+
+
+
+
+/// Interface that all the world storage schemas need to implement
+class cWSSchema abstract
+{
+public:
+ cWSSchema(cWorld * a_World) : m_World(a_World) {}
+ virtual ~cWSSchema() {} // Force the descendants' destructors to be virtual
+
+ virtual bool LoadChunk(const cChunkCoords & a_Chunk) = 0;
+ virtual bool SaveChunk(const cChunkCoords & a_Chunk) = 0;
+ virtual const AString GetName(void) const = 0;
+
+protected:
+
+ cWorld * m_World;
+} ;
+
+typedef std::list<cWSSchema *> cWSSchemaList;
+
+
+
+
+
+/// The actual world storage class
+class cWorldStorage :
+ public cIsThread
+{
+ typedef cIsThread super;
+
+public:
+
+ cWorldStorage(void);
+ ~cWorldStorage();
+
+ void QueueLoadChunk(int a_ChunkX, int a_ChunkY, int a_ChunkZ, bool a_Generate); // Queues the chunk for loading; if not loaded, the chunk will be generated if a_Generate is true
+ void QueueSaveChunk(int a_ChunkX, int a_ChunkY, int a_ChunkZ);
+
+ /// Signals that a message should be output to the console when all the chunks have been saved
+ void QueueSavedMessage(void);
+
+ /// Loads the chunk specified; returns true on success, false on failure
+ bool LoadChunk(int a_ChunkX, int a_ChunkY, int a_ChunkZ);
+
+ void UnqueueLoad(int a_ChunkX, int a_ChunkY, int a_ChunkZ);
+ void UnqueueSave(const cChunkCoords & a_Chunk);
+
+ bool Start(cWorld * a_World, const AString & a_StorageSchemaName); // Hide the cIsThread's Start() method, we need to provide args
+ void Stop(void); // Hide the cIsThread's Stop() method, we need to signal the event
+ void WaitForFinish(void);
+ void WaitForQueuesEmpty(void);
+
+ int GetLoadQueueLength(void);
+ int GetSaveQueueLength(void);
+
+protected:
+
+ struct sChunkLoad
+ {
+ int m_ChunkX;
+ int m_ChunkY;
+ int m_ChunkZ;
+ bool m_Generate; // If true, the chunk will be generated if it cannot be loaded
+
+ sChunkLoad(int a_ChunkX, int a_ChunkY, int a_ChunkZ, bool a_Generate) : m_ChunkX(a_ChunkX), m_ChunkY(a_ChunkY), m_ChunkZ(a_ChunkZ), m_Generate(a_Generate) {}
+ } ;
+
+ typedef std::list<sChunkLoad> sChunkLoadQueue;
+
+ cWorld * m_World;
+ AString m_StorageSchemaName;
+
+ // Both queues are locked by the same CS
+ cCriticalSection m_CSQueues;
+ sChunkLoadQueue m_LoadQueue;
+ cChunkCoordsList m_SaveQueue;
+
+ cEvent m_Event; // Set when there's any addition to the queues
+ cEvent m_evtRemoved; // Set when an item has been removed from the queue, either by the worker thread or the Unqueue methods
+
+ /// All the storage schemas (all used for loading)
+ cWSSchemaList m_Schemas;
+
+ /// The one storage schema used for saving
+ cWSSchema * m_SaveSchema;
+
+ void InitSchemas(void);
+
+ virtual void Execute(void) override;
+
+ /// Loads one chunk from the queue (if any queued); returns true if there are more chunks in the load queue
+ bool LoadOneChunk(void);
+
+ /// Saves one chunk from the queue (if any queued); returns true if there are more chunks in the save queue
+ bool SaveOneChunk(void);
+} ;
+
+
+
+
+
+#endif // WORLDSTORAGE_H_INCLUDED
+
+
+
+