1 // 2 // Copyright 2005 The Android Open Source Project 3 // 4 // Pool of log messages. Not thread safe -- operations on the log pool 5 // should only happen in the main UI thread. 6 // 7 #ifndef _SIM_LOG_POOL_H 8 #define _SIM_LOG_POOL_H 9 10 #include "LogMessage.h" 11 12 /* 13 * This contains the pool of log messages. The messages themselves are 14 * allocated individually and reference counted. We add new messages to 15 * the head and, when the total "footprint" exceeds our stated max, we 16 * delete one or more from the tail. 17 * 18 * To support pause/resume, we allow a "bookmark" to be set. This is 19 * just a pointer to a message in the pool. If the bookmarked message 20 * is deleted, we discard the bookmark. 21 */ 22 class LogPool { 23 public: LogPool(void)24 LogPool(void) 25 : mpHead(NULL), mpTail(NULL), mpBookmark(NULL), 26 mCurrentSize(0), mMaxSize(10240) 27 {} ~LogPool(void)28 ~LogPool(void) { Clear(); } 29 30 void Clear(void); 31 32 /* add a new message to the pool */ 33 void Add(LogMessage* pLogMessage); 34 35 /* resize the pool, removing excess messages */ 36 void Resize(long maxSize); 37 38 /* return the current limit, in bytes */ GetMaxSize(void)39 long GetMaxSize(void) const { return mMaxSize; } 40 GetHead(void)41 LogMessage* GetHead(void) const { return mpHead; } 42 SetBookmark(void)43 void SetBookmark(void) { mpBookmark = mpHead; } GetBookmark(void)44 LogMessage* GetBookmark(void) const { return mpBookmark; } 45 46 private: 47 void RemoveOldest(void); 48 49 LogMessage* mpHead; 50 LogMessage* mpTail; 51 LogMessage* mpBookmark; 52 long mCurrentSize; // current size, in bytes 53 long mMaxSize; // maximum size, in bytes 54 }; 55 56 #endif // _SIM_LOG_POOL_H 57