1 // 2 // Copyright 2005 The Android Open Source Project 3 // 4 // Hold a collection of log messages, limiting ourselves to a certain 5 // fixed maximum amount of memory. 6 // 7 #include "LogPool.h" 8 #include <assert.h> 9 10 11 /* 12 * Add a message at the head of the pool. 13 */ Add(LogMessage * pLogMessage)14void LogPool::Add(LogMessage* pLogMessage) 15 { 16 pLogMessage->Acquire(); // bump up the ref count 17 18 assert(pLogMessage->GetPrev() == NULL); 19 assert(pLogMessage->GetNext() == NULL); 20 21 if (mpHead == NULL) { 22 assert(mpTail == NULL); 23 mpTail = mpHead = pLogMessage; 24 } else { 25 assert(mpHead->GetPrev() == NULL); 26 mpHead->SetPrev(pLogMessage); 27 pLogMessage->SetNext(mpHead); 28 mpHead = pLogMessage; 29 } 30 31 /* update the pool size, and remove old entries if necessary */ 32 mCurrentSize += pLogMessage->GetFootprint(); 33 34 while (mCurrentSize > mMaxSize) 35 RemoveOldest(); 36 } 37 38 /* 39 * Remove the oldest message (from the tail of the list). 40 */ RemoveOldest(void)41void LogPool::RemoveOldest(void) 42 { 43 LogMessage* pPrev; 44 45 if (mpTail == NULL) { 46 fprintf(stderr, "HEY: nothing left to remove (cur=%ld)\n", 47 mCurrentSize); 48 assert(false); 49 return; 50 } 51 52 if (mpTail == mpBookmark) 53 mpBookmark = NULL; 54 55 //printf("--- removing oldest, size %ld->%ld (%s)\n", 56 // mCurrentSize, mCurrentSize - mpTail->GetFootprint(),mpTail->GetMsg()); 57 mCurrentSize -= mpTail->GetFootprint(); 58 59 pPrev = mpTail->GetPrev(); 60 mpTail->Release(); 61 mpTail = pPrev; 62 if (mpTail == NULL) { 63 //printf("--- pool is now empty (size=%ld)\n", mCurrentSize); 64 mpHead = NULL; 65 } else { 66 mpTail->SetNext(NULL); 67 } 68 } 69 70 /* 71 * Resize the log pool. 72 */ Resize(long maxSize)73void LogPool::Resize(long maxSize) 74 { 75 assert(maxSize >= 0); 76 77 mMaxSize = maxSize; 78 while (mCurrentSize > mMaxSize) 79 RemoveOldest(); 80 } 81 82 /* 83 * Remove all entries. 84 */ Clear(void)85void LogPool::Clear(void) 86 { 87 while (mpTail != NULL) 88 RemoveOldest(); 89 } 90 91