/// <summary>
/// Sets a new start line in the given buffer and updates the LRU cache, if the buffer
/// is present in the cache. The caller must have write lock for 'lruCacheDictLock';
/// </summary>
/// <param name="logBuffer"></param>
/// <param name="newLineNum"></param>
private void SetNewStartLineForBuffer(LogBuffer logBuffer, int newLineNum)
{
Util.AssertTrue(_lruCacheDictLock.IsWriterLockHeld, "No writer lock for lru cache");
if (_lruCacheDict.ContainsKey(logBuffer.StartLine))
{
_lruCacheDict.Remove(logBuffer.StartLine);
logBuffer.StartLine = newLineNum;
LogBufferCacheEntry cacheEntry = new LogBufferCacheEntry();
cacheEntry.LogBuffer = logBuffer;
_lruCacheDict.Add(logBuffer.StartLine, cacheEntry);
}
else
{
logBuffer.StartLine = newLineNum;
}
}
private void UpdateLruCache(LogBuffer logBuffer)
{
LogBufferCacheEntry cacheEntry;
_lruCacheDictLock.AcquireReaderLock(Timeout.Infinite);
if (_lruCacheDict.TryGetValue(logBuffer.StartLine, out cacheEntry))
{
cacheEntry.Touch();
}
else
{
LockCookie cookie = _lruCacheDictLock.UpgradeToWriterLock(Timeout.Infinite);
if (!_lruCacheDict.TryGetValue(logBuffer.StartLine, out cacheEntry)) // #536: re-test, because multiple threads may have been waiting for writer lock
{
cacheEntry = new LogBufferCacheEntry();
cacheEntry.LogBuffer = logBuffer;
try
{
_lruCacheDict.Add(logBuffer.StartLine, cacheEntry);
}
catch (ArgumentException e)
{
#if DEBUG
// there seems to be a bug with double added key
Logger.logError(string.Format("Error in LRU cache: {0}", e.Message));
Logger.logInfo("Added buffer:");
DumpBufferInfos(logBuffer);
LogBufferCacheEntry exisingEntry;
if (_lruCacheDict.TryGetValue(logBuffer.StartLine, out exisingEntry))
{
Logger.logInfo("Existing buffer: ");
DumpBufferInfos(exisingEntry.LogBuffer);
}
else
{
Logger.logWarn("Ooops? Cannot find the already existing entry in LRU.");
}
#endif
_lruCacheDictLock.ReleaseLock();
throw e;
}
}
_lruCacheDictLock.DowngradeFromWriterLock(ref cookie);
}
_lruCacheDictLock.ReleaseReaderLock();
}
