// *** ISearchEngineCache interface implementation ***
public bool GetFromCache(string source, Language language, string query, int maxSize, ref long totalHits, ref SearchEngineResultSet resultSet)
{
Utils.ThrowException(source == null ? new ArgumentNullException("source") : null);
Utils.ThrowException(query == null ? new ArgumentNullException("query") : null);
Utils.ThrowException(maxSize < 0 ? new ArgumentOutOfRangeException("maxSize") : null);
string normalizedQuery = string.Format("{0} {1} {2}", source, language, NormalizeQuery == null ? query : NormalizeQuery(query));
if (mCache.ContainsKey(normalizedQuery))
{
CacheRecord cacheRecord = mCache[normalizedQuery];
if (mTtl == 0 || DateTime.Now.Subtract(cacheRecord.TimeStamp).TotalDays <= mTtl) // record is not outdated
{
if (cacheRecord.TotalHits == cacheRecord.ActualSize || maxSize <= cacheRecord.ActualSize)
{
totalHits = cacheRecord.TotalHits;
XmlTextReader xmlReader = new XmlTextReader(new StringReader(cacheRecord.ResultSetXml));
resultSet = new SearchEngineResultSet(xmlReader, maxSize);
mLogger.Trace("GetFromCache", "Cache hit.");
return true;
}
}
}
mLogger.Trace("GetFromCache", "Cache miss.");
return false;
}
public void PutIntoCache(string source, Language language, string query, long totalHits, SearchEngineResultSet resultSet)
{
Utils.ThrowException(source == null ? new ArgumentNullException("source") : null);
Utils.ThrowException(query == null ? new ArgumentNullException("query") : null);
Utils.ThrowException(resultSet == null ? new ArgumentNullException("resultSet") : null);
Utils.ThrowException(totalHits < resultSet.Count ? new ArgumentValueException("totalHits") : null);
string normalizedQuery = string.Format("{0} {1} {2}", source, language, NormalizeQuery == null ? query : NormalizeQuery(query));
int actualSize = resultSet.Count;
CacheRecord cacheRecord = new CacheRecord();
cacheRecord.TotalHits = totalHits;
cacheRecord.ActualSize = resultSet.Count;
StringWriter stringWriter = new StringWriter();
XmlTextWriter xmlWriter = new XmlTextWriter(stringWriter);
xmlWriter.Formatting = Formatting.Indented;
resultSet.SaveXml(xmlWriter);
cacheRecord.ResultSetXml = stringWriter.ToString();
cacheRecord.TimeStamp = DateTime.Now;
if (mCache.ContainsKey(normalizedQuery))
{
mCache[normalizedQuery] = cacheRecord;
}
else
{
mCache.Add(normalizedQuery, cacheRecord);
}
}
