/// <summary>
/// Convert a <see cref="Report" /> to a <see cref="StructuredQuery" />.
/// </summary>
/// <param name="report">The <see cref="Report" /> to convert. This cannot be null.</param>
/// <param name="settings"></param>
/// <returns>
/// The converted report.
/// </returns>
/// <exception cref="System.ArgumentNullException">report</exception>
public StructuredQuery Convert(Report report, ReportToQueryConverterSettings settings)
{
if (report == null)
{
throw new ArgumentNullException("report");
}
if (settings == null)
{
settings = ReportToQueryConverterSettings.Default;
}
StructuredQuery result;
CachingReportToQueryConverterValue cacheValue;
CachingReportToQueryConverterKey key = new CachingReportToQueryConverterKey(report, settings);
using (MessageContext msg = new MessageContext("Reports"))
{
// Check cache
bool doConvert = !TryGetValue(key, msg, out cacheValue);
// Check for force recalculation
if (settings.RefreshCachedStructuredQuery)
{
msg.Append(() => "CachingReportToQueryConverter refreshed forced");
doConvert = true;
}
if (doConvert)
{
lock (_syncRoot)
{
using (CacheContext cacheContext = new CacheContext( ))
{
result = Converter.Convert(report, settings);
cacheValue = new CachingReportToQueryConverterValue(result);
Cache.Add(key, cacheValue);
// Add the cache context entries to the appropriate CacheInvalidator
_cacheInvalidator.AddInvalidations(cacheContext, key);
}
}
}
else if (CacheContext.IsSet( ))
{
// Add the already stored changes that should invalidate this cache
// entry to any outer or containing cache contexts.
using (CacheContext cacheContext = CacheContext.GetContext( ))
{
cacheContext.AddInvalidationsFor(_cacheInvalidator, key);
}
}
}
result = cacheValue.StructuredQuery;
return(result);
}
/// <summary>
/// Try to get the value from cache, with logging.
/// </summary>
private bool TryGetValue(CachingReportToQueryConverterKey key, MessageContext msg, out CachingReportToQueryConverterValue result)
{
msg.Append(() => "CachingReportToQueryConverter key:" + key);
CachingReportToQueryConverterValue cacheValue;
bool foundValue;
if (Cache.TryGetValue(key, out cacheValue))
{
msg.Append(() => "CachingReportToQueryConverter cache hit");
msg.Append(() => $"Entry originally cached at {cacheValue.CacheTime}");
result = cacheValue;
foundValue = true;
}
else
{
msg.Append(() => "CachingReportToQueryConverter cache miss");
result = null;
foundValue = false;
}
return(foundValue);
}
