private static ExternalAnnotationsCache TryGetCacheFromDisk()
{
try
{
if (File.Exists(CachePath))
{
MessagePackSerializer <ExternalAnnotationsCache> serializer =
SerializationContext.Default.GetSerializer <ExternalAnnotationsCache>();
using (FileStream stream = File.OpenRead(CachePath))
{
using (new CodeTimer("ExternalAnnotationsCache:Read"))
{
ExternalAnnotationsCache result = serializer.Unpack(stream);
if (result.ExternalAnnotations.Any())
{
return(result);
}
}
}
}
}
catch (UnauthorizedAccessException)
{
}
catch (IOException)
{
}
return(null);
}
private static void SaveToDisk([NotNull] ExternalAnnotationsCache cache)
{
EnsureDirectoryExists();
MessagePackSerializer <ExternalAnnotationsCache> serializer =
SerializationContext.Default.GetSerializer <ExternalAnnotationsCache>();
using (FileStream stream = File.Create(CachePath))
{
using (new CodeTimer("ExternalAnnotationsCache:Write"))
{
serializer.Pack(stream, cache);
}
}
}
private static ExternalAnnotationsMap GetCached()
{
ExternalAnnotationsCache cached = TryGetCacheFromDisk();
DateTime highestLastWriteTimeUtcOnDisk = cached != null?GetHighestLastWriteTimeUtc() : DateTime.MinValue;
if (cached == null || cached.LastWriteTimeUtc != highestLastWriteTimeUtcOnDisk)
{
using (new CodeTimer("ExternalAnnotationsCache:Create"))
{
cached = ScanForMemberExternalAnnotations();
TrySaveToDisk(cached);
}
}
return(cached.ExternalAnnotations);
}
private static void TrySaveToDisk([NotNull] ExternalAnnotationsCache cache)
{
try
{
EnsureDirectoryExists();
using (FileStream stream = File.Create(CachePath))
{
using (new CodeTimer("ExternalAnnotationsCache:Write"))
{
var service = new MsgPackSerializationService();
service.WriteObject(cache, stream);
}
}
}
catch (IOException)
{
// When MSBuild runs in parallel, another process may be writing the cache file at the same time.
}
}
private static void TrySaveToDisk([NotNull] ExternalAnnotationsCache cache)
{
try
{
EnsureDirectoryExists();
MessagePackSerializer <ExternalAnnotationsCache> serializer =
SerializationContext.Default.GetSerializer <ExternalAnnotationsCache>();
using (FileStream stream = File.Create(CachePath))
{
using (new CodeTimer("ExternalAnnotationsCache:Write"))
{
serializer.Pack(stream, cache);
}
}
}
catch (IOException)
{
// When MSBuild runs in parallel, another process may be writing the cache file at the same time.
}
}
private static ExternalAnnotationsMap GetCached()
{
// The lock prevents IOException (process cannot access file) when host executes analyzers in parallel.
lock (LockObject)
{
ExternalAnnotationsCache cached = TryGetCacheFromDisk();
DateTime highestLastWriteTimeUtcOnDisk = cached != null
? GetHighestLastWriteTimeUtc()
: DateTime.MinValue;
if (cached == null || cached.LastWriteTimeUtc != highestLastWriteTimeUtcOnDisk)
{
using (new CodeTimer("ExternalAnnotationsCache:Create"))
{
cached = ScanForMemberExternalAnnotations();
TrySaveToDisk(cached);
}
}
return(cached.ExternalAnnotations);
}
}
