private void Execute()
{
try {
lock (this) {
// Wait 2 seconds,
Monitor.Wait(2000);
// Any new block containers added, we need to process,
List <BlockContainer> newItems = new List <BlockContainer>();
while (true)
{
lock (service.compressionAddList) {
newItems.AddRange(service.compressionAddList);
service.compressionAddList.Clear();
}
// Sort the container list,
newItems.Sort();
newItems.Reverse();
for (int i = newItems.Count - 1; i >= 0; i--)
{
BlockContainer container = newItems[i];
// If it's already compressed, remove it from the list
if (container.IsCompressed)
{
newItems.RemoveAt(i);
}
// Don't compress if written to less than 3 minutes ago,
// and we confirm it can be compressed,
else if (service.IsKnownStaticBlock(container))
{
FileBlockStore mblockStore = (FileBlockStore)container.Store;
string sourcef = mblockStore.FileName;
string destf = Path.Combine(Path.GetDirectoryName(sourcef),
Path.GetFileName(sourcef) + ".tempc");
try {
File.Delete(destf);
service.Logger.Info(String.Format("Compressing block: {0}", container.Id));
service.Logger.Info(String.Format("Current block size = {0}", sourcef.Length));
// Compress the file,
CompressedBlockStore.Compress(sourcef, destf);
// Rename the file,
string compressedf = Path.Combine(Path.GetDirectoryName(sourcef),
Path.GetFileName(sourcef) + ".mcd");
File.Move(destf, compressedf);
// Switch the block container,
container.ChangeStore(new CompressedBlockStore(container.Id, compressedf));
service.Logger.Info(String.Format("Compression of block {0} finished.", container.Id));
service.Logger.Info(String.Format("Compressed block size = {0}", compressedf.Length));
// Wait a little bit and delete the original file,
if (finished)
{
hasFinished = true;
Monitor.PulseAll(this);
return;
}
Monitor.Wait(this, 1000);
// Delete the file after 5 minutes,
new Timer(FileDelete, sourcef, 5 * 60 * 1000, Timeout.Infinite);
// Remove it from the new_items list
newItems.RemoveAt(i);
} catch (IOException e) {
service.Logger.Error("IO Error in compression thread", e);
}
}
if (finished)
{
hasFinished = true;
Monitor.PulseAll(this);
return;
}
Monitor.Wait(this, 200);
}
if (finished)
{
hasFinished = true;
Monitor.PulseAll(this);
return;
}
Monitor.Wait(this, 3000);
}
}
} catch (ThreadInterruptedException) {
// ThreadInterruptedException causes the thread to end,
}
}