protected override IBlockStore GetBlockStore(BlockId blockId)
{
// If it's not found in the map,
// Turn the block id into a filename,
string blockFname = FormatFileName(blockId);
string blockFileName = Path.Combine(path, blockFname + ".mcd");
IBlockStore blockStore;
if (!File.Exists(blockFileName))
{
blockFileName = Path.Combine(path, blockFname);
blockStore = new FileBlockStore(blockId, blockFileName);
}
else
{
blockStore = new CompressedBlockStore(blockId, blockFileName);
}
return(blockStore);
}
protected override BlockContainer LoadBlock(long blockId)
{
// If it's not found in the map,
// Turn the block id into a filename,
String block_fname = blockId.ToString();
string block_file_name = Path.Combine(path, block_fname + ".mcd");
IBlockStore block_store;
if (!File.Exists(block_file_name)) {
block_file_name = Path.Combine(path, block_fname);
// If this file doesn't exist,
if (!File.Exists(block_file_name)) {
// We check if the block_id is less than maximum id. If it is we
// generate an exception indicating this block doesn't exist on this
// service. This means something screwed up, either the manager service
// was erroneously told the block was located on this service but it
// isn't, or the file was deleted by the user.
if (blockId < LastBlockId)
throw new BlockReadException("Block " + blockId + " not stored on service");
}
block_store = new FileBlockStore(blockId, block_file_name);
} else {
block_store = new CompressedBlockStore(blockId, block_file_name);
}
// Make the block container object,
BlockContainer container = new BlockContainer(blockId, block_store);
// Add the new container to the control list (used by the compression
// thread).
lock (compressionAddList) {
compressionAddList.Add(container);
}
return container;
}
protected override IBlockStore GetBlockStore(BlockId blockId)
{
// If it's not found in the map,
// Turn the block id into a filename,
string blockFname = FormatFileName(blockId);
string blockFileName = Path.Combine(path, blockFname + ".mcd");
IBlockStore blockStore;
if (!File.Exists(blockFileName)) {
blockFileName = Path.Combine(path, blockFname);
blockStore = new FileBlockStore(blockId, blockFileName);
} else {
blockStore = new CompressedBlockStore(blockId, blockFileName);
}
return blockStore;
}
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,
}
}