/// <summary>Read the cache file into memory.</summary>
/// <remarks>Read the cache file into memory.</remarks>
/// <exception cref="System.IO.IOException">System.IO.IOException</exception>
public virtual void Read()
{
changed = false;
statDirty = false;
if (!cacheFile.Exists())
{
header = null;
entries.Clear();
lastCacheTime = 0;
return;
}
cache = new RandomAccessFile(cacheFile, "r");
try
{
FileChannel channel = cache.GetChannel();
ByteBuffer buffer = ByteBuffer.AllocateDirect((int)cacheFile.Length());
buffer.Order(ByteOrder.BIG_ENDIAN);
int j = channel.Read(buffer);
if (j != buffer.Capacity())
{
throw new IOException(MessageFormat.Format(JGitText.Get().couldNotReadIndexInOneGo
, j, buffer.Capacity()));
}
buffer.Flip();
header = new GitIndex.Header(buffer);
entries.Clear();
for (int i = 0; i < header.entries; ++i)
{
GitIndex.Entry entry = new GitIndex.Entry(this, buffer);
GitIndex.Entry existing = entries.Get(entry.name);
entries.Put(entry.name, entry);
if (existing != null)
{
entry.stages |= existing.stages;
}
}
lastCacheTime = cacheFile.LastModified();
}
finally
{
cache.Close();
}
}
/// <summary>Write content of index to disk.</summary>
/// <remarks>Write content of index to disk.</remarks>
/// <exception cref="System.IO.IOException">System.IO.IOException</exception>
public virtual void Write()
{
CheckWriteOk();
FilePath tmpIndex = new FilePath(cacheFile.GetAbsoluteFile() + ".tmp");
FilePath Lock = new FilePath(cacheFile.GetAbsoluteFile() + ".lock");
if (!Lock.CreateNewFile())
{
throw new IOException(JGitText.Get().indexFileIsInUse);
}
try
{
FileOutputStream fileOutputStream = new FileOutputStream(tmpIndex);
FileChannel fc = fileOutputStream.GetChannel();
ByteBuffer buf = ByteBuffer.Allocate(4096);
MessageDigest newMessageDigest = Constants.NewMessageDigest();
header = new GitIndex.Header(entries);
header.Write(buf);
buf.Flip();
newMessageDigest.Update(((byte[])buf.Array()), buf.ArrayOffset(), buf.Limit());
fc.Write(buf);
buf.Flip();
buf.Clear();
for (Iterator i = entries.Values.Iterator(); i.HasNext();)
{
GitIndex.Entry e = (GitIndex.Entry)i.Next();
e.Write(buf);
buf.Flip();
newMessageDigest.Update(((byte[])buf.Array()), buf.ArrayOffset(), buf.Limit());
fc.Write(buf);
buf.Flip();
buf.Clear();
}
buf.Put(newMessageDigest.Digest());
buf.Flip();
fc.Write(buf);
fc.Close();
fileOutputStream.Close();
if (cacheFile.Exists())
{
if (db.FileSystem.RetryFailedLockFileCommit())
{
// file deletion fails on windows if another
// thread is reading the file concurrently
// So let's try 10 times...
bool deleted = false;
for (int i_1 = 0; i_1 < 10; i_1++)
{
if (cacheFile.Delete())
{
deleted = true;
break;
}
try
{
Sharpen.Thread.Sleep(100);
}
catch (Exception)
{
}
}
// ignore
if (!deleted)
{
throw new IOException(JGitText.Get().couldNotRenameDeleteOldIndex);
}
}
else
{
if (!cacheFile.Delete())
{
throw new IOException(JGitText.Get().couldNotRenameDeleteOldIndex);
}
}
}
if (!tmpIndex.RenameTo(cacheFile))
{
throw new IOException(JGitText.Get().couldNotRenameTemporaryIndexFileToIndex);
}
changed = false;
statDirty = false;
lastCacheTime = cacheFile.LastModified();
db.FireEvent(new IndexChangedEvent());
}
finally
{
if (!Lock.Delete())
{
throw new IOException(JGitText.Get().couldNotDeleteLockFileShouldNotHappen);
}
if (tmpIndex.Exists() && !tmpIndex.Delete())
{
throw new IOException(JGitText.Get().couldNotDeleteTemporaryIndexFileShouldNotHappen
);
}
}
}
