/// <summary>
/// Obtains lock on store file so that we can ensure the store is not shared between database instances
/// <para>
/// Creates store dir if necessary, creates store lock file if necessary
/// </para>
/// <para>
/// Please note that this lock is only valid for as long the <seealso cref="storeLockFileChannel"/> lives, so make sure the
/// lock cannot be garbage collected as long as the lock should be valid.
///
/// </para>
/// </summary>
/// <exception cref="StoreLockException"> if lock could not be acquired </exception>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public void checkLock() throws org.neo4j.kernel.StoreLockException
public virtual void CheckLock()
{
if (HaveLockAlready())
{
return;
}
try
{
if (!FileSystemAbstraction.fileExists(StoreLockFile))
{
FileSystemAbstraction.mkdirs(StoreLockFile.ParentFile);
}
}
catch (IOException e)
{
string message = "Unable to create path for store dir: " + StoreLockFile.Parent;
throw StoreLockException(message, e);
}
try
{
if (_storeLockFileChannel == null)
{
_storeLockFileChannel = FileSystemAbstraction.open(StoreLockFile, OpenMode.READ_WRITE);
}
StoreLockFileLock = _storeLockFileChannel.tryLock();
if (StoreLockFileLock == null)
{
string message = "Store and its lock file has been locked by another process: " + StoreLockFile;
throw StoreLockException(message, null);
}
}
catch (Exception e) when(e is OverlappingFileLockException || e is IOException)
{
throw UnableToObtainLockException();
}
}