protected T GetChecked <T>(LibFunc <T, DbRetCode> libFunc)
{
var handle = CheckDisposed();
var ret = libFunc(handle, out T result);
ErrorUtil.CheckRetCode(ret);
return(result);
}
/// <summary>Constructor.</summary>
/// <param name="config">Configuration to use.</param>
public LmdbEnvironment(LmdbEnvironmentConfiguration config = null)
{
// so that we can refer back to the Environment instance
instanceHandle = GCHandle.Alloc(this, GCHandleType.WeakTrackResurrection);
DbRetCode ret;
RuntimeHelpers.PrepareConstrainedRegions();
try { /* */ }
finally {
IntPtr envHandle;
ret = DbLib.mdb_env_create(out envHandle);
if (ret == DbRetCode.SUCCESS)
{
var ret2 = DbLib.mdb_env_set_userctx(envHandle, (IntPtr)instanceHandle);
if (ret2 == DbRetCode.SUCCESS)
{
this.env = envHandle;
}
else
{
ret = ret2;
DbLib.mdb_env_close(envHandle);
}
}
}
ErrorUtil.CheckRetCode(ret);
if (config != null)
{
this.autoReduceMapSizeIn32BitProcess = config.AutoReduceMapSizeIn32BitProcess;
if (config.MapSize.HasValue)
{
this.SetMapSize(config.MapSize.Value);
}
if (config.MaxDatabases.HasValue)
{
this.MaxDatabases = config.MaxDatabases.Value;
}
if (config.MaxReaders.HasValue)
{
this.MaxReaders = config.MaxReaders.Value;
}
}
}
/// <summary>
/// Commit all the operations of a transaction into the database.
/// The transaction handle is freed. It and its cursors must not be used again after this call, except with mdb_cursor_renew().
/// Note: Earlier documentation incorrectly said all cursors would be freed. Only write-transactions free cursors.
/// </summary>
public void Commit()
{
// we check here, as we dont want to throw an exception later, but won't use this handle.
var currentHandle = CheckDisposed();
// now we use atomic access to the handle
var handle = Interlocked.Exchange(ref txn, IntPtr.Zero);
// if the txn handle was valid before we cleared it, lets close the handle
if (handle != IntPtr.Zero)
{
var txnId = DbLib.mdb_txn_id(handle);
var ret = DbLib.mdb_txn_commit(handle);
// whether the call succeeded or not, the transaction cannot be re-used.
ReleaseManagedResources(true);
disposed?.Invoke(txnId);
ErrorUtil.CheckRetCode(ret);
Committed();
}
}
