public CachePage GetLastPage(Txn txn)
{
uint pgNo = 0;
IntPtr data = GetPage(ref pgNo, txn, CachePageGetFlags.Last);
return(new CachePage(pgNo, data));
}
public CachePage GetPage(int pageNo, Txn txn, bool create)
{
uint pgNo = unchecked ((uint)pageNo);
IntPtr data = GetPage(ref pgNo, txn, create ? CachePageGetFlags.Create : CachePageGetFlags.None);
return(new CachePage(pgNo, data));
}
public Int64 Get(Txn txn, Int32 delta, ReadFlags flags)
{
if (txn != null)
{
lock (txn.rscLock) {
DB_TXN *txp = txn.CheckDisposed();
return(Get(txp, delta, flags));
}
}
else
{
return(Get((DB_TXN *)null, delta, flags));
}
}
IntPtr GetPage(ref uint pageNo, Txn txn, CachePageGetFlags flags)
{
if (txn != null)
{
lock (txn.rscLock) {
DB_TXN *txp = txn.CheckDisposed();
return((IntPtr)GetPage(ref pageNo, txp, flags));
}
}
else
{
return((IntPtr)GetPage(ref pageNo, (DB_TXN *)null, flags));
}
}
public void Open(Txn txn, ref DbEntry key, OpenFlags flags)
{
DbRetVal ret;
if (txn != null)
{
lock (txn.rscLock) {
DB_TXN *txp = txn.CheckDisposed();
ret = Open(txp, ref key, flags);
}
}
else
{
ret = Open((DB_TXN *)null, ref key, flags);
}
Util.CheckRetVal(ret);
}
public void Remove(Txn txn, RemoveFlags flags)
{
DbRetVal ret;
if (txn != null)
{
lock (txn.rscLock) {
DB_TXN *txp = txn.CheckDisposed();
ret = Remove(txp, flags);
}
}
else
{
ret = Remove((DB_TXN *)null, flags);
}
GC.SuppressFinalize(this);
Util.CheckRetVal(ret);
}
public CachePage GetLastPage(Txn txn) {
uint pgNo = 0;
IntPtr data = GetPage(ref pgNo, txn, CachePageGetFlags.Last);
return new CachePage(pgNo, data);
}
public CachePage GetPage(int pageNo, Txn txn, bool create) {
uint pgNo = unchecked((uint)pageNo);
IntPtr data = GetPage(ref pgNo, txn, create ? CachePageGetFlags.Create : CachePageGetFlags.None);
return new CachePage(pgNo, data);
}
IntPtr GetPage(ref uint pageNo, Txn txn, CachePageGetFlags flags) {
if (txn != null) {
lock (txn.rscLock) {
DB_TXN* txp = txn.CheckDisposed();
return (IntPtr)GetPage(ref pageNo, txp, flags);
}
}
else
return (IntPtr)GetPage(ref pageNo, (DB_TXN*)null, flags);
}
public void LogPrintFile(Txn txn, string msg) {
byte[] msgBytes = null;
int count = Util.StrToUtf8(msg, ref msgBytes);
if (txn != null) {
lock (txn.rscLock) {
DB_TXN* txp = txn.CheckDisposed();
LogPrintFile(txp, msgBytes);
}
}
else
LogPrintFile(null, msgBytes);
}
public void TxnCheckpoint(int kBytes, int minutes, Txn.CheckpointMode mode) {
DbRetVal ret;
lock (rscLock) {
DB_ENV* evp = CheckDisposed();
unchecked {
ret = evp->TxnCheckpoint(evp, (UInt32)kBytes, (UInt32)minutes, (UInt32)mode);
}
}
Util.CheckRetVal(ret);
}
public void Remove(Txn txn, RemoveFlags flags) {
DbRetVal ret;
if (txn != null) {
lock (txn.rscLock) {
DB_TXN* txp = txn.CheckDisposed();
ret = Remove(txp, flags);
}
}
else
ret = Remove((DB_TXN*)null, flags);
GC.SuppressFinalize(this);
Util.CheckRetVal(ret);
}
public void DbRename(Txn txn, string file, string database, string newname, WriteFlags flags) {
byte[] fBytes = null;
Util.StrToUtf8(file, ref fBytes);
byte[] dBytes = null;
Util.StrToUtf8(database, ref dBytes);
byte[] nBytes = null;
Util.StrToUtf8(newname, ref nBytes);
DbRetVal ret;
// lock environement first, to avoid deadlocks
lock (rscLock) {
if (txn != null) {
lock (txn.rscLock) {
DB_TXN* txp = txn.CheckDisposed();
ret = DbRename(txp, fBytes, dBytes, nBytes, flags);
}
}
else
ret = DbRename(null, fBytes, dBytes, nBytes, flags);
}
Util.CheckRetVal(ret);
}
// requires synchronization lock on rscLock
internal bool RemoveTransaction(Txn txn) {
return transactions.Remove(txn);
}
public Txn CdsGroupBegin() {
Txn txn = new Txn(this);
DbRetVal ret;
lock (rscLock) {
RuntimeHelpers.PrepareConstrainedRegions();
try { }
finally {
DB_TXN* txp;
DB_ENV* evp = CheckDisposed();
ret = evp->CdsGroupBegin(evp, out txp);
if (ret == DbRetVal.SUCCESS) {
txn.Initialize(txp);
transactions.Insert(txn);
}
}
}
Util.CheckRetVal(ret);
return txn;
}
public void Open(Txn txn, ref DbEntry key, OpenFlags flags) {
DbRetVal ret;
if (txn != null) {
lock (txn.rscLock) {
DB_TXN* txp = txn.CheckDisposed();
ret = Open(txp, ref key, flags);
}
}
else
ret = Open((DB_TXN*)null, ref key, flags);
Util.CheckRetVal(ret);
}
public Int64 Get(Txn txn, Int32 delta, ReadFlags flags) {
if (txn != null) {
lock (txn.rscLock) {
DB_TXN* txp = txn.CheckDisposed();
return Get(txp, delta, flags);
}
}
else
return Get((DB_TXN*)null, delta, flags);
}
// must be called under an environment and parent lock
DbRetVal TxnBegin(DB_TXN* parxp, Txn txn, Txn.BeginFlags flags) {
DbRetVal ret;
RuntimeHelpers.PrepareConstrainedRegions();
try { }
finally {
DB_TXN* txp;
DB_ENV* evp = CheckDisposed();
ret = evp->TxnBegin(evp, parxp, out txp, unchecked((UInt32)flags));
if (ret == DbRetVal.SUCCESS) {
txn.Initialize(txp);
transactions.Insert(txn);
}
}
return ret;
}
/// <summary>
/// ��ʼ��
/// </summary>
private void Init()
{
env = new Env(EnvCreateFlags.None);
Env.OpenFlags envFlags =
Env.OpenFlags.Create |
Env.OpenFlags.InitLock |
Env.OpenFlags.InitLog |
Env.OpenFlags.InitMPool |
Env.OpenFlags.InitTxn |
Env.OpenFlags.Recover;
env.Open(directory, envFlags, 0);
txn = env.TxnBegin(null, Txn.BeginFlags.None);
db = env.CreateDatabase(DbCreateFlags.None);
btree = (DbHash)db.Open(txn, dbName, null, DbType.Hash, Db.OpenFlags.Create, 0);
}
public Txn TxnBegin(Txn parent, Txn.BeginFlags flags) {
Txn txn = new Txn(this);
DbRetVal ret;
// lock environement first, to avoid deadlocks
lock (rscLock) {
if (parent != null) {
lock (parent.rscLock) {
DB_TXN* parxp = parent.CheckDisposed();
ret = TxnBegin(parxp, txn, flags);
}
}
else
ret = TxnBegin(null, txn, flags);
}
Util.CheckRetVal(ret);
return txn;
}
