/// <summary>
/// Aborts a transaction and releases it.
/// </summary>
/// <param name="trans">Transaction to be aborted.</param>
public void AbortTransaction(IDbTransaction trans)
{
if (trans == null)
{
return;
}
bool isRequestTransaction;
TransactionInfo transInfo = GetTransactionInfo(trans, out isRequestTransaction);
if (transInfo != null)
{
#if DEBUG_DBCONNECTIONPOOLING
OSTrace.Info("DBConnectionPooling[TID=" + transInfo.Transaction.GetHashCode() + "] - returned to pool");
OSTrace.Error(new StackTrace().ToString());
#endif
transInfo.Release();
if (isRequestTransaction)
{
RequestTransactionInfo = null;
}
else
{
TransactionPool.Remove(transInfo.Transaction);
}
transInfo.ReturnConnectionToPool();
}
}
/// <summary>
/// Releases a transaction to the pool.
/// If the transaction is poolable, it is released and put back into the pool, otherwise it is removed.
/// Throws an <see cref="InvalidTransactionReleaseException"/> if the transaction is not releasable.
/// </summary>
/// <exception cref="InvalidTransactionReleaseException">Occurs if the transaction is not releasable.</exception>
/// <param name="trans">Transaction to be released.</param>
public virtual void ReleaseTransaction(IDbTransaction trans)
{
if (trans == null)
{
return;
}
TransactionInfo transInfo = (TransactionInfo)TransactionPool[trans];
if (transInfo != null)
{
if (!transInfo.IsReleasable)
{
throw (new InvalidTransactionReleaseException("Cannot release a transaction that was created with \"GetCommitableTransaction\". Use commit or rollback"));
}
#if DEBUG_DBCONNECTIONPOOLING
OSTrace.Info("DBConnectionPooling[TID=" + transInfo.Transaction.GetHashCode() + "] - returned to pool");
OSTrace.Error(new StackTrace().ToString());
#endif
if (transInfo.IsPoolable)
{
transInfo.Release();
}
else
{
TransactionPool.Remove(trans);
}
}
else
{
try {
if (RequestTransactionInfo != null && trans == RequestTransactionInfo.Transaction)
{
//when releasing the request transaction make sure the connection is ok
if (trans.Connection != null && trans.Connection.State != ConnectionState.Open)
{
LogException(new InvalidTransactionException("Request transaction not open on release."), new StackTrace(), "Request Transaction discarded due to connection not being in a correct state.");
//clear and try to dispose connection
lock (this) {
RequestTransactionInfo = null;
}
trans.Connection.Dispose();
}
else
{
RequestTransactionInfo.MarkChange();
}
}
} catch {
//this is a best effort
}
}
}
/// <summary>
/// Ends a pooled transaction, performing additional cleanup code if necessary.
/// An error if an exception is raised.
/// </summary>
/// <param name="transInfo">Object containing information about the transaction.</param>
/// <param name="commit">If True, all transaction are committed. Otherwise, they are rolled back.</param>
/// <param name="toFreeResources">If True, all resources are released and connections returned to the pool.</param>
protected virtual void EndTransaction(TransactionInfo transInfo, bool commit, bool toFreeResources)
{
TransactionPool.Remove(transInfo.Transaction);
transInfo.Release();
try {
if (commit)
{
transInfo.Transaction.Commit();
}
else
{
transInfo.Transaction.Rollback();
}
} finally {
transInfo.ReturnConnectionToPool();
}
}
protected TransactionInfo GetAndReserveFromPoolUnchecked()
{
TransactionInfo[] transactions;
lock (TransactionPool.SyncRoot) {
transactions = TransactionPool.Values.Cast <TransactionInfo>().ToArray();
}
foreach (TransactionInfo transInfo in transactions)
{
if (transInfo.Free)
{
lock (transInfo) {
if (transInfo.Free)
{
DateTime lastChange = transInfo.LastChange;
transInfo.Reserve();
//#52135, we already have nice checks for the pooled connections
if (transInfo.Transaction.Connection == null || transInfo.Connection.State == ConnectionState.Closed)
{
// build exception report
IDbConnection shadowConnection = transInfo.Connection;
string exceptTxt = "Connection in transaction is null or closed (TransactionInfo Status: ";
try {
if (shadowConnection == null)
{
exceptTxt += "Connection=null, ";
}
else
{
exceptTxt += String.Format("Connection.State=='{0}', ", shadowConnection.State.ToString());
}
exceptTxt += String.Format("Free='{0}', CreationTime='{1}', LastChange='{2}', ReaderCount='{3}')",
transInfo.Free, transInfo.CreationTime, lastChange, transInfo.ReaderCount);
int numTransactions = transactions.Length;
int numFree = CountFreeTransactionsInPool(transactions);
exceptTxt += String.Format(". (Pool Status: Total={0}, Free={1})", numTransactions, numFree);
} catch {
} finally {
// remove and cleanup everything
TransactionPool.Remove(transInfo.Transaction);
transInfo.Transaction.Dispose();
if (transInfo.Connection != null)
{
transInfo.Connection.Dispose();
}
}
throw new InvalidTransactionException(exceptTxt);
}
else
{
#if DEBUG_DBCONNECTIONPOOLING
OSTrace.Info("DBConnectionPooling[TID=" + transInfo.Transaction.GetHashCode() + "] - reserved from pool");
OSTrace.Error(new StackTrace().ToString());
#endif
return(transInfo);
}
}
}
}
}
// No free transaction found. Add a new one and return it.
return(AddToPoolAndReserve());
}
public Task Sync()
{
return(Task.Run(async() => {
Log += "syncing..." + Environment.NewLine;
OnLogChanged();
while (true)
{
var(index, node) = Nodes.Aggregate((index: BlockChain.Last().Index, node: (Uri)null), (m, n) =>
Task.Run(async() => {
HttpResponseMessage response;
try {
response = await httpClient_.PostAsync(n, new StringContent(JsonConvert.SerializeObject(
new GetCurrentIndex {
PortNumber = PortNumber
})));
} catch (HttpRequestException) {
return m;
}
if (!response.IsSuccessStatusCode)
{
return m;
}
var res = JsonConvert.DeserializeObject <GetCurrentIndexResponse>(await response.Content.ReadAsStringAsync());
if (res.CurrentIndex <= m.index)
{
return m;
}
return (index: res.CurrentIndex, node: n);
}).Result);
if (node == null)
{
break;
}
if (index > BlockChain.Last().Index)
{
IList <Block> branch;
var currentIndex = BlockChain.Last().Index;
{
HttpResponseMessage response;
try {
response = await httpClient_.PostAsync(node, new StringContent(JsonConvert.SerializeObject(
new GetBlocks {
Index = currentIndex + 1, NumBlocks = index - currentIndex
})));
} catch (HttpRequestException) {
continue;
}
if (!response.IsSuccessStatusCode)
{
continue;
}
var res = JsonConvert.DeserializeObject <GetBlocksResponse>(await response.Content.ReadAsStringAsync());
branch = res.Blocks;
}
if (branch.First().PreviousHash == LastHash)
{
var removed = false;
foreach (var block in branch)
{
foreach (var transaction in block.Transactions)
{
if (TransactionPool.Contains(transaction))
{
TransactionPool.Remove(transaction);
removed = true;
}
}
}
if (removed)
{
OnTransactionPoolChanged();
}
BlockChain.AddRange(branch);
break;
}
while (true)
{
HttpResponseMessage response;
try {
response = await httpClient_.PostAsync(node, new StringContent(JsonConvert.SerializeObject(
new GetBlocks {
Index = currentIndex, NumBlocks = 1
})));
} catch (HttpRequestException) {
goto con;
}
if (!response.IsSuccessStatusCode)
{
goto con;
}
var res = JsonConvert.DeserializeObject <GetBlocksResponse>(await response.Content.ReadAsStringAsync());
branch.Insert(0, res.Blocks.First());
if (BlockChain[currentIndex].PreviousHash == branch.First().PreviousHash)
{
break;
}
--currentIndex;
}
BlockChain.RemoveRange(currentIndex, BlockChain.Count - currentIndex);
var removed2 = false;
foreach (var block in branch)
{
foreach (var transaction in block.Transactions)
{
if (TransactionPool.Contains(transaction))
{
TransactionPool.Remove(transaction);
removed2 = true;
}
}
}
if (removed2)
{
OnTransactionPoolChanged();
}
BlockChain.AddRange(branch);
break;
}
con:;
}
LastHash = SerializeHash(GetHash(BlockChain.Last()));
OnBlockChainChanged();
Log += "sync completed." + Environment.NewLine;
OnLogChanged();
}));
}
public async Task Remove(IEnumerable <Domain.Transaction> batch) => await TransactionPool.Remove(batch);
