/// <summary>
/// 创建一个新的网络事务
/// </summary>
/// <param name="appName">目标APP的名称</param>
/// <param name="target">标示网络终点接的协议簇组合</param>
/// <param name="maximumRspTime">等待当前网络事务RSP消息的最大时间</param>
/// <param name="resourceUri">KAE资源URI</param>
/// <param name="communicationType">通信方式</param>
/// <param name="version">
/// 目标APP的版本
/// <para>* 默认为: latest</para>
/// </param>
/// <param name="protocolSelf">
/// 使用的协议栈的角色
/// <para>* 如果当前事务代理器所承载的消息协议为MetadataContainer时请忽略此参数</para>
/// </param>
/// <returns>返回新的事务</returns>
public IMessageTransaction <TMessage> CreateTransaction(string appName, Protocols target, TimeSpan maximumRspTime, string version = "latest", KAEResourceUri resourceUri = null, NetworkCommunicationTypes communicationType = NetworkCommunicationTypes.Dulplex, string protocolSelf = null)
{
if (string.IsNullOrEmpty(appName))
{
throw new ArgumentNullException("appName");
}
string errMsg;
ApplicationLevel level = (resourceUri == null ? ApplicationLevel.Stable : _callback(resourceUri));
KAERingNode ringNode;
IServerConnectionAgent <TMessage> agent = _cluster.GetChannel(target, level, _container.GetDefaultProtocolStack(_cluster.ProtocolType), out errMsg, out ringNode);
if (agent == null)
{
lock (_lockObj)
{
//try to obtains agent object again for ensuring that the newest remoting addresses can be appliy in the multiple threading env.
agent = _cluster.GetChannel(target, level, _container.GetDefaultProtocolStack(_cluster.ProtocolType), out errMsg, out ringNode);
if (agent == null && !GetMissedRemoteAddresses(appName, version, target, level))
{
return(new FailMessageTransaction <TMessage>(errMsg));
}
agent = _cluster.GetChannel(target, level, _container.GetDefaultProtocolStack(_cluster.ProtocolType), out errMsg, out ringNode);
//check returned value again for avoiding couldnt connect to the remote address now.
if (agent == null)
{
return(new FailMessageTransaction <TMessage>(errMsg));
}
}
}
MessageTransaction <TMessage> transaction = NewTransaction(new Lease(DateTime.Now.Add(maximumRspTime)), agent.GetChannel());
transaction.SetMessageIdentity(new MessageIdentity {
ProtocolId = (byte)target.ProtocolId, ServiceId = (byte)target.ServiceId, DetailsId = (byte)target.DetailsId
});
transaction.TransactionManager = _transactionManager;
transaction.Identity = (communicationType == NetworkCommunicationTypes.Dulplex ? IdentityHelper.Create(agent.GetChannel().LocalEndPoint, TransportChannelTypes.TCP) : IdentityHelper.CreateOneway(agent.GetChannel().LocalEndPoint, TransportChannelTypes.TCP));
transaction.KPPUniqueId = ringNode.KPPUniqueId;
return(_transactionManager.Add(transaction.Identity, transaction) ? transaction : null);
}