/// <summary>
/// 连接容器内部方法，子类可以重写此方法。
/// <para>*此方法主要用于确保在使用指定算法获取容器中连接之前，连接容器内部拥有足够多的连接</para>
/// <para>*具体策略为优先保证在同步执行代码的情况下，当前连接容器中最少有一个存活的连接，至于剩下的连接需要异步进行创建</para>
/// </summary>
protected virtual bool MakeSureConnections()
{
if (_connections.Count >= _min || _connections.Count == 1)
{
return(true);
}
lock (_lockObj)
{
try
{
IServerConnectionAgent <T> agent = _createFunc(_tuple.Item1, _tuple.Item2, _tuple.Item3);
//如果当前时间点无法正常创建一个连接代理器，则放弃此次同步机会并改为异步进行
if (agent == null || !agent.GetChannel().IsConnected)
{
return(false);
}
Register(agent);
return(true);
}
catch (System.Exception ex)
{
_tracing.Error(ex);
return(false);
}
finally
{
if (_connections.Count < _max && Interlocked.CompareExchange(ref _usedBackendThread, 1, 0) == 0)
{
CreateAgentAsync();
}
}
}
}
/// <summary>
/// 根据当前负载器规则获取一个通信信道
/// </summary>
/// <param name="target">标示网络终点接的协议簇组合</param>
/// <param name="level">KAE应用等级</param>
/// <param name="protocolStack">协议栈</param>
/// <param name="errMsg">错误信息</param>
/// <param name="selectedRingNode">已选中的一致性HASH圆环节点</param>
/// <returns>如果指定条件的通信信道不存在，则会创建它并返回</returns>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public IServerConnectionAgent <TMessage> GetChannel(Protocols target, ApplicationLevel level, IProtocolStack protocolStack, out string errMsg, out KAERingNode selectedRingNode)
{
lock (_lockObj)
{
IDictionary <ApplicationLevel, IDictionary <ProtocolTypes, KetamaRing> > firstLevel;
if (_addresses.TryGetValue(target, out firstLevel))
{
IDictionary <ProtocolTypes, KetamaRing> secondLevel;
if (firstLevel.TryGetValue(level, out secondLevel))
{
KetamaRing ring;
if (secondLevel.TryGetValue(_protocolType, out ring))
{
if (ring == null)
{
errMsg = string.Format("#Sadly, We have no more network information about what you gave of protocol: {0}-{1}-{2}, Maybe it was been removed or there wasn't any available network resources.", target.ProtocolId, target.ServiceId, target.DetailsId);
selectedRingNode = null;
return(null);
}
KAERingNode node = ring.GetWorkerNode();
IServerConnectionAgent <TMessage> agent = _connectionPool.GetChannel(node.EndPoint, node.RawAddress, protocolStack, _transactionManager);
errMsg = (agent != null ? string.Empty : "#Sadly, We cannot connect to remote endpoint: " + node.RawAddress);
selectedRingNode = node;
return(agent);
}
}
}
errMsg = string.Format("#Couldn't find any remoting address which it can access it. #Protocol: {0}, #Level: {1}", target, level);
selectedRingNode = null;
return(null);
}
}
//agent disconnect event handler.
private void ServerAgentDisconnected(object sender, System.EventArgs e)
{
IServerConnectionAgent <T> agent = (IServerConnectionAgent <T>)sender;
agent.Disconnected -= ServerAgentDisconnected;
lock (_lockObj) _connections.Remove(agent);
AgentDisconnectedHandler(new LightSingleArgEventArgs <IServerConnectionAgent <T> >(agent));
}
void Disconnected(object sender, System.EventArgs e)
{
IServerConnectionAgent <BaseMessage> agent = (IServerConnectionAgent <BaseMessage>)sender;
agent.Disconnected -= Disconnected;
agent.NewTransaction -= NewTransaction;
lock (_lockObj) _agents.Remove(agent);
}
/// <summary>
/// 注册一个连接代理器
/// </summary>
/// <param name="agent">连接代理器</param>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public void Regist(IServerConnectionAgent <BaseMessage> agent)
{
if (agent == null)
{
throw new ArgumentNullException(nameof(agent));
}
lock (_lockObj) _agents.Add(agent);
agent.Disconnected += Disconnected;
agent.NewTransaction += NewTransaction;
}
/// <summary>
/// 创建一个新的事务
/// </summary>
/// <param name="role">针对的服务角色</param>
/// <param name="userId">需要定位的用户编号</param>
/// <returns>返回新的事务</returns>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public BusinessMessageTransaction CreateTransaction(string role, int userId)
{
if (string.IsNullOrEmpty(role))
{
throw new ArgumentNullException("role");
}
string errMsg;
IServerConnectionAgent <BaseMessage> agent = _clsuter.GetChannelBySpecificCondition(role, _protocolStacks[role], userId, out errMsg);
return(agent == null
? new FailMobiSageMessageTransaction(errMsg)
: _transactionManager.Create(IdentityHelper.Create((IPEndPoint)agent.GetChannel().LocalEndPoint), agent.GetChannel()));
}
/// <summary>
/// 创建一个新的事务
/// </summary>
/// <param name="role">针对的服务角色</param>
/// <returns>返回新的事务</returns>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public MetadataMessageTransaction CreateMetadataTransaction(string role)
{
if (string.IsNullOrEmpty(role))
{
throw new ArgumentNullException("role");
}
string errMsg;
IServerConnectionAgent <MetadataContainer> agent = _metadataCluster.GetChannel(role, _metadataProtocolStack, out errMsg);
return(agent == null
? new FailMobiSageMetadataTransaction(errMsg)
: _metadataTransactionManager.Create(IdentityHelper.Create((IPEndPoint)agent.GetChannel().LocalEndPoint), agent.GetChannel()));
}
/// <summary>
/// 向当前的连接容器中注册一个存活的连接
/// </summary>
/// <param name="agent"></param>
public virtual void Register(IServerConnectionAgent <T> agent)
{
if (agent == null)
{
return;
}
if (!agent.GetChannel().IsConnected)
{
AgentDisconnectedHandler(new LightSingleArgEventArgs <IServerConnectionAgent <T> >(agent));
return;
}
agent.Disconnected += ServerAgentDisconnected;
lock (_lockObj) _connections.Add(agent);
}
/// <summary>
/// 创建一个新的单向通信事务
/// <para>* 使用此函数创建的事务是单向通信的，也就意味着新的事务不会触发RecvRsp事件</para>
/// </summary>
/// <param name="role">针对的服务角色</param>
/// <returns>返回新的事务</returns>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public BusinessMessageTransaction CreateOnewayTransaction(string role)
{
if (string.IsNullOrEmpty(role))
{
throw new ArgumentNullException("role");
}
string errMsg;
IServerConnectionAgent <BaseMessage> agent = _clsuter.GetChannel(role, _protocolStacks[role], out errMsg);
return(agent == null
? new FailMobiSageMessageTransaction(errMsg)
: new BusinessMessageTransaction(new Lease(DateTime.MaxValue), agent.GetChannel())
{
Identity = IdentityHelper.CreateOneway((IPEndPoint)agent.GetChannel().LocalEndPoint)
});
}
/// <summary>
/// 创建一个新的事务
/// <para>* 按照固定手机号的负载策略</para>
/// </summary>
/// <param name="targetRole">针对的服务角色</param>
/// <param name="protocolSelf">使用的协议栈</param>
/// <param name="mobileNo">手机号</param>
/// <returns>返回新的事务</returns>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public BusinessMessageTransaction CreateTransaction(string targetRole, string protocolSelf, long mobileNo)
{
if (string.IsNullOrEmpty(targetRole))
{
throw new ArgumentNullException("targetRole");
}
if (string.IsNullOrEmpty(protocolSelf))
{
throw new ArgumentNullException("protocolSelf");
}
string errMsg;
IServerConnectionAgent <BaseMessage> agent = _clsuter.GetChannelBySpecificCondition(targetRole, _protocolStacks[protocolSelf], mobileNo, out errMsg);
return(agent == null
? new FailMobiSageMessageTransaction(errMsg)
: _transactionManager.Create(IdentityHelper.Create((IPEndPoint)agent.GetChannel().LocalEndPoint), agent.GetChannel()));
}
/// <summary>
/// 创建一个新的单向通信事务
/// <para>* 使用此函数创建的事务是单向通信的，也就意味着新的事务不会触发RecvRsp事件</para>
/// </summary>
/// <param name="targetRole">针对的服务角色</param>
/// <param name="protocolSelf">使用的协议栈</param>
/// <param name="userId">需要定位的用户编号</param>
/// <returns>返回新的事务</returns>
/// <exception cref="ArgumentNullException">参数不能为空</exception>
public BusinessMessageTransaction CreateOnewayTransaction(string targetRole, string protocolSelf, int userId)
{
if (string.IsNullOrEmpty(targetRole))
{
throw new ArgumentNullException("targetRole");
}
if (string.IsNullOrEmpty(protocolSelf))
{
throw new ArgumentNullException("protocolSelf");
}
string errMsg;
IServerConnectionAgent <BaseMessage> agent = _clsuter.GetChannelBySpecificCondition(protocolSelf, _protocolStacks[protocolSelf], userId, out errMsg);
return(agent == null
? new FailMobiSageMessageTransaction(errMsg)
: new BusinessMessageTransaction(new Lease(DateTime.MaxValue), agent.GetChannel())
{
Identity = IdentityHelper.CreateOneway((IPEndPoint)agent.GetChannel().LocalEndPoint)
});
}
/// <summary>
/// 使用后台线程的方式异步地创建连接代理器
/// </summary>
private void CreateAgentAsync()
{
if (_backendThread != null)
{
return;
}
_backendThread = new Thread(delegate()
{
int retryCount = 0;
while (_connections.Count < _max)
{
try
{
IServerConnectionAgent <T> agent = _createFunc(_tuple.Item1, _tuple.Item2, _tuple.Item3);
//如果当前时间点无法正常创建一个连接代理器，则默认行为是重试3次
if (agent == null || !agent.GetChannel().IsConnected)
{
if (retryCount < 3)
{
retryCount++;
continue;
}
Interlocked.Exchange(ref _usedBackendThread, 0);
_backendThread = null;
break;
}
//reset retry counter.
retryCount = 0;
Register(agent);
}
catch (System.Exception ex) { _tracing.Error(ex); }
}
Interlocked.Exchange(ref _usedBackendThread, 0);
_backendThread = null;
})
{
IsBackground = true, Name = "ConnectionSet-Backend-Thread"
};
_backendThread.Start();
}
/// <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="balanceFlag">负载标识</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, long balanceFlag, 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), balanceFlag, 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), balanceFlag, 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), balanceFlag, 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);
}
