/// <summary>
/// 配置 REDIS 集群
/// </summary>
/// <param name="nodes">集群节点</param>
/// <param name="config"><see cref="RedisClientManagerConfig"/> 客户端缓冲池配置</param>
/// <returns></returns>
public static RedisCluster Configure(IEnumerable <ClusterNode> nodes, RedisClientManagerConfig config)
{
if (nodes == null)
{
throw new ArgumentNullException("nodes");
}
if (nodes == null || nodes.Count() == 0)
{
throw new ArgumentException("There is no nodes to configure cluster.");
}
if (_cluster == null)
{
lock (_factory)
{
if (_cluster == null)
{
RedisCluster c = new RedisCluster(nodes, config);
_cluster = c;
}
}
}
return(_cluster);
}
// 初始化集群管理
void Initialize(IList <InternalClusterNode> clusterNodes = null)
{
// 从 redis 读取集群信息
IList <InternalClusterNode> nodes = clusterNodes == null?RedisCluster.ReadClusterNodes(_source) : clusterNodes;
// 生成主节点，每个主节点的 slot 对应一个REDIS客户端缓冲池管理器
IList <InternalClusterNode> masters = null;
IDictionary <int, PooledRedisClientManager> managers = null;
foreach (var n in nodes)
{
// 节点无效或者
if (!(n.IsMater &&
!string.IsNullOrEmpty(n.Host) &&
string.IsNullOrEmpty(n.NodeFlag) &&
(string.IsNullOrEmpty(n.LinkState) || n.LinkState == InternalClusterNode.CONNECTED)))
{
continue;
}
n.SlaveNodes = nodes.Where(x => x.MasterNodeId == n.NodeId);
if (masters == null)
{
masters = new List <InternalClusterNode>();
}
masters.Add(n);
// 用每一个主节点的哈希槽做键，导入REDIS客户端缓冲池管理器
// 然后，方法表指针（又名类型对象指针）上场，占据 4 个字节。 4 * 16384 / 1024 = 64KB
if (managers == null)
{
managers = new Dictionary <int, PooledRedisClientManager>();
}
string[] writeHosts = new[] { n.HostString };
string[] readHosts = n.SlaveNodes.Where(n => false).Select(n => n.HostString).ToArray();
var pool = new PooledRedisClientManager(writeHosts, readHosts, _config);
managers.Add(n.Slot.Start, pool);
if (n.Slot.End != null)
{
// 这个范围内的哈希槽都用同一个缓冲池
for (int s = n.Slot.Start + 1; s <= n.Slot.End.Value; s++)
{
managers.Add(s, pool);
}
}
if (n.RestSlots != null)
{
foreach (var slot in n.RestSlots)
{
managers.Add(slot.Start, pool);
if (slot.End != null)
{
// 这个范围内的哈希槽都用同一个缓冲池
for (int s = slot.Start + 1; s <= slot.End.Value; s++)
{
managers.Add(s, pool);
}
}
}
}
}
_masters = masters;
_redisClientManagers = managers;
_clusterNodes = nodes != null ? nodes : null;
if (_masters == null)
{
_masters = new List <InternalClusterNode>(0);
}
if (_clusterNodes == null)
{
_clusterNodes = new List <InternalClusterNode>(0);
}
if (_redisClientManagers == null)
{
_redisClientManagers = new Dictionary <int, PooledRedisClientManager>(0);
}
if (_masters.Count > 0)
{
_source = _masters.Select(n => new ClusterNode(n.Host, n.Port, n.Password)).ToList();
}
}
// 重新刷新集群信息
private bool DiscoveryNodes(IEnumerable <ClusterNode> source, RedisClientManagerConfig config)
{
bool lockTaken = false;
try
{
// noop
if (_isDiscoverying)
{
}
Monitor.Enter(_objLock, ref lockTaken);
_source = source;
_config = config;
_isDiscoverying = true;
// 跟上次同步时间相隔 {MONITORINTERVAL} 秒钟以上才需要同步
if ((DateTime.Now - _lastDiscoveryTime).TotalMilliseconds >= MONITORINTERVAL)
{
bool isRefresh = false;
IList <InternalClusterNode> newNodes = RedisCluster.ReadClusterNodes(_source);
foreach (var node in newNodes)
{
var n = _clusterNodes.FirstOrDefault(x => x.HostString == node.HostString);
isRefresh =
n == null || // 新节点
n.Password != node.Password || // 密码变了
n.IsMater != node.IsMater || // 主变从或者从变主
n.IsSlave != node.IsSlave || // 主变从或者从变主
n.NodeFlag != node.NodeFlag || // 节点标记位变了
n.LinkState != node.LinkState || // 节点状态位变了
n.Slot.Start != node.Slot.Start || // 哈希槽变了
n.Slot.End != node.Slot.End || // 哈希槽变了
(n.RestSlots == null && node.RestSlots != null) ||
(n.RestSlots != null && node.RestSlots == null);
if (!isRefresh && n.RestSlots != null && node.RestSlots != null)
{
var slots1 = n.RestSlots.OrderBy(x => x.Start).ToList();
var slots2 = node.RestSlots.OrderBy(x => x.Start).ToList();
for (int index = 0; index < slots1.Count; index++)
{
isRefresh =
slots1[index].Start != slots2[index].Start || // 哈希槽变了
slots1[index].End != slots2[index].End; // 哈希槽变了
if (isRefresh)
{
break;
}
}
}
if (isRefresh)
{
break;
}
}
if (isRefresh)
{
// 重新初始化集群
this.Dispose();
this.Initialize(newNodes);
this._lastDiscoveryTime = DateTime.Now;
}
}
// 最后刷新时间在 {MONITORINTERVAL} 内，表示是最新群集信息 newest
return((DateTime.Now - _lastDiscoveryTime).TotalMilliseconds < MONITORINTERVAL);
}
finally
{
if (lockTaken)
{
_isDiscoverying = false;
Monitor.Exit(_objLock);
}
}
}