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Build # 352

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push

travis-ci

Committed by nicktorwald

Commit Message

Support auto refresh a list of cluster nodes

Refactor SocketChannelProvider implementations. Now we have two
SingleSocketChannelProviderImpl and RoundRobinSocketProviderImpl used by
simple and cluster clients respectively. To achieve this a
BaseSocketChannelProvider was extracted.

Add a service discovery implementation based on a Tarantool stored
procedure which is called to obtain a new list of cluster nodes.

Integrate service discovery and current cluster client. The client now
is aware of potential nodes changing using a configurable background job
which periodically checks whether node addresses have changed. If so
the client refreshes the RoundRobinSocketProviderImpl and replaces old
nodes by new ones. It also requires some additional effort in case of
missing the current node in the list. We need to reconnect to another
node as soon as possible with a minimal delay between client requests.
To achieve this we currently try to catch a moment when the requests in
progress have been accomplished and we can finish reconnection process.

Closes: #34
See also: #142

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