cassandra java driver

java driver version: com.datastax.cassandra:cassandra-driver-core:3.1.2

 

概念

cassandra driver 与 cassandra cluster server 通过TCP协议进行异步通信。

首先，driver与cassandra建立连接创建Cluster对象，它代表这个cassandra集群，通过Cluster对象可以拿到一些元数据信息，例如keyspace，table，host等。其次，由Cluster对象创建Session对象，通过它就可以进行sql操作了。

 

Mapper objects are thread-safe. The manager caches them internally, so calling manager#mapper more than once for the same class will return the previously generated mapper.

The MappingManager can then process this interface and automatically generate an implementation for it:

Like mappers, accessors are cached at the manager level and thus, are thread-safe/sharable.