Implementing the Object pool pattern

The Object pool is a pattern used for caching objects and avoiding expensive re-creations. This pattern is frequently used for objects representing the connection to a database shared among multiple clients. For instance this pattern has been used for implementing java JDBC drivers[1].  

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[1]http://docs.oracle.com/cd/E13222_01/wls/docs81/ConsoleHelp/jdbc_connection_pools.html