Class ValidatingConnectionPool

All Implemented Interfaces:
Closeable, AutoCloseable, ConnectionPool, Container, Destroyable, Dumpable, Dumpable.DumpableContainer, LifeCycle, Sweeper.Sweepable

public class ValidatingConnectionPool extends DuplexConnectionPool

A connection pool that validates connections before making them available for use.

Connections that have just been opened are not validated. Connections that are released will be validated.

Validation by reading from the EndPoint is not reliable, since the TCP FIN may arrive just after the validation read.

This class validates connections by putting them in a "quarantine" for a configurable timeout, where they cannot be used to send requests. When the timeout expires, the quarantined connection is made idle and therefore available to send requests.

The existing HttpClient mechanism to detect server closes will trigger and close quarantined connections, before they are made idle (and reusable) again.

There still is a small chance that the timeout expires, the connection is made idle and available again, it is used to send a request exactly when the server decides to close. This case is however unavoidable and may be mitigated by tuning the idle timeout of the servers to be larger than that of the client.

  • Constructor Details

    • ValidatingConnectionPool

      public ValidatingConnectionPool(HttpDestination destination, int maxConnections, Callback requester, Scheduler scheduler, long timeout)
  • Method Details