Class AbstractConnectionTester

  • All Implemented Interfaces:
    ConnectionTester, FullQueryConnectionTester, QueryConnectionTester, UnifiedConnectionTester, java.io.Serializable
    Direct Known Subclasses:
    DefaultConnectionTester, IsValidOnlyConnectionTester

    public abstract class AbstractConnectionTester
    extends java.lang.Object
    implements UnifiedConnectionTester

    Having expanded the once-simple ConnectionTester interface to support both user-specified queries and return of root cause Exceptions (via an out-param), this interface has grown unnecessarily complex.

    If you wish to implement a custom Connection tester, here is the simple way to do it

    1. Extend AbstractConnectionTester
    2. Override only the two abstract methods
      • public int activeCheckConnection(Connection c, String preferredTestQuery, Throwable[] rootCauseOutParamHolder)
      • public int statusOnException(Connection c, Throwable t, String preferredTestQuery, Throwable[] rootCauseOutParamHolder)
    3. Take care to ensure that your methods are defined to allow preferredTestQuery and rootCauseOutParamHolder to be null.

    Parameter rootCauseOutParamHolder is an optional parameter, which if supplied, will be a Throwable array whose size it at least one. If a Connection test fails because of some Exception, the Connection tester may set this Exception as the zero-th element of the array to provide information about why and how the test failed.

    See Also:
    Serialized Form