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There is a newer version: 0.9.5.5_1

package com.mchange.v2.c3p0;

import java.sql.Connection;

/**
 *  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
 *  
 *  
 *    Extend {@link com.mchange.v2.c3p0.AbstractConnectionTester}
 *    
 *        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)
 *        
 *    
 *    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. 
 */
public interface UnifiedConnectionTester extends FullQueryConnectionTester
{
    public final static int CONNECTION_IS_OKAY       = ConnectionTester.CONNECTION_IS_OKAY;
    public final static int CONNECTION_IS_INVALID    = ConnectionTester.CONNECTION_IS_INVALID;
    public final static int DATABASE_IS_INVALID      = ConnectionTester.DATABASE_IS_INVALID;
    
    public int activeCheckConnection(Connection c);
    public int activeCheckConnection(Connection c, Throwable[] rootCauseOutParamHolder);
    public int activeCheckConnection(Connection c, String preferredTestQuery);
    public int activeCheckConnection(Connection c, String preferredTestQuery, Throwable[] rootCauseOutParamHolder);

    public int statusOnException(Connection c, Throwable t);
    public int statusOnException(Connection c, Throwable t, Throwable[] rootCauseOutParamHolder);
    public int statusOnException(Connection c, Throwable t, String preferredTestQuery);
    public int statusOnException(Connection c, Throwable t, String preferredTestQuery, Throwable[] rootCauseOutParamHolder);

    public boolean equals(Object o);
    public int hashCode();
}