Examples of com.mchange.v2.c3p0.UnifiedConnectionTester

com.mchange.v2.c3p0.DriverManagerDataSource
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 {@link com.mchange.v2.c3p0.AbstractConnectionTester}
2. Override only the two abstract methods
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.

        toInt(ps.getProperty("maxPoolSize")), toInt(ps.getProperty("minPoolSize")), toInt(ps.getProperty("initialPoolSize")),
        toInt(ps.getProperty("maxIdleTime")),toInt(ps.getProperty("acquireIncrement")));
  }
  
  public boolean start() {
    dataSource = new ComboPooledDataSource();
    dataSource.setJdbcUrl(jdbcUrl);
    dataSource.setUser(user);
    dataSource.setPassword(password);
    try {dataSource.setDriverClass(driverClass);}
    catch (PropertyVetoException e) {dataSource = null; System.err.println("C3p0Plugin start error"); throw new RuntimeException(e);}

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   }


   private static ComboPooledDataSource staticDS = null;
   private static synchronized DataSource getDataSource(String url) {
     if (staticDS == null) {
        staticDS = new ComboPooledDataSource();
        try {
           Class.forName(DB_DRIVER_CLASS).newInstance();
           staticDS.setDriverClass(DB_DRIVER_CLASS);
        } catch (Exception e) {
           throw new RuntimeException("Error loading database driver: "+e.getMessage());

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    this.credentials = credentials;
  }


  @Override
  public final ComboPooledDataSource get() {
    ComboPooledDataSource dataSource = new ComboPooledDataSource();


    try {


      dataSource.setDriverClass(credentials.getDriverClass());
      dataSource.setJdbcUrl(credentials.getUrl());
      dataSource.setUser(credentials.getUser());
      dataSource.setPassword(credentials.getPassword());


      configureDataSource(dataSource);


    } catch (PropertyVetoException e) {

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      {
        Config.DATABASE_MAX_CONNECTIONS = 2;
        _log.warning("A minimum of " + Config.DATABASE_MAX_CONNECTIONS + " db connections are required.");
      }
      
      _source = new ComboPooledDataSource();
      _source.setAutoCommitOnClose(true);
      
      _source.setInitialPoolSize(10);
      _source.setMinPoolSize(10);
      _source.setMaxPoolSize(Math.max(10, Config.DATABASE_MAX_CONNECTIONS));

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            String username = p.getProperty(KEY_DB_CONNECTION_USERNAME);
            String password = p.getProperty(KEY_DB_CONNECTION_PASSWORD);


            System.setProperty("com.mchange.v2.c3p0.management.ManagementCoordinator", "com.mchange.v2.c3p0.management.NullManagementCoordinator");


            ComboPooledDataSource cpds = new ComboPooledDataSource(connectionName);
      cpds.setDriverClass(driver);
            cpds.setJdbcUrl(url);
      cpds.setUser(username);
      cpds.setPassword(password);
      
      cpds.setAutoCommitOnClose(autoCommit);
      
      cpds.setMaxPoolSize(Integer.parseInt(maxPoolSize));
      cpds.setMinPoolSize(Integer.parseInt(minPoolSize));
      cpds.setAcquireIncrement(Integer.parseInt(acquireIncrement));
      cpds.setInitialPoolSize(Integer.parseInt(initialPoolSize));
      cpds.setMaxIdleTime(Integer.parseInt(maxIdleTime));


            connectionPoolDataSourcesMap.put(connectionName, cpds);
            log.debug("created ds for " + connectionName + " with properties: " + c3p0props);
    } catch (Throwable e) {
      log.error("Failed to create data source for " + connectionName + " with properties: " + c3p0props + ": " + e.getMessage());

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   private ComboPooledDataSource pooledDataSource;


   @Override
   public void start(ConnectionFactoryConfig config, ClassLoader classLoader) throws CacheLoaderException {
      logFileOverride(classLoader);
      pooledDataSource = new ComboPooledDataSource();
      pooledDataSource.setProperties(new Properties());
      try {
         /* Since c3p0 does not throw an exception when it fails to load a driver we attempt to do so here
          * Also, c3p0 does not allow specifying a custom classloader, so use c3p0's
          */

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//                     0,
//                     100 );


    //ds_unpooled = DataSources.unpooledDataSource(jdbc_url, username, password);
    //ds_pooled = DataSources.pooledDataSource( ds_unpooled );
      ds_unpooled = new DriverManagerDataSource();


       //DataSource ds_unpooled_screwy = C3P0TestUtils.unreliableCommitDataSource( ds_unpooled );
       //ds_pooled = DataSources.pooledDataSource( ds_unpooled_screwy );


//     PoolConfig pc = new PoolConfig();

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      usage();
  */
  
  try
      {
    DriverManagerDataSource dmds = new DriverManagerDataSource();
    //dmds.setJdbcUrl( jdbcUrl );
    //dmds.setUser( username );
    //dmds.setPassword( password );
    try { drop( dmds ); }
    catch (Exception e)

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      usage();
  
  
  try
      {
    DriverManagerDataSource dmds = new DriverManagerDataSource();
    dmds.setJdbcUrl( jdbcUrl );
    dmds.setUser( username );
    dmds.setPassword( password );
    try { drop( dmds ); }
    catch (Exception e)
        { /* Ignore */ }
    create( dmds );

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      usage();
  */
  
  try
      {
    DriverManagerDataSource dmds = new DriverManagerDataSource();
    //dmds.setJdbcUrl( jdbcUrl );
    //dmds.setUser( username );
    //dmds.setPassword( password );
    try { drop( dmds ); }
    catch (Exception e)

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