Example: Using AS400ConnectionPool

//////////////////////////////////////////////////////////////////////////////////
//
// AS400ConnectionPooling example.  This program uses an AS400ConnectionPool to 
// create connections to an iSeries server.
// Command syntax:
//    AS400ConnectionPooling system myUserId myPassword
//
// For example,
//    AS400ConnectionPooling MySystem MyUserId MyPassword
//
//////////////////////////////////////////////////////////////////////////////////

import com.ibm.as400.access.*;

public class AS400ConnectionPooling 
{
   public static void main (String[] parameters)
   {
      // Check the input parameters.
      if (parameters.length != 3)
      {
         System.out.println("");
         System.out.println("Usage:");
         System.out.println("");
         System.out.println("   AS400ConnectionPooling system userId password");
         System.out.println("");
         System.out.println("");
         System.out.println("For example:");
         System.out.println("");
         System.out.println("");
         System.out.println("   AS400ConnectionPooling MySystem MyUserId MyPassword");
         System.out.println("");
         return;
      }

      String system   = parameters[0];
      String userId   = parameters[1];
      String password = parameters[2];

      try
      {
         // Create an AS400ConnectionPool.
         AS400ConnectionPool testPool = new AS400ConnectionPool();

         // Set a maximum of 128 connections to this pool.
         testPool.setMaxConnections(128);

         // Set a maximum lifetime for 30 minutes for connections.
         testPool.setMaxLifetime(1000*60*30);     // 30 min  Max lifetime since created.

         // Preconnect 5 connections to the AS400.COMMAND service.
         testPool.fill(system, userId, password, AS400.COMMAND, 1);
         System.out.println();
         System.out.println("Preconnected 1 connection to the AS400.COMMAND service");

         // Call getActiveConnectionCount and getAvailableConnectionCount to see how many
         // connections are in use and available for a particular system.
         System.out.println("Number of active connections: " 
                             + testPool.getActiveConnectionCount(system, userId));
         System.out.println("Number of available connections for use: "
                             + testPool.getAvailableConnectionCount(system, userId));
 
         // Create a connection to the AS400.COMMAND service. (Use the service number
         // constants defined in the AS400 class (FILE, PRINT, COMMAND, DATAQUEUE, and so on.))
         // Since connections have already been filled, the usual time spent connecting
         // to the command service is avoided.
         AS400 newConn1 = testPool.getConnection(system, userId, password, AS400.COMMAND);
         
         System.out.println();
         System.out.println("getConnection gives out an existing connection to user");
         System.out.println("Number of active connections: "
                             + testPool.getActiveConnectionCount(system, userId));
         System.out.println("Number of available connections for use:  " 
                             + testPool.getAvailableConnectionCount(system, userId));
 
         // Create a new command call object and run a command.
         CommandCall cmd1 = new CommandCall(newConn1); 
         cmd1.run("CRTLIB FRED");

         // Return the connection to the pool.
         testPool.returnConnectionToPool(newConn1);
         
         System.out.println();
         System.out.println("Returned a connection to pool");
         System.out.println("Number of active connections: "
                             + testPool.getActiveConnectionCount(system, userId));
         System.out.println("Number of available connections for reuse: "
                             + testPool.getAvailableConnectionCount(system, userId));
 
         // Create a connection to the AS400.COMMAND service.  This will return the same
         // object as above for reuse.
         AS400 newConn2 = testPool.getConnection(system, userId, password, AS400.COMMAND);
         
         System.out.println();
         System.out.println("getConnection gives out an existing connection to user");
         System.out.println("Number of active connections: "
                             + testPool.getActiveConnectionCount(system, userId));
         System.out.println("Number of available connections for reuse: "
                             + testPool.getAvailableConnectionCount(system, userId));
 
         // Create a connection to the AS400.COMMAND service.  This will create a new 
         // connection as there are not any connections in the pool to reuse.
         AS400 newConn3 = testPool.getConnection(system, userId, password, AS400.COMMAND);

         System.out.println();
         System.out.println("getConnection creates a new connection because there are no
                             connections available");
         System.out.println("Number of active connections: "
                             + testPool.getActiveConnectionCount(system, userId));
         System.out.println("Number of available connections for reuse: "
                             + testPool.getAvailableConnectionCount(system, userId));

         // Close the test pool.
         testPool.close();
      }
      catch (Exception e)
      {
         // If any of the above operations failed say the pool operations failed
         // and output the exception.

         System.out.println("Pool operations failed");
         System.out.println(e);
         e.printStackTrace();
      }
   }
}