fixedwaitthread.java

Java示例100

/**
 * This class is used by CCache4.java, CCache5.java, and CCache6.java,
 * and CCache7.java
 **/

import java.sql.*;
import javax.sql.*;
import oracle.jdbc.*;
import oracle.jdbc.pool.*;


/**
 * Getting connections through various threads
 */
class FixedWaitThread extends Thread
{
  Connection conn = null;  // a logical connection to be obtained in this thread
  OracleConnectionCacheImpl ods = null;
  static boolean greenLight = false;  // a signal to control the thread
  int threadid = 0;                   // unique to each thread
  static int threadnum = 0;           // record how many threads created
  static int connum = 0;      // record how many connections made
                              // throught FixedWaitThread
  boolean connected = false;  // indicate whether this thread connection
                              // creation success


  public FixedWaitThread ()
  {  }


  public FixedWaitThread (OracleConnectionCacheImpl o, int i)
  {
      incrthreadnum();
      threadid = i;
      ods = o;
  }


  synchronized static void incrthreadnum ()
  {
      ++threadnum;
  }
  synchronized static int getthreadnum ()
  {
      return threadnum;
  }
  synchronized static void incrconnum ()
  {
      ++connum;
  }
  synchronized static void decrconnum ()
  {
      --connum;
  }
  synchronized static int getconnum ()
  {
      return connum;
  }
  boolean getconnected ()
  {
      return connected;
  }
  void closeconnection ()
  {
      if ( getconnected() )
      {
          connected = false;
          decrconnum ();
          try { conn.close(); } catch (SQLException e)
          { e.printStackTrace(); } 
          conn = null;
      }
  }

  synchronized static void setGreenLight ()
  {
     greenLight = true;
  }

  boolean getGreenLight ()
  {
      return greenLight;
  }


  public void run ()
  {
      while (!getGreenLight())
        yield();

      try
      {
          conn = ods.getConnection();
      } catch (SQLException e)
      {
          // ORA-17126=Fixed Wait timeout elapsed,
          // an expected exception
          if ( e.getErrorCode()  != 17126 ) 
              e.printStackTrace();
      }

      long t = System.currentTimeMillis();

      if ( conn != null )
      {
          connected = true;
          incrconnum ();
          System.out.println("Thread " + threadid + " get connection at " +
                             (new Timestamp (t)).toString());
      }
      else
          System.out.println("Thread " + threadid + " get connection Failed");
  } // end of run ()
} // end of class FixedWaitThread