src/org/objectweb/cjdbc/controller/loadbalancer/tasks/RollbackTask.java

説明を見る。

package org.objectweb.cjdbc.controller.loadbalancer.tasks;

import java.sql.Connection;
import java.sql.SQLException;

import org.objectweb.cjdbc.controller.backend.DatabaseBackend;
import org.objectweb.cjdbc.controller.connection.AbstractConnectionManager;
import org.objectweb.cjdbc.controller.loadbalancer.BackendWorkerThread;

public class RollbackTask extends AbstractTask
{
  private String login;

  private long   transactionId;

  private long   timeout;

  public RollbackTask(int nbToComplete, int totalNb, long timeout,
      String login, long transactionId)
  {
    super(nbToComplete, totalNb);
    this.login = login;
    this.transactionId = transactionId;
    this.timeout = timeout;
  }

  public void execute(BackendWorkerThread backendThread) throws SQLException
  {
    DatabaseBackend db = backendThread.getBackend();
    Long lTid = new Long(transactionId);

    AbstractConnectionManager cm = db.getConnectionManager(login);
    if (cm == null)
    {
      SQLException se = new SQLException(
          "No Connection Manager for Virtual Login:" + login);
      try
      {
        notifyFailure(backendThread, 1, se);
      }
      catch (SQLException ignore)
      {

      }
      throw se;
    }

    Connection c = cm.retrieveConnection(transactionId);

    // Sanity check
    if (c == null)
    { // Bad connection
      db.stopTransaction(lTid);
      SQLException se = new SQLException(
          "Unable to retrieve connection for transaction " + transactionId);
      try
      { // All backends failed, just ignore
        if (!notifyFailure(backendThread, timeout, se))
          return;
      }
      catch (SQLException ignore)
      {
      }
      // Disable this backend (it is no more in sync) by killing the backend
      // thread
      backendThread.kill();
      String msg = "Failed to rollback transaction " + transactionId
          + " on backend " + db.getName() + " but " + getSuccess()
          + " succeeded (" + se + ")";
      backendThread.getLogger().error(msg);
      throw new SQLException(msg);
    }

    // Execute Query
    try
    {
      c.rollback();
      c.setAutoCommit(true);
    }
    catch (Exception e)
    {
      try
      {
        if (!notifyFailure(backendThread, timeout, new SQLException(e
            .getMessage())))
          return;
      }
      catch (SQLException ignore)
      {
      }
      // Disable this backend (it is no more in sync) by killing the backend
      // thread
      backendThread.kill();
      String msg = "Failed to rollback transaction " + transactionId
          + " on backend " + db.getName() + " but " + getSuccess()
          + " succeeded (" + e + ")";
      backendThread.getLogger().error(msg);
      throw new SQLException(msg);
    }
    finally
    {
      cm.releaseConnection(transactionId);
      db.stopTransaction(lTid);
    }
    notifySuccess();
  }

  public String toString()
  {
    return "RollbackTask (" + transactionId + ")";
  }
}

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