/*************************************************************************
 * Copyright 2009-2012 Eucalyptus Systems, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
 * CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
 * additional information or have any questions.
 *
 * This file may incorporate work covered under the following copyright
 * and permission notice:
 *
 *   Software License Agreement (BSD License)
 *
 *   Copyright (c) 2008, Regents of the University of California
 *   All rights reserved.
 *
 *   Redistribution and use of this software in source and binary forms,
 *   with or without modification, are permitted provided that the
 *   following conditions are met:
 *
 *     Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *     Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer
 *     in the documentation and/or other materials provided with the
 *     distribution.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 *   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 *   CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 *   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *   POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
 *   THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL,
 *   COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
 *   AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
 *   IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA,
 *   SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY,
 *   WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
 *   REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO
 *   IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT
 *   NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
 ************************************************************************/

package com.eucalyptus.walrus.entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.PersistenceContext;
import javax.persistence.Table;

import org.apache.log4j.Logger;
import com.eucalyptus.configurable.ConfigurableClass;
import com.eucalyptus.configurable.ConfigurableField;
import com.eucalyptus.entities.AbstractPersistent;
import com.eucalyptus.entities.Transactions;
import com.eucalyptus.walrus.util.WalrusProperties;

@Entity
@PersistenceContext(name = "eucalyptus_walrus")
@Table(name = "drbd_info")
@ConfigurableClass(root = "walrusbackend", alias = "drbd", description = "DRBD configuration.", deferred = true)
public class DRBDInfo extends AbstractPersistent {
  private static Logger LOG = Logger.getLogger(DRBDInfo.class);

  @Column(name = "walrus_name", unique = true)
  private String name;
  @ConfigurableField(description = "DRBD block device", displayName = "Block Device")
  @Column(name = "block_device")
  private String blockDevice;
  @ConfigurableField(description = "DRBD resource name", displayName = "DRBD Resource")
  @Column(name = "resource_name")
  private String resource;

  public DRBDInfo() {}

  public DRBDInfo(final String name, final String blockDevice) {
    this.name = name;
    this.blockDevice = blockDevice;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getBlockDevice() {
    return blockDevice;
  }

  public void setBlockDevice(String blockDevice) {
    this.blockDevice = blockDevice;
  }

  public String getResource() {
    return resource;
  }

  public void setResource(String resource) {
    this.resource = resource;
  }

  public static DRBDInfo getDRBDInfo() {
    DRBDInfo drbdInfo = null;

    try {
      drbdInfo = Transactions.find(new DRBDInfo());
    } catch (Exception e) {
      LOG.warn("DRBD information not found. Loading defaults.");
      try {
        drbdInfo = Transactions.saveDirect(new DRBDInfo(WalrusProperties.NAME, "/dev/unknown"));
      } catch (Exception e1) {
        try {
          drbdInfo = Transactions.find(new DRBDInfo());
        } catch (Exception e2) {
          LOG.warn("Failed to persist and retrieve DRBDInfo entity");
        }
      }
    }

    if (drbdInfo == null) {
      drbdInfo = new DRBDInfo(WalrusProperties.NAME, "/dev/unknown");
    }

    return drbdInfo;
  }
}