/*
 * ToroDB
 * Copyright © 2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.torodb.backend.rid;

import java.util.concurrent.atomic.AtomicInteger;

import javax.annotation.concurrent.ThreadSafe;

@ThreadSafe
public class ReservedIdInfo {

  private final AtomicInteger lastUsedId;
  private final AtomicInteger lastCachedId;

  public ReservedIdInfo(int lastUsedId, int lastCachedId) {
    this.lastUsedId = new AtomicInteger(lastUsedId);
    this.lastCachedId = new AtomicInteger(lastCachedId);
  }

  public void setLastUsedId(int lastUsedId) {
    this.lastUsedId.set(lastUsedId);
  }

  public int getLastUsedId() {
    return lastUsedId.get();
  }

  public int getAndAddLastUsedId(int increment) {
    return lastUsedId.getAndAdd(increment);
  }

  public void setLastCachedId(int lastCachedId) {
    this.lastCachedId.set(lastCachedId);
  }

  public int getLastCachedId() {
    return lastCachedId.get();
  }

  public int getAndAddLastCachedId(int increment) {
    return lastCachedId.getAndAdd(increment);
  }

  @Override
  public int hashCode() {
    return super.hashCode();
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    final ReservedIdInfo other = (ReservedIdInfo) obj;
    if (this.lastUsedId != other.lastUsedId && (this.lastUsedId == null || !this.lastUsedId.equals(
        other.lastUsedId))) {
      return false;
    }
    if (this.lastCachedId != other.lastCachedId && (this.lastCachedId == null || !this.lastCachedId
        .equals(other.lastCachedId))) {
      return false;
    }
    return true;
  }

}