// Copyright 2012 Cloudera Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.cloudera.impala.catalog;

import com.cloudera.impala.thrift.TCatalogObjectType;
import com.cloudera.impala.thrift.THdfsCachePool;
import com.google.common.base.Preconditions;

/**
 * Represents an HDFS cache pool (CachePoolInfo class). Currently, the only metadata we
 * care about for cache pools is the cache pool name. In the future it may be desirable
 * to track additional metadata such as the owner, size, and current usage of the pool.
 */
public class HdfsCachePool implements CatalogObject {
  private long catalogVersion_;
  private final THdfsCachePool cachePool_;

  public HdfsCachePool(THdfsCachePool cachePool) {
    Preconditions.checkNotNull(cachePool);
    cachePool_ = cachePool;
  }

  @Override
  public TCatalogObjectType getCatalogObjectType() {
    return TCatalogObjectType.HDFS_CACHE_POOL;
  }

  public THdfsCachePool toThrift() {
    return cachePool_;
  }

  public static HdfsCachePool fromThrift(THdfsCachePool cachePool) {
    return new HdfsCachePool(cachePool);
  }

  @Override
  public String getName() { return cachePool_.getPool_name(); }
  @Override
  public long getCatalogVersion() { return catalogVersion_; }
  @Override
  public void setCatalogVersion(long newVersion) { catalogVersion_ = newVersion; }
  @Override
  public boolean isLoaded() { return true; }
}