/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.smartdata.hdfs;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.balancer.TestBalancer;
import org.junit.After;
import org.junit.Before;
import org.smartdata.SmartContext;
import org.smartdata.conf.SmartConf;
import org.smartdata.conf.SmartConfKeys;

import java.io.IOException;

/**
 * A MiniCluster for action test.
 */
public abstract class MiniClusterHarness {
  public static int DEFAULT_BLOCK_SIZE = 50;
  protected MiniDFSCluster cluster;
  protected DistributedFileSystem dfs;
  protected DFSClient dfsClient;
  protected SmartContext smartContext;

  static {
    TestBalancer.initTestSetup();
  }

  @Before
  public void init() throws Exception {
    SmartConf conf = new SmartConf();
    initConf(conf);
    cluster = createCluster(conf);
    // Add namenode URL to smartContext
    conf.set(SmartConfKeys.SMART_DFS_NAMENODE_RPCSERVER_KEY,
        "hdfs://" + cluster.getNameNode().getNameNodeAddressHostPortString());
    cluster.waitActive();
    dfs = cluster.getFileSystem();
    dfsClient = dfs.getClient();
    smartContext = new SmartContext(conf);
  }

  static void initConf(Configuration conf) {
    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, DEFAULT_BLOCK_SIZE);
    conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, DEFAULT_BLOCK_SIZE);
    conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1L);
    conf.setLong(DFSConfigKeys.DFS_BALANCER_MOVEDWINWIDTH_KEY, 2000L);
  }

  public MiniDFSCluster createCluster(Configuration conf)
      throws IOException, IllegalAccessException, ClassNotFoundException, InstantiationException {
    return MiniClusterFactory.get().create(5, conf);
  }

  @After
  public void shutdown() throws IOException {
    if (cluster != null) {
      cluster.shutdown();
    }
  }
}
