/**
 * Copyright 2007 The Apache Software Foundation
 *
 * 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 org.apache.hadoop.hbase;

import java.io.IOException;
import java.util.TreeMap;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.SequenceFile.Reader;

/** JUnit test case for HLog */
public class TestHLog extends HBaseTestCase implements HConstants {

  @Override
  public void setUp() throws Exception {
    super.setUp();
  }
  
  /** The test */
  public void testAppend() {
    try {
      Path dir = getUnitTestdir(getName());
      FileSystem fs = FileSystem.get(this.conf);
      if (fs.exists(dir)) {
        fs.delete(dir);
      }
      final int COL_COUNT = 10;
      final Text regionName = new Text("regionname");
      final Text tableName = new Text("tablename");
      final Text row = new Text("row");
      Reader reader = null;
      HLog log = new HLog(fs, dir, this.conf);
      try {
        // Write columns named 1, 2, 3, etc. and then values of single byte
        // 1, 2, 3...
        TreeMap<Text, BytesWritable> cols = new TreeMap<Text, BytesWritable>();
        for (int i = 0; i < COL_COUNT; i++) {
          cols.put(new Text(Integer.toString(i)),
              new BytesWritable(new byte[] { (byte)(i + '0') }));
        }
        long timestamp = System.currentTimeMillis();
        log.append(regionName, tableName, row, cols, timestamp);
        long logSeqId = log.startCacheFlush();
        log.completeCacheFlush(regionName, tableName, logSeqId);
        log.close();
        Path filename = log.computeFilename(log.filenum - 1);
        log = null;
        // Now open a reader on the log and assert append worked.
        reader = new SequenceFile.Reader(fs, filename, conf);
        HLogKey key = new HLogKey();
        HLogEdit val = new HLogEdit();
        for (int i = 0; i < COL_COUNT; i++) {
          reader.next(key, val);
          assertEquals(regionName, key.getRegionName());
          assertEquals(tableName, key.getTablename());
          assertEquals(row, key.getRow());
          assertEquals((byte)(i + '0'), val.getVal().get()[0]);
          System.out.println(key + " " + val);
        }
        while (reader.next(key, val)) {
          // Assert only one more row... the meta flushed row.
          assertEquals(regionName, key.getRegionName());
          assertEquals(tableName, key.getTablename());
          assertEquals(HLog.METAROW, key.getRow());
          assertEquals(HLog.METACOLUMN, val.getColumn());
          assertEquals(0, val.getVal().compareTo(COMPLETE_CACHEFLUSH));
          System.out.println(key + " " + val);
        }
      } finally {
        if (log != null) {
          log.close();
        }
        if (reader != null) {
          reader.close();
        }
        if (fs.exists(dir)) {
          fs.delete(dir);
        }
      }
    } catch(IOException e) {
      e.printStackTrace();
      fail();
    }
  }

  @Override
  public void tearDown() throws Exception {
    super.tearDown();
  }
}