SsTable.java

/*
 * Copyright 2015 Edward Capriolo
 *
 * 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 io.teknek.nibiru.engine;

import io.teknek.nibiru.Store;
import io.teknek.nibiru.Configuration;
import io.teknek.nibiru.Token;
import io.teknek.nibiru.engine.atom.AtomKey;
import io.teknek.nibiru.engine.atom.AtomValue;

import java.io.IOException;
import java.util.SortedMap;
import java.util.concurrent.atomic.AtomicLong;

public class SsTable implements Comparable<SsTable> {

  private KeyCache keyCache;
  private static AtomicLong ID = new AtomicLong();
  private long myId; 
  private Store columnFamily;
  private SsTableReader ssTableReader;
  private BloomFilter bloomFilterReader;
  
  public SsTable(Store columnFamily){
    this.columnFamily = columnFamily;
    myId = ID.getAndIncrement();
  }
  
  public void open(String id, Configuration conf) throws IOException {    
    bloomFilterReader = new BloomFilter();
    bloomFilterReader.open(id, conf);
    keyCache = new KeyCache(columnFamily.getStoreMetadata().getKeyCachePerSsTable());
    ssTableReader = new SsTableReader(this, keyCache, bloomFilterReader);
    ssTableReader.open(id);
  }
  
  public void close() throws IOException {
    ssTableReader.close();
  }
  public SsTableStreamReader getStreamReader() throws IOException {
    return ssTableReader.getStreamReader();
  }
  
  /*
   * If row and column exist return Val
   * if row is tombstoned return row tombstone
   * If column is tombstoned return column tombstone
   * In other words always return known data
   */
  public AtomValue get(Token row, String column) throws IOException{
    return ssTableReader.get(row, column);
  }

  public SortedMap<AtomKey, AtomValue> slice(Token row, String start, String end) throws IOException {
    return ssTableReader.slice(row, start, end);
  }
  
  @Override
  public int compareTo(SsTable o) {
    if (o == this){
      return 0;
    }
    if (this.myId == o.myId){
      return 0;
    } else if (this.myId < o.myId){
      return -1;
    } else {
      return 1;
    }
  }

  public Store getColumnFamily() {
    return columnFamily;
  }
  
}