code: public void store(Long simhash) {
  		final int fracCount = this.fracCount;
  		final List<Map<String, List<Long>>> storage = this.storage;
  		final List<String> lFrac = splitSimhash(simhash);
  		
  		String frac;
  		Map<String, List<Long>> fracMap;
  		final WriteLock writeLock = this.lock.writeLock();
  		writeLock.lock();
  		try {
  			for (int i = 0; i < fracCount; i++) {
  				frac = lFrac.get(i);
  				fracMap = storage.get(i);
  				if (fracMap.containsKey(frac)) {
  					fracMap.get(frac).add(simhash);
  				} else {
  					final List<Long> ls = new ArrayList<Long>();
  					ls.add(simhash);
  					fracMap.put(frac, ls);
  				}
  			}
  		} finally {
  			writeLock.unlock();
  		}
  	}
docs: 按照(frac, <simhash, content>)索引进行存储
  
  @param simhash Simhash值