Example #1
0
 /**
  * Load log and rebuild KVServer by iterating over log entries. You do not need to restore the
  * previous cache state (i.e. ignore GETS).
  *
  * @throws KVException if an error occurs in KVServer (though we expect none)
  */
 public void rebuildServer() throws KVException {
   // implement me
   try {
     loadFromDisk();
     kvServer.wipeEverything();
     KVMessage request = null;
     for (KVMessage log : entries) {
       if (log.getMsgType().equals(PUT_REQ) || log.getMsgType().equals(DEL_REQ)) {
         request = log;
       } else if (log.getMsgType().equals(COMMIT)) {
         if (request == null) {
           // Do nothing. If reached here, repeated COMMIT
           continue;
         } else if (request.getMsgType().equals(PUT_REQ)) {
           kvServer.put(request.getKey(), request.getValue());
         } else if (request.getMsgType().equals(DEL_REQ)) {
           kvServer.del(request.getKey());
         }
       } else if (log.getMsgType().equals(ABORT)) {
         request = null;
       }
     }
   } catch (Exception e) {
     // throw new KVException("Error: Rebuild failed");
   }
 }
Example #2
0
  /**
   * Load log and rebuild KVServer by iterating over log entries. You do not need to restore the
   * previous cache state (i.e. ignore GETS).
   *
   * @throws KVException if an error occurs in KVServer (though we expect none)
   */
  public void rebuildServer() throws KVException {
    KVMessage interruptedTPCOperation = null;
    loadFromDisk();
    for (int i = 0; i < entries.size(); i++) {
      //        	System.out.println("rebuild server " + i);
      KVMessage entry = entries.get(i);
      String msgType = entry.getMsgType();

      if (msgType.equals("putreq") || msgType.equals("delreq")) {
        interruptedTPCOperation = entry;
        continue;
      }

      if (msgType.equals("commit") && interruptedTPCOperation != null) {
        if (interruptedTPCOperation.getMsgType().equals("delreq")) {
          kvServer.del(interruptedTPCOperation.getKey());
        } else if (interruptedTPCOperation.getMsgType().equals("putreq")) {
          kvServer.put(interruptedTPCOperation.getKey(), interruptedTPCOperation.getValue());
        }
        interruptedTPCOperation = null;
      } else if (msgType.equals("abort")) {
        interruptedTPCOperation = null;
      }
    }
  }