private void acquireReadLocks(TxInvocationContext ctx, Object[] readSet)
     throws InterruptedException {
   for (Object key : readSet) {
     lockAndRegisterShareBackupLock(ctx, key);
     ctx.addAffectedKey(key);
   }
 }
  private Object realRemoteGet(
      InvocationContext ctx, Object key, boolean storeInL1, boolean isWrite) throws Throwable {
    if (trace) log.tracef("Doing a remote get for key %s", key);

    boolean acquireRemoteLock = false;
    if (ctx.isInTxScope()) {
      TxInvocationContext txContext = (TxInvocationContext) ctx;
      acquireRemoteLock =
          isWrite && isPessimisticCache && !txContext.getAffectedKeys().contains(key);
    }
    // attempt a remote lookup
    InternalCacheEntry ice = dm.retrieveFromRemoteSource(key, ctx, acquireRemoteLock);

    if (acquireRemoteLock) {
      ((TxInvocationContext) ctx).addAffectedKey(key);
    }

    if (ice != null) {
      if (storeInL1) {
        if (isL1CacheEnabled) {
          if (trace) log.tracef("Caching remotely retrieved entry for key %s in L1", key);
          // This should be fail-safe
          try {
            long lifespan =
                ice.getLifespan() < 0
                    ? configuration.getL1Lifespan()
                    : Math.min(ice.getLifespan(), configuration.getL1Lifespan());
            PutKeyValueCommand put =
                cf.buildPutKeyValueCommand(
                    ice.getKey(), ice.getValue(), lifespan, -1, ctx.getFlags());
            lockAndWrap(ctx, key, ice);
            invokeNextInterceptor(ctx, put);
          } catch (Exception e) {
            // Couldn't store in L1 for some reason.  But don't fail the transaction!
            log.infof("Unable to store entry %s in L1 cache", key);
            log.debug("Inability to store in L1 caused by", e);
          }
        } else {
          CacheEntry ce = ctx.lookupEntry(key);
          if (ce == null || ce.isNull() || ce.isLockPlaceholder() || ce.getValue() == null) {
            if (ce != null && ce.isChanged()) {
              ce.setValue(ice.getValue());
            } else {
              if (isWrite) lockAndWrap(ctx, key, ice);
              else ctx.putLookedUpEntry(key, ice);
            }
          }
        }
      } else {
        if (trace) log.tracef("Not caching remotely retrieved entry for key %s in L1", key);
      }
      return ice.getValue();
    }
    return null;
  }