Java Code Examples for java.util.concurrent.ConcurrentLinkedDeque#pollFirst()

The following examples show how to use java.util.concurrent.ConcurrentLinkedDeque#pollFirst() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: SimpleLifoPool.java    From reactor-pool with Apache License 2.0 5 votes vote down vote up 
@Override
Borrower<POOLABLE> pendingPoll() {
    ConcurrentLinkedDeque<Borrower<POOLABLE>> q = this.pending;
    Borrower<POOLABLE> b = q.pollFirst();
    if (b != null) PENDING_COUNT.decrementAndGet(this);
    return b;
}
Example 2
Source File: ConcurrentSizeBoundedQueue.java    From buffer-slayer with Apache License 2.0 5 votes vote down vote up 
private static List<MessagePromise<?>> removeAll(ConcurrentLinkedDeque<MessagePromise<?>> deque) {
  final List<MessagePromise<?>> result = new LinkedList<>();
  MessagePromise<?> promise;

  while ((promise = deque.pollFirst()) != null) {
    result.add(promise);
  }
  return result;
}
Example 3
Source File: RdmaChannel.java    From SparkRDMA with Apache License 2.0 4 votes vote down vote up 
private void rdmaPostWRList(LinkedList<IbvSendWR> sendWRList) throws IOException {
  if (isError() || isStopped.get()) {
    throw new IOException("QP is in error state, can't post new requests");
  }

  ConcurrentLinkedDeque<SVCPostSend> stack;
  SVCPostSend svcPostSendObject;

  int numWrElements = sendWRList.size();
  // Special case for 0 sgeElements when rdmaSendWithImm
  if (sendWRList.size() == 1 && sendWRList.getFirst().getNum_sge() == 0) {
    numWrElements = NOOP_RESERVED_INDEX;
  }

  stack = svcPostSendCache.computeIfAbsent(numWrElements,
    numElements -> new ConcurrentLinkedDeque<>());

  // To avoid buffer allocations in disni update cached SVCPostSendObject
  if (sendWRList.getFirst().getOpcode() == IbvSendWR.IbvWrOcode.IBV_WR_RDMA_READ.ordinal()
      && (svcPostSendObject = stack.pollFirst()) != null) {
    int i = 0;
    for (IbvSendWR sendWr: sendWRList) {
      SVCPostSend.SendWRMod sendWrMod = svcPostSendObject.getWrMod(i);

      sendWrMod.setWr_id(sendWr.getWr_id());
      sendWrMod.setSend_flags(sendWr.getSend_flags());
      // Setting up RDMA attributes
      sendWrMod.getRdmaMod().setRemote_addr(sendWr.getRdma().getRemote_addr());
      sendWrMod.getRdmaMod().setRkey(sendWr.getRdma().getRkey());
      sendWrMod.getRdmaMod().setReserved(sendWr.getRdma().getReserved());

      if (sendWr.getNum_sge() == 1) {
        IbvSge sge = sendWr.getSge(0);
        sendWrMod.getSgeMod(0).setLkey(sge.getLkey());
        sendWrMod.getSgeMod(0).setAddr(sge.getAddr());
        sendWrMod.getSgeMod(0).setLength(sge.getLength());
      }
      i++;
    }
  } else {
    svcPostSendObject = qp.postSend(sendWRList, null);
  }

  svcPostSendObject.execute();
  // Cache SVCPostSend objects only for RDMA Read requests
  if (sendWRList.getFirst().getOpcode() == IbvSendWR.IbvWrOcode.IBV_WR_RDMA_READ.ordinal()) {
    stack.add(svcPostSendObject);
  } else {
    svcPostSendObject.free();
  }
}