1/********************************************************************
2 * Copyright (c) 2013 - 2014, Pivotal Inc.
3 * All rights reserved.
4 *
5 * Author: Zhanwei Wang
6 ********************************************************************/
7/********************************************************************
8 * 2014 -
9 * open source under Apache License Version 2.0
10 ********************************************************************/
11/**
12 * Licensed to the Apache Software Foundation (ASF) under one
13 * or more contributor license agreements. See the NOTICE file
14 * distributed with this work for additional information
15 * regarding copyright ownership. The ASF licenses this file
16 * to you under the Apache License, Version 2.0 (the
17 * "License"); you may not use this file except in compliance
18 * with the License. You may obtain a copy of the License at
19 *
20 * http://www.apache.org/licenses/LICENSE-2.0
21 *
22 * Unless required by applicable law or agreed to in writing, software
23 * distributed under the License is distributed on an "AS IS" BASIS,
24 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25 * See the License for the specific language governing permissions and
26 * limitations under the License.
27 */
28#ifndef _HDFS_LIBHDFS3_CLIENT_PACKETPOOL_H_
29#define _HDFS_LIBHDFS3_CLIENT_PACKETPOOL_H_
30#include "Memory.h"
31
32#include <deque>
33
34namespace Hdfs {
35namespace Internal {
36
37class Packet;
38
39/*
40 * A simple packet pool implementation.
41 *
42 * Packet is created here if no packet is available.
43 * And then add to Pipeline's packet queue to wait for the ack.
44 * The Pipeline's packet queue size is not larger than the PacketPool's max size,
45 * otherwise the write operation will be pending for the ack.
46 * Once the ack is received, packet will reutrn back to the PacketPool to reuse.
47 */
48class PacketPool {
49public:
50 PacketPool(int size);
51 shared_ptr<Packet> getPacket(int pktSize, int chunksPerPkt,
52 int64_t offsetInBlock, int64_t seqno, int checksumSize);
53 void relesePacket(shared_ptr<Packet> packet);
54
55 void setMaxSize(int size) {
56 this->maxSize = size;
57 }
58
59 int getMaxSize() const {
60 return maxSize;
61 }
62
63private:
64 int maxSize;
65 std::deque<shared_ptr<Packet> > packets;
66};
67
68}
69}
70
71#endif /* _HDFS_LIBHDFS3_CLIENT_PACKETPOOL_H_ */
72