blob: 105b594d2d6a859c46e2659c2a123b641248c057 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
#ifndef QPID_CLUSTER_EXP_BUFFERFACTORY_H
#define QPID_CLUSTER_EXP_BUFFERFACTORY_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/BufferRef.h"
#include "qpid/RefCountedBuffer.h"
#include "qpid/sys/Mutex.h"
#include <algorithm>
namespace qpid {
namespace cluster {
/**
* Factory to allocate sub-buffers of RefCountedBuffers.
* Thread safe.
*/
class BufferFactory
{
public:
/** @param min_size minimum size of underlying buffers. */
inline BufferFactory(size_t min_size);
inline BufferRef get(size_t size);
private:
sys::Mutex lock;
size_t min_size;
BufferRef buf;
char* pos;
};
BufferFactory::BufferFactory(size_t size) : min_size(size) {}
BufferRef BufferFactory::get(size_t size) {
sys::Mutex::ScopedLock l(lock);
if (!buf || pos + size > buf.end()) {
buf = RefCountedBuffer::create(std::max(size, min_size));
pos = buf.begin();
}
assert(buf);
assert(buf.begin() <= pos);
assert(pos + size <= buf.end());
BufferRef ret(buf.sub_buffer(pos, pos+size));
pos += size;
return ret;
}
}} // namespace qpid::cluster
#endif /*!QPID_CLUSTER_EXP_BUFFERFACTORY_H*/
|
