resource.h
2.85 KB
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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright 2012 The MITRE Corporation *
* *
* Licensed 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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifndef __RESOURCE_H
#define __RESOURCE_H
#include <QHash>
#include <QList>
#include <QMutex>
#include <QSemaphore>
#include <QSharedPointer>
#include <QString>
#include <QThread>
template <typename T>
class ResourceMaker
{
public:
virtual ~ResourceMaker() {}
virtual T *make() const = 0;
};
template <typename T>
class DefaultResourceMaker : public ResourceMaker<T>
{
T *make() const { return new T(); }
};
template <typename T>
class Resource
{
QSharedPointer< ResourceMaker<T> > resourceMaker;
QSharedPointer< QList<T*> > availableResources;
QSharedPointer<QMutex> lock;
QSharedPointer<QSemaphore> totalResources;
public:
Resource(ResourceMaker<T> *rm = new DefaultResourceMaker<T>())
: resourceMaker(rm)
, availableResources(new QList<T*>())
, lock(new QMutex())
, totalResources(new QSemaphore(QThread::idealThreadCount()))
{}
~Resource()
{
qDeleteAll(*availableResources);
}
T *acquire() const
{
totalResources->acquire();
lock->lock();
if (availableResources->isEmpty())
availableResources->append(resourceMaker->make());
T* resource = availableResources->takeFirst();
lock->unlock();
return resource;
}
void release(T *resource) const
{
lock->lock();
availableResources->append(resource);
lock->unlock();
totalResources->release();
}
void setResourceMaker(ResourceMaker<T> *maker)
{
resourceMaker = QSharedPointer< ResourceMaker<T> >(maker);
}
void setMaxResources(int max)
{
totalResources = QSharedPointer<QSemaphore>(new QSemaphore(max));
}
};
#endif //__RESOURCE_H