blob: ded4dd50d10ac2d8bb6721464fe6b5466f90d34f (
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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_MANAGER_H_
#define CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_MANAGER_H_
#include <map>
#include "base/memory/linked_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "chrome/browser/profiles/profile_keyed_service.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace extensions {
// An ApiResourceManager manages the lifetime of a set of resources that
// ApiFunctions use. Examples are sockets or USB connections.
template <class T>
class ApiResourceManager : public ProfileKeyedService,
public base::NonThreadSafe {
public:
explicit ApiResourceManager(BrowserThread::ID thread_id)
: next_id_(1),
thread_id_(thread_id),
api_resource_map_(new std::map<int, linked_ptr<T> >()) {
}
virtual ~ApiResourceManager() {
DCHECK(CalledOnValidThread());
DCHECK(BrowserThread::IsMessageLoopValid(thread_id_)) <<
"A unit test is using an ApiResourceManager but didn't provide "
"the thread message loop needed for that kind of resource. "
"Please ensure that the appropriate message loop is operational.";
BrowserThread::DeleteSoon(thread_id_, FROM_HERE, api_resource_map_);
}
// Takes ownership.
int Add(T* api_resource) {
DCHECK(BrowserThread::CurrentlyOn(thread_id_));
int id = GenerateId();
if (id > 0) {
linked_ptr<T> resource_ptr(api_resource);
(*api_resource_map_)[id] = resource_ptr;
return id;
}
return 0;
}
void Remove(int api_resource_id) {
DCHECK(BrowserThread::CurrentlyOn(thread_id_));
api_resource_map_->erase(api_resource_id);
}
T* Get(int api_resource_id) {
DCHECK(BrowserThread::CurrentlyOn(thread_id_));
linked_ptr<T> ptr = (*api_resource_map_)[api_resource_id];
return ptr.get();
}
private:
// TODO(miket): consider partitioning the ID space by extension ID to make it
// harder for extensions to peek into each others' resources.
int GenerateId() {
return next_id_++;
}
int next_id_;
BrowserThread::ID thread_id_;
// We need finer-grained control over the lifetime of this instance than RAII
// can give us.
std::map<int, linked_ptr<T> >* api_resource_map_;
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_MANAGER_H_
|
