1 /*
2 **
3 ** Copyright 2015, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 **     http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17 
18 #ifndef ANDROID_RESOURCEMANAGERSERVICE_H
19 #define ANDROID_RESOURCEMANAGERSERVICE_H
20 
21 #include <arpa/inet.h>
22 #include <binder/BinderService.h>
23 #include <utils/Errors.h>
24 #include <utils/KeyedVector.h>
25 #include <utils/String8.h>
26 #include <utils/threads.h>
27 #include <utils/Vector.h>
28 
29 #include <media/IResourceManagerService.h>
30 
31 namespace android {
32 
33 class ServiceLog;
34 struct ProcessInfoInterface;
35 
36 struct ResourceInfo {
37     int64_t clientId;
38     sp<IResourceManagerClient> client;
39     sp<IBinder::DeathRecipient> deathNotifier;
40     Vector<MediaResource> resources;
41 };
42 
43 typedef Vector<ResourceInfo> ResourceInfos;
44 typedef KeyedVector<int, ResourceInfos> PidResourceInfosMap;
45 
46 class ResourceManagerService
47     : public BinderService<ResourceManagerService>,
48       public BnResourceManagerService
49 {
50 public:
getServiceName()51     static char const *getServiceName() { return "media.resource_manager"; }
52 
53     virtual status_t dump(int fd, const Vector<String16>& args);
54 
55     ResourceManagerService();
56     explicit ResourceManagerService(sp<ProcessInfoInterface> processInfo);
57 
58     // IResourceManagerService interface
59     virtual void config(const Vector<MediaResourcePolicy> &policies);
60 
61     virtual void addResource(
62             int pid,
63             int64_t clientId,
64             const sp<IResourceManagerClient> client,
65             const Vector<MediaResource> &resources);
66 
67     virtual void removeResource(int pid, int64_t clientId);
68 
69     // Tries to reclaim resource from processes with lower priority than the calling process
70     // according to the requested resources.
71     // Returns true if any resource has been reclaimed, otherwise returns false.
72     virtual bool reclaimResource(int callingPid, const Vector<MediaResource> &resources);
73 
74     void removeResource(int pid, int64_t clientId, bool checkValid);
75 
76 protected:
77     virtual ~ResourceManagerService();
78 
79 private:
80     friend class ResourceManagerServiceTest;
81 
82     // Gets the list of all the clients who own the specified resource type.
83     // Returns false if any client belongs to a process with higher priority than the
84     // calling process. The clients will remain unchanged if returns false.
85     bool getAllClients_l(int callingPid, MediaResource::Type type,
86             Vector<sp<IResourceManagerClient>> *clients);
87 
88     // Gets the client who owns specified resource type from lowest possible priority process.
89     // Returns false if the calling process priority is not higher than the lowest process
90     // priority. The client will remain unchanged if returns false.
91     bool getLowestPriorityBiggestClient_l(int callingPid, MediaResource::Type type,
92             sp<IResourceManagerClient> *client);
93 
94     // Gets lowest priority process that has the specified resource type.
95     // Returns false if failed. The output parameters will remain unchanged if failed.
96     bool getLowestPriorityPid_l(MediaResource::Type type, int *pid, int *priority);
97 
98     // Gets the client who owns biggest piece of specified resource type from pid.
99     // Returns false if failed. The client will remain unchanged if failed.
100     bool getBiggestClient_l(int pid, MediaResource::Type type, sp<IResourceManagerClient> *client);
101 
102     bool isCallingPriorityHigher_l(int callingPid, int pid);
103 
104     // A helper function basically calls getLowestPriorityBiggestClient_l and add the result client
105     // to the given Vector.
106     void getClientForResource_l(
107         int callingPid, const MediaResource *res, Vector<sp<IResourceManagerClient>> *clients);
108 
109     mutable Mutex mLock;
110     sp<ProcessInfoInterface> mProcessInfo;
111     sp<ServiceLog> mServiceLog;
112     PidResourceInfosMap mMap;
113     bool mSupportsMultipleSecureCodecs;
114     bool mSupportsSecureWithNonSecureCodec;
115 };
116 
117 // ----------------------------------------------------------------------------
118 
119 }; // namespace android
120 
121 #endif // ANDROID_RESOURCEMANAGERSERVICE_H
122