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      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:
     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