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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     Vector<MediaResource> resources;
     40 };
     41 
     42 typedef Vector<ResourceInfo> ResourceInfos;
     43 typedef KeyedVector<int, ResourceInfos> PidResourceInfosMap;
     44 
     45 class ResourceManagerService
     46     : public BinderService<ResourceManagerService>,
     47       public BnResourceManagerService
     48 {
     49 public:
     50     static char const *getServiceName() { return "media.resource_manager"; }
     51 
     52     virtual status_t dump(int fd, const Vector<String16>& args);
     53 
     54     ResourceManagerService();
     55     ResourceManagerService(sp<ProcessInfoInterface> processInfo);
     56 
     57     // IResourceManagerService interface
     58     virtual void config(const Vector<MediaResourcePolicy> &policies);
     59 
     60     virtual void addResource(
     61             int pid,
     62             int64_t clientId,
     63             const sp<IResourceManagerClient> client,
     64             const Vector<MediaResource> &resources);
     65 
     66     virtual void removeResource(int pid, int64_t clientId);
     67 
     68     // Tries to reclaim resource from processes with lower priority than the calling process
     69     // according to the requested resources.
     70     // Returns true if any resource has been reclaimed, otherwise returns false.
     71     virtual bool reclaimResource(int callingPid, const Vector<MediaResource> &resources);
     72 
     73 protected:
     74     virtual ~ResourceManagerService();
     75 
     76 private:
     77     friend class ResourceManagerServiceTest;
     78 
     79     // Gets the list of all the clients who own the specified resource type.
     80     // Returns false if any client belongs to a process with higher priority than the
     81     // calling process. The clients will remain unchanged if returns false.
     82     bool getAllClients_l(int callingPid, const String8 &type,
     83             Vector<sp<IResourceManagerClient>> *clients);
     84 
     85     // Gets the client who owns specified resource type from lowest possible priority process.
     86     // Returns false if the calling process priority is not higher than the lowest process
     87     // priority. The client will remain unchanged if returns false.
     88     bool getLowestPriorityBiggestClient_l(int callingPid, const String8 &type,
     89             sp<IResourceManagerClient> *client);
     90 
     91     // Gets lowest priority process that has the specified resource type.
     92     // Returns false if failed. The output parameters will remain unchanged if failed.
     93     bool getLowestPriorityPid_l(const String8 &type, int *pid, int *priority);
     94 
     95     // Gets the client who owns biggest piece of specified resource type from pid.
     96     // Returns false if failed. The client will remain unchanged if failed.
     97     bool getBiggestClient_l(int pid, const String8 &type, sp<IResourceManagerClient> *client);
     98 
     99     bool isCallingPriorityHigher_l(int callingPid, int pid);
    100 
    101     // A helper function basically calls getLowestPriorityBiggestClient_l and add the result client
    102     // to the given Vector.
    103     void getClientForResource_l(
    104         int callingPid, const MediaResource *res, Vector<sp<IResourceManagerClient>> *clients);
    105 
    106     mutable Mutex mLock;
    107     sp<ProcessInfoInterface> mProcessInfo;
    108     sp<ServiceLog> mServiceLog;
    109     PidResourceInfosMap mMap;
    110     bool mSupportsMultipleSecureCodecs;
    111     bool mSupportsSecureWithNonSecureCodec;
    112 };
    113 
    114 // ----------------------------------------------------------------------------
    115 
    116 }; // namespace android
    117 
    118 #endif // ANDROID_RESOURCEMANAGERSERVICE_H
    119