HIDL服务死亡通知实例 hidl_death

HIDL服务死亡通知实例 hidl_death_recipient

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发布时间：2019-05-01

本文共 1431 字，大约阅读时间需要 4 分钟。

//申请hidl_death_recipient的子类struct CameraPolicyServiceClient:         virtual public hardware::hidl_death_recipient    {        CameraPolicyServiceClient(sp
   
     &interface);        ~CameraPolicyServiceClient();        status_t initialize();        // hidl_death_recipient interface - this locks the parent mInterfaceMutex        virtual void serviceDied(uint64_t cookie, const wp
    
     & who) override;        const sp
     
        mInterface;    }；//重写它的 serviceDied() 方法。//实例化一个 hidl_death_recipient 子类对象。CameraHardwareInterface::CameraPolicyServiceClient::CameraPolicyServiceClient(    sp
      
        &interface) :        mInterface(interface){}void CameraHardwareInterface::CameraPolicyServiceClient::serviceDied(uint64_t cookie,        const wp
       
        & who) {    (void) who;   //... do something,cookie可以自定义，只要和linkToDeath保持一致就行    ALOGW("%s: Unexpected serviceDied cookie %" PRIu64 "" ,__FUNCTION__, cookie);}status_t CameraHardwareInterface::CameraPolicyServiceClient::initialize() {  //调用服务的方法 linkToDeath() 给监视器，传入 IDeathRecipient 的接口对象。    hardware::Return
        
          linked = mInterface->linkToDeath(this,0); ALOGE(" CameraPolicyServiceClient::initialize"); if (!linked.isOk()) { ALOGE("%s: Transaction error in linking to ",__FUNCTION__); } else if (!linked) { ALOGE("%s: Unable to linkToDeath",__FUNCTION__); } return OK;}CameraHardwareInterface::CameraPolicyServiceClient::~CameraPolicyServiceClient(){}