聊一聊鸿蒙系统中的samgr组件

发布于 2021-9-24 16:48
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简介

samgr组件是OpenHarmony的核心组件,提供OpenHarmony系统服务启动、注册、查询等功能。

聊一聊鸿蒙系统中的samgr组件-开源基础软件社区

目录

/foundation/distributedschedule/services/samgr/
├── native
│   ├── BUILD.gn  # 部件编译脚本
│   ├── include   # 头文件存放目录
│   ├── samgr.rc  # samgr启动配置文件
│   ├── source    # 源代码存放目录
│   ├── test      # 测试代码存放目录

说明

  1. samgr服务接收到sa框架层发送的注册消息,会在本地缓存中存入系统服务相关信息。

    int32_t SystemAbilityManager::AddSystemAbility(int32_t systemAbilityId, const sptr<IRemoteObject>& ability,
        const SAExtraProp& extraProp)
    {
        if (!CheckInputSysAbilityId(systemAbilityId) || ability == nullptr || (!CheckCapability(extraProp.capability))) {
            HILOGE("AddSystemAbilityExtra input params is invalid.");
            return ERR_INVALID_VALUE;
        }
        {
            unique_lock<shared_mutex> writeLock(abilityMapLock_);
            auto saSize = abilityMap_.size();
            if (saSize >= MAX_SERVICES) {
                HILOGE("map size error, (Has been greater than %zu)", saSize);
                return ERR_INVALID_VALUE;
            }
            SAInfo saInfo;
            saInfo.remoteObj = ability;
            saInfo.isDistributed = extraProp.isDistributed;
            saInfo.capability = extraProp.capability;
            saInfo.permission = Str16ToStr8(extraProp.permission);
            abilityMap_[systemAbilityId] = std::move(saInfo);
            HILOGI("insert %{public}d. size : %zu,", systemAbilityId, abilityMap_.size());
        }
        if (abilityDeath_ != nullptr) {
            ability->AddDeathRecipient(abilityDeath_);
        }
        FindSystemAbilityManagerNotify(systemAbilityId, ADD_SYSTEM_ABILITY_TRANSACTION);
        u16string strName = Str8ToStr16(to_string(systemAbilityId));
        if (extraProp.isDistributed && dBinderService_ != nullptr) {
            dBinderService_->RegisterRemoteProxy(strName, ability);
            HILOGD("AddSystemAbility RegisterRemoteProxy, serviceId is %{public}d", systemAbilityId);
        }
        if (systemAbilityDataStorage_ == nullptr) {
            HILOGE("AddSystemAbility systemAbilityDataStorage not init!");
            return ERR_NO_INIT;
        }
        if (extraProp.isDistributed) {
            systemAbilityDataStorage_->ClearSyncRecords();
            DoInsertSaData(strName, ability, extraProp);
        }
    }
    
  2. 对于本地服务而言,samgr服务接收到sa框架层发送的获取消息,会通过服务id,查找到对应服务的代理对象,然后返回给sa框架。

    sptr<IRemoteObject> SystemAbilityManager::CheckSystemAbility(int32_t systemAbilityId)
    {
        if (!CheckInputSysAbilityId(systemAbilityId)) {
            return nullptr;
        }
    
        std::string selectedDeviceId;
        if (CheckRemoteSa(to_string(systemAbilityId), selectedDeviceId)) {
           return CheckSystemAbility(systemAbilityId, selectedDeviceId);
        }
    
        shared_lock<shared_mutex> readLock(abilityMapLock_);
        auto iter = abilityMap_.find(systemAbilityId);
        if (iter != abilityMap_.end()) {
            auto callingUid = IPCSkeleton::GetCallingUid();
            if (IsSystemApp(callingUid) || CheckPermission(iter->second.permission)) {
                 return iter->second.remoteObj;
            }
            return nullptr;
        }
        return nullptr;
    }
    

相关仓

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distributedschedule_samgr-master.zip 99.92K 0次下载
已于2021-9-24 16:48:46修改
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