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由于平台资源有限,且硬件平台多样,因此需要屏蔽不同硬件架构和平台资源的不同、以及运行形态的不同,提供统一化的系统服务开发框架。根据RISC-V、Cortex-M、Cortex-A不同硬件平台,分为两种硬件平台,以下简称M核、A核。
系统服务框架基于面向服务的架构,提供了服务开发、服务的子功能开发、对外接口的开发、以及多服务共进程、进程间服务调用等开发能力。其中:
面向服务的架构:
系统服务开发框架主体对象:
表 1 系统服务框架源代码目录结构
继承并重新定义服务:
typedef struct ExampleService {
INHERIT_SERVICE;
INHERIT_IUNKNOWNENTRY(DefaultFeatureApi);
Identity identity;
} ExampleService;
实现服务的生命周期函数:
static const char *GetName(Service *service)
{
return EXAMPLE_SERVICE;
}
static BOOL Initialize(Service *service, Identity identity)
{
ExampleService *example = (ExampleService *)service;
// 保存服务的唯一身份标识,用来自己的IUnknown接口对服务发消息时使用。
example->identity = identity;
return TRUE;
}
static BOOL MessageHandle(Service *service, Request *msg)
{
ExampleService *example = (ExampleService *)service;
switch (msg->msgId) {
case MSG_SYNC:
// 业务处理
break;
default:break;
}
return FALSE;
}
static TaskConfig GetTaskConfig(Service *service)
{
TaskConfig config = {LEVEL_HIGH, PRI_BELOW_NORMAL,
0x800, 20, SHARED_TASK};
return config;
}
创建服务对象:
static ExampleService g_example = {
.GetName = GetName,
.Initialize = Initialize,
.MessageHandle = MessageHandle,
.GetTaskConfig = GetTaskConfig,
SERVER_IPROXY_IMPL_BEGIN,
.Invoke = NULL,
.SyncCall = SyncCall,
IPROXY_END,
};
向SAMGR注册服务及接口:
static void Init(void)
{
SAMGR_GetInstance()->RegisterService((Service *)&g_example);
SAMGR_GetInstance()->RegisterDefaultFeatureApi(EXAMPLE_SERVICE, GET_IUNKNOWN(g_example));
}
定义服务的初始化入口:
SYSEX_SERVICE_INIT(Init);
继承并重新定义功能:
typedef struct DemoFeature {
INHERIT_FEATURE;
INHERIT_IUNKNOWNENTRY(DemoApi);
Identity identity;
Service *parent;
} DemoFeature;
实现功能的生命周期函数:
static const char *FEATURE_GetName(Feature *feature)
{
return EXAMPLE_FEATURE;
}
static void FEATURE_OnInitialize(Feature *feature, Service *parent, Identity identity)
{
DemoFeature *demoFeature = (DemoFeature *)feature;
demoFeature->identity = identity;
demoFeature->parent = parent;
}
static void FEATURE_OnStop(Feature *feature, Identity identity)
{
g_example.identity.queueId = NULL;
g_example.identity.featureId = -1;
g_example.identity.serviceId = -1;
}
static BOOL FEATURE_OnMessage(Feature *feature, Request *request)
{
if (request->msgId == MSG_PROC) {
Response response = {.data = "Yes, you did!", .len = 0};
SAMGR_SendResponse(request, &response);
return TRUE;
} else {
if (request->msgId == MSG_TIME_PROC) {
LOS_Msleep(WAIT_FEATURE_PROC * 10);
if (request->msgValue) {
SAMGR_PrintServices();
} else {
SAMGR_PrintOperations();
}
AsyncTimeCall(GET_IUNKNOWN(g_example));
return FALSE;
}
}
return FALSE;
}
创建功能对象:
static DemoFeature g_example = {
.GetName = FEATURE_GetName,
.OnInitialize = FEATURE_OnInitialize,
.OnStop = FEATURE_OnStop,
.OnMessage = FEATURE_OnMessage,
DEFAULT_IUNKNOWN_ENTRY_BEGIN,
.AsyncCall = AsyncCall,
.AsyncTimeCall = AsyncTimeCall,
.SyncCall = SyncCall,
.AsyncCallBack = AsyncCallBack,
DEFAULT_IUNKNOWN_ENTRY_END,
.identity = {-1, -1, NULL},
};
向SAMGR注册功能及接口:
static void Init(void){
SAMGR_GetInstance()->RegisterFeature(EXAMPLE_SERVICE, (Feature *)&g_example);
SAMGR_GetInstance()->RegisterFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE, GET_IUNKNOWN(g_example));
}
定义功能的初始化入口:
SYSEX_FEATURE_INIT(Init);
定义IUnknown接口:
typedef struct DemoApi {
INHERIT_IUNKNOWN;
BOOL (*AsyncCall)(IUnknown *iUnknown, const char *buff);
BOOL (*AsyncTimeCall)(IUnknown *iUnknown);
BOOL (*SyncCall)(IUnknown *iUnknown, struct Payload *payload);
BOOL (*AsyncCallBack)(IUnknown *iUnknown, const char *buff, Handler handler);
} DemoApi;
定义IUnknown的引用对象:
typedef struct DemoRefApi {
INHERIT_IUNKNOWNENTRY(DemoApi);
} DemoRefApi;
初始化接口对象:
static DemoRefApi api = {
DEFAULT_IUNKNOWN_ENTRY_BEGIN,
.AsyncCall = AsyncCall,
.AsyncTimeCall = AsyncTimeCall,
.SyncCall = SyncCall,
.AsyncCallBack = AsyncCallBack,
DEFAULT_IUNKNOWN_ENTRY_END,
};
注册服务接口:
SAMGR_GetInstance()->RegisterFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE, GET_IUNKNOWN(api));
获取服务的对外接口:
DemoApi *demoApi = NULL;
IUnknown *iUnknown = SAMGR_GetInstance()->GetFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE);
if (iUnknown == NULL) {
return NULL;
}
int result = iUnknown->QueryInterface(iUnknown, DEFAULT_VERSION, (void **)&demoApi);
if (result != 0 || demoApi == NULL) {
return NULL;
}
接口调用:
if (demoApi->AsyncCallBack == NULL) {
return NULL;
}
demoApi->AsyncCallBack((IUnknown *)demoApi, "I wanna async call callback good result!", AsyncHandler);
释放接口:
int32 ref = demoApi->Release((IUnknown *)demoApi);
继承IServerProxy替代继承IUnknown:INHERIT_SERVER_IPROXY
typedef struct DemoFeatureApi {
INHERIT_SERVER_IPROXY;
BOOL (*AsyncCall)(IUnknown *iUnknown, const char *buff);
BOOL (*AsyncTimeCall)(IUnknown *iUnknown);
BOOL (*SyncCall)(IUnknown *iUnknown, struct Payload *payload);
BOOL (*AsyncCallBack)(IUnknown *iUnknown, const char *buff, IOwner notify, INotifyFunc handler);
} DemoFeatureApi;
初始化IServerProxy对象:
static DemoFeature g_example = {
SERVER_IPROXY_IMPL_BEGIN,
.Invoke = Invoke,
.AsyncCall = AsyncCall,
.AsyncTimeCall = AsyncTimeCall,
.SyncCall = SyncCall,
.AsyncCallBack = AsyncCallBack,
IPROXY_END,
};
实现Invoke函数来处理Ipc消息:
static int32 Invoke(IServerProxy *iProxy, int funcId, void *origin, IpcIo *req, IpcIo *reply)
{
DemoFeatureApi *api = (DemoFeatureApi *)iProxy;
BOOL ret;
size_t len = 0;
switch (funcId) {
case ID_ASYNCALL:
ret = api->AsyncCall((IUnknown *)iProxy, (char *)IpcIoPopString(req, &len));
IpcIoPushBool(reply, ret);
break;
case ID_ASYNTIMECALL:
ret = api->AsyncTimeCall((IUnknown *)iProxy);
IpcIoPushBool(reply, ret);
break;
case ID_SYNCCALL: {
struct Payload payload;
payload.id = IpcIoPopInt32(req);
payload.value = IpcIoPopInt32(req);
payload.name = (char *)IpcIoPopString(req, &len);
ret = api->SyncCall((IUnknown *)iProxy, &payload);
IpcIoPushString(reply, ret ? "TRUE" : "FALSE");
}
break;
case ID_ASYNCCALLBACK: { // convert to sync proxy
IpcIoPushString(reply, "Yes, you did!");
IpcIoPushBool(reply, TRUE);
}
break;
default:
IpcIoPushBool(reply, FALSE);
break;
}
return EC_SUCCESS;
}
注册接口:与进程内接口注册一致
SAMGR_GetInstance()->RegisterFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE, GET_IUNKNOWN(g_example));
获取跨进程服务的对外接口:
IClientProxy *demoApi = NULL;
IUnknown *iUnknown = SAMGR_GetInstance()->GetFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE);
if (iUnknown == NULL) {
return NULL;
}
int result = iUnknown->QueryInterface(iUnknown, CLIENT_PROXY_VER, (void **)&demoApi);
if (result != 0 || demoApi == NULL) {
return NULL;
}
调用Ipc消息接口:
IpcIo request;char data[250];
IpcIoInit(&request, data, sizeof(data), 0);
demoApi->Invoke(demoApi, 0, &request, NULL, NULL);
释放接口:
int32 ref = demoApi->Release((IUnknown *)demoApi);
定义IPC接口客户端代理:
typedef struct DemoClientProxy {
INHERIT_CLIENT_IPROXY;
BOOL (*AsyncCall)(IUnknown *iUnknown, const char *buff);
BOOL (*AsyncTimeCall)(IUnknown *iUnknown);
BOOL (*SyncCall)(IUnknown *iUnknown, struct Payload *payload);
BOOL (*AsyncCallBack)(IUnknown *iUnknown, const char *buff, IOwner notify, INotifyFunc handler);
} DemoClientProxy;
typedef struct DemoClientEntry {
INHERIT_IUNKNOWNENTRY(DemoClientProxy);
} DemoClientEntry;
实现客户端代理封装Ipc消息接口:
static BOOL AsyncCall(IUnknown *iUnknown, const char *buff)
{
DemoClientProxy *proxy = (DemoClientProxy *)iUnknown;
IpcIo request;
char data[MAX_DATA_LEN];
IpcIoInit(&request, data, MAX_DATA_LEN, 0);
IpcIoPushString(&request, buff);
int ret = proxy->Invoke((IClientProxy *)proxy, ID_ASYNCALL, &request, NULL, NULL);
return ret == EC_SUCCESS;
}
static BOOL AsyncTimeCall(IUnknown *iUnknown)
{
DemoClientProxy *proxy = (DemoClientProxy *)iUnknown;
IpcIo request;
char data[MAX_DATA_LEN];
IpcIoInit(&request, data, MAX_DATA_LEN, 0);
int ret = proxy->Invoke((IClientProxy *)proxy, ID_ASYNTIMECALL, &request, NULL, NULL);
return ret == EC_SUCCESS;
}
static int Callback(IOwner owner, int code, IpcIo *reply)
{
size_t len = 0;
return strcpy_s(owner, MAX_DATA_LEN, (char *)IpcIoPopString(reply, &len));
}
static BOOL SyncCall(IUnknown *iUnknown, struct Payload *payload)
{
DemoClientProxy *proxy = (DemoClientProxy *)iUnknown;
IpcIo request;
char data[MAX_DATA_LEN];
IpcIoInit(&request, data, MAX_DATA_LEN, 0);
IpcIoPushInt32(&request, payload->id);
IpcIoPushInt32(&request, payload->value);
IpcIoPushString(&request, payload->name);
int ret = proxy->Invoke((IClientProxy *)proxy, ID_SYNCCALL, &request, data, Callback);
data[MAX_DATA_LEN - 1] = 0;
HILOG_INFO(HILOG_MODULE_APP, "[TID:0x%lx]Remote response is %s!", pthread_self(), data);
return ret == EC_SUCCESS;
}
struct CurrentNotify {
IOwner notify;
INotifyFunc handler;
};
static int CurrentCallback(IOwner owner, int code, IpcIo *reply)
{
struct CurrentNotify *notify = (struct CurrentNotify *)owner;
size_t len = 0;
char *response = (char *)IpcIoPopString(reply, &len);
HILOG_INFO(HILOG_MODULE_APP, "[TID:0x%lx]Notify Remote response is %s!", pthread_self(), response);
notify->handler(notify->notify, response);
return EC_SUCCESS;
}
static BOOL AsyncCallBack(IUnknown *iUnknown, const char *buff, IOwner notify, INotifyFunc handler)
{
struct CurrentNotify owner = {notify, handler};
DemoClientProxy *proxy = (DemoClientProxy *)iUnknown;
IpcIo request;
char data[MAX_DATA_LEN];
IpcIoInit(&request, data, MAX_DATA_LEN, 0);
IpcIoPushString(&request, buff);
int ret = proxy->Invoke((IClientProxy *)proxy, ID_ASYNCCALLBACK, &request, &owner, CurrentCallback);
return ret == EC_SUCCESS;
}
实现客户端代理的工厂方法:
void *DEMO_CreatClient(const char *service, const char *feature, uint32 size)
{
(void)service;
(void)feature;
uint32 len = size + sizeof(DemoClientEntry);
uint8 *client = malloc(len);
(void)memset_s(client, len, 0, len);
DemoClientEntry *entry = (DemoClientEntry *)&client[size];
entry->ver = ((uint16)CLIENT_PROXY_VER | (uint16)DEFAULT_VERSION);
entry->ref = 1;
entry->iUnknown.QueryInterface = IUNKNOWN_QueryInterface;
entry->iUnknown.AddRef = IUNKNOWN_AddRef;
entry->iUnknown.Release = IUNKNOWN_Release;
entry->iUnknown.Invoke = NULL;
entry->iUnknown.AsyncCall = AsyncCall;
entry->iUnknown.AsyncTimeCall = AsyncTimeCall;
entry->iUnknown.SyncCall = SyncCall;
entry->iUnknown.AsyncCallBack = AsyncCallBack;
return client;
}
void DEMO_DestroyClient(const char *service, const char *feature, void *iproxy)
{
free(iproxy);
}
将客户端代理的工厂方法注册到SAMGR:
SAMGR_RegisterFactory(EXAMPLE_SERVICE, EXAMPLE_FEATURE, DEMO_CreatClient, DEMO_DestroyClient);
获取跨进程服务的对外接口:
DemoClientProxy *demoApi = NULL;
IUnknown *iUnknown = SAMGR_GetInstance()->GetFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE);
if (iUnknown == NULL) {
return NULL;
}
int result = iUnknown->QueryInterface(iUnknown, DEFAULT_VERSION, (void **)&demoApi);
if (result != 0 || demoApi == NULL) {
return NULL;
}
调用跨进程服务的客户端代理接口:
if (demoApi->AsyncCallBack == NULL) {
return NULL;
}
demoApi->AsyncCallBack((IUnknown *)demoApi,
"I wanna async call callback good result!", NULL, AsyncHandler);
释放接口:
int32 ref = demoApi->Release((IUnknown *)demoApi);
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samgr_lite
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