!1793 新增接口GetCachedParameter

Merge pull request !1793 from cheng_jinsong/init-cached

services/include/param/sys_param.h

@@ -86,6 +86,7 @@ CachedHandle CachedParameterCreate(const char *name, const char *defValue);
  *
  */
 const char *CachedParameterGet(CachedHandle handle);
+const char *CachedParameterGetChanged(CachedHandle handle, int *changed);
 
 /**
  * 外部接口

services/param/base/param_base.c

@@ -710,7 +710,7 @@ CachedHandle CachedParameterCreate(const char *name, const char *defValue)
     return (CachedHandle)param;
 }
 
-STATIC_INLINE const char *CachedParameterCheck(CachedParameter *param)
+STATIC_INLINE const char *CachedParameterCheck(CachedParameter *param, int *changed)
 {
     if (param->dataIndex == 0) {
         // no change, do not to find
@@ -737,7 +737,8 @@ STATIC_INLINE const char *CachedParameterCheck(CachedParameter *param)
     param->dataCommitId = dataCommitId;
     int ret = ReadParamValue_(entry, &param->dataCommitId, param->paramValue, &length);
     PARAM_CHECK(ret == 0, return NULL, "Failed to copy value %s", param->data);
-    PARAM_LOGI("CachedParameterCheck %u", param->dataCommitId);
+    PARAM_LOGV("CachedParameterCheck %u", param->dataCommitId);
+    *changed = 1;
     return param->paramValue;
 }
 
@@ -745,7 +746,17 @@ const char *CachedParameterGet(CachedHandle handle)
 {
     CachedParameter *param = (CachedParameter *)handle;
     PARAM_CHECK(param != NULL, return NULL, "Invalid handle");
-    return CachedParameterCheck(param);
+    int changed = 0;
+    return CachedParameterCheck(param, &changed);
+}
+
+const char *CachedParameterGetChanged(CachedHandle handle, int *changed)
+{
+    CachedParameter *param = (CachedParameter *)handle;
+    PARAM_CHECK(param != NULL, return NULL, "Invalid handle");
+    PARAM_CHECK(changed != NULL, return NULL, "Invalid changed");
+    *changed = 0;
+    return CachedParameterCheck(param, changed);
 }
 
 void CachedParameterDestroy(CachedHandle handle)

test/unittest/param/param_unittest.cpp

@@ -642,8 +642,10 @@ HWTEST_F(ParamUnitTest, TestParamCache, TestSize.Level0)
     EXPECT_EQ(strcmp(value, "false"), 0);
     ret = WriteParam(name, "2222222", &dataIndex, 0);
     EXPECT_EQ(ret, 0);
-    value = CachedParameterGet(cacheHandle3);
+    int valueChange = 0;
+    value = CachedParameterGetChanged(cacheHandle3, &valueChange);
     EXPECT_EQ(strcmp(value, "2222222"), 0);
+    EXPECT_EQ(valueChange, 1);
     CachedParameterDestroy(cacheHandle3);
 }
 #ifdef PARAM_SUPPORT_SELINUX