[ADLS] add Get Usages API

specification/datalake-store/resource-manager/Microsoft.DataLakeStore/stable/2016-11-01/account.json

@@ -1148,6 +1148,44 @@
           }
         }
       }
+    },
+	"/subscriptions/{subscriptionId}/providers/Microsoft.DataLakeStore/locations/{location}/usages": {
+      "get": {
+        "tags": [
+          "LocationUsage"
+        ],
+        "operationId": "Locations_GetUsage",
+        "description": "Gets the current usage count and the limit for the resources of the location under the subscription.",
+        "x-ms-examples": {
+          "UsageList": { "$ref": "./examples/Locations_GetUsage.json"}
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "name": "location",
+            "in": "path",
+            "required": true,
+            "type": "string",
+            "description": "The resource location without whitespace."
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK -- current usage count and limit retrieved and returned successfully.",
+            "schema": {
+              "$ref": "#/definitions/UsageListResult"
+            }
+          }
+        },
+        "x-ms-pageable": {
+          "nextLinkName": null
+        }
+      }
     },
     "/subscriptions/{subscriptionId}/providers/Microsoft.DataLakeStore/locations/{location}/checkNameAvailability": {
       "post": {
@@ -1844,7 +1882,78 @@
       },
       "description": "Subscription-level properties and limits for Data Lake Store."
     },
-    "NameAvailabilityInformation": {
+	"UsageName": {
+      "properties": {
+        "value": {
+          "readOnly": true,
+          "type": "string",
+          "description": "Gets a string describing the resource name."
+        },
+        "localizedValue": {
+          "readOnly": true,
+          "type": "string",
+          "description": "Gets a localized string describing the resource name."
+        }
+      },
+      "description": "The usage names that can be used."
+    },
+    "Usage": {
+      "properties": {
+        "unit": {
+          "readOnly": true,
+          "type": "string",
+          "description": "Gets the unit of measurement.",
+          "enum": [
+            "Count",
+            "Bytes",
+            "Seconds",
+            "Percent",
+            "CountsPerSecond",
+            "BytesPerSecond"
+          ],
+          "x-ms-enum": {
+            "name": "UsageUnit",
+            "modelAsString": false
+          }
+        },
+        "id": {
+          "readOnly": true,
+          "type": "string",
+          "description": "Resource identifier."
+        },
+        "currentValue": {
+          "readOnly": true,
+          "type": "integer",
+          "format": "int32",
+          "description": "Gets the current count of the allocated resources in the subscription."
+        },
+        "limit": {
+          "readOnly": true,
+          "type": "integer",
+          "format": "int32",
+          "description": "Gets the maximum count of the resources that can be allocated in the subscription."
+        },
+        "name": {
+          "$ref": "#/definitions/UsageName",
+          "readOnly": true,
+          "description": "Gets the name of the type of usage."
+        }
+      },
+      "description": "Describes the Resource Usage."
+    },
+    "UsageListResult": {
+      "properties": {
+        "value": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/Usage"
+          },
+          "description": "Gets or sets the list of Storage Resource Usages."
+        }
+      },
+      "description": "The response from the List Usages operation."
+    },
+	"NameAvailabilityInformation": {
       "properties": {
         "nameAvailable": {
           "readOnly": true,

specification/datalake-store/resource-manager/Microsoft.DataLakeStore/stable/2016-11-01/examples/Locations_GetUsage.json

@@ -0,0 +1,25 @@
+{
+  "parameters": {
+    "subscriptionId": "{subscription-id}",
+    "location": "WestUS",
+    "api-version": "2016-11-01"
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "value": [
+          {
+            "unit": "Count",
+			      "id": "/subscriptions/0f936178-0d48-4777-a7ab-47860b604941/providers/Microsoft.DataLakeStore/locations/WestUS/usages/DataLakeStoreAccounts",
+            "currentValue": 69,
+            "limit": -1,
+            "name": {
+              "value": "DataLakeStoreAccounts",
+              "localizedValue": "Data Lake Store Accounts"
+            }
+          }
+        ]
+      }
+    }
+  }
+}