#43 Read JDBC driver version via reflection (#46)

* #43 Read JDBC driver version via reflection

* #43 Update changelog

doc/changes/changes_1.0.1.md

@@ -1,13 +1,11 @@
-# metabase-driver 1.0.1, released 2022-05-??
+# metabase-driver 1.0.1, released 2022-05-30
 
 Code name: Adapt to Metabase 0.43.1
 
 ## Summary
 
 In this release we adapted the driver to Metabase version 0.43.1 and migrated the build system to deps.edn. This release was only tested with Metabase 0.43.1. If you use an older version of Metabase please use metabase-driver 1.0.0.
 
-Note: During implementation of #35 and #41 the logging of the version for the driver and the Exasol JDBC driver was removed. These features will be added again in [#40](https://github.com/exasol/metabase-driver/issues/40) and [#43](https://github.com/exasol/metabase-driver/issues/43).
-
 ## Features
 
 * #38: Adapted driver to Metabase version 0.43.0
@@ -17,3 +15,4 @@ Note: During implementation of #35 and #41 the logging of the version for the dr
 ## Bugfixes
 
 * #40: Implemented reading driver version from metabase-plugin.yaml
+* #43: Implemented reading JDBC driver version via reflection

src/metabase/driver/exasol.clj

@@ -20,8 +20,19 @@
             [metabase.util.i18n :refer [trs]]
             [yaml.core :as yaml]))
 
-(defn get-jdbc-driver-version []
-  "(unknown)") ; Will be implemented in https://github.com/exasol/metabase-driver/issues/43
+(defn- invoke-static-method
+  "Invoke a static method via reflection"
+  [class-name method-name]
+  (let [class (java.lang.Class/forName class-name)
+        method (.getMethod class method-name (make-array Class 0))
+        result (.invoke method nil (make-array Object 0))]
+    result))
+
+(defn get-jdbc-driver-version
+  "Get the JDBC driver's version number via reflection. This avoids having a runtime dependency on the driver"
+  []
+  (try (invoke-static-method "com.exasol.jdbc.EXADriver" "getVersionInfo")
+       (catch Exception e (log/warn (str "Error getting JDBC driver version: " e)))))
 
 (defn get-driver-version
   "Reads the driver version from the plugin yaml file on the classpath."

test/metabase/driver/exasol_test.clj

@@ -1,15 +1,23 @@
 (ns metabase.driver.exasol-test
-  (:require [clojure.test :refer [deftest testing is]]
+  (:require [clojure.string :as str]
+            [clojure.test :refer [deftest is testing]]
+            [metabase.driver.exasol :as exasol]
+            [metabase.query-processor :as qp]
+            [metabase.query-processor-test :as qp.test]
+            [metabase.query-processor-test.alternative-date-test :as alt-date-test]
             [metabase.test :as mt]
-            [metabase.test.util :as tu]
             [metabase.test.data :as td]
             [metabase.test.data.dataset-definitions :as dataset]
             [metabase.test.data.exasol-dataset-definitions :as exasol-dataset]
-            [metabase.query-processor :as qp]
-            [metabase.query-processor-test :as qp.test]
-            [metabase.query-processor-test.alternative-date-test :as alt-date-test])
+            [metabase.test.util :as tu])
   (:import (java.util TimeZone)))
 
+(deftest get-jdbc-driver-version-test
+  (testing "Getting JDBC driver version succeeds"
+    (is (not (str/blank? (exasol/get-jdbc-driver-version)))))
+  (testing "Getting JDBC driver version returns expected value"
+    (is (= "7.1.10" (exasol/get-jdbc-driver-version)))))
+
 (deftest timezone-id-test
   (mt/test-driver :exasol
                   (is (= "UTC"

test/metabase/driver/exasol_unit_test.clj

@@ -174,10 +174,6 @@
     (testing (format "Unprepare %s" (.getClass value))
       (is (= expected (unprepare/unprepare-value :exasol value))))))
 
-(deftest get-jdbc-driver-version-test
-  (testing "JDBC driver version is not empty"
-    (is (not (str/blank? (exasol/get-jdbc-driver-version))))))
-
 (deftest get-driver-version-test
   (testing "Reading driver version from non existing resource returns nil"
     (is (= nil (exasol/get-driver-version "non-existing-resource.yaml"))))