Add try catch for profiler decorator

tests/app/profiling/profiling-tests.ts

@@ -1,6 +1,20 @@
-import * as TKUnit from "../TKUnit";
+import { assert, assertEqual, assertFalse, assertTrue, assertThrows } from "../TKUnit";
 import * as prof from "tns-core-modules/profiling";
 
+prof.enable();
+class TestClass {
+    @prof.profile("__func_decorator__")
+    doNothing() {
+        //noop
+    }
+
+    @prof.profile("__func_decorator_error__")
+    throwError() {
+        throw new Error("This error is expected");
+    }
+}
+prof.disable();
+
 export function setUp() {
     prof.enable();
 }
@@ -11,56 +25,93 @@ export function tearDown() {
 
 export function test_time_throws_if_not_enabled() {
     prof.disable();
-    TKUnit.assertThrows(prof.time);
+    assertThrows(prof.time);
 };
 
 export function test_time_returns_number_if_enabled() {
-    TKUnit.assertEqual(typeof prof.time(), "number");
+    assertEqual(typeof prof.time(), "number");
 };
 
+export function test_isRunning() {
+    const name = "test_isRunning";
+    assertFalse(prof.isRunning(name), "isRunning should be false before start");
+ 
+    prof.start(name);
+    assertTrue(prof.isRunning(name), "isRunning should be true after start");
+
+    prof.pause(name);
+    assertFalse(prof.isRunning(name), "isRunning should be false after pause");
+
+    prof.start(name);
+    assertTrue(prof.isRunning(name), "isRunning should be true after second start");
+
+    prof.stop(name);
+    assertFalse(prof.isRunning(name), "isRunning should be false after stop");
+}
+
 export function test_start_stop() {
-    prof.start("__test1__");
-    const res = prof.stop("__test1__");
+    const name = "test_start_stop";
 
-    TKUnit.assertEqual(res.count, 1);
-    TKUnit.assert(res.totalTime <= 1);
+    prof.start(name);
+    const res = prof.stop(name);
+
+    assertEqual(res.count, 1);
+    assert(res.totalTime <= 1);
 };
 
-export function test_start_pause() {
+export function test_start_pause_count() {
+    const name = "test_start_pause_count";
+
     for (var i = 0; i < 10; i++) {
-        prof.start("__test2__");
-        prof.pause("__test2__");
+        prof.start(name);
+        prof.pause(name);
     }
 
-    const res = prof.stop("__test2__");
-    TKUnit.assertEqual(res.count, 10);
-    TKUnit.assert(res.totalTime <= 1);
+    const res = prof.stop(name);
+    assertEqual(res.count, 10);
 };
 
-export function test_timer_performance() {
-    for (var i = 0; i < 10000; i++) {
-        prof.start("__test3__");
-        prof.pause("__test3__");
+export function test_start_pause_performance() {
+    const count = 1000;
+    const name = "test_start_pause_performance";
+
+    for (var i = 0; i < count; i++) {
+        prof.start(name);
+        prof.pause(name);
     }
 
-    const res = prof.stop("__test3__");
-    TKUnit.assertEqual(res.count, 10000);
-    TKUnit.assert(res.totalTime <= 30, "Total time for 1000 timer operations is too much: " + res.totalTime);
+    const res = prof.stop(name);
+    assertEqual(res.count, count);
+    assert(res.totalTime <= 50, `Total time for ${count} timer operations is too much: ${res.totalTime}`);
 };
 
-export function test_profile_decorator_count_counts() {
-    class TestClass {
-        @prof.profile("__func_decorator__")
-        f() {
-            //noop
+export function test_profile_decorator_count() {
+    const test = new TestClass();
+    for (var i = 0; i < 10; i++) {
+        test.doNothing();
     }
+
+    const res = prof.stop("__func_decorator__");
+    assertEqual(res.count, 10);
 }
 
+export function test_profile_decorator_performance() {
+    const count = 1000;
+
     const test = new TestClass();
+    for (var i = 0; i < count; i++) {
+        test.doNothing();
+    }
 
-    for (var i = 0; i < 10; i++) {
-        test.f();
-    }
     const res = prof.stop("__func_decorator__");
-    TKUnit.assertEqual(res.count, 10);
+    assertEqual(res.count, count);
+    assert(res.totalTime <= 50, `Total time for ${count} timer operations is too much: ${res.totalTime}`);
+}
+
+export function test_profile_decorator_handles_exceptions() {
+    const test = new TestClass();
+
+    assertThrows(() => test.throwError());
+    assertFalse(prof.isRunning("__func_decorator_error__"), "Timer should be stopped on exception.");
+    assertEqual(prof.stop("__func_decorator_error__").count, 1, "Timer should be called once");
 }

tns-core-modules/profiling/profiling.d.ts

@@ -48,6 +48,13 @@ export declare function pause(name: string): TimerInfo;
  */
 export declare function stop(name: string): TimerInfo;
 
+/**
+ * Returns true if a timer is currently running.
+ * @param name Name of the timer.
+ * @returns true is the timer is currently running.
+ */
+export declare function isRunning(name: string): boolean;
+
 /**
  * Method decorator factory. It will intercept the method call and start and pause a timer before and after the method call.
  * Works only if profiling is enabled.

tns-core-modules/profiling/profiling.ts

@@ -89,14 +89,19 @@ export function stop(name: string): TimerInfo {
     return info;
 }
 
+export function isRunning(name: string): boolean {
+    const info = timers.get(name);
+    return !!(info && info.isRunning);
+}
+
 function pauseInternal(name: string): TimerInfo {
-    let info = timers.get(name);
+    const info = timers.get(name);
     if (!info) {
         throw new Error(`No timer started: ${name}`);
     }
 
     if (info.isRunning) {
-        info.lastTime = Math.round(time() - info.currentStart);
+        info.lastTime = time() - info.currentStart;
         info.totalTime += info.lastTime;
         info.count++;
         info.currentStart = 0;
@@ -128,12 +133,11 @@ export function profile(name?: string): MethodDecorator {
         //editing the descriptor/value parameter
         descriptor.value = function () {
             start(name);
-
-            var result = originalMethod.apply(this, arguments);
-
-            pause(name)
-
-            return result;
+            try {
+                return originalMethod.apply(this, arguments);
+            } finally {
+                pause(name);
+            }
         };
 
         // return edited descriptor as opposed to overwriting the descriptor