Adding some utility methods for thread verification

Change-Id: I3fb6a1b860bba8a6efe413dd2698f972dc3e2506

1 files changed, 50 insertions, 0 deletions

diff --git a/src/com/android/launcher3/util/Preconditions.java b/src/com/android/launcher3/util/Preconditions.java
new file mode 100644
index 000000000..3760c6372
--- /dev/null
+++ b/src/com/android/launcher3/util/Preconditions.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.util;
+
+import android.os.Looper;
+
+import com.android.launcher3.LauncherModel;
+import com.android.launcher3.config.ProviderConfig;
+
+/**
+ * A set of utility methods for thread verification.
+ */
+public class Preconditions {
+
+    public static void assertWorkerThread() {
+        if (ProviderConfig.IS_DOGFOOD_BUILD && !isSameLooper(LauncherModel.getWorkerLooper())) {
+            throw new IllegalStateException();
+        }
+    }
+
+    public static void assertUIThread() {
+        if (ProviderConfig.IS_DOGFOOD_BUILD && !isSameLooper(Looper.getMainLooper())) {
+            throw new IllegalStateException();
+        }
+    }
+
+    public static void assertNonUiThread() {
+        if (ProviderConfig.IS_DOGFOOD_BUILD && isSameLooper(Looper.getMainLooper())) {
+            throw new IllegalStateException();
+        }
+    }
+
+    private static boolean isSameLooper(Looper looper) {
+        return Looper.myLooper() == looper;
+    }
+}