Add base/android/activity_status.cc

base/android/activity_status_unittest.cc

Index: base/android/activity_status_unittest.cc
diff --git a/base/android/activity_status_unittest.cc b/base/android/activity_status_unittest.cc
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+++ b/base/android/activity_status_unittest.cc
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+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/android/activity_status.h"
+#include "base/android/jni_android.h"
+#include "base/bind.h"
+#include "base/callback_forward.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "base/run_loop.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/threading/thread.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace android {
+
+namespace {
+
+using base::android::ScopedJavaLocalRef;
+
+// Call org.chromium.base.ActivityStatus.onStateChange() from C++.
+// |env| is the current JNI environment pointer.
+// |activity| is a JNI reference to an activity object. Can be NULL
+// during unit-testing.
+// |newState| is the new state, as an integer.
+//
+// The code below is equivalent to what the JNI generator would output if
+// ActivityStatus.onStateChange() was tagged with @CalledByNative.
+// because this is only useful for unit-testing, there is no point in
+// making this permanent for production code.
+void Java_ActivityStatus_onStateChange(JNIEnv* env,
+                                       jobject activity,
+                                       jint newState) {
+  static const char kActivityStatusClassPath[] =
+      "org/chromium/base/ActivityStatus";
+  static jclass g_ActivityStatus_clazz = NULL;
+  static base::subtle::AtomicWord g_ActivityStatus_onStateChange = 0;
+
+  // Ensure g_ActivityStatus_clazz is initialized
+  if (g_ActivityStatus_clazz == NULL) {
+    g_ActivityStatus_clazz = reinterpret_cast<jclass>(env->NewGlobalRef(
+        base::android::GetClass(env, kActivityStatusClassPath).obj()));
+    DCHECK(g_ActivityStatus_clazz);
+  }
+  jmethodID method_id =
+      base::android::MethodID::LazyGet<base::android::MethodID::TYPE_STATIC>(
+          env,
+          g_ActivityStatus_clazz,
+          "onStateChange",
+          "("
+          "Landroid/app/Activity;"
+          "I"
+          ")"
+          "V",
+          &g_ActivityStatus_onStateChange);
+
+  env->CallStaticVoidMethod(
+      g_ActivityStatus_clazz, method_id, activity, newState);
+  base::android::CheckException(env);
+}
+
+// Change the activity state, return true on success, false otherwise.
+bool ForceActivityStateTo(ActivityState state) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  if (!env)
+    return false;
+
+  RunLoop run_loop;
+  Java_ActivityStatus_onStateChange(env, NULL, static_cast<int>(state));
+  run_loop.RunUntilIdle();
+  return true;
+}
+
+// Used to generate a callback that stores the new state at a given
+// location.
+void StoreStateTo(ActivityState* target, ActivityState state) {
+  *target = state;
+}
+
+// An invalid ActivityState value.
+const ActivityState kInvalidActivityState = static_cast<ActivityState>(100);
+
+// Shared state for the multi-threaded test.
+// This uses a thread to register for events and listen to them,
+// while state changes are forced on the main thread.
+class MultiThreadedTest {
+ public:
+  MultiThreadedTest()
+      : state_(kInvalidActivityState),
+        event_(false, false),
+        thread_("ActivityStatusTest thread"),
+        main_(),
+        listener_(NULL) {}
+
+  void Run() {
+    RunLoop loop;
+
+    // Start the thread and tell it to register for events.
+    thread_.Start();
+    thread_.message_loop()
+        ->PostTask(FROM_HERE,
+                   base::Bind(&MultiThreadedTest::RegisterThreadForEvents,
+                              base::Unretained(this)));
+
+    // Wait for its completion.
+    event_.Wait();
+
+    // Change state, then wait for the thread to modify state.
+    EXPECT_TRUE(ForceActivityStateTo(ACTIVITY_STATE_CREATED));
+    event_.Wait();
+    EXPECT_EQ(ACTIVITY_STATE_CREATED, state_);
+
+    // Again
+    EXPECT_TRUE(ForceActivityStateTo(ACTIVITY_STATE_DESTROYED));
+    event_.Wait();
+    EXPECT_EQ(ACTIVITY_STATE_DESTROYED, state_);
+  }
+
+ private:
+  void ExpectOnThread() {
+    EXPECT_EQ(thread_.message_loop(), base::MessageLoop::current());
+  }
+
+  void RegisterThreadForEvents() {
+    ExpectOnThread();
+    listener_.reset(new ActivityStatus::Listener(base::Bind(
+        &MultiThreadedTest::StoreStateAndSignal, base::Unretained(this))));
+    EXPECT_TRUE(listener_.get());
+    event_.Signal();
+  }
+
+  void StoreStateAndSignal(ActivityState state) {
+    ExpectOnThread();
+    state_ = state;
+    event_.Signal();
+  }
+
+  ActivityState state_;
+  base::WaitableEvent event_;
+  base::Thread thread_;
+  base::MessageLoop main_;
+  scoped_ptr<ActivityStatus::Listener> listener_;
+};
+
+}  // namespace
+
+TEST(ActivityStatusTest, SingleThread) {
+  MessageLoop message_loop;
+
+  ActivityState result = kInvalidActivityState;
+
+  // Create a new listener that stores the new state into |result|
+  // on every state change.
+  scoped_ptr<ActivityStatus::Listener> listener(new ActivityStatus::Listener(
+      base::Bind(&StoreStateTo, base::Unretained(&result))));
+  ASSERT_TRUE(listener.get());
+
+  EXPECT_EQ(kInvalidActivityState, result);
+
+  ASSERT_TRUE(ForceActivityStateTo(ACTIVITY_STATE_CREATED));
+  EXPECT_EQ(ACTIVITY_STATE_CREATED, result);
+
+  ASSERT_TRUE(ForceActivityStateTo(ACTIVITY_STATE_DESTROYED));
+  EXPECT_EQ(ACTIVITY_STATE_DESTROYED, result);
+}
+
+TEST(ActivityStatusTest, TwoThreads) {
+  MultiThreadedTest test;
+  test.Run();
+}
+
+}  // namespace android
+}  // namespace base