Receive app notifications in SimpleCache, so we save our index file

net/android/simple_cache_activity_status_notifier.cc

+// Copyright (c) 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 "net/android/simple_cache_activity_status_notifier.h"
+
+#include "base/android/jni_android.h"
+#include "base/basictypes.h"
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/callback.h"
+#include "base/logging.h"
+#include "base/message_loop.h"
+#include "base/message_loop_proxy.h"
+#include "base/task_runner.h"
+#include "jni/SimpleCacheActivityStatusNotifier_jni.h"
+
+namespace net {
+
+SimpleCacheActivityStatusNotifier::SimpleCacheActivityStatusNotifier(
+    const ActivityStatusChangedCallback& notify_callback)
+    : notify_callback_(notify_callback) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  DCHECK(env);
+  java_obj_.Reset(
+      Java_SimpleCacheActivityStatusNotifier_newInstance(
+          env, reinterpret_cast<jint>(this)));
+}
+
+SimpleCacheActivityStatusNotifier::~SimpleCacheActivityStatusNotifier() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  JNIEnv* env = base::android::AttachCurrentThread();
+  DCHECK(env);
+  Java_SimpleCacheActivityStatusNotifier_prepareToBeDestroyed(
+      env, java_obj_.obj());
+}
+
+void SimpleCacheActivityStatusNotifier::NotifyActivityStatusChanged(
+    JNIEnv* env,
+    jobject obj,
+    jint j_new_activity_status) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  ActivityStatus new_activity_status =
+      static_cast<ActivityStatus>(j_new_activity_status);
+  DCHECK(!notify_callback_.is_null());
+  notify_callback_.Run(new_activity_status);
+}
+
+// static
+bool SimpleCacheActivityStatusNotifier::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace net