Prefetching: Introduce store commands abstractions to be used by tasks.

components/offline_pages/core/prefetch/add_unique_urls_task.cc

 // Copyright 2017 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 "components/offline_pages/core/prefetch/add_unique_urls_task.h"
 
+#include <memory>
+
 #include "base/bind.h"
+#include "url/gurl.h"
 
 namespace offline_pages {
 
 AddUniqueUrlsTask::AddUniqueUrlsTask(
-    PrefetchStore* store,
+    std::unique_ptr<AddUrlsStoreCommand> add_urls_command,
+    std::unique_ptr<CleanupZombiesStoreCommand> zombies_cleanup_command,
+    const std::string& name_space,
     const std::vector<PrefetchURL>& prefetch_urls)
-    : prefetch_store_(store),
+    : add_urls_command_(std::move(add_urls_command)),
+      zombies_cleanup_command_(std::move(zombies_cleanup_command)),
+      name_space_(name_space),
       prefetch_urls_(prefetch_urls),
       weak_ptr_factory_(this) {}
 
 AddUniqueUrlsTask::~AddUniqueUrlsTask() {}
 
 void AddUniqueUrlsTask::Run() {
-  CHECK(prefetch_store_);
-  TaskComplete();
+  add_urls_command_->Execute(name_space_, prefetch_urls_,
+                             base::BindOnce(&AddUniqueUrlsTask::OnUrlsAdded,
+                                            weak_ptr_factory_.GetWeakPtr()));
+}
+
+void AddUniqueUrlsTask::OnUrlsAdded(bool success) {
+  if (success) {
+    // TODO(carlosk): schedule NWake here if at least one new entry was added to
+    // the store.

[carlosk, 2017/06/15 22:29:08]

I'll leave this as a TODO right now as it will probably require creating a new
abstraction.

+    std::vector<GURL> urls_to_keep;
+    for (const PrefetchURL& prefetch_url : prefetch_urls_)
+      urls_to_keep.push_back(prefetch_url.url);
+    zombies_cleanup_command_->Execute(
+        name_space_, urls_to_keep,
+        base::BindOnce(&AddUniqueUrlsTask::TaskComplete,
+                       weak_ptr_factory_.GetWeakPtr()));
+  } else {
+    TaskComplete();
+  }
 }
 
 }  // namespace offline_pages