Add a DistilledContentStore (and an in-memory impl)

components/dom_distiller/core/distilled_content_store.h

Index: components/dom_distiller/core/distilled_content_store.h
diff --git a/components/dom_distiller/core/distilled_content_store.h b/components/dom_distiller/core/distilled_content_store.h
new file mode 100644
index 0000000000000000000000000000000000000000..b6b26956218e642e97e10c4b3d10e835f8d6e9ea
--- /dev/null
+++ b/components/dom_distiller/core/distilled_content_store.h
@@ -0,0 +1,53 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.

[shashi, 2014/03/13 00:32:45]

2014

[cjhopman, 2014/03/18 16:06:10]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_CONTENT_CACHE_H_

[shashi, 2014/03/13 00:32:45]

s/CACHE/STORE/

[cjhopman, 2014/03/18 16:06:10]

Done.

+#define COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_CONTENT_CACHE_H_
+
+#include "base/bind.h"
+#include "components/dom_distiller/core/article_entry.h"
+#include "components/dom_distiller/core/proto/distilled_article.pb.h"
+
+namespace dom_distiller {
+
+// This is a simple interface for saving and loading of distilled content for an
+// ArticleEntry.
+class DistilledContentStore {
+ public:
+  typedef base::Callback<
+      void(bool /* success */, scoped_ptr<DistilledArticleProto>)> LoadCallback;
+  typedef base::Callback<void(bool /* success */)> SaveCallback;
+
+  virtual void SaveContent(const ArticleEntry& entry,
+                           const DistilledArticleProto& proto,
+                           SaveCallback callback) = 0;
+  virtual void LoadContent(const ArticleEntry& entry,
+                           LoadCallback callback) = 0;
+
+  virtual ~DistilledContentStore() {}
+};
+
+class InMemoryContentStore : public DistilledContentStore {
+ public:
+  InMemoryContentStore();
+  virtual ~InMemoryContentStore();
+
+  // DistilledContentStore implementation
+  virtual void SaveContent(const ArticleEntry& entry,
+                           const DistilledArticleProto& proto,
+                           SaveCallback callback) OVERRIDE;
+  virtual void LoadContent(const ArticleEntry& entry,
+                           LoadCallback callback) OVERRIDE;
+
+  // Synchronously saves the content.
+  void InjectContent(const ArticleEntry& entry,
+                     const DistilledArticleProto& proto);
+
+ private:
+  typedef std::map<std::string, DistilledArticleProto> ContentMap;

[shashi, 2014/03/13 00:32:45]

why not base::hash_map?

[cjhopman, 2014/03/18 16:06:10]

Done.

+  ContentMap cache_;
+};
+}  // dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_CONTENT_CACHE_H_