Revert of Refactor FakeAttachmentStore

sync/api/attachments/fake_attachment_store.cc

Index: sync/api/attachments/fake_attachment_store.cc
diff --git a/sync/api/attachments/fake_attachment_store.cc b/sync/api/attachments/fake_attachment_store.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d20a9b5f94a4e0d1751f20b60924c2018ef941bd
--- /dev/null
+++ b/sync/api/attachments/fake_attachment_store.cc
@@ -0,0 +1,128 @@
+// Copyright 2014 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 "sync/api/attachments/fake_attachment_store.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/memory/ref_counted_memory.h"
+#include "base/sequenced_task_runner.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+#include "sync/api/attachments/attachment.h"
+
+namespace syncer {
+
+// Backend is where all the work happens.
+class FakeAttachmentStore::Backend
+    : public base::RefCountedThreadSafe<FakeAttachmentStore::Backend> {
+ public:
+  // Construct a Backend that posts its results to |frontend_task_runner|.
+  Backend(
+      const scoped_refptr<base::SingleThreadTaskRunner>& frontend_task_runner);
+
+  void Read(const AttachmentIdList& ids, const ReadCallback& callback);
+  void Write(const AttachmentList& attachments, const WriteCallback& callback);
+  void Drop(const AttachmentIdList& ids, const DropCallback& callback);
+
+ private:
+  friend class base::RefCountedThreadSafe<Backend>;
+
+  ~Backend();
+
+  scoped_refptr<base::SingleThreadTaskRunner> frontend_task_runner_;
+  AttachmentMap attachments_;
+};
+
+FakeAttachmentStore::Backend::Backend(
+    const scoped_refptr<base::SingleThreadTaskRunner>& frontend_task_runner)
+    : frontend_task_runner_(frontend_task_runner) {}
+
+FakeAttachmentStore::Backend::~Backend() {}
+
+void FakeAttachmentStore::Backend::Read(const AttachmentIdList& ids,
+                                        const ReadCallback& callback) {
+  Result result_code = SUCCESS;
+  AttachmentIdList::const_iterator id_iter = ids.begin();
+  AttachmentIdList::const_iterator id_end = ids.end();
+  scoped_ptr<AttachmentMap> result_map(new AttachmentMap);
+  scoped_ptr<AttachmentIdList> unavailable_attachments(new AttachmentIdList);
+  for (; id_iter != id_end; ++id_iter) {
+    const AttachmentId& id = *id_iter;
+    syncer::AttachmentMap::iterator attachment_iter =
+        attachments_.find(*id_iter);
+    if (attachment_iter != attachments_.end()) {
+      const Attachment& attachment = attachment_iter->second;
+      result_map->insert(std::make_pair(id, attachment));
+    } else {
+      unavailable_attachments->push_back(id);
+    }
+  }
+  if (!unavailable_attachments->empty()) {
+    result_code = UNSPECIFIED_ERROR;
+  }
+  frontend_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(callback,
+                 result_code,
+                 base::Passed(&result_map),
+                 base::Passed(&unavailable_attachments)));
+}
+
+void FakeAttachmentStore::Backend::Write(const AttachmentList& attachments,
+                                         const WriteCallback& callback) {
+  AttachmentList::const_iterator iter = attachments.begin();
+  AttachmentList::const_iterator end = attachments.end();
+  for (; iter != end; ++iter) {
+    attachments_.insert(std::make_pair(iter->GetId(), *iter));
+  }
+  frontend_task_runner_->PostTask(FROM_HERE, base::Bind(callback, SUCCESS));
+}
+
+void FakeAttachmentStore::Backend::Drop(const AttachmentIdList& ids,
+                                        const DropCallback& callback) {
+  Result result = SUCCESS;
+  AttachmentIdList::const_iterator ids_iter = ids.begin();
+  AttachmentIdList::const_iterator ids_end = ids.end();
+  for (; ids_iter != ids_end; ++ids_iter) {
+    AttachmentMap::iterator attachments_iter = attachments_.find(*ids_iter);
+    if (attachments_iter != attachments_.end()) {
+      attachments_.erase(attachments_iter);
+    }
+  }
+  frontend_task_runner_->PostTask(FROM_HERE, base::Bind(callback, result));
+}
+
+FakeAttachmentStore::FakeAttachmentStore(
+    const scoped_refptr<base::SequencedTaskRunner>& backend_task_runner)
+    : backend_(new Backend(base::ThreadTaskRunnerHandle::Get())),
+      backend_task_runner_(backend_task_runner) {}
+
+FakeAttachmentStore::~FakeAttachmentStore() {}
+
+void FakeAttachmentStore::Read(const AttachmentIdList& ids,
+                               const ReadCallback& callback) {
+  backend_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&FakeAttachmentStore::Backend::Read, backend_, ids, callback));
+}
+
+void FakeAttachmentStore::Write(const AttachmentList& attachments,
+                                const WriteCallback& callback) {
+  backend_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&FakeAttachmentStore::Backend::Write,
+                 backend_,
+                 attachments,
+                 callback));
+}
+
+void FakeAttachmentStore::Drop(const AttachmentIdList& ids,
+                               const DropCallback& callback) {
+  backend_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&FakeAttachmentStore::Backend::Drop, backend_, ids, callback));
+}
+
+}  // namespace syncer