Incorporate BlobChannel into Blimp image encode/decode pipeline.

blimp/net/blob_channel/blob_channel_sender.h

 // Copyright 2016 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.
 
 #ifndef BLIMP_NET_BLOB_CHANNEL_BLOB_CHANNEL_SENDER_H_
 #define BLIMP_NET_BLOB_CHANNEL_BLOB_CHANNEL_SENDER_H_
 
-#include <memory>
-#include <set>
-#include <string>
-
-#include "base/macros.h"
-#include "base/threading/thread_checker.h"
 #include "blimp/common/blob_cache/blob_cache.h"
 #include "blimp/net/blimp_net_export.h"
 
 namespace blimp {
 
-// Sends blobs to a remote receiver.
-// The transport-specific details are provided by the caller using the Delegate
-// subclass.
 class BLIMP_NET_EXPORT BlobChannelSender {
  public:
-  // Delegate interface for transport-specific implementations of blob transfer
-  // commands.
-  class Delegate {
-   public:
-    virtual ~Delegate() {}
-
-    // Send blob |id| with payload |data| to the receiver.
-    virtual void DeliverBlob(const BlobId& id, BlobDataPtr data) = 0;
-  };
-
-  BlobChannelSender(std::unique_ptr<BlobCache> cache,
-                    std::unique_ptr<Delegate> delegate);
-  ~BlobChannelSender();
+  virtual ~BlobChannelSender() {}
 
   // Puts a blob in the local BlobChannel. The blob can then be pushed to the
   // remote receiver via "DeliverBlob()".
   // Does nothing if there is already a blob |id| in the channel.
-  void PutBlob(const BlobId& id, BlobDataPtr data);
+  virtual void PutBlob(const BlobId& id, BlobDataPtr data) = 0;
 
   // Sends the blob |id| to the remote side, if the remote side doesn't already
   // have the blob.
-  void DeliverBlob(const BlobId& id);
-
- private:
-  std::unique_ptr<BlobCache> cache_;
-  std::unique_ptr<Delegate> delegate_;
-
-  // Used to track the item IDs in the receiver's cache. This may differ from
-  // the set of IDs in |cache_|, for instance if an ID hasn't yet been
-  // delivered, or has been evicted at the receiver.
-  std::set<BlobId> receiver_cache_contents_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlobChannelSender);
+  virtual void DeliverBlob(const BlobId& id) = 0;
 };
 
 }  // namespace blimp
 
 #endif  // BLIMP_NET_BLOB_CHANNEL_BLOB_CHANNEL_SENDER_H_