Rearrange sources (#4997)

include/xrpl/server/Writer.h

@@ -0,0 +1,60 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_SERVER_WRITER_H_INCLUDED
+#define RIPPLE_SERVER_WRITER_H_INCLUDED
+
+#include <boost/asio/buffer.hpp>
+#include <functional>
+#include <vector>
+
+namespace ripple {
+
+class Writer
+{
+public:
+    virtual ~Writer() = default;
+
+    /** Returns `true` if there is no more data to pull. */
+    virtual bool
+    complete() = 0;
+
+    /** Removes bytes from the input sequence.
+
+        Can be called with 0.
+    */
+    virtual void
+    consume(std::size_t bytes) = 0;
+
+    /** Add data to the input sequence.
+        @param bytes A hint to the number of bytes desired.
+        @param resume A functor to later resume execution.
+        @return `true` if the writer is ready to provide more data.
+    */
+    virtual bool
+    prepare(std::size_t bytes, std::function<void(void)> resume) = 0;
+
+    /** Returns a ConstBufferSequence representing the input sequence. */
+    virtual std::vector<boost::asio::const_buffer>
+    data() = 0;
+};
+
+}  // namespace ripple
+
+#endif