Rearrange sources (#4997)

include/xrpl/basics/Resolver.h

@@ -0,0 +1,71 @@
+//------------------------------------------------------------------------------
+/*
+    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_BASICS_RESOLVER_H_INCLUDED
+#define RIPPLE_BASICS_RESOLVER_H_INCLUDED
+
+#include <functional>
+#include <vector>
+
+#include <ripple/beast/net/IPEndpoint.h>
+
+namespace ripple {
+
+class Resolver
+{
+public:
+    using HandlerType =
+        std::function<void(std::string, std::vector<beast::IP::Endpoint>)>;
+
+    virtual ~Resolver() = 0;
+
+    /** Issue an asynchronous stop request. */
+    virtual void
+    stop_async() = 0;
+
+    /** Issue a synchronous stop request. */
+    virtual void
+    stop() = 0;
+
+    /** Issue a synchronous start request. */
+    virtual void
+    start() = 0;
+
+    /** resolve all hostnames on the list
+        @param names the names to be resolved
+        @param handler the handler to call
+    */
+    /** @{ */
+    template <class Handler>
+    void
+    resolve(std::vector<std::string> const& names, Handler handler)
+    {
+        resolve(names, HandlerType(handler));
+    }
+
+    virtual void
+    resolve(
+        std::vector<std::string> const& names,
+        HandlerType const& handler) = 0;
+    /** @} */
+};
+
+}  // namespace ripple
+
+#endif