[wallet] Create wallet init interface.

src/Makefile.am

@@ -161,6 +161,7 @@ BITCOIN_CORE_H = \
   validation.h \
   validationinterface.h \
   versionbits.h \
+  walletinitinterface.h \
   wallet/coincontrol.h \
   wallet/crypter.h \
   wallet/db.h \

src/walletinitinterface.h

@@ -0,0 +1,37 @@
+// Copyright (c) 2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef WALLETINITINTERFACE_H
+#define WALLETINITINTERFACE_H
+
+#include <string>
+
+class CScheduler;
+class CRPCTable;
+
+class WalletInitInterface {
+public:
+    /** Get wallet help string */
+    virtual std::string GetHelpString(bool showDebug) = 0;
+    /** Check wallet parameter interaction */
+    virtual bool ParameterInteraction() = 0;
+    /** Register wallet RPC*/
+    virtual void RegisterRPC(CRPCTable &) = 0;
+    /** Verify wallets */
+    virtual bool Verify() = 0;
+    /** Open wallets*/
+    virtual bool Open() = 0;
+    /** Start wallets*/
+    virtual void Start(CScheduler& scheduler) = 0;
+    /** Flush Wallets*/
+    virtual void Flush() = 0;
+    /** Stop Wallets*/
+    virtual void Stop() = 0;
+    /** Close wallets */
+    virtual void Close() = 0;
+
+    virtual ~WalletInitInterface() {}
+};
+
+#endif // WALLETINITINTERFACE_H