1 files changed, 43 insertions, 0 deletions
diff --git a/core/leader-selector.go b/core/leader-selector.go
new file mode 100644
index 0000000..cea31ce
--- /dev/null
+++ b/core/leader-selector.go
@@ -0,0 +1,43 @@
+// Copyright 2018 The dexon-consensus-core Authors
+// This file is part of the dexon-consensus-core library.
+//
+// The dexon-consensus-core library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus-core library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus-core library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"sort"
+
+	"github.com/dexon-foundation/dexon-consensus-core/common"
+	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+)
+
+type leaderSelector struct {
+	common.Hashes
+}
+
+func newLeaderSelector() *leaderSelector {
+	return &leaderSelector{}
+}
+
+func (l *leaderSelector) leaderBlockHash() common.Hash {
+	// TODO(jimmy-dexon): return leader based on paper.
+	sort.Sort(l.Hashes)
+	return l.Hashes[len(l.Hashes)-1]
+}
+
+func (l *leaderSelector) processBlock(block *types.Block) {
+	l.Hashes = append(l.Hashes, block.Hash)
+}