Add synchronizer interface - provide synchronization of blocks on con…

…sensus commit

irohad/CMakeLists.txt

@@ -22,4 +22,5 @@ add_subdirectory(validation)
 add_subdirectory(torii)
 add_subdirectory(network)
 add_subdirectory(model)
-add_subdirectory(simulator)
+add_subdirectory(simulator)
+add_subdirectory(synchronizer)

irohad/synchronizer/CMakeLists.txt

@@ -0,0 +1,8 @@
+add_library(synchronizer
+    impl/synchronizer.cpp
+    )
+
+target_link_libraries(synchronizer PUBLIC
+    model
+    rxcpp
+    )

irohad/synchronizer/impl/synchronizer.cpp

@@ -0,0 +1,18 @@
+/**
+ * Copyright Soramitsu Co., Ltd. 2017 All Rights Reserved.
+ * http://soramitsu.co.jp
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <synchronizer/synchronizer.hpp>

irohad/synchronizer/synchronizer.hpp

@@ -0,0 +1,50 @@
+/**
+ * Copyright Soramitsu Co., Ltd. 2017 All Rights Reserved.
+ * http://soramitsu.co.jp
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef IROHA_SYNCHRONIZER_HPP
+#define IROHA_SYNCHRONIZER_HPP
+
+#include <rxcpp/rx.hpp>
+#include <model/block.hpp>
+
+namespace iroha {
+  namespace synchronizer {
+
+    using Commit = rxcpp::observable <model::Block>;
+
+    /**
+     * Synchronizer is interface for fetching missed blocks
+     */
+    class Synchronizer {
+     public:
+
+      /**
+       * Processing block last committed block
+       */
+      virtual void process_commit(model::Block block) = 0;
+
+      /**
+       * Emit committed blocks
+       * Note: from one block received on consensus
+       */
+      virtual rxcpp::observable<Commit> on_commit_chain() = 0;
+
+      virtual ~Synchronizer() = default;
+    };
+  } // namespace synchronizer
+} // namespace iroha
+#endif //IROHA_SYNCHRONIZER_HPP