DatabaseService that uses Copycat Raft to provide a strongly consistent and durable database.
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/DatabaseService.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/DatabaseService.java
new file mode 100644
index 0000000..08bfa36
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/DatabaseService.java
@@ -0,0 +1,39 @@
+package org.onlab.onos.store.service;
+
+import java.util.List;
+
+public interface DatabaseService {
+
+ /**
+ * Performs a read on the database.
+ * @param request read request.
+ * @return ReadResult
+ * @throws DatabaseException
+ */
+ ReadResult read(ReadRequest request);
+
+ /**
+ * Performs a batch read operation on the database.
+ * The main advantage of batch read operation is parallelization.
+ * @param batch batch of read requests to execute.
+ * @return
+ */
+ List<OptionalResult<ReadResult, DatabaseException>> batchRead(List<ReadRequest> batch);
+
+ /**
+ * Performs a write operation on the database.
+ * @param request
+ * @return write result.
+ * @throws DatabaseException
+ */
+ WriteResult write(WriteRequest request);
+
+ /**
+ * Performs a batch write operation on the database.
+ * Batch write provides transactional semantics. Either all operations
+ * succeed or none of them do.
+ * @param batch batch of write requests to execute as a transaction.
+ * @return result of executing the batch write operation.
+ */
+ List<OptionalResult<WriteResult, DatabaseException>> batchWrite(List<WriteRequest> batch);
+}