Github user VladRodionov commented on a diff in the pull request:
https://github.com/apache/incubator-ratis/pull/4#discussion_r212154701
--- Diff:
ratis-logservice/src/main/java/org/apache/ratis/logservice/api/RecordListener.java
---
@@ -0,0 +1,19 @@
+package org.apache.ratis.logservice.api;
+
+import java.nio.ByteBuffer;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Interface that, when registered with a {@link LogStream}, will receive
all records written
+ * to that LogStream until it is removed.
+ */
+public interface RecordListener {
+
+ /**
+ * Processes the written record from the LogStream.
+ *
+ * @param record The record
+ */
+ CompletableFuture<Void> receiveRecord(ByteBuffer record);
--- End diff --
Again, do not break Listener contract - its synchronous.
---
