1 files changed, 36 insertions, 0 deletions
diff --git a/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/BlockFetchingListener.java b/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/BlockFetchingListener.java
new file mode 100644
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--- /dev/null
+++ b/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/BlockFetchingListener.java
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+package org.apache.spark.network.shuffle;
+
+import java.util.EventListener;
+
+import org.apache.spark.network.buffer.ManagedBuffer;
+
+public interface BlockFetchingListener extends EventListener {
+  /**
+   * Called once per successfully fetched block. After this call returns, data will be released
+   * automatically. If the data will be passed to another thread, the receiver should retain()
+   * and release() the buffer on their own, or copy the data to a new buffer.
+   */
+  void onBlockFetchSuccess(String blockId, ManagedBuffer data);
+
+  /**
+   * Called at least once per block upon failures.
+   */
+  void onBlockFetchFailure(String blockId, Throwable exception);
+}