Mmuzaf commented on a change in pull request #5619: IGNITE-10619: CommunicationSpi support channels initial commit
URL: https://github.com/apache/ignite/pull/5619#discussion_r292093533
 
 

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 File path: modules/core/src/main/java/org/apache/ignite/internal/managers/communication/transmit/FileHandler.java
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 @@ -0,0 +1,46 @@
+/*
+ * 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.ignite.internal.managers.communication.transmit;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.Map;
+
+/**
+ * The {@code FileHandler} represents by itself the way of input data stream processing. All the data will
+ * be processed under the hood using zero-copy transferring algorithm and only start file processing and
+ * the end of processing will be provided.
+ */
+public interface FileHandler {
+    /**
+     * @param name The file name transfer from.
+     * @param pos The start pos pointer of download file in original source.
+     * @param cnt Total cnt of bytes readed from the original source.
+     * @param params The additional transfer file description params.
+     * @return The absolute pathname string denoting the file or {@code null} if there is no sense.
+     * @throws IOException If fails.
+     */
+    public String begin(String name, long pos, long cnt, Map<String, Serializable> params) throws IOException;
 
 Review comment:
   1. I've renamed it to `fileAbsoultePath` as it returns a file path.
   2. pos - renamed to offset, cnt - renamed to size. These parameters used when we send a file not from the beginning but from a special offset (e.g. we can transfer a part of the same file placed on different nodes)

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