[GitHub] [airavata-mft] isururanawaka commented on a change in pull request #1: NIO based file transport implementation

[GitBox <gi...@apache.org>]

isururanawaka commented on a change in pull request #1: NIO based file transport implementation
URL: https://github.com/apache/airavata-mft/pull/1#discussion_r314700755
 
 

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 File path: core/src/main/java/org/apache/airavata/mft/core/bufferedImpl/ChannelUtils.java
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 @@ -0,0 +1,87 @@
+/*
+ *   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.airavata.mft.core.bufferedImpl;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.ReadableByteChannel;
+import java.nio.channels.WritableByteChannel;
+
+/**
+ * Contains the utility methods for Channel Operations
+ */
+public class ChannelUtils {
+
+    /**
+     * Tranfer data from readable byte channel to FileChannel using zero-copy
+     * @param byteChannel
+     * @param to
+     * @throws IOException
+     */
+    public static void transferFrom(ReadableByteChannel byteChannel, FileChannel to) throws IOException {
+        long count;
+        long total = 0;
+        while ((count = to.transferFrom(byteChannel, total, Constants.TRANSFER_MAX_SIZE)) > 0) {
+            total = +count;
+        }
+    }
+
+    /**
+     * Transfer data from FileChannel to writable byte channel using zero-copy
+     * @param to
+     * @param from
+     * @throws IOException
+     */
+    public static void transferTo(WritableByteChannel to, FileChannel from) throws IOException {
+        long count;
+        long total = 0;
+        while ((count = from.transferTo(total, Constants.TRANSFER_MAX_SIZE, to)) > 0) {
+            total = +count;
+        }
+    }
+
+    /**
+     * Copy data from readable byte channel to writable byte channel
+     * @param src
+     * @param dest
+     * @throws IOException
+     */
+    public static void copyData(ReadableByteChannel src,  WritableByteChannel dest) throws IOException {
+        final ByteBuffer buffer = ByteBuffer.allocateDirect(Constants.BUFFER_SIZE);
+        int count = 0;
+        while ((count =src.read(buffer)) != -1) {
 
 Review comment:
   Thread will wait until data is available on the channel. If there is an error e.g   connection is closed then it will return with error.

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