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Subject [GitHub] [airavata-mft] DImuthuUpe commented on a change in pull request #1: NIO based file transport implementation
Date Fri, 16 Aug 2019 04:12:41 GMT
DImuthuUpe commented on a change in pull request #1: NIO based file transport implementation
URL: https://github.com/apache/airavata-mft/pull/1#discussion_r314576170
 
 

 ##########
 File path: core/src/main/java/org/apache/airavata/mft/core/bufferedImpl/AbstractConnector.java
 ##########
 @@ -0,0 +1,86 @@
+/*
+ *   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 org.apache.airavata.mft.core.api.Connector;
+import org.apache.airavata.mft.core.api.SinkConnector;
+import org.apache.airavata.mft.core.api.SourceConnector;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.channels.Channel;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Common class for {@link SinkConnector} and {@link SourceConnector} implementations
+ * This overrides closeChannel method and release all resources allocated to releasing channel
+ */
+public abstract class AbstractConnector implements Connector {
+    ConcurrentHashMap<Channel, Object> channelMap = new ConcurrentHashMap<>();
+
+    @Override
+    public void closeChannel(Channel channel) throws ConnectorException {
+        OutChannel outChannel;
+        InChannel inChannel;
+
+        try {
+            if (channelMap.get(channel) instanceof OutputStream) {
+                outChannel = (OutChannel) channelMap.get(channel);
+                if (outChannel != null) {
+                    outChannel.closeChannel();
+                    channelMap.remove(channel);
+                }
+
+            } else if (channelMap.get(channel) instanceof InputStream) {
+                inChannel = (InChannel) channelMap.get(channel);
+                if (inChannel != null) {
+                    inChannel.closeChannel();
+                    channelMap.remove(channel);
+                }
+            }
+
+        } catch (IOException e) {
+            throw new ConnectorException("Error occurred while closing stream", e);
+        }
+
+    }
+
+    /**
+     * Cache the operating channel
+     * @param channel
+     * @param obj
+     */
+    public void cacheChannel(Channel channel, Object obj) {
 
 Review comment:
   What is the main intention of caching the channel? Do you think that the all channels will
be implemented using NIO Channels?

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