org.cloudata.core.commitlog.FileTransferThread.java Source code

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Here is the source code for org.cloudata.core.commitlog.FileTransferThread.java

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/**
 * 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.cloudata.core.commitlog;

import java.io.IOException;
import java.nio.channels.FileChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class FileTransferThread extends Thread {
    static final Log LOG = LogFactory.getLog(FileTransferThread.class);

    Selector selector = Selector.open();
    ServerSocketChannel ssc;
    FileChannel[] channelList;
    String dirName;

    FileTransferThread(String dirName, ServerSocketChannel ssc, FileChannel[] channelList) throws IOException {
        this.dirName = dirName;
        this.ssc = ssc;
        this.channelList = channelList;
        this.ssc.register(selector, SelectionKey.OP_ACCEPT);
    }

    public void run() {
        SocketChannel socketChannel = null;

        try {
            if (selector.select(5000) > 0) {
                Iterator<SelectionKey> iter = selector.selectedKeys().iterator();

                while (iter.hasNext()) {
                    SelectionKey key = iter.next();
                    if (key.isValid() && key.isAcceptable()) {
                        socketChannel = ssc.accept();

                        transfer(channelList, socketChannel);
                    }

                    iter.remove();
                }
            } else {
                LOG.warn("No responses from client asking to transfter file for 5 sec");
            }
        } catch (IOException e) {
            LOG.warn("transfering file is fail", e);
        } finally {
            if (socketChannel != null) {
                try {
                    socketChannel.socket().close();
                    socketChannel.close();
                } catch (IOException e) { /* ignored */
                }
            }
        }

        LOG.debug("File transfer thread is done");
    }

    private void transfer(FileChannel[] channelList, SocketChannel socketChannel) {
        for (FileChannel fc : channelList) {
            try {
                long numTransferred = 0;
                long pos = fc.position();
                long totalLength = fc.size() - pos;
                long count = totalLength;

                LOG.info(dirName + " start File Transfer:" + pos + "," + totalLength);
                while ((numTransferred += fc.transferTo(pos, count, socketChannel)) < totalLength) {
                    pos += numTransferred;
                    count -= numTransferred;
                }
                //LOG.info("End File Transfer:" + pos + "," + totalLength);
            } catch (IOException e) {
                LOG.warn("transfering file is fail due to : ", e);
            } finally {
                if (fc != null) {
                    try {
                        fc.close();
                    } catch (IOException e) {
                        LOG.warn("closing file is fail due to : ", e);
                    }
                }
            }
        }
    }
}