/*******************************************************************************
*Copyright (c) 2009 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, only version 3 of the License.
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*
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Please contact Eucalyptus Systems, Inc., 130 Castilian
* Dr., Goleta, CA 93101 USA or visit <http://www.eucalyptus.com/licenses/>
* if you need additional information or have any questions.
*
* This file may incorporate work covered under the following copyright and
* permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
* Redistribution and use of this software in source and binary forms, with
* or without modification, are permitted provided that the following
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*
* Redistributions of source code must retain the above copyright notice,
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* LICENSED MATERIAL, COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS
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* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA, SANTA
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*******************************************************************************/
/*
*
* Author: Sunil Soman sunils@cs.ucsb.edu
*/
package edu.ucsb.eucalyptus.cloud.ws;
import edu.ucsb.eucalyptus.storage.StorageManager;
import edu.ucsb.eucalyptus.storage.fs.FileIO;
import edu.ucsb.eucalyptus.util.WalrusDataMessage;
import edu.ucsb.eucalyptus.util.EucaSemaphore;
import org.apache.log4j.Logger;
import java.nio.ByteBuffer;
import java.util.concurrent.LinkedBlockingQueue;
public class ObjectReader extends Thread {
private static Logger LOG = Logger.getLogger(ObjectReader.class);
private String bucketName;
private String objectName;
private long objectSize;
private LinkedBlockingQueue<WalrusDataMessage> getQueue;
private StorageManager storageManager;
private long byteRangeStart;
private long byteRangeEnd;
private boolean compressed;
private boolean deleteAfterXfer;
private EucaSemaphore semaphore;
public ObjectReader(String bucketName, String objectName, long objectSize, LinkedBlockingQueue<WalrusDataMessage> getQueue, StorageManager storageManager) {
this.bucketName = bucketName;
this.objectName = objectName;
this.objectSize = objectSize;
this.getQueue = getQueue;
this.storageManager = storageManager;
}
public ObjectReader(String bucketName, String objectName, long objectSize, LinkedBlockingQueue<WalrusDataMessage> getQueue, long byteRangeStart, long byteRangeEnd, StorageManager storageManager) {
this.bucketName = bucketName;
this.objectName = objectName;
this.objectSize = objectSize;
this.getQueue = getQueue;
this.byteRangeStart = byteRangeStart;
this.byteRangeEnd = byteRangeEnd;
this.storageManager = storageManager;
}
public ObjectReader(String bucketName, String objectName, long objectSize, LinkedBlockingQueue<WalrusDataMessage> getQueue, boolean deleteAfterXfer, EucaSemaphore semaphore, StorageManager storageManager) {
this(bucketName, objectName, objectSize, getQueue, storageManager);
this.deleteAfterXfer = deleteAfterXfer;
this.semaphore = semaphore;
}
public void run() {
try {
FileIO fileIO = storageManager.prepareForRead(bucketName, objectName);
long bytesRemaining = objectSize;
long offset = byteRangeStart;
if (byteRangeEnd > 0) {
assert (byteRangeEnd <= objectSize);
assert (byteRangeEnd >= byteRangeStart);
bytesRemaining = byteRangeEnd - byteRangeStart;
if (byteRangeEnd > objectSize || (byteRangeStart < 0))
bytesRemaining = 0;
}
try {
LOG.warn("putting data");
getQueue.put(WalrusDataMessage.StartOfData(bytesRemaining));
while (bytesRemaining > 0) {
int bytesRead = fileIO.read(offset);
if (bytesRead < 0) {
LOG.error("Unable to read object: " + bucketName + "/" + objectName);
break;
}
if ((bytesRemaining - bytesRead) > 0) {
ByteBuffer buffer = fileIO.getBuffer();
if(buffer != null)
getQueue.put(WalrusDataMessage.DataMessage(buffer, bytesRead));
} else {
ByteBuffer buffer = fileIO.getBuffer();
if(buffer != null)
getQueue.put(WalrusDataMessage.DataMessage(buffer, (int) bytesRemaining));
}
bytesRemaining -= bytesRead;
offset += bytesRead;
}
fileIO.finish();
getQueue.put(WalrusDataMessage.EOF());
} catch (Exception ex) {
LOG.error(ex, ex);
}
if (semaphore != null) {
semaphore.release();
synchronized (semaphore) {
semaphore.notifyAll();
}
}
if (deleteAfterXfer) {
try {
storageManager.deleteObject(bucketName, objectName);
} catch (Exception ex) {
LOG.error(ex, ex);
}
}
} catch(Exception ex) {
try {
getQueue.put(WalrusDataMessage.EOF());
} catch(InterruptedException e) {
LOG.error(e);
}
}
}
}