org.sdmxsource.util.io.OverflowWriteableDataLocation Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of SdmxSourceUtil Show documentation
Show all versions of SdmxSourceUtil Show documentation
Open source reference implementation of SDMX
The newest version!
/*******************************************************************************
* Copyright (c) 2013 Metadata Technology Ltd.
*
* All rights reserved. This program and the accompanying materials are made
* available under the terms of the GNU Lesser General Public License v 3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/lgpl.html
*
* This file is part of the SDMX Component Library.
*
* The SDMX Component Library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the License,
* or (at your option) any later version.
*
* The SDMX Component Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The SDMX Component Library If not, see
* http://www.gnu.org/licenses/lgpl.
*
* Contributors:
* Metadata Technology - initial API and implementation
******************************************************************************/
package org.sdmxsource.util.io;
import org.sdmxsource.sdmx.api.exception.SdmxException;
import org.sdmxsource.sdmx.api.util.WriteableDataLocation;
import java.io.*;
import java.net.URI;
/**
* The type Overflow writeable data location.
*/
public class OverflowWriteableDataLocation implements WriteableDataLocation {
private static final long serialVersionUID = 2278635606454143014L;
private static long maxMemory = 1024l * 1024l * 30; //DEFALUT TO 30Mb
private static long currentMemory = 0l;
private boolean isClosed = false;
private URI tmpUri;
private OutputStream uriOut;
private Buffer inMemoryBuffer = new Buffer();
private String name;
/**
* Instantiates a new Overflow writeable data location.
*/
public OverflowWriteableDataLocation() {
this(null);
}
/**
* Instantiates a new Overflow writeable data location.
*
* @param name the name
*/
public OverflowWriteableDataLocation(String name) {
if (currentMemory > maxMemory) {
tmpUri = URIUtil.getTemporaryURI();
uriOut = URIUtil.getOutputStream(tmpUri);
}
this.name = name;
}
private OverflowWriteableDataLocation(String name, URI tmpUri) {
this.name = name;
this.tmpUri = tmpUri;
uriOut = URIUtil.getOutputStream(tmpUri);
}
private OverflowWriteableDataLocation(String name, Buffer inMemoryBuffer) {
this.name = name;
this.inMemoryBuffer = inMemoryBuffer;
}
/**
* Sets the maximum amount of data to store in memory, in kb
*
* @param maxMemory the max memory
*/
public static void setMaxMemoryKb(long maxMemory) {
OverflowWriteableDataLocation.maxMemory = maxMemory * 1024l;
}
/**
* Returns the current memory usage
*
* @return current memory
*/
public static long getCurrentMemory() {
return currentMemory;
}
/**
* Gets max memory.
*
* @return the max memory
*/
public static long getMaxMemory() {
return maxMemory;
}
@Override
public String getName() {
return name;
}
@Override
public InputStream getInputStream() {
if (uriOut == null) {
return new ByteArrayInputStream(inMemoryBuffer.toByteArray());
}
try {
uriOut.flush();
} catch (IOException e) {
e.printStackTrace();
}
return URIUtil.getInputStream(tmpUri);
}
@Override
public OutputStream getOutputStream() {
return inMemoryBuffer;
}
@Override
public void close() {
if (isClosed) {
return;
}
isClosed = true;
if (uriOut != null) {
URIUtil.closeUri(tmpUri);
URIUtil.deleteUri(tmpUri);
} else if (inMemoryBuffer != null) {
currentMemory -= inMemoryBuffer.getCount();
inMemoryBuffer = null;
}
}
@Override
public boolean isClosed() {
return isClosed;
}
@Override
public String toString() {
if (tmpUri == null) {
return new String(inMemoryBuffer.toByteArray());
}
return "OverflowWriteableDataLocation: " + tmpUri.toString();
}
@Override
public OverflowWriteableDataLocation copy() {
if (this.tmpUri != null) {
// Copy the contents of the URI since the close method deletes the original URI on close.
URI uriCopy = URIUtil.getTemporaryURI();
URIUtil.copyURIs(this.tmpUri, uriCopy);
return new OverflowWriteableDataLocation(name, uriCopy);
} else {
Buffer newBuffer = new Buffer();
StreamUtil.copyStream(getInputStream(), newBuffer);
return new OverflowWriteableDataLocation(name, newBuffer);
}
}
private class Buffer extends ByteArrayOutputStream {
private boolean isOverflow;
@Override
public synchronized void write(byte[] b, int off, int len) {
if (isOverflow) {
try {
uriOut.write(b, off, len);
} catch (IOException e) {
throw new SdmxException(e, "IO Exception whilst trying to write to file output stream: " + tmpUri);
}
} else {
super.write(b, off, len);
checkOverflow(len);
}
}
/**
* Gets count.
*
* @return the count
*/
public int getCount() {
return count;
}
@Override
public void write(int b) {
if (isOverflow) {
try {
uriOut.write(b);
} catch (IOException e) {
throw new SdmxException(e, "IO Exception whilst trying to write to file output stream: " + tmpUri);
}
} else {
super.write(b);
checkOverflow(1);
}
}
private void checkOverflow(int increment) {
currentMemory += increment;
if (currentMemory >= maxMemory) {
isOverflow = true;
//Copy over data to file
if (tmpUri == null) {
//Create an output file
tmpUri = URIUtil.getTemporaryURI();
uriOut = URIUtil.getOutputStream(tmpUri);
}
try {
this.writeTo(uriOut);
} catch (IOException e) {
throw new SdmxException(e, "IO Exception whilst trying to overflow from in memory outputstream to file output stream:" + tmpUri);
}
currentMemory -= super.count;
super.buf = new byte[100];
super.count = 0;
}
}
@Override
public void flush() throws IOException {
if (uriOut != null) {
uriOut.flush();
}
}
}
}