mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-19 00:01:41 +02:00
7feae906aa
- removed potential null pointer accesses - removed unnecessary casts git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4893 6c8d7289-2bf4-0310-a012-ef5d649a1542
276 lines
10 KiB
Java
276 lines
10 KiB
Java
// kelondroNIOFileRA.java
|
|
// -----------------------
|
|
// part of The Kelondro Database
|
|
// (C) by Michael Peter Christen; mc@anomic.de
|
|
// first published on http://www.anomic.de
|
|
// Frankfurt, Germany, 2002
|
|
// last major change: 21.04.2004
|
|
//
|
|
// 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; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program 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 General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
//
|
|
// Using this software in any meaning (reading, learning, copying, compiling,
|
|
// running) means that you agree that the Author(s) is (are) not responsible
|
|
// for cost, loss of data or any harm that may be caused directly or indirectly
|
|
// by usage of this softare or this documentation. The usage of this software
|
|
// is on your own risk. The installation and usage (starting/running) of this
|
|
// software may allow other people or application to access your computer and
|
|
// any attached devices and is highly dependent on the configuration of the
|
|
// software which must be done by the user of the software; the author(s) is
|
|
// (are) also not responsible for proper configuration and usage of the
|
|
// software, even if provoked by documentation provided together with
|
|
// the software.
|
|
//
|
|
// Any changes to this file according to the GPL as documented in the file
|
|
// gpl.txt aside this file in the shipment you received can be done to the
|
|
// lines that follows this copyright notice here, but changes must not be
|
|
// done inside the copyright notive above. A re-distribution must contain
|
|
// the intact and unchanged copyright notice.
|
|
// Contributions and changes to the program code must be marked as such.
|
|
|
|
package de.anomic.kelondro;
|
|
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.io.RandomAccessFile;
|
|
import java.nio.MappedByteBuffer;
|
|
import java.nio.channels.FileChannel;
|
|
|
|
public class kelondroNIOFileRA extends kelondroAbstractRA implements kelondroRA {
|
|
|
|
protected final static long headSize = 1024;
|
|
|
|
protected RandomAccessFile RAFile;
|
|
protected FileChannel RAChannel;
|
|
protected MappedByteBuffer bufferHead, bufferBody, bufferTail;
|
|
protected long seekPos;
|
|
protected long bodyOffset, tailOffset, tailCurrSize, tailMaxSize;
|
|
protected boolean mapBody;
|
|
protected boolean wroteHead, wroteBody, wroteTail;
|
|
|
|
public kelondroNIOFileRA(String file, boolean mapBody, long tailMaxSize) throws IOException {
|
|
this(new File(file), mapBody, tailMaxSize);
|
|
}
|
|
|
|
public kelondroNIOFileRA(File file, boolean mapBody, long tailMaxSize) throws IOException {
|
|
this.name = file.getName();
|
|
this.file = file;
|
|
this.seekPos = 0;
|
|
this.bodyOffset = headSize;
|
|
if (bodyOffset >= file.length()) {
|
|
bodyOffset = file.length();
|
|
mapBody = false;
|
|
}
|
|
this.tailOffset = file.length();
|
|
this.tailMaxSize = tailMaxSize;
|
|
this.tailCurrSize = 0;
|
|
this.mapBody = mapBody;
|
|
this.RAFile = new RandomAccessFile(file, "rw");
|
|
this.RAChannel = RAFile.getChannel();
|
|
this.bufferHead = RAChannel.map(FileChannel.MapMode.READ_WRITE, 0, (int) bodyOffset);
|
|
if (mapBody)
|
|
this.bufferBody = RAChannel.map(FileChannel.MapMode.READ_WRITE, bodyOffset, (int) (tailOffset - bodyOffset));
|
|
else
|
|
this.bufferBody = null;
|
|
this.bufferTail = null;
|
|
this.wroteHead = false;
|
|
this.wroteBody = false;
|
|
this.wroteTail = false;
|
|
System.out.println("initialized " + name + " mapBody = " + ((mapBody) ? "true" : "false") +
|
|
", bodyOffset = " + bodyOffset + ", tailOffset = " + tailOffset);
|
|
}
|
|
|
|
private boolean growTail(long newPos) throws IOException {
|
|
if (newPos >= tailMaxSize) {
|
|
System.out.println("cannot grow " + name);
|
|
return false;
|
|
}
|
|
if (tailCurrSize == 0) {
|
|
// first grow
|
|
this.tailCurrSize = newPos;
|
|
if (tailCurrSize < 1024) tailCurrSize = 1024;
|
|
if (tailCurrSize > tailMaxSize) tailCurrSize = tailMaxSize;
|
|
} else {
|
|
// next grow
|
|
tailCurrSize = tailCurrSize * 2;
|
|
if (tailCurrSize < newPos) tailCurrSize = newPos;
|
|
if (tailCurrSize > tailMaxSize) tailCurrSize = tailMaxSize;
|
|
bufferTail.force();
|
|
}
|
|
System.out.println("growing " + name + " nextSize=" + tailCurrSize);
|
|
bufferTail = RAChannel.map(FileChannel.MapMode.READ_WRITE, tailOffset, (int) tailCurrSize);
|
|
wroteTail = false;
|
|
return true;
|
|
}
|
|
|
|
public long length() throws IOException {
|
|
return RAFile.length();
|
|
}
|
|
|
|
public long available() throws IOException {
|
|
return RAFile.length() - RAFile.getFilePointer();
|
|
}
|
|
|
|
// pseudo-native method read
|
|
public int read() throws IOException {
|
|
int r;
|
|
if (seekPos < bodyOffset) {
|
|
r = 0xFF & (bufferHead.get((int) seekPos));
|
|
} else if (seekPos < tailOffset) {
|
|
if (mapBody) {
|
|
r = 0xFF & (bufferBody.get((int) (seekPos - bodyOffset)));
|
|
} else {
|
|
RAFile.seek(seekPos);
|
|
r = RAFile.read();
|
|
}
|
|
} else if (seekPos < (tailOffset + tailCurrSize)) {
|
|
r = 0xFF & (bufferTail.get((int) (seekPos - tailOffset)));
|
|
} else {
|
|
r = -1;
|
|
while (growTail(seekPos)) {
|
|
if (seekPos < (tailOffset + tailCurrSize)) {
|
|
r = 0xFF & (bufferTail.get((int) (seekPos - tailOffset)));
|
|
break;
|
|
} else {
|
|
RAFile.seek(seekPos);
|
|
r = RAFile.read();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
seekPos++;
|
|
return r;
|
|
}
|
|
|
|
// pseudo-native method write
|
|
public void write(int b) throws IOException {
|
|
if (seekPos < bodyOffset) {
|
|
bufferHead.put((int) seekPos, (byte) (b & 0xff));
|
|
wroteHead = true;
|
|
} else if (seekPos < tailOffset) {
|
|
if (mapBody) {
|
|
bufferBody.put((int) (seekPos - bodyOffset), (byte) (b & 0xff));
|
|
wroteBody = true;
|
|
} else {
|
|
RAFile.seek(seekPos);
|
|
RAFile.write(b);
|
|
}
|
|
} else if (seekPos < (tailOffset + tailCurrSize)) {
|
|
bufferTail.put((int) (seekPos - tailOffset), (byte) (b & 0xff));
|
|
wroteTail = true;
|
|
} else {
|
|
while (growTail(seekPos)) {
|
|
if (seekPos < (tailOffset + tailCurrSize)) {
|
|
bufferTail.put((int) (seekPos - tailOffset), (byte) (b & 0xff));
|
|
wroteTail = true;
|
|
break;
|
|
} else {
|
|
RAFile.seek(seekPos);
|
|
RAFile.write(b);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
seekPos++;
|
|
}
|
|
|
|
public int read(byte[] b, int off, int len) throws IOException {
|
|
for (int i = 0; i < len; i++) {
|
|
b[off + i] = (byte) read();
|
|
}
|
|
return len;
|
|
}
|
|
|
|
public void write(byte[] b, int off, int len) throws IOException {
|
|
for (int i = 0; i < len; i++) {
|
|
write(b[off + i]);
|
|
}
|
|
}
|
|
|
|
public void seek(long pos) throws IOException {
|
|
seekPos = pos;
|
|
}
|
|
|
|
public void close() throws IOException {
|
|
if (wroteHead) {
|
|
bufferHead.force();
|
|
System.out.println("wrote " + name + " head");
|
|
}
|
|
if ((wroteBody) && (mapBody)) {
|
|
bufferBody.force();
|
|
System.out.println("wrote " + name + " body");
|
|
}
|
|
if (wroteTail) {
|
|
bufferTail.force();
|
|
System.out.println("wrote " + name + " tail");
|
|
}
|
|
RAChannel.close();
|
|
RAChannel = null;
|
|
RAFile.close();
|
|
RAFile = null;
|
|
}
|
|
|
|
protected void finalize() throws Throwable {
|
|
if (RAChannel != null) {
|
|
try {RAChannel.close();}catch(Exception e){}
|
|
}
|
|
if (RAFile != null) {
|
|
try {RAFile.close();}catch(Exception e){}
|
|
}
|
|
}
|
|
|
|
|
|
public static void test1(kelondroRA ra) throws IOException {
|
|
for (int i = 0; i < 2048; i++) {
|
|
ra.seek(i);
|
|
ra.write(32);
|
|
}
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
// tests...
|
|
File f = new File("/yacy/nio.test.txt");
|
|
if (f.exists()) f.delete();
|
|
|
|
System.out.println("* fill with blanks");
|
|
try { kelondroRA ra = new kelondroNIOFileRA(f, true, 2046); test1(ra); ra.close();
|
|
} catch (IOException e) { e.printStackTrace(); }
|
|
|
|
System.out.println("* write in at head");
|
|
try { kelondroRA ra = new kelondroNIOFileRA(f, true, 10);
|
|
ra.seek(8); ra.write((byte) 'h');
|
|
ra.close();
|
|
} catch (IOException e) { e.printStackTrace(); }
|
|
|
|
System.out.println("* write in at body");
|
|
try { kelondroRA ra = new kelondroNIOFileRA(f, true, 10);
|
|
ra.seek(1024); ra.write((byte) 'b');
|
|
ra.close();
|
|
} catch (IOException e) { e.printStackTrace(); }
|
|
|
|
System.out.println("* write in at tail");
|
|
try { kelondroRA ra = new kelondroNIOFileRA(f, true, 10);
|
|
ra.seek(2048); ra.write((byte) 't');
|
|
ra.close();
|
|
} catch (IOException e) { e.printStackTrace(); }
|
|
|
|
System.out.println("* write in behind tail");
|
|
try { kelondroRA ra = new kelondroNIOFileRA(f, true, 10);
|
|
ra.seek(2059); ra.write((byte) 'x');
|
|
ra.close();
|
|
} catch (IOException e) { e.printStackTrace(); }
|
|
}
|
|
|
|
}
|