- added a new file reader cache that may serve as full-file-copy of blob database files. This is not yet used
- removed class FileWriter and replaced all usage of that class with CachedFileWriter git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6309 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
16 years ago
parent
fd6b9cb7dc
commit
27d00285aa
@ -0,0 +1,91 @@
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// CachedFileReader.java
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// ---------------------
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// (C) 2009 by Michael Peter Christen; mc@yacy.net
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// first published 09.09.2009 on http://yacy.net
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.kelondro.io.random;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import de.anomic.kelondro.util.MemoryControl;
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public class CachedFileReader extends AbstractReader implements Reader {
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private RandomAccessFile RAFile;
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private byte[] cache;
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private int cachelen;
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public CachedFileReader(final File file) throws IOException, FileNotFoundException {
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this.name = file.getName();
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this.file = file;
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this.RAFile = new RandomAccessFile(this.file, "r");
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if (MemoryControl.available() / 10L > this.RAFile.length() && this.RAFile.length() < (long) Integer.MAX_VALUE) {
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this.cache = new byte[(int) this.RAFile.length()];
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this.RAFile.seek(0);
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this.RAFile.readFully(this.cache);
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} else {
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this.cache = null;
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}
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this.cachelen = 0;
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}
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public synchronized long available() throws IOException {
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return this.length() - RAFile.getFilePointer();
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}
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public synchronized long length() throws IOException {
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return this.RAFile.length();
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}
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public synchronized final void readFully(final byte[] b, final int off, int len) throws IOException {
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long seek = RAFile.getFilePointer();
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if (cache != null && cachelen - seek >= len) {
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// read from cache
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System.arraycopy(cache, (int) (seek), b, off, len);
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RAFile.seek(seek + len);
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return;
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}
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// cannot use the cache
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RAFile.readFully(b, off, len);
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return;
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}
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public synchronized void seek(final long pos) throws IOException {
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RAFile.seek(pos);
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}
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public synchronized void close() {
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if (RAFile != null) try {
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try{RAFile.getChannel().close();} catch (IOException e) {}
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RAFile.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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this.cache = null;
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this.RAFile = null;
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}
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protected void finalize() throws Throwable {
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this.close();
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super.finalize();
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}
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}
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@ -1,103 +0,0 @@
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// RandomAccessFileWriter.java
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// -----------------------
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// (C) 2004-2008 by Michael Peter Christen; mc@yacy.net
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// first published on http://yacy.net
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// Frankfurt, Germany, 09.12.2008
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.kelondro.io.random;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.util.Map;
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public final class FileWriter extends AbstractWriter implements Writer {
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private RandomAccessFile RAFile;
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public FileWriter(final File file) throws IOException, FileNotFoundException {
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this.name = file.getName();
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this.file = file;
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RAFile = new RandomAccessFile(file, "rw");
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}
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public synchronized long length() throws IOException {
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return this.RAFile.length();
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}
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public synchronized void setLength(long length) throws IOException {
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RAFile.setLength(length);
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}
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public synchronized long available() throws IOException {
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return this.length() - RAFile.getFilePointer();
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}
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public synchronized final void readFully(final byte[] b, final int off, int len) throws IOException {
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RAFile.readFully(b, off, len);
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}
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public synchronized void write(final byte[] b, final int off, final int len) throws IOException {
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RAFile.write(b, off, len);
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}
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public synchronized void seek(final long pos) throws IOException {
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RAFile.seek(pos);
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}
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public synchronized void close() throws IOException {
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if (RAFile != null) RAFile.close();
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this.RAFile = null;
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}
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protected void finalize() throws Throwable {
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if (RAFile != null) {
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this.close();
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}
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super.finalize();
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}
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// some static tools
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public static void writeMap(final File f, final Map<String, String> map, final String comment) throws IOException {
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final File fp = f.getParentFile();
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if (fp != null) fp.mkdirs();
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Writer kra = null;
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try {
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kra = new CachedFileWriter(f);
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kra.writeMap(map, comment);
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kra.close();
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} finally {
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if (kra != null) try {kra.close();}catch(final Exception e){}
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}
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}
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public static Map<String, String> readMap(final File f) throws IOException {
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Writer kra = null;
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try {
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kra = new CachedFileWriter(f);
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final Map<String, String> map = kra.readMap();
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kra.close();
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return map;
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} finally {
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if (kra != null) try {kra.close();}catch(final Exception e){}
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}
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}
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}
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