replaced the storing procedure for the index ram cache with a method that generates BLOBHeap-compatible dumps
this is a migration step to support a new method to store the web index, which will also based on the same data structure. made also a lot of refactoring for a better structuring of the BLOBHeap class. git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5430 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
16 years ago
parent
db1cfae3e7
commit
b6bba18c37
@ -0,0 +1,410 @@
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// kelondroBLOBHeapReader.java
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// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 30.12.2008 on http://yacy.net
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//
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// $LastChangedDate: 2008-03-14 01:16:04 +0100 (Fr, 14 Mrz 2008) $
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// $LastChangedRevision: 4558 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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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;
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import java.io.BufferedInputStream;
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import java.io.DataInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.concurrent.ExecutionException;
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import de.anomic.server.serverMemory;
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import de.anomic.server.logging.serverLog;
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public class kelondroBLOBHeapReader {
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protected int keylength; // the length of the primary key
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protected kelondroBytesLongMap index; // key/seek relation for used records
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protected kelondroBLOBGap free; // set of {seek, size} pairs denoting space and position of free records
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protected final File heapFile; // the file of the heap
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protected final kelondroByteOrder ordering; // the ordering on keys
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protected kelondroCachedFileRA file; // a random access to the file
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public kelondroBLOBHeapReader(
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final File heapFile,
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final int keylength,
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final kelondroByteOrder ordering) throws IOException {
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this.ordering = ordering;
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this.heapFile = heapFile;
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this.keylength = keylength;
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this.index = null; // will be created as result of initialization process
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this.free = null; // will be initialized later depending on existing idx/gap file
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this.file = new kelondroCachedFileRA(heapFile);
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// read or initialize the index
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if (initIndexReadDump(heapFile)) {
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// verify that everything worked just fine
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// pick some elements of the index
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Iterator<byte[]> i = this.index.keys(true, null);
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int c = 3;
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byte[] b, b1 = new byte[index.row().primaryKeyLength];
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long pos;
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boolean ok = true;
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while (i.hasNext() && c-- > 0) {
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b = i.next();
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pos = this.index.getl(b);
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file.seek(pos + 4);
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file.readFully(b1, 0, b1.length);
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if (this.ordering.compare(b, b1) != 0) {
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ok = false;
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break;
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}
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}
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if (!ok) {
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serverLog.logWarning("kelondroBLOBHeap", "verification of idx file for " + heapFile.toString() + " failed, re-building index");
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initIndexReadFromHeap();
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} else {
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serverLog.logInfo("kelondroBLOBHeap", "using a dump of the index of " + heapFile.toString() + ".");
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}
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} else {
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// if we did not have a dump, create a new index
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initIndexReadFromHeap();
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}
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}
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private boolean initIndexReadDump(File f) {
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// look for an index dump and read it if it exist
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// if this is successfull, return true; otherwise false
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File fif = kelondroBLOBHeapWriter.fingerprintIndexFile(f);
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File fgf = kelondroBLOBHeapWriter.fingerprintGapFile(f);
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if (!fif.exists() || !fgf.exists()) {
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kelondroBLOBHeapWriter.deleteAllFingerprints(f);
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return false;
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}
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// there is an index and a gap file:
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// read the index file:
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try {
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this.index = new kelondroBytesLongMap(this.keylength, this.ordering, fif);
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} catch (IOException e) {
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e.printStackTrace();
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return false;
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}
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// an index file is a one-time throw-away object, so just delete it now
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fif.delete();
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// read the gap file:
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try {
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this.free = new kelondroBLOBGap(fgf);
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} catch (IOException e) {
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e.printStackTrace();
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return false;
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}
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// same with gap file
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fgf.delete();
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// everything is fine now
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return this.index.size() > 0;
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}
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private void initIndexReadFromHeap() throws IOException {
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// this initializes the this.index object by reading positions from the heap file
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this.free = new kelondroBLOBGap();
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kelondroBytesLongMap.initDataConsumer indexready = kelondroBytesLongMap.asynchronusInitializer(keylength, this.ordering, 0, Math.max(10, (int) (Runtime.getRuntime().freeMemory() / (10 * 1024 * 1024))));
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byte[] key = new byte[keylength];
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int reclen;
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long seek = 0;
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loop: while (true) { // don't test available() here because this does not work for files > 2GB
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try {
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// go to seek position
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file.seek(seek);
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// read length of the following record without the length of the record size bytes
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reclen = file.readInt();
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//assert reclen > 0 : " reclen == 0 at seek pos " + seek;
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if (reclen == 0) {
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// very bad file inconsistency
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serverLog.logSevere("kelondroBLOBHeap", "reclen == 0 at seek pos " + seek + " in file " + heapFile);
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this.file.setLength(seek); // delete everything else at the remaining of the file :-(
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break loop;
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}
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// read key
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file.readFully(key, 0, key.length);
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} catch (final IOException e) {
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// EOF reached
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break loop; // terminate loop
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}
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// check if this record is empty
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if (key == null || key[0] == 0) {
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// it is an empty record, store to free list
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if (reclen > 0) free.put(seek, reclen);
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} else {
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if (this.ordering.wellformed(key)) {
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indexready.consume(key, seek);
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key = new byte[keylength];
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} else {
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serverLog.logWarning("kelondroBLOBHeap", "BLOB " + heapFile.getName() + ": skiped not wellformed key " + new String(key) + " at seek pos " + seek);
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}
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}
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// new seek position
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seek += 4L + reclen;
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}
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indexready.finish();
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// finish the index generation
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try {
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this.index = indexready.result();
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} catch (InterruptedException e) {
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e.printStackTrace();
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} catch (ExecutionException e) {
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e.printStackTrace();
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}
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}
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public String name() {
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return this.heapFile.getName();
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}
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/**
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* the number of BLOBs in the heap
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* @return the number of BLOBs in the heap
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*/
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public synchronized int size() {
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return this.index.size();
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}
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/**
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* test if a key is in the heap file. This does not need any IO, because it uses only the ram index
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* @param key
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* @return true if the key exists, false otherwise
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*/
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public synchronized boolean has(final byte[] key) {
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assert index != null;
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assert index.row().primaryKeyLength == key.length : index.row().primaryKeyLength + "!=" + key.length;
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// check if the file index contains the key
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try {
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return index.getl(key) >= 0;
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} catch (final IOException e) {
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e.printStackTrace();
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return false;
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}
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}
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public kelondroByteOrder ordering() {
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return this.ordering;
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}
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/**
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* read a blob from the heap
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* @param key
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* @return
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* @throws IOException
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*/
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public synchronized byte[] get(final byte[] key) throws IOException {
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assert index.row().primaryKeyLength == key.length : index.row().primaryKeyLength + "!=" + key.length;
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// check if the index contains the key
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final long pos = index.getl(key);
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if (pos < 0) return null;
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// access the file and read the container
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file.seek(pos);
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final int len = file.readInt() - index.row().primaryKeyLength;
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if (serverMemory.available() < len) {
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if (!serverMemory.request(len, false)) return null; // not enough memory available for this blob
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}
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// read the key
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final byte[] keyf = new byte[index.row().primaryKeyLength];
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file.readFully(keyf, 0, keyf.length);
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if (this.ordering.compare(key, keyf) != 0) {
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// verification of the indexed access failed. we must re-read the index
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serverLog.logWarning("kelondroBLOBHeap", "verification indexed access for " + heapFile.toString() + " failed, re-building index");
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// this is a severe operation, it should never happen.
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// but if the process ends in this state, it would completely fail
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// if the index is not rebuild now at once
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initIndexReadFromHeap();
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}
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// read the blob
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byte[] blob = new byte[len];
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file.readFully(blob, 0, blob.length);
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return blob;
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}
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/**
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* retrieve the size of the BLOB
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* @param key
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* @return the size of the BLOB or -1 if the BLOB does not exist
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* @throws IOException
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*/
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public long length(byte[] key) throws IOException {
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assert index.row().primaryKeyLength == key.length : index.row().primaryKeyLength + "!=" + key.length;
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// check if the index contains the key
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final long pos = index.getl(key);
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if (pos < 0) return -1;
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// access the file and read the size of the container
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file.seek(pos);
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return file.readInt() - index.row().primaryKeyLength;
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}
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/**
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* close the BLOB table
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*/
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public synchronized void close() {
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if (file != null) try {
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file.close();
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} catch (final IOException e) {
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e.printStackTrace();
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}
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file = null;
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free.clear();
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free = null;
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index.close();
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index = null;
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}
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/**
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* ask for the length of the primary key
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* @return the length of the key
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*/
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public int keylength() {
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return this.index.row().primaryKeyLength;
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}
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/**
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* iterator over all keys
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* @param up
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* @param rotating
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* @return
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* @throws IOException
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*/
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public synchronized kelondroCloneableIterator<byte[]> keys(final boolean up, final boolean rotating) throws IOException {
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return new kelondroRotateIterator<byte[]>(this.index.keys(up, null), null, this.index.size());
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}
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/**
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* iterate over all keys
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* @param up
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* @param firstKey
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* @return
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* @throws IOException
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*/
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public synchronized kelondroCloneableIterator<byte[]> keys(final boolean up, final byte[] firstKey) throws IOException {
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return this.index.keys(up, firstKey);
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}
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public long length() throws IOException {
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return this.heapFile.length();
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}
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/**
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* static iterator of entries in BLOBHeap files:
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* this is used to import heap dumps into a write-enabled index heap
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*/
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public static class entries implements Iterator<Map.Entry<String, byte[]>>, Iterable<Map.Entry<String, byte[]>> {
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DataInputStream is;
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int keylen;
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Map.Entry<String, byte[]> nextEntry;
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public entries(final File blobFile, final int keylen) throws IOException {
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if (!(blobFile.exists())) throw new IOException("file " + blobFile + " does not exist");
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this.is = new DataInputStream(new BufferedInputStream(new FileInputStream(blobFile), 1024*1024));
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this.keylen = keylen;
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this.nextEntry = next0();
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}
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public boolean hasNext() {
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return this.nextEntry != null;
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}
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private Map.Entry<String, byte[]> next0() {
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try {
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while (true) {
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int len = is.readInt();
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byte[] key = new byte[this.keylen];
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if (is.read(key) < key.length) return null;
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byte[] payload = new byte[len - this.keylen];
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if (is.read(payload) < payload.length) return null;
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if (key[0] == 0) continue; // this is an empty gap
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return new entry(new String(key), payload);
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}
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} catch (final IOException e) {
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return null;
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}
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}
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public Map.Entry<String, byte[]> next() {
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final Map.Entry<String, byte[]> n = this.nextEntry;
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this.nextEntry = next0();
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return n;
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}
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public void remove() {
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throw new UnsupportedOperationException("blobs cannot be altered during read-only iteration");
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}
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public Iterator<Map.Entry<String, byte[]>> iterator() {
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return this;
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}
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public void close() {
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if (is != null) try { is.close(); } catch (final IOException e) {}
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is = null;
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}
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protected void finalize() {
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this.close();
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}
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}
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public static class entry implements Map.Entry<String, byte[]> {
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private String s;
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private byte[] b;
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public entry(final String s, final byte[] b) {
|
||||||
|
this.s = s;
|
||||||
|
this.b = b;
|
||||||
|
}
|
||||||
|
|
||||||
|
public String getKey() {
|
||||||
|
return s;
|
||||||
|
}
|
||||||
|
|
||||||
|
public byte[] getValue() {
|
||||||
|
return b;
|
||||||
|
}
|
||||||
|
|
||||||
|
public byte[] setValue(byte[] value) {
|
||||||
|
byte[] b1 = b;
|
||||||
|
b = value;
|
||||||
|
return b1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
@ -0,0 +1,151 @@
|
|||||||
|
// kelondroBLOBHeapWriter.java
|
||||||
|
// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
||||||
|
// first published 30.12.2008 on http://yacy.net
|
||||||
|
//
|
||||||
|
// $LastChangedDate: 2008-03-14 01:16:04 +0100 (Fr, 14 Mrz 2008) $
|
||||||
|
// $LastChangedRevision: 4558 $
|
||||||
|
// $LastChangedBy: orbiter $
|
||||||
|
//
|
||||||
|
// LICENSE
|
||||||
|
//
|
||||||
|
// 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
|
||||||
|
|
||||||
|
package de.anomic.kelondro;
|
||||||
|
|
||||||
|
import java.io.BufferedOutputStream;
|
||||||
|
import java.io.DataOutputStream;
|
||||||
|
import java.io.File;
|
||||||
|
import java.io.FileOutputStream;
|
||||||
|
import java.io.IOException;
|
||||||
|
|
||||||
|
import de.anomic.server.logging.serverLog;
|
||||||
|
|
||||||
|
public final class kelondroBLOBHeapWriter {
|
||||||
|
|
||||||
|
private int keylength; // the length of the primary key
|
||||||
|
private kelondroBytesLongMap index; // key/seek relation for used records
|
||||||
|
private final File heapFile; // the file of the heap
|
||||||
|
private DataOutputStream os; // the output stream where the BLOB is written
|
||||||
|
private long seek; // the current write position
|
||||||
|
|
||||||
|
/*
|
||||||
|
* This class implements a BLOB management based on a sequence of records
|
||||||
|
* The data structure is:
|
||||||
|
* file :== record*
|
||||||
|
* record :== reclen key blob
|
||||||
|
* reclen :== <4 byte integer == length of key and blob>
|
||||||
|
* key :== <bytes as defined with keylen, if first byte is zero then record is empty>
|
||||||
|
* blob :== <bytes of length reclen - keylen>
|
||||||
|
* that means that each record has the size reclen+4
|
||||||
|
*
|
||||||
|
* Because the blob sizes are stored with integers, one entry may not exceed 2GB
|
||||||
|
*
|
||||||
|
* With this class a BLOB file can only be written.
|
||||||
|
* To read them, use a kelondroBLOBHeapReader.
|
||||||
|
* A BLOBHeap can be also read and write in random access mode with kelondroBLOBHeap.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/**
|
||||||
|
* create a heap file: a arbitrary number of BLOBs, indexed by an access key
|
||||||
|
* The heap file will be indexed upon initialization.
|
||||||
|
* @param heapFile
|
||||||
|
* @param keylength
|
||||||
|
* @param ordering
|
||||||
|
* @throws IOException
|
||||||
|
*/
|
||||||
|
public kelondroBLOBHeapWriter(final File heapFile, final int keylength, final kelondroByteOrder ordering) throws IOException {
|
||||||
|
this.heapFile = heapFile;
|
||||||
|
this.keylength = keylength;
|
||||||
|
this.index = new kelondroBytesLongMap(keylength, ordering, 10);
|
||||||
|
this.os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(heapFile), 1024 * 1024));
|
||||||
|
this.seek = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* add a BLOB to the heap: this adds the blob always to the end of the file
|
||||||
|
* newly added heap entries must have keys that have not been added before
|
||||||
|
* @param key
|
||||||
|
* @param blob
|
||||||
|
* @throws IOException
|
||||||
|
*/
|
||||||
|
public void add(final byte[] key, final byte[] blob) throws IOException {
|
||||||
|
assert blob.length > 0;
|
||||||
|
assert key.length == this.keylength;
|
||||||
|
assert index.row().primaryKeyLength == key.length : index.row().primaryKeyLength + "!=" + key.length;
|
||||||
|
assert index.getl(key) < 0; // must not occur before
|
||||||
|
if ((blob == null) || (blob.length == 0)) return;
|
||||||
|
int chunkl = key.length + blob.length;
|
||||||
|
os.writeInt(chunkl);
|
||||||
|
os.write(key);
|
||||||
|
os.write(blob);
|
||||||
|
index.addl(key, seek);
|
||||||
|
this.seek += chunkl + 4;
|
||||||
|
}
|
||||||
|
|
||||||
|
protected static File fingerprintIndexFile(File f) {
|
||||||
|
return new File(f.getParentFile(), f.getName() + "." + fingerprintFileHash(f) + ".idx");
|
||||||
|
}
|
||||||
|
|
||||||
|
protected static File fingerprintGapFile(File f) {
|
||||||
|
return new File(f.getParentFile(), f.getName() + "." + fingerprintFileHash(f) + ".gap");
|
||||||
|
}
|
||||||
|
|
||||||
|
protected static String fingerprintFileHash(File f) {
|
||||||
|
return kelondroDigest.fastFingerprintB64(f, false).substring(0, 12);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void deleteAllFingerprints(File f) {
|
||||||
|
File d = f.getParentFile();
|
||||||
|
String n = f.getName();
|
||||||
|
String[] l = d.list();
|
||||||
|
for (int i = 0; i < l.length; i++) {
|
||||||
|
if (l[i].startsWith(n) && (l[i].endsWith(".idx") || l[i].endsWith(".gap"))) new File(d, l[i]).delete();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* close the BLOB table
|
||||||
|
* @throws
|
||||||
|
*/
|
||||||
|
public synchronized void close() {
|
||||||
|
try {
|
||||||
|
os.flush();
|
||||||
|
os.close();
|
||||||
|
} catch (final IOException e) {
|
||||||
|
e.printStackTrace();
|
||||||
|
}
|
||||||
|
os = null;
|
||||||
|
|
||||||
|
if (index.size() > 3) {
|
||||||
|
// now we can create a dump of the index and the gap information
|
||||||
|
// to speed up the next start
|
||||||
|
try {
|
||||||
|
long start = System.currentTimeMillis();
|
||||||
|
new kelondroBLOBGap().dump(fingerprintGapFile(this.heapFile));
|
||||||
|
index.dump(fingerprintIndexFile(this.heapFile));
|
||||||
|
serverLog.logInfo("kelondroBLOBHeapWriter", "wrote a dump for the " + this.index.size() + " index entries of " + heapFile.getName()+ " in " + (System.currentTimeMillis() - start) + " milliseconds.");
|
||||||
|
index.close();
|
||||||
|
index = null;
|
||||||
|
} catch (IOException e) {
|
||||||
|
e.printStackTrace();
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
// this is small.. just free resources, do not write index
|
||||||
|
index.close();
|
||||||
|
index = null;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
Loading…
Reference in new issue