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513 lines
18 KiB
513 lines
18 KiB
// SplitTable.java
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// (C) 2006 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 12.10.2006 on http://www.anomic.de
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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 net.yacy.kelondro.table;
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import java.io.File;
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import java.io.IOException;
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import java.text.ParseException;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Random;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.LinkedBlockingQueue;
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import java.util.concurrent.ThreadPoolExecutor;
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import java.util.concurrent.TimeUnit;
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import net.yacy.cora.date.GenericFormatter;
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import net.yacy.kelondro.blob.ArrayStack;
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import net.yacy.kelondro.index.Cache;
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import net.yacy.kelondro.index.HandleSet;
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import net.yacy.kelondro.index.Index;
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import net.yacy.kelondro.index.Row;
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import net.yacy.kelondro.index.RowCollection;
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import net.yacy.kelondro.index.RowSpaceExceededException;
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import net.yacy.kelondro.index.Row.Entry;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.order.CloneableIterator;
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import net.yacy.kelondro.order.MergeIterator;
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import net.yacy.kelondro.order.Order;
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import net.yacy.kelondro.order.StackIterator;
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import net.yacy.kelondro.util.FileUtils;
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import net.yacy.kelondro.util.NamePrefixThreadFactory;
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public class SplitTable implements Index, Iterable<Row.Entry> {
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// this is a set of kelondro tables
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// the set is divided into tables with different entry date
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// the table type can be either kelondroFlex or kelondroEco
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private static final int EcoFSBufferSize = 20;
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// the thread pool for the keeperOf executor service
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private ExecutorService executor;
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private Map<String, Index> tables; // a map from a date string to a kelondroIndex object
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private final Row rowdef;
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private final File path;
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private final String prefix;
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private final Order<Row.Entry> entryOrder;
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private String current;
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private long fileAgeLimit;
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private long fileSizeLimit;
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private boolean useTailCache;
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private boolean exceed134217727;
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public SplitTable(
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final File path,
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final String tablename,
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final Row rowdef,
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final boolean useTailCache,
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final boolean exceed134217727) throws RowSpaceExceededException {
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this(path, tablename, rowdef, ArrayStack.oneMonth, (long) Integer.MAX_VALUE, useTailCache, exceed134217727);
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}
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private SplitTable(
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final File path,
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final String tablename,
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final Row rowdef,
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final long fileAgeLimit,
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final long fileSizeLimit,
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final boolean useTailCache,
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final boolean exceed134217727) throws RowSpaceExceededException {
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this.path = path;
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this.prefix = tablename;
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this.rowdef = rowdef;
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this.fileAgeLimit = fileAgeLimit;
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this.fileSizeLimit = fileSizeLimit;
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this.useTailCache = useTailCache;
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this.exceed134217727 = exceed134217727;
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this.entryOrder = new Row.EntryComparator(rowdef.objectOrder);
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init();
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}
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public long mem() {
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long m = 0;
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for (Index i: tables.values()) m += i.mem();
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return m;
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}
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public final byte[] smallestKey() {
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HandleSet keysort = new HandleSet(this.rowdef.primaryKeyLength, this.rowdef.objectOrder, this.tables.size());
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for (Index oi: this.tables.values()) try {
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keysort.put(oi.smallestKey());
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} catch (RowSpaceExceededException e) {
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Log.logException(e);
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}
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return keysort.smallestKey();
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}
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public final byte[] largestKey() {
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HandleSet keysort = new HandleSet(this.rowdef.primaryKeyLength, this.rowdef.objectOrder, this.tables.size());
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for (Index oi: this.tables.values()) try {
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keysort.put(oi.largestKey());
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} catch (RowSpaceExceededException e) {
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Log.logException(e);
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}
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return keysort.largestKey();
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}
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private String newFilename() {
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return prefix + "." + GenericFormatter.SHORT_MILSEC_FORMATTER.format() + ".table";
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}
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private void init() throws RowSpaceExceededException {
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current = null;
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// initialized tables map
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this.tables = new HashMap<String, Index>();
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if (!(path.exists())) path.mkdirs();
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String[] tablefile = path.list();
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// zero pass: migrate old table names
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File f;
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Random r = new Random(System.currentTimeMillis());
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for (int i = 0; i < tablefile.length; i++) {
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if ((tablefile[i].startsWith(prefix)) &&
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(tablefile[i].charAt(prefix.length()) == '.') &&
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(tablefile[i].length() == prefix.length() + 7)) {
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f = new File(path, tablefile[i]);
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String newname = tablefile[i] + "0100000" + (Long.toString(r.nextLong())+"00000").substring(1,5) + ".table";
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f.renameTo(new File(path, newname));
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}
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}
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// read new list again
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tablefile = path.list();
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// first pass: find tables
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final HashMap<String, Long> t = new HashMap<String, Long>();
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long ram, time, maxtime = 0;
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Date d;
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for (int i = 0; i < tablefile.length; i++) {
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if ((tablefile[i].startsWith(prefix)) &&
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(tablefile[i].charAt(prefix.length()) == '.') &&
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(tablefile[i].length() == prefix.length() + 24)) {
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f = new File(path, tablefile[i]);
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try {
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d = GenericFormatter.SHORT_MILSEC_FORMATTER.parse(tablefile[i].substring(prefix.length() + 1, prefix.length() + 18));
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} catch (ParseException e) {
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Log.logSevere("SplitTable", "", e);
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continue;
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}
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time = d.getTime();
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if (time > maxtime) {
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current = tablefile[i];
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assert this.current != null;
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maxtime = time;
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}
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t.put(tablefile[i], Table.staticRAMIndexNeed(f, rowdef));
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}
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}
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// second pass: open tables
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Iterator<Map.Entry<String, Long>> i;
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Map.Entry<String, Long> entry;
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String maxf;
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long maxram;
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Index table;
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while (!t.isEmpty()) {
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// find maximum table
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maxram = 0;
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maxf = null;
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i = t.entrySet().iterator();
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while (i.hasNext()) {
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entry = i.next();
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ram = entry.getValue().longValue();
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if (maxf == null || ram > maxram) {
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maxf = entry.getKey();
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maxram = ram;
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}
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}
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// open next biggest table
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t.remove(maxf);
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f = new File(path, maxf);
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Log.logInfo("kelondroSplitTable", "opening partial eco table " + f);
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try {
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table = new Table(f, rowdef, EcoFSBufferSize, 0, this.useTailCache, this.exceed134217727);
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} catch (RowSpaceExceededException e) {
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table = new Table(f, rowdef, 0, 0, false, this.exceed134217727);
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}
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tables.put(maxf, table);
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}
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assert this.current == null || this.tables.get(this.current) != null : "this.current = " + this.current;
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// init the thread pool for the keeperOf executor service
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this.executor = new ThreadPoolExecutor(
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Math.max(tables.size(), Runtime.getRuntime().availableProcessors()) + 1,
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Math.max(tables.size(), Runtime.getRuntime().availableProcessors()) + 1, 10,
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TimeUnit.SECONDS,
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new LinkedBlockingQueue<Runnable>(),
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new NamePrefixThreadFactory(prefix));
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}
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public void clear() throws IOException {
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this.close();
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final String[] l = path.list();
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for (int i = 0; i < l.length; i++) {
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if (l[i].startsWith(prefix)) {
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final File f = new File(path, l[i]);
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if (f.isDirectory()) delete(path, l[i]); else FileUtils.deletedelete(f);
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}
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}
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try {
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init();
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} catch (RowSpaceExceededException e) {
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useTailCache = false;
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try {
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init();
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} catch (RowSpaceExceededException e1) {
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throw new IOException(e1.getMessage());
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}
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}
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}
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public static void delete(final File path, final String tablename) {
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final File tabledir = new File(path, tablename);
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if (!(tabledir.exists())) return;
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if ((!(tabledir.isDirectory()))) {
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FileUtils.deletedelete(tabledir);
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return;
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}
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final String[] files = tabledir.list();
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for (int i = 0; i < files.length; i++) {
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FileUtils.deletedelete(new File(tabledir, files[i]));
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}
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FileUtils.deletedelete(tabledir);
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}
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public String filename() {
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return new File(path, prefix).toString();
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}
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public int size() {
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final Iterator<Index> i = tables.values().iterator();
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int s = 0;
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while (i.hasNext()) s += i.next().size();
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return s;
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}
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public boolean isEmpty() {
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final Iterator<Index> i = tables.values().iterator();
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while (i.hasNext()) if (!i.next().isEmpty()) return false;
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return true;
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}
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public int writeBufferSize() {
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int s = 0;
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for (final Index index : tables.values()) {
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if (index instanceof Cache) s += ((Cache) index).writeBufferSize();
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}
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return s;
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}
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public Row row() {
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return this.rowdef;
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}
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public boolean has(final byte[] key) {
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return keeperOf(key) != null;
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}
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public Row.Entry get(final byte[] key) throws IOException {
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final Index keeper = keeperOf(key);
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if (keeper == null) return null;
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return keeper.get(key);
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}
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private Index newTable() {
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this.current = newFilename();
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final File f = new File(path, this.current);
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Table table = null;
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try {
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table = new Table(f, rowdef, EcoFSBufferSize, 0, this.useTailCache, this.exceed134217727);
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} catch (RowSpaceExceededException e) {
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try {
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table = new Table(f, rowdef, 0, 0, false, this.exceed134217727);
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} catch (RowSpaceExceededException e1) {
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Log.logException(e1);
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}
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}
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tables.put(this.current, table);
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assert this.current == null || this.tables.get(this.current) != null : "this.current = " + this.current;
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return table;
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}
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private Index checkTable(Index table) {
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// check size and age of given table; in case it is too large or too old
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// create a new table
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assert table != null;
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String name = new File(table.filename()).getName();
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long d;
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try {
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d = GenericFormatter.SHORT_MILSEC_FORMATTER.parse(name.substring(prefix.length() + 1, prefix.length() + 18)).getTime();
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} catch (ParseException e) {
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Log.logSevere("SplitTable", "", e);
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d = 0;
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}
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if (d + this.fileAgeLimit < System.currentTimeMillis() || new File(this.path, name).length() >= this.fileSizeLimit) {
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return newTable();
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}
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return table;
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}
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public Row.Entry replace(final Row.Entry row) throws IOException, RowSpaceExceededException {
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assert row.objectsize() <= this.rowdef.objectsize;
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Index keeper = keeperOf(row.getPrimaryKeyBytes());
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if (keeper != null) return keeper.replace(row);
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synchronized (this.tables) {
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assert this.current == null || this.tables.get(this.current) != null : "this.current = " + this.current;
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keeper = (this.current == null) ? newTable() : checkTable(this.tables.get(this.current));
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}
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keeper.put(row);
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return null;
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}
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/**
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* Adds the row to the index. The row is identified by the primary key of the row.
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* @param row a index row
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* @return true if this set did _not_ already contain the given row.
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* @throws IOException
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* @throws RowSpaceExceededException
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*/
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public boolean put(final Row.Entry row) throws IOException, RowSpaceExceededException {
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assert row.objectsize() <= this.rowdef.objectsize;
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byte[] key = row.getPrimaryKeyBytes();
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if (tables == null) return true;
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synchronized (this.tables) {
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Index keeper = keeperOf(key);
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if (keeper != null) return keeper.put(row);
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assert this.current == null || this.tables.get(this.current) != null : "this.current = " + this.current;
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keeper = (this.current == null) ? newTable() : checkTable(this.tables.get(this.current));
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boolean b = keeper.put(row);
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assert b;
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return b;
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}
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}
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private Index keeperOf(final byte[] key) {
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if (key == null) return null;
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if (tables == null) return null;
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for (Index oi: tables.values()) {
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if (oi.has(key)) return oi;
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}
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return null;
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}
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public void addUnique(final Row.Entry row) throws IOException, RowSpaceExceededException {
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assert row.objectsize() <= this.rowdef.objectsize;
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Index table = (this.current == null) ? null : tables.get(this.current);
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synchronized (this.tables) {
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assert this.current == null || this.tables.get(this.current) != null : "this.current = " + this.current;
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if (table == null) table = newTable(); else table = checkTable(table);
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}
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table.addUnique(row);
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}
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public List<RowCollection> removeDoubles() throws IOException, RowSpaceExceededException {
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final Iterator<Index> i = tables.values().iterator();
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final List<RowCollection> report = new ArrayList<RowCollection>();
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while (i.hasNext()) {
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report.addAll(i.next().removeDoubles());
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}
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return report;
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}
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public boolean delete(final byte[] key) throws IOException {
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final Index table = keeperOf(key);
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if (table == null) return false;
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return table.delete(key);
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}
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public Row.Entry remove(final byte[] key) throws IOException {
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final Index table = keeperOf(key);
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if (table == null) return null;
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return table.remove(key);
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}
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public Row.Entry removeOne() throws IOException {
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final Iterator<Index> i = tables.values().iterator();
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Index table, maxtable = null;
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int maxcount = -1;
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while (i.hasNext()) {
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table = i.next();
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if (table.size() > maxcount) {
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maxtable = table;
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maxcount = table.size();
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}
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}
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if (maxtable == null) {
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return null;
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}
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return maxtable.removeOne();
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}
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public List<Row.Entry> top(int count) throws IOException {
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final Iterator<Index> i = tables.values().iterator();
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Index table, maxtable = null;
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int maxcount = -1;
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while (i.hasNext()) {
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table = i.next();
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if (table.size() > maxcount) {
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maxtable = table;
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maxcount = table.size();
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}
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}
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if (maxtable == null) {
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return null;
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}
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return maxtable.top(count);
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}
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public CloneableIterator<byte[]> keys(final boolean up, final byte[] firstKey) throws IOException {
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final List<CloneableIterator<byte[]>> c = new ArrayList<CloneableIterator<byte[]>>(tables.size());
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final Iterator<Index> i = tables.values().iterator();
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CloneableIterator<byte[]> k;
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while (i.hasNext()) {
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k = i.next().keys(up, firstKey);
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if (k != null) c.add(k);
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}
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return MergeIterator.cascade(c, rowdef.objectOrder, MergeIterator.simpleMerge, up);
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}
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public CloneableIterator<Row.Entry> rows(final boolean up, final byte[] firstKey) throws IOException {
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final List<CloneableIterator<Row.Entry>> c = new ArrayList<CloneableIterator<Row.Entry>>(tables.size());
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final Iterator<Index> i = tables.values().iterator();
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while (i.hasNext()) {
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c.add(i.next().rows(up, firstKey));
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}
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return MergeIterator.cascade(c, entryOrder, MergeIterator.simpleMerge, up);
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}
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public Iterator<Entry> iterator() {
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try {
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return rows();
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} catch (IOException e) {
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return null;
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}
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}
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@SuppressWarnings("unchecked")
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public synchronized CloneableIterator<Row.Entry> rows() throws IOException {
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final CloneableIterator<Row.Entry>[] c = new CloneableIterator[tables.size()];
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final Iterator<Index> i = tables.values().iterator();
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int d = 0;
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while (i.hasNext()) {
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c[d++] = i.next().rows();
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}
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return StackIterator.stack(c);
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}
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public synchronized void close() {
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if (tables == null) return;
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this.executor.shutdown();
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try {
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this.executor.awaitTermination(3, TimeUnit.SECONDS);
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} catch (final InterruptedException e) {
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}
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this.executor = null;
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final Iterator<Index> i = tables.values().iterator();
|
|
while (i.hasNext()) {
|
|
i.next().close();
|
|
}
|
|
this.tables = null;
|
|
}
|
|
|
|
public void deleteOnExit() {
|
|
for (Index i: this.tables.values()) i.deleteOnExit();
|
|
}
|
|
|
|
}
|