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644 lines
24 KiB
644 lines
24 KiB
// kelondroSplitTable.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: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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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 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.BlockingQueue;
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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.Semaphore;
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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.kelondro.blob.ArrayStack;
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import net.yacy.kelondro.index.Cache;
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import net.yacy.kelondro.index.Column;
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import net.yacy.kelondro.index.ObjectIndex;
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import net.yacy.kelondro.index.ObjectIndexCache;
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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.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.NaturalOrder;
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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.DateFormatter;
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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 ObjectIndex, 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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static final ObjectIndex dummyIndex = new ObjectIndexCache(new Row(new Column[]{new Column("key", Column.celltype_binary, Column.encoder_bytes, 2, "key")}, NaturalOrder.naturalOrder), 0, 0);
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// the thread pool for the keeperOf executor service
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private ExecutorService executor;
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private HashMap<String, ObjectIndex> 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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private BlockingQueue<DiscoverOrder> orderQueue;
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private Discovery[] discoveryThreads;
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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) {
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this(path, tablename, rowdef, ArrayStack.oneMonth, (long) Integer.MAX_VALUE, useTailCache, exceed134217727);
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}
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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 long fileAgeLimit,
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final long fileSizeLimit,
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final boolean useTailCache,
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final boolean exceed134217727) {
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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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this.orderQueue = new LinkedBlockingQueue<DiscoverOrder>();
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this.discoveryThreads = new Discovery[Runtime.getRuntime().availableProcessors() + 1];
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for (int i = 0; i < this.discoveryThreads.length; i++) {
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this.discoveryThreads[i] = new Discovery(this.orderQueue);
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this.discoveryThreads[i].start();
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}
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init();
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}
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String newFilename() {
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return prefix + "." + DateFormatter.formatShortMilliSecond(new Date()) + ".table";
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}
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public void init() {
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current = null;
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// initialized tables map
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this.tables = new HashMap<String, ObjectIndex>();
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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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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, sum = 0, 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 = DateFormatter.parseShortMilliSecond(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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maxtime = time;
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}
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try {
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ram = Table.staticRAMIndexNeed(f, rowdef);
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if (ram > 0) {
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t.put(tablefile[i], Long.valueOf(ram));
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sum += ram;
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}
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} catch (IOException e) {
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Log.logWarning("SplitTable", "file " + f.toString() + " appears to be corrupted: " + e.getMessage());
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}
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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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ObjectIndex table;
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while (t.size() > 0) {
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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 (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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if (maxf != null) {
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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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table = new Table(f, rowdef, EcoFSBufferSize, 0, this.useTailCache, this.exceed134217727);
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tables.put(maxf, table);
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}
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}
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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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init();
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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<ObjectIndex> 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 int writeBufferSize() {
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int s = 0;
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for (final ObjectIndex 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 synchronized boolean has(final byte[] key) {
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return keeperOf(key) != null;
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}
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public synchronized Row.Entry get(final byte[] key) throws IOException {
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final ObjectIndex 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 ObjectIndex 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 = new Table(f, rowdef, EcoFSBufferSize, 0, this.useTailCache, this.exceed134217727);
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tables.put(this.current, table);
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return table;
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}
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private ObjectIndex checkTable(ObjectIndex 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 = DateFormatter.parseShortMilliSecond(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 synchronized Row.Entry replace(final Row.Entry row) throws IOException {
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assert row.objectsize() <= this.rowdef.objectsize;
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ObjectIndex keeper = keeperOf(row.getColBytes(0));
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if (keeper != null) return keeper.replace(row);
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keeper = (this.current == null) ? newTable() : checkTable(this.tables.get(this.current));
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keeper.put(row);
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return null;
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}
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public synchronized void put(final Row.Entry row) throws IOException {
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assert row.objectsize() <= this.rowdef.objectsize;
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ObjectIndex keeper = keeperOf(row.getColBytes(0));
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if (keeper != null) {keeper.put(row); return;}
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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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keeper.put(row);
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}
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/**
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* challenge class for concurrent keeperOf implementation
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*
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*/
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private static final class Challenge {
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// the Challenge is a discover order entry
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private final byte[] key;
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private int responseCounter, finishCounter;
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private ObjectIndex discovery;
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private Semaphore readyCheck;
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public Challenge(final byte[] key, int finishCounter) {
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this.key = key;
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this.responseCounter = 0;
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this.finishCounter = finishCounter;
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this.readyCheck = new Semaphore(0);
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this.discovery = null;
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}
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public byte[] getKey() {
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return this.key;
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}
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public synchronized void commitNoDiscovery() {
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this.responseCounter++;
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if (this.responseCounter >= this.finishCounter) this.readyCheck.release();
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}
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public synchronized void commitDiscovery(ObjectIndex discovery) {
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this.responseCounter++;
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this.discovery = discovery;
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this.readyCheck.release();
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}
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public ObjectIndex discover(long timeout) {
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if (this.discovery != null) return this.discovery;
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try {
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this.readyCheck.tryAcquire(1, timeout, TimeUnit.MILLISECONDS);
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} catch (InterruptedException e) {}
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return this.discovery;
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}
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}
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/**
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* A DiscoverOrder is a class to order a check for a specific table
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* for the occurrences of a given key
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*
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*/
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private static final class DiscoverOrder {
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public Challenge challenge;
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public ObjectIndex objectIndex;
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public DiscoverOrder() {
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this.challenge = null;
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this.objectIndex = null;
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}
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public DiscoverOrder(Challenge challenge, ObjectIndex objectIndex) {
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this.challenge = challenge;
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this.objectIndex = objectIndex;
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}
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public void executeOrder() {
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try {
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if (this.objectIndex.has(this.challenge.getKey())) {
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this.challenge.commitDiscovery(this.objectIndex);
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} else {
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this.challenge.commitNoDiscovery();
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}
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} catch (Exception e) {
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Log.logSevere("SplitTable", "", e);
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this.challenge.commitNoDiscovery();
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}
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}
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}
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private static final DiscoverOrder poisonDiscoverOrder = new DiscoverOrder();
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/**
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* the Discovery class is used to start some concurrent threads that check the database
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* table files for occurrences of key after a keeperOf was submitted
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*
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*/
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private static final class Discovery extends Thread {
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// the class discovers keeper locations in the splitted table
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BlockingQueue<DiscoverOrder> orderQueue;
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public Discovery(BlockingQueue<DiscoverOrder> orderQueue) {
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super("SplitTable-Discovery");
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this.orderQueue = orderQueue;
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}
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public void run() {
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DiscoverOrder order;
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while (true) {
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try {
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order = orderQueue.take();
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} catch (InterruptedException e) {
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Log.logSevere("SplitTable", "", e);
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continue;
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}
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if (order == poisonDiscoverOrder) break;
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// check if in the given objectIndex is the key as given in the order
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order.executeOrder();
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}
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Log.logInfo("SplitTable.Discovery", "terminated discovery thread " + this.getName());
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}
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}
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private boolean discoveriesAlive() {
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for (int i = 0; i < this.discoveryThreads.length; i++) {
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if (!this.discoveryThreads[i].isAlive()) return false;
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}
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return true;
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}
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private ObjectIndex keeperOf(final byte[] key) {
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if (!discoveriesAlive()) {
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synchronized (tables) {
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for (ObjectIndex 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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}
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Challenge challenge = null;
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synchronized (tables) {
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int tableCount = this.tables.size();
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challenge = new Challenge(key, tableCount);
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// submit discover orders to the processing units
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final Iterator<ObjectIndex> i = tables.values().iterator();
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DiscoverOrder order;
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boolean offered;
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while (i.hasNext()) {
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order = new DiscoverOrder(challenge, i.next());
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offered = this.orderQueue.offer(order);
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if (!offered) {
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// for some reason the queue did not accept the order
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// so we execute the order here
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order.executeOrder();
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Log.logWarning("SplitTable", "executed a challenge order without concurrency. queue size = " + this.orderQueue.size());
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}
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}
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}
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// wait for a result
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ObjectIndex result = challenge.discover(1000);
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//System.out.println("result of discovery: file = " + ((result == null) ? "null" : result.filename()));
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return result;
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}
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/*
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private static final class ReadyCheck {
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private boolean r;
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public ReadyCheck() {
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this.r = false;
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}
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public void isReady() {
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this.r = true;
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}
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public boolean check() {
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return this.r;
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}
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}
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private ObjectIndex keeperOf(final byte[] key) {
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if (tables.size() < 2) {
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// no concurrency if not needed
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for (final ObjectIndex table : tables.values()) {
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if (table.has(key)) return table;
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}
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return null;
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}
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// because the index is stored only in one table,
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// and the index is completely in RAM, a concurrency will create
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// not concurrent File accesses
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// start a concurrent query to database tables
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final CompletionService<ObjectIndex> cs = new ExecutorCompletionService<ObjectIndex>(executor);
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int accepted = 0;
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final ReadyCheck ready = new ReadyCheck();
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for (final ObjectIndex table : tables.values()) {
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if (ready.check()) break; // found already a table
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try {
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cs.submit(new Callable<ObjectIndex>() {
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public ObjectIndex call() {
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if (table.has(key)) {
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ready.isReady();
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return table;
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}
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return dummyIndex;
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}
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});
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accepted++;
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} catch (final RejectedExecutionException e) {
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// the executor is either shutting down or the blocking queue is full
|
|
// execute the search direct here without concurrency
|
|
if (table.has(key)) return table;
|
|
}
|
|
}
|
|
|
|
// read the result
|
|
try {
|
|
for (int i = 0; i < accepted; i++) {
|
|
final Future<ObjectIndex> f = cs.take();
|
|
if (f == null) continue;
|
|
final ObjectIndex index = f.get();
|
|
if (index == dummyIndex) continue;
|
|
return index;
|
|
}
|
|
return null;
|
|
} catch (final InterruptedException e) {
|
|
Thread.currentThread().interrupt();
|
|
} catch (final ExecutionException e) {
|
|
Log.logSevere("SplitTable", "", e);
|
|
throw new RuntimeException(e.getCause());
|
|
}
|
|
return null;
|
|
}
|
|
*/
|
|
public synchronized void addUnique(final Row.Entry row) throws IOException {
|
|
assert row.objectsize() <= this.rowdef.objectsize;
|
|
ObjectIndex table = (this.current == null) ? null : tables.get(this.current);
|
|
if (table == null) table = newTable(); else table = checkTable(table);
|
|
table.addUnique(row);
|
|
}
|
|
|
|
public ArrayList<RowCollection> removeDoubles() throws IOException {
|
|
final Iterator<ObjectIndex> i = tables.values().iterator();
|
|
final ArrayList<RowCollection> report = new ArrayList<RowCollection>();
|
|
while (i.hasNext()) {
|
|
report.addAll(i.next().removeDoubles());
|
|
}
|
|
return report;
|
|
}
|
|
|
|
public synchronized Row.Entry remove(final byte[] key) throws IOException {
|
|
final ObjectIndex table = keeperOf(key);
|
|
if (table == null) return null;
|
|
return table.remove(key);
|
|
}
|
|
|
|
public synchronized Row.Entry removeOne() throws IOException {
|
|
final Iterator<ObjectIndex> i = tables.values().iterator();
|
|
ObjectIndex table, maxtable = null;
|
|
int maxcount = -1;
|
|
while (i.hasNext()) {
|
|
table = i.next();
|
|
if (table.size() > maxcount) {
|
|
maxtable = table;
|
|
maxcount = table.size();
|
|
}
|
|
}
|
|
if (maxtable == null) {
|
|
return null;
|
|
}
|
|
return maxtable.removeOne();
|
|
}
|
|
|
|
public synchronized CloneableIterator<byte[]> keys(final boolean up, final byte[] firstKey) throws IOException {
|
|
final List<CloneableIterator<byte[]>> c = new ArrayList<CloneableIterator<byte[]>>(tables.size());
|
|
final Iterator<ObjectIndex> i = tables.values().iterator();
|
|
CloneableIterator<byte[]> k;
|
|
while (i.hasNext()) {
|
|
k = i.next().keys(up, firstKey);
|
|
if (k != null) c.add(k);
|
|
}
|
|
return MergeIterator.cascade(c, rowdef.objectOrder, MergeIterator.simpleMerge, up);
|
|
}
|
|
|
|
public synchronized CloneableIterator<Row.Entry> rows(final boolean up, final byte[] firstKey) throws IOException {
|
|
final List<CloneableIterator<Row.Entry>> c = new ArrayList<CloneableIterator<Row.Entry>>(tables.size());
|
|
final Iterator<ObjectIndex> i = tables.values().iterator();
|
|
while (i.hasNext()) {
|
|
c.add(i.next().rows(up, firstKey));
|
|
}
|
|
return MergeIterator.cascade(c, entryOrder, MergeIterator.simpleMerge, up);
|
|
}
|
|
|
|
public Iterator<Entry> iterator() {
|
|
try {
|
|
return rows();
|
|
} catch (IOException e) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
public synchronized CloneableIterator<Row.Entry> rows() throws IOException {
|
|
final List<CloneableIterator<Row.Entry>> c = new ArrayList<CloneableIterator<Row.Entry>>(tables.size());
|
|
final Iterator<ObjectIndex> i = tables.values().iterator();
|
|
while (i.hasNext()) {
|
|
c.add(i.next().rows());
|
|
}
|
|
return StackIterator.stack(c);
|
|
}
|
|
|
|
public synchronized void close() {
|
|
// stop discover threads
|
|
if (this.orderQueue != null) for (int i = 0; i < this.discoveryThreads.length; i++) {
|
|
try {
|
|
this.orderQueue.put(poisonDiscoverOrder);
|
|
} catch (InterruptedException e) {
|
|
Log.logSevere("SplitTable", "", e);
|
|
}
|
|
}
|
|
|
|
if (tables == null) return;
|
|
this.executor.shutdown();
|
|
try {
|
|
this.executor.awaitTermination(3, TimeUnit.SECONDS);
|
|
} catch (final InterruptedException e) {
|
|
}
|
|
this.executor = null;
|
|
final Iterator<ObjectIndex> i = tables.values().iterator();
|
|
while (i.hasNext()) {
|
|
i.next().close();
|
|
}
|
|
this.tables = null;
|
|
}
|
|
|
|
public void deleteOnExit() {
|
|
for (ObjectIndex i: this.tables.values()) i.deleteOnExit();
|
|
}
|
|
|
|
}
|