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316 lines
11 KiB
316 lines
11 KiB
// kelondroFlexSplitTable.java
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// (C) 2006 by Michael Peter Christen; mc@anomic.de, 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 de.anomic.kelondro;
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import java.io.File;
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import java.io.IOException;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.HashSet;
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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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public class kelondroFlexSplitTable implements kelondroIndex {
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// this is a set of kelondroFlex tables
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// the set is divided into FlexTables with different entry date
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private HashMap tables; // a map from a date string to a kelondroIndex object
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private kelondroRow rowdef;
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private File path;
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private String tablename;
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public kelondroFlexSplitTable(File path, String tablename, long preloadTime, kelondroRow rowdef) throws IOException {
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this.path = path;
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this.tablename = tablename;
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this.rowdef = rowdef;
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// initialized tables map
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this.tables = new HashMap();
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if (!(path.exists())) path.mkdirs();
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String[] dir = path.list();
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String date;
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// first pass: find tables
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HashMap t = new HashMap(); // file/Integer(size) relation
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long ram, sum = 0;
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for (int i = 0; i < dir.length; i++) {
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if ((dir[i].startsWith(tablename)) &&
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(dir[i].charAt(tablename.length()) == '.') &&
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(dir[i].length() == tablename.length() + 7)) {
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ram = kelondroFlexTable.staticRAMIndexNeed(path, dir[i], rowdef);
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if (ram > 0) {
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t.put(dir[i], new Long(ram));
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sum += ram;
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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 i;
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Map.Entry entry;
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String f, maxf;
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long maxram;
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kelondroIndex 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 = (Map.Entry) i.next();
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f = (String) entry.getKey();
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ram = ((Long) entry.getValue()).longValue();
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if (ram > maxram) {
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maxf = f;
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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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date = maxf.substring(tablename.length() + 1);
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table = new kelondroCache(new kelondroFlexTable(path, maxf, preloadTime, rowdef), true, false);
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tables.put(date, table);
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}
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}
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public String filename() {
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return new File(path, tablename).toString();
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}
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private static final Calendar thisCalendar = Calendar.getInstance();
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public static final String dateSuffix(Date date) {
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int month, year;
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StringBuffer suffix = new StringBuffer(6);
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synchronized (thisCalendar) {
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thisCalendar.setTime(date);
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month = thisCalendar.get(Calendar.MONTH) + 1;
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year = thisCalendar.get(Calendar.YEAR);
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}
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if ((year < 1970) && (year >= 70)) suffix.append("19").append(Integer.toString(year));
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else if (year < 1970) suffix.append("20").append(Integer.toString(year));
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else if (year > 3000) return null;
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else suffix.append(Integer.toString(year));
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if (month < 10) suffix.append("0").append(Integer.toString(month)); else suffix.append(Integer.toString(month));
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return new String(suffix);
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}
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public synchronized int size() throws IOException {
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Iterator i = tables.values().iterator();
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int s = 0;
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while (i.hasNext()) {
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s += ((kelondroIndex) i.next()).size();
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}
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return s;
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}
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public synchronized kelondroProfile profile() {
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kelondroProfile[] profiles = new kelondroProfile[tables.size()];
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Iterator i = tables.values().iterator();
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int c = 0;
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while (i.hasNext()) profiles[c++] = ((kelondroIndex) i.next()).profile();
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return kelondroProfile.consolidate(profiles);
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}
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public int writeBufferSize() {
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Iterator i = tables.values().iterator();
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int s = 0;
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kelondroIndex ki;
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while (i.hasNext()) {
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ki = ((kelondroIndex) i.next());
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if (ki instanceof kelondroCache) s += ((kelondroCache) ki).writeBufferSize();
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}
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return s;
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}
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public void flushSome() {
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Iterator i = tables.values().iterator();
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kelondroIndex ki;
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while (i.hasNext()) {
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ki = ((kelondroIndex) i.next());
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if (ki instanceof kelondroCache)
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try {((kelondroCache) ki).flushSome();} catch (IOException e) {}
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}
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}
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public kelondroRow row() throws IOException {
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return this.rowdef;
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}
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public boolean has(byte[] key) throws IOException {
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Iterator i = tables.values().iterator();
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kelondroIndex table;
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while (i.hasNext()) {
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table = (kelondroIndex) i.next();
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if (table.has(key)) return true;
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}
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return false;
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}
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public synchronized kelondroRow.Entry get(byte[] key) throws IOException {
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Object[] keeper = keeperOf(key);
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if (keeper == null) return null;
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return (kelondroRow.Entry) keeper[1];
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}
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public synchronized void putMultiple(List rows, Date entryDate) throws IOException {
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throw new UnsupportedOperationException("not yet implemented");
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}
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public synchronized kelondroRow.Entry put(kelondroRow.Entry row) throws IOException {
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return put(row, null); // entry for current date
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}
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public synchronized kelondroRow.Entry put(kelondroRow.Entry row, Date entryDate) throws IOException {
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assert row.bytes().length <= this.rowdef.objectsize;
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Object[] keeper = keeperOf(row.getColBytes(0));
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if (keeper != null) return ((kelondroIndex) keeper[0]).put(row);
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if ((entryDate == null) || (entryDate.after(new Date()))) entryDate = new Date(); // fix date
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String suffix = dateSuffix(entryDate);
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if (suffix == null) return null;
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kelondroIndex table = (kelondroIndex) tables.get(suffix);
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if (table == null) {
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// make new table
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table = new kelondroFlexTable(path, tablename + "." + suffix, -1, rowdef);
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tables.put(suffix, table);
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}
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table.put(row);
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return null;
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}
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public synchronized Object[] keeperOf(byte[] key) throws IOException {
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Iterator i = tables.values().iterator();
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kelondroIndex table;
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kelondroRow.Entry entry;
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while (i.hasNext()) {
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table = (kelondroIndex) i.next();
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entry = table.get(key);
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if (entry != null) return new Object[]{table, entry};
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}
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return null;
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}
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public synchronized void addUnique(kelondroRow.Entry row) throws IOException {
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addUnique(row, null);
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}
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public synchronized void addUnique(kelondroRow.Entry row, Date entryDate) throws IOException {
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assert row.bytes().length <= this.rowdef.objectsize;
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if ((entryDate == null) || (entryDate.after(new Date()))) entryDate = new Date(); // fix date
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String suffix = dateSuffix(entryDate);
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if (suffix == null) return;
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kelondroIndex table = (kelondroIndex) tables.get(suffix);
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if (table == null) {
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// make new table
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table = new kelondroFlexTable(path, tablename + "." + suffix, -1, rowdef);
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tables.put(suffix, table);
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}
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table.addUnique(row, entryDate);
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}
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public synchronized void addUniqueMultiple(List rows, Date entryDate) throws IOException {
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Iterator i = rows.iterator();
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while (i.hasNext()) addUnique((kelondroRow.Entry) i.next(), entryDate);
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}
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public synchronized kelondroRow.Entry remove(byte[] key) throws IOException {
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Iterator i = tables.values().iterator();
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kelondroIndex table;
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kelondroRow.Entry entry;
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while (i.hasNext()) {
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table = (kelondroIndex) i.next();
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entry = table.remove(key);
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if (entry != null) return entry;
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}
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return null;
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}
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public synchronized kelondroRow.Entry removeOne() throws IOException {
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Iterator i = tables.values().iterator();
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kelondroIndex table, maxtable = null;
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int maxcount = -1;
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while (i.hasNext()) {
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table = (kelondroIndex) 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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} else {
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return maxtable.removeOne();
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}
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}
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public synchronized kelondroCloneableIterator rows(boolean up, byte[] firstKey) throws IOException {
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HashSet set = new HashSet();
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Iterator i = tables.values().iterator();
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while (i.hasNext()) {
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set.add(((kelondroIndex) i.next()).rows(up, firstKey));
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}
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return kelondroMergeIterator.cascade(set, rowdef.objectOrder, kelondroMergeIterator.simpleMerge, up);
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}
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public final int cacheObjectChunkSize() {
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// dummy method
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return -1;
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}
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public long[] cacheObjectStatus() {
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// dummy method
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return null;
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}
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public final int cacheNodeChunkSize() {
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// returns the size that the node cache uses for a single entry
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return -1;
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}
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public final int[] cacheNodeStatus() {
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// a collection of different node cache status values
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return new int[]{0,0,0,0,0,0,0,0,0,0};
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}
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public synchronized void close() {
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if (tables == null) return;
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Iterator i = tables.values().iterator();
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while (i.hasNext()) {
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((kelondroIndex) i.next()).close();
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}
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tables = null;
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}
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public static void main(String[] args) {
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System.out.println(dateSuffix(new Date()));
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}
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}
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