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338 lines
15 KiB
338 lines
15 KiB
// plasmaDHTChunk.java
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// ------------------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2006
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// created: 18.02.2006
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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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// 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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma;
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import java.util.ArrayList;
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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 de.anomic.index.indexContainer;
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import de.anomic.index.indexRWIEntry;
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import de.anomic.index.indexURLEntry;
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import de.anomic.kelondro.kelondroBase64Order;
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import de.anomic.kelondro.kelondroException;
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import de.anomic.server.serverCodings;
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import de.anomic.server.logging.serverLog;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacyDHTAction;
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import de.anomic.yacy.yacySeedDB;
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public class plasmaDHTChunk {
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public static final int chunkStatus_UNDEFINED = -1;
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public static final int chunkStatus_FAILED = 0;
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public static final int chunkStatus_FILLED = 1;
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public static final int chunkStatus_RUNNING = 2;
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public static final int chunkStatus_INTERRUPTED = 3;
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public static final int chunkStatus_COMPLETE = 4;
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public static final int peerRedundancy = 3;
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private plasmaWordIndex wordIndex;
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private serverLog log;
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private int status = chunkStatus_UNDEFINED;
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private String startPointHash = "AAAAAAAAAAAA";
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private indexContainer[] indexContainers = null;
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private HashMap urlCache; // String (url-hash) / plasmaCrawlLURL.Entry
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private int idxCount;
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private long selectionStartTime = 0;
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private long selectionEndTime = 0;
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private int transferFailedCounter = 0;
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public indexContainer firstContainer() {
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return indexContainers[0];
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}
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public indexContainer lastContainer() {
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return indexContainers[indexContainers.length - 1];
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}
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public indexContainer[] containers() {
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return indexContainers;
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}
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public int containerSize() {
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return indexContainers.length;
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}
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public int indexCount() {
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return this.idxCount;
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}
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private int indexCounter() {
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int c = 0;
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for (int i = 0; i < indexContainers.length; i++) {
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c += indexContainers[i].size();
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}
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return c;
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}
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public HashMap urlCacheMap() {
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return urlCache;
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}
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public void setStatus(int newStatus) {
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this.status = newStatus;
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}
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public int getStatus() {
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return this.status;
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}
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public plasmaDHTChunk(serverLog log, plasmaWordIndex wordIndex, int minCount, int maxCount, int maxtime) {
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try {
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this.log = log;
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this.wordIndex = wordIndex;
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this.startPointHash = selectTransferStart();
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log.logFine("Selected hash " + this.startPointHash + " as start point for index distribution, distance = " + yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed().hash, this.startPointHash));
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selectTransferContainers(this.startPointHash, minCount, maxCount, maxtime);
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// count the indexes, can be smaller as expected
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this.idxCount = indexCounter();
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if (this.idxCount < minCount) {
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log.logFine("Too few (" + this.idxCount + ") indexes selected for transfer.");
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this.status = chunkStatus_FAILED;
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}
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} catch (InterruptedException e) {
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this.status = chunkStatus_INTERRUPTED;
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}
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}
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public plasmaDHTChunk(serverLog log, plasmaWordIndex wordIndex, int minCount, int maxCount, int maxtime, String startHash) {
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try {
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this.log = log;
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this.wordIndex = wordIndex;
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log.logFine("Demanded hash " + startHash + " as start point for index distribution, distance = " + yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed().hash, this.startPointHash));
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selectTransferContainers(startHash, minCount, maxCount, maxtime);
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// count the indexes, can be smaller as expected
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this.idxCount = indexCounter();
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if (this.idxCount < minCount) {
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log.logFine("Too few (" + this.idxCount + ") indexes selected for transfer.");
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this.status = chunkStatus_FAILED;
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}
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} catch (InterruptedException e) {
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this.status = chunkStatus_INTERRUPTED;
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}
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}
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private String selectTransferStart() {
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String startPointHash;
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// first try to select with increasing probality a good start point
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double minimumDistance = ((double) peerRedundancy) / ((double) yacyCore.seedDB.sizeConnected());
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double d, bestDistance = 0.0;
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String bestHash = null;
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for (int i = yacyCore.seedDB.sizeConnected() / 8; i > 0; i--) {
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startPointHash = kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(Long.toString(i + System.currentTimeMillis()))).substring(2, 2 + yacySeedDB.commonHashLength);
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d = yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed().hash, startPointHash);
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if (d > (minimumDistance + ((double) i / (double) 10))) {
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return startPointHash;
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}
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if (d > bestDistance) {
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bestDistance = d;
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bestHash = startPointHash;
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}
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}
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// if that fails, take simply the best start point
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if (bestHash == null) {
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return yacyCore.seedDB.mySeed().hash.substring(0, 11) + "z";
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} else {
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return bestHash;
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}
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}
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private void selectTransferContainers(String hash, int mincount, int maxcount, int maxtime) throws InterruptedException {
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try {
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this.selectionStartTime = System.currentTimeMillis();
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int refcountRAM = selectTransferContainersResource(hash, true, maxcount, maxtime);
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if (refcountRAM >= mincount) {
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log.logFine("DHT selection from RAM: " + refcountRAM + " entries");
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return;
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}
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int refcountFile = selectTransferContainersResource(hash, false, maxcount, maxtime);
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log.logFine("DHT selection from FILE: " + refcountFile + " entries, RAM provided only " + refcountRAM + " entries");
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return;
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} finally {
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this.selectionEndTime = System.currentTimeMillis();
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}
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}
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private int selectTransferContainersResource(String hash, boolean ram, int maxcount, int maxtime) throws InterruptedException {
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// if (maxcount > 500) { maxcount = 500; } // flooding & OOM reduce
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// the hash is a start hash from where the indexes are picked
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final ArrayList tmpContainers = new ArrayList(maxcount);
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try {
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final Iterator indexContainerIterator = wordIndex.indexContainerSet(hash, ram, true, maxcount).iterator();
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indexContainer container;
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Iterator urlIter;
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indexRWIEntry iEntry;
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indexURLEntry lurl;
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int refcount = 0;
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int wholesize;
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urlCache = new HashMap();
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final double maximumDistance = ((double) peerRedundancy * 2) / ((double) yacyCore.seedDB.sizeConnected());
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final long timeout = (maxtime < 0) ? Long.MAX_VALUE : System.currentTimeMillis() + maxtime;
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while (
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(maxcount > refcount) &&
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(indexContainerIterator.hasNext()) &&
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((container = (indexContainer) indexContainerIterator.next()) != null) &&
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(container.size() > 0) &&
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((tmpContainers.size() == 0) ||
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(yacyDHTAction.dhtDistance(container.getWordHash(), ((indexContainer) tmpContainers.get(0)).getWordHash()) < maximumDistance)) &&
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(System.currentTimeMillis() < timeout)
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) {
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// check for interruption
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if (Thread.currentThread().isInterrupted()) throw new InterruptedException("Shutdown in progress");
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// make an on-the-fly entity and insert values
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int notBoundCounter = 0;
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try {
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wholesize = container.size();
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urlIter = container.entries();
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// iterate over indexes to fetch url entries and store them in the urlCache
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while ((urlIter.hasNext()) && (maxcount > refcount) && (System.currentTimeMillis() < timeout)) {
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// CPU & IO reduce
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// try { Thread.sleep(50); } catch (InterruptedException e) { }
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iEntry = (indexRWIEntry) urlIter.next();
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if ((iEntry == null) || (iEntry.urlHash() == null)) {
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urlIter.remove();
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continue;
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}
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lurl = wordIndex.loadedURL.load(iEntry.urlHash(), iEntry, 0);
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if ((lurl == null) || (lurl.comp() == null) || (lurl.comp().url() == null)) {
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//yacyCore.log.logFine("DEBUG selectTransferContainersResource: not-bound url hash '" + iEntry.urlHash() + "' for word hash " + container.getWordHash());
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notBoundCounter++;
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urlIter.remove();
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wordIndex.removeEntry(container.getWordHash(), iEntry.urlHash());
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} else {
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urlCache.put(iEntry.urlHash(), lurl);
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//yacyCore.log.logFine("DEBUG selectTransferContainersResource: added url hash '" + iEntry.urlHash() + "' to urlCache for word hash " + container.getWordHash());
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refcount++;
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}
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}
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// remove all remaining; we have enough
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while (urlIter.hasNext()) {
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iEntry = (indexRWIEntry) urlIter.next();
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urlIter.remove();
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}
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// use whats left
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log.logFine("Selected partial index (" + container.size() + " from " + wholesize + " URLs, " + notBoundCounter + " not bound) for word " + container.getWordHash());
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tmpContainers.add(container);
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} catch (kelondroException e) {
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log.logSevere("plasmaWordIndexDistribution/2: deleted DB for word " + container.getWordHash(), e);
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wordIndex.deleteContainer(container.getWordHash());
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}
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}
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// create result
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indexContainers = (indexContainer[]) tmpContainers.toArray(new indexContainer[tmpContainers.size()]);
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//[C[16GwGuFzwffp] has 1 entries, C[16hGKMAl0w97] has 9 entries, C[17A8cDPF6SfG] has 9 entries, C[17Kdj__WWnUy] has 1 entries, C[1
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if ((indexContainers == null) || (indexContainers.length == 0)) {
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log.logFine("No index available for index transfer, hash start-point " + startPointHash);
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this.status = chunkStatus_FAILED;
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return 0;
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}
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this.status = chunkStatus_FILLED;
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return refcount;
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} catch (kelondroException e) {
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log.logSevere("selectTransferIndexes database corrupted: " + e.getMessage(), e);
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indexContainers = new indexContainer[0];
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urlCache = new HashMap();
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this.status = chunkStatus_FAILED;
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return 0;
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}
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}
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public synchronized String deleteTransferIndexes() {
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Iterator urlIter;
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indexRWIEntry iEntry;
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HashSet urlHashes;
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String count = "0";
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for (int i = 0; i < this.indexContainers.length; i++) {
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// delete entries separately
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if (this.indexContainers[i] == null) {
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log.logFine("Deletion of partial index #" + i + " not possible, entry is null");
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continue;
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}
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int c = this.indexContainers[i].size();
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urlHashes = new HashSet(this.indexContainers[i].size());
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urlIter = this.indexContainers[i].entries();
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while (urlIter.hasNext()) {
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iEntry = (indexRWIEntry) urlIter.next();
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urlHashes.add(iEntry.urlHash());
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}
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String wordHash = indexContainers[i].getWordHash();
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count = wordIndex.removeEntriesExpl(this.indexContainers[i].getWordHash(), urlHashes);
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if (log.isFine())
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log.logFine("Deleted partial index (" + c + " URLs) for word " + wordHash + "; " + this.wordIndex.indexSize(wordHash) + " entries left");
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this.indexContainers[i] = null;
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}
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return count;
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}
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public long getSelectionTime() {
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if (this.selectionStartTime == 0 || this.selectionEndTime == 0) return -1;
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return this.selectionEndTime-this.selectionStartTime;
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}
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public void incTransferFailedCounter() {
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this.transferFailedCounter++;
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}
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public int getTransferFailedCounter() {
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return transferFailedCounter;
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}
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}
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