You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
344 lines
13 KiB
344 lines
13 KiB
// ReverseIndexCell.java
|
|
// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
|
// first published 1.3.2009 on http://yacy.net
|
|
//
|
|
// This is a part of YaCy, a peer-to-peer based web search engine
|
|
//
|
|
// $LastChangedDate$
|
|
// $LastChangedRevision$
|
|
// $LastChangedBy$
|
|
//
|
|
// LICENSE
|
|
//
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
package de.anomic.kelondro.text;
|
|
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.util.HashSet;
|
|
import java.util.Set;
|
|
|
|
import de.anomic.kelondro.index.Row;
|
|
import de.anomic.kelondro.order.ByteOrder;
|
|
import de.anomic.kelondro.order.CloneableIterator;
|
|
import de.anomic.kelondro.order.MergeIterator;
|
|
import de.anomic.kelondro.order.Order;
|
|
import de.anomic.kelondro.util.MemoryControl;
|
|
import de.anomic.server.serverProfiling;
|
|
|
|
/*
|
|
* an index cell is a part of the horizontal index in the new segment-oriented index
|
|
* data structure of YaCy. If there is no filter in front of a cell, it might also be
|
|
* the organization for a complete segment index. Each cell consists of a number of BLOB files, that
|
|
* must be merged to represent a single index. In fact these index files are only merged on demand
|
|
* if there are too many of them. An index merge can be done with a stream read and stream write operation.
|
|
* in normal operation, there are only a number of read-only BLOB files and a single RAM cache that is
|
|
* kept in the RAM as long as a given limit of entries is reached. Then the cache is flushed and becomes
|
|
* another BLOB file in the index array.
|
|
*/
|
|
|
|
public final class IndexCell<ReferenceType extends Reference> extends AbstractBufferedIndex<ReferenceType> implements BufferedIndex<ReferenceType> {
|
|
|
|
private static final long cleanupCycle = 10000;
|
|
|
|
// class variables
|
|
private final ReferenceContainerArray<ReferenceType> array;
|
|
private ReferenceContainerCache<ReferenceType> ram;
|
|
private int maxRamEntries;
|
|
private final IODispatcher<ReferenceType> merger;
|
|
private long lastCleanup;
|
|
private final long targetFileSize, maxFileSize;
|
|
|
|
|
|
public IndexCell(
|
|
final File cellPath,
|
|
final ReferenceFactory<ReferenceType> factory,
|
|
final ByteOrder termOrder,
|
|
final Row payloadrow,
|
|
final int maxRamEntries,
|
|
final long targetFileSize,
|
|
final long maxFileSize,
|
|
IODispatcher<ReferenceType> merger
|
|
) throws IOException {
|
|
super(factory);
|
|
|
|
this.array = new ReferenceContainerArray<ReferenceType>(cellPath, factory, termOrder, payloadrow, merger);
|
|
this.ram = new ReferenceContainerCache<ReferenceType>(factory, payloadrow, termOrder);
|
|
this.ram.initWriteMode();
|
|
this.maxRamEntries = maxRamEntries;
|
|
this.merger = merger;
|
|
this.lastCleanup = System.currentTimeMillis();
|
|
this.targetFileSize = targetFileSize;
|
|
this.maxFileSize = maxFileSize;
|
|
cleanCache();
|
|
}
|
|
|
|
|
|
/*
|
|
* methods to implement Index
|
|
*/
|
|
|
|
/**
|
|
* add entries to the cell: this adds the new entries always to the RAM part, never to BLOBs
|
|
* @throws IOException
|
|
* @throws IOException
|
|
*/
|
|
public synchronized void add(ReferenceContainer<ReferenceType> newEntries) throws IOException {
|
|
this.ram.add(newEntries);
|
|
serverProfiling.update("wordcache", Long.valueOf(this.ram.size()), true);
|
|
cleanCache();
|
|
}
|
|
|
|
public synchronized void add(String hash, ReferenceType entry) throws IOException {
|
|
this.ram.add(hash, entry);
|
|
serverProfiling.update("wordcache", Long.valueOf(this.ram.size()), true);
|
|
cleanCache();
|
|
}
|
|
|
|
/**
|
|
* checks if there is any container for this termHash, either in RAM or any BLOB
|
|
*/
|
|
public boolean has(String termHash) {
|
|
if (this.ram.has(termHash)) return true;
|
|
return this.array.has(termHash);
|
|
}
|
|
|
|
public int count(String termHash) {
|
|
ReferenceContainer<ReferenceType> c0 = this.ram.get(termHash, null);
|
|
ReferenceContainer<ReferenceType> c1;
|
|
try {
|
|
c1 = this.array.get(termHash);
|
|
} catch (IOException e) {
|
|
c1 = null;
|
|
}
|
|
if (c1 == null) {
|
|
if (c0 == null) return 0;
|
|
return c0.size();
|
|
}
|
|
if (c0 == null) return c1.size();
|
|
return c1.size() + c0.size();
|
|
}
|
|
|
|
/**
|
|
* all containers in the BLOBs and the RAM are merged and returned
|
|
* @throws IOException
|
|
*/
|
|
public ReferenceContainer<ReferenceType> get(String termHash, Set<String> urlselection) throws IOException {
|
|
ReferenceContainer<ReferenceType> c0 = this.ram.get(termHash, null);
|
|
ReferenceContainer<ReferenceType> c1 = this.array.get(termHash);
|
|
if (c1 == null) {
|
|
if (c0 == null) return null;
|
|
return c0;
|
|
}
|
|
if (c0 == null) return c1;
|
|
return c1.merge(c0);
|
|
}
|
|
|
|
/**
|
|
* deleting a container affects the containers in RAM and all the BLOB files
|
|
* the deleted containers are merged and returned as result of the method
|
|
* @throws IOException
|
|
*/
|
|
public ReferenceContainer<ReferenceType> delete(String termHash) throws IOException {
|
|
ReferenceContainer<ReferenceType> c0 = this.ram.delete(termHash);
|
|
ReferenceContainer<ReferenceType> c1 = this.array.get(termHash);
|
|
if (c1 == null) {
|
|
if (c0 == null) return null;
|
|
return c0;
|
|
}
|
|
this.array.delete(termHash);
|
|
cleanCache();
|
|
if (c0 == null) return c1;
|
|
return c1.merge(c0);
|
|
}
|
|
|
|
/**
|
|
* remove url references from a selected word hash. this deletes also in the BLOB
|
|
* files, which means that there exists new gap entries after the deletion
|
|
* The gaps are never merged in place, but can be eliminated when BLOBs are merged into
|
|
* new BLOBs. This returns the sum of all url references that have been removed
|
|
* @throws IOException
|
|
*/
|
|
public int remove(String termHash, Set<String> urlHashes) throws IOException {
|
|
int reduced = this.array.replace(termHash, new RemoveRewriter<ReferenceType>(urlHashes));
|
|
return reduced / this.array.rowdef().objectsize;
|
|
}
|
|
|
|
public boolean remove(String termHash, String urlHash) throws IOException {
|
|
int reduced = this.array.replace(termHash, new RemoveRewriter<ReferenceType>(urlHash));
|
|
return reduced > 0;
|
|
}
|
|
|
|
private static class RemoveRewriter<RT extends Reference> implements ReferenceContainerArray.ContainerRewriter<RT> {
|
|
|
|
Set<String> urlHashes;
|
|
|
|
public RemoveRewriter(Set<String> urlHashes) {
|
|
this.urlHashes = urlHashes;
|
|
}
|
|
|
|
public RemoveRewriter(String urlHash) {
|
|
this.urlHashes = new HashSet<String>();
|
|
this.urlHashes.add(urlHash);
|
|
}
|
|
|
|
public ReferenceContainer<RT> rewrite(ReferenceContainer<RT> container) {
|
|
container.removeEntries(urlHashes);
|
|
return container;
|
|
}
|
|
|
|
}
|
|
|
|
public CloneableIterator<ReferenceContainer<ReferenceType>> references(String starttermHash, boolean rot) {
|
|
final Order<ReferenceContainer<ReferenceType>> containerOrder = new ReferenceContainerOrder<ReferenceType>(factory, this.ram.rowdef().getOrdering().clone());
|
|
containerOrder.rotate(new ReferenceContainer<ReferenceType>(factory, starttermHash, this.ram.rowdef(), 0));
|
|
return new MergeIterator<ReferenceContainer<ReferenceType>>(
|
|
this.ram.references(starttermHash, rot),
|
|
new MergeIterator<ReferenceContainer<ReferenceType>>(
|
|
this.ram.references(starttermHash, false),
|
|
this.array.wordContainerIterator(starttermHash, false, false),
|
|
containerOrder,
|
|
ReferenceContainer.containerMergeMethod,
|
|
true),
|
|
containerOrder,
|
|
ReferenceContainer.containerMergeMethod,
|
|
true);
|
|
}
|
|
|
|
public CloneableIterator<ReferenceContainer<ReferenceType>> references(String startTermHash, boolean rot, boolean ram) {
|
|
final Order<ReferenceContainer<ReferenceType>> containerOrder = new ReferenceContainerOrder<ReferenceType>(factory, this.ram.rowdef().getOrdering().clone());
|
|
containerOrder.rotate(new ReferenceContainer<ReferenceType>(factory, startTermHash, this.ram.rowdef(), 0));
|
|
if (ram) {
|
|
return this.ram.references(startTermHash, rot);
|
|
}
|
|
return new MergeIterator<ReferenceContainer<ReferenceType>>(
|
|
this.ram.references(startTermHash, false),
|
|
this.array.wordContainerIterator(startTermHash, false, false),
|
|
containerOrder,
|
|
ReferenceContainer.containerMergeMethod,
|
|
true);
|
|
}
|
|
|
|
/**
|
|
* clear the RAM and BLOB part, deletes everything in the cell
|
|
* @throws IOException
|
|
*/
|
|
public synchronized void clear() throws IOException {
|
|
this.ram.clear();
|
|
this.array.clear();
|
|
}
|
|
|
|
/**
|
|
* when a cell is closed, the current RAM is dumped to a file which will be opened as
|
|
* BLOB file the next time a cell is opened. A name for the dump is automatically generated
|
|
* and is composed of the current date and the cell salt
|
|
*/
|
|
public synchronized void close() {
|
|
this.ram.dump(this.array.newContainerBLOBFile(), true);
|
|
// close all
|
|
this.ram.close();
|
|
this.array.close();
|
|
}
|
|
|
|
public int size() {
|
|
return this.ram.size() + this.array.size();
|
|
}
|
|
|
|
public int minMem() {
|
|
return 10 * 1024 * 1024;
|
|
}
|
|
|
|
public ByteOrder ordering() {
|
|
return this.array.ordering();
|
|
}
|
|
|
|
|
|
/*
|
|
* cache control methods
|
|
*/
|
|
|
|
private synchronized void cleanCache() {
|
|
// dump the cache if necessary
|
|
if (this.ram.size() > this.maxRamEntries || (this.ram.size() > 2000 && !MemoryControl.request(100L * 1024L * 1024L, false))) {
|
|
try {
|
|
cacheDump();
|
|
} catch (IOException e) {
|
|
e.printStackTrace();
|
|
}
|
|
}
|
|
|
|
// clean-up the cache
|
|
if (this.array.size() < 50 && this.lastCleanup + cleanupCycle > System.currentTimeMillis()) return;
|
|
//System.out.println("----cleanup check");
|
|
this.array.shrink(this.targetFileSize, this.maxFileSize);
|
|
this.lastCleanup = System.currentTimeMillis();
|
|
}
|
|
|
|
private synchronized void cacheDump() throws IOException {
|
|
// dump the ram
|
|
File dumpFile = this.array.newContainerBLOBFile();
|
|
//this.ram.dump(dumpFile, true);
|
|
//this.array.mountBLOBContainer(dumpFile);
|
|
merger.dump(this.ram, dumpFile, array);
|
|
// get a fresh ram cache
|
|
this.ram = new ReferenceContainerCache<ReferenceType>(factory, this.array.rowdef(), this.array.ordering());
|
|
this.ram.initWriteMode();
|
|
}
|
|
|
|
public File newContainerBLOBFile() {
|
|
// for migration of cache files
|
|
return this.array.newContainerBLOBFile();
|
|
}
|
|
|
|
public void mountBLOBFile(File blobFile) throws IOException {
|
|
// for migration of cache files
|
|
this.array.mountBLOBFile(blobFile);
|
|
}
|
|
|
|
public void cleanupBuffer(int time) {
|
|
// do nothing
|
|
}
|
|
|
|
public int getBackendSize() {
|
|
return this.array.size();
|
|
}
|
|
|
|
public long getBufferMaxAge() {
|
|
return System.currentTimeMillis();
|
|
}
|
|
|
|
public int getBufferMaxReferences() {
|
|
return this.ram.maxReferences();
|
|
}
|
|
|
|
public long getBufferMinAge() {
|
|
return System.currentTimeMillis();
|
|
}
|
|
|
|
public int getBufferSize() {
|
|
return this.ram.size();
|
|
}
|
|
|
|
public long getBufferSizeBytes() {
|
|
return 10000 * this.ram.size(); // guessed; we don't know that exactly because there is no statistics here (expensive, not necessary)
|
|
}
|
|
|
|
public void setBufferMaxWordCount(int maxWords) {
|
|
this.maxRamEntries = maxWords;
|
|
}
|
|
|
|
}
|