// ArrayStack.java
// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 19.08.2008 on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate: 2011-06-01 21:31:56 +0200 (Mi, 01. Jun 2011) $
// $LastChangedRevision: 7766 $
// $LastChangedBy: orbiter $
//
// 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 net.yacy.kelondro.blob;
import java.io.File;
import java.io.IOException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.TreeMap;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import net.yacy.cora.date.GenericFormatter;
import net.yacy.cora.document.UTF8;
import net.yacy.kelondro.index.RowSpaceExceededException;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.order.ByteOrder;
import net.yacy.kelondro.order.CloneableIterator;
import net.yacy.kelondro.order.MergeIterator;
import net.yacy.kelondro.order.NaturalOrder;
import net.yacy.kelondro.rwi.Reference;
import net.yacy.kelondro.rwi.ReferenceContainer;
import net.yacy.kelondro.rwi.ReferenceFactory;
import net.yacy.kelondro.rwi.ReferenceIterator;
import net.yacy.kelondro.util.FileUtils;
import net.yacy.kelondro.util.LookAheadIterator;
import net.yacy.kelondro.util.NamePrefixThreadFactory;
public class ArrayStack implements BLOB {
/*
* This class implements a BLOB using a set of Heap objects
* In addition to a Heap this BLOB can delete large amounts of data using a given time limit.
* This is realized by creating separate BLOB files. New Files are created when either
* - a given time limit is reached
* - a given space limit is reached
* To organize such an array of BLOB files, the following file name structure is used:
* <BLOB-Name>/<YYYYMMDDhhmm>.blob
* That means all BLOB files are inside a directory that has the name of the BLOBArray.
* To delete content that is out-dated, one special method is implemented that deletes content by a given
* time-out. Deletions are not made automatically, they must be triggered using this method.
*/
public static final long maxFileSize = Integer.MAX_VALUE;
public static final long oneMonth = 1000L * 60L * 60L * 24L * 365L / 12L;
protected int keylength;
protected ByteOrder ordering;
private final File heapLocation;
private long fileAgeLimit;
private long fileSizeLimit;
private long repositoryAgeMax;
private long repositorySizeMax;
protected List<blobItem> blobs;
private final String prefix;
private final int buffersize;
private final boolean trimall;
// the thread pool for the keeperOf executor service
private final ExecutorService executor;
// use our own formatter to prevent concurrency locks with other processes
private final static GenericFormatter my_SHORT_MILSEC_FORMATTER = new GenericFormatter(GenericFormatter.FORMAT_SHORT_MILSEC, 1);
public ArrayStack(
final File heapLocation,
final String prefix,
final ByteOrder ordering,
final int keylength,
final int buffersize,
final boolean trimall) throws IOException {
this.keylength = keylength;
this.prefix = prefix;
this.ordering = ordering;
this.buffersize = buffersize;
this.heapLocation = heapLocation;
this.fileAgeLimit = oneMonth;
this.fileSizeLimit = maxFileSize;
this.repositoryAgeMax = Long.MAX_VALUE;
this.repositorySizeMax = Long.MAX_VALUE;
this.trimall = trimall;
// init the thread pool for the keeperOf executor service
this.executor = new ThreadPoolExecutor(
Runtime.getRuntime().availableProcessors() + 1,
Runtime.getRuntime().availableProcessors() * 4, 100,
TimeUnit.MILLISECONDS,
new LinkedBlockingQueue<Runnable>(),
new NamePrefixThreadFactory(prefix));
// check existence of the heap directory
if (heapLocation.exists()) {
if (!heapLocation.isDirectory()) throw new IOException("the BLOBArray directory " + heapLocation.toString() + " does not exist (is blocked by a file with same name)");
} else {
if(!heapLocation.mkdirs()) throw new IOException("the BLOBArray directory " + heapLocation.toString() + " does not exist (can not be created)");
}
// register all blob files inside this directory
String[] files = heapLocation.list();
HashSet<String> fh = new HashSet<String>();
for (int i = 0; i < files.length; i++) fh.add(files[i]);
// delete unused temporary files
boolean deletions = false;
for (int i = 0; i < files.length; i++) {
if (files[i].endsWith(".tmp") || files[i].endsWith(".prt")) {
FileUtils.deletedelete(new File(heapLocation, files[i]));
deletions = true;
}
if (files[i].endsWith(".idx") || files[i].endsWith(".gap")) {
String s = files[i].substring(0, files[i].length() - 17);
if (!fh.contains(s)) {
FileUtils.deletedelete(new File(heapLocation, files[i]));
deletions = true;
}
}
}
if (deletions) files = heapLocation.list(); // make a fresh list
// migrate old file names
Date d;
long time;
deletions = false;
for (int i = 0; i < files.length; i++) {
if (files[i].length() >= 19 && files[i].endsWith(".blob")) {
File f = new File(heapLocation, files[i]);
if (f.length() == 0) {
f.delete();
deletions = true;
} else try {
d = GenericFormatter.SHORT_SECOND_FORMATTER.parse(files[i].substring(0, 14));
f.renameTo(newBLOB(d));
deletions = true;
} catch (ParseException e) {continue;}
}
}
if (deletions) files = heapLocation.list(); // make a fresh list
// find maximum time: the file with this time will be given a write buffer
TreeMap<Long, blobItem> sortedItems = new TreeMap<Long, blobItem>();
BLOB oneBlob;
File f;
long maxtime = 0;
for (int i = 0; i < files.length; i++) {
if (files[i].length() >= 22 && files[i].startsWith(prefix) && files[i].endsWith(".blob")) {
try {
d = my_SHORT_MILSEC_FORMATTER.parse(files[i].substring(prefix.length() + 1, prefix.length() + 18));
time = d.getTime();
if (time > maxtime) maxtime = time;
} catch (ParseException e) {continue;}
}
}
// open all blob files
for (int i = 0; i < files.length; i++) {
if (files[i].length() >= 22 && files[i].startsWith(prefix) && files[i].endsWith(".blob")) {
try {
d = my_SHORT_MILSEC_FORMATTER.parse(files[i].substring(prefix.length() + 1, prefix.length() + 18));
f = new File(heapLocation, files[i]);
time = d.getTime();
if (time == maxtime && !trimall) {
oneBlob = new Heap(f, keylength, ordering, buffersize);
} else {
oneBlob = new HeapModifier(f, keylength, ordering);
oneBlob.trim(); // no writings here, can be used with minimum memory
}
sortedItems.put(Long.valueOf(time), new blobItem(d, f, oneBlob));
} catch (ParseException e) {continue;}
}
}
// read the blob tree in a sorted way and write them into an array
blobs = new CopyOnWriteArrayList<blobItem>();
for (blobItem bi : sortedItems.values()) {
blobs.add(bi);
}
}
public long mem() {
long m = 0;
if (this.blobs != null) for (blobItem b: this.blobs) m += b.blob.mem();
return m;
}
public void trim() {
// trim shall not be called for ArrayStacks because the characteristics of an ArrayStack is that the 'topmost' BLOB on the stack
// is used for write operations and all other shall be trimmed automatically since they are not used for writing. And the
// topmost BLOB must not be trimmed to support fast writings.
throw new UnsupportedOperationException();
}
/**
* add a blob file to the array.
* note that this file must be generated with a file name from newBLOB()
* @param location
* @throws IOException
*/
public synchronized void mountBLOB(File location, boolean full) throws IOException {
Date d;
try {
d = my_SHORT_MILSEC_FORMATTER.parse(location.getName().substring(prefix.length() + 1, prefix.length() + 18));
} catch (ParseException e) {
throw new IOException("date parse problem with file " + location.toString() + ": " + e.getMessage());
}
BLOB oneBlob;
if (full && buffersize > 0 && !trimall) {
oneBlob = new Heap(location, keylength, ordering, buffersize);
} else {
oneBlob = new HeapModifier(location, keylength, ordering);
oneBlob.trim();
}
blobs.add(new blobItem(d, location, oneBlob));
}
public synchronized void unmountBLOB(File location, boolean writeIDX) {
blobItem b;
for (int i = 0; i < this.blobs.size(); i++) {
b = this.blobs.get(i);
if (b.location.getAbsolutePath().equals(location.getAbsolutePath())) {
this.blobs.remove(i);
b.blob.close(writeIDX);
b.blob = null;
b.location = null;
return;
}
}
Log.logSevere("BLOBArray", "file " + location + " cannot be unmounted. The file " + ((location.exists()) ? "exists." : "does not exist."));
}
private File unmount(int idx) {
blobItem b = this.blobs.remove(idx);
b.blob.close(false);
b.blob = null;
File f = b.location;
b.location = null;
return f;
}
public synchronized File[] unmountBestMatch(float maxq, long maxResultSize) {
if (this.blobs.size() < 2) return null;
long l, r;
File lf, rf;
float min = Float.MAX_VALUE;
File[] bestMatch = new File[2];
maxResultSize = maxResultSize >> 1;
int loopcount = 0;
mainloop: for (int i = 0; i < this.blobs.size() - 1; i++) {
for (int j = i + 1; j < this.blobs.size(); j++) {
loopcount++;
lf = this.blobs.get(i).location;
rf = this.blobs.get(j).location;
l = 1 + (lf.length() >> 1);
r = 1 + (rf.length() >> 1);
if (l + r > maxResultSize) continue;
float q = Math.max((float) l, (float) r) / Math.min((float) l, (float) r);
if (q < min) {
min = q;
bestMatch[0] = lf;
bestMatch[1] = rf;
}
if (loopcount > 1000 && min <= maxq && min != Float.MAX_VALUE) break mainloop;
}
}
if (min > maxq) return null;
unmountBLOB(bestMatch[1], false);
unmountBLOB(bestMatch[0], false);
return bestMatch;
}
public synchronized File unmountOldest() {
if (this.blobs.size() == 0) return null;
if (System.currentTimeMillis() - this.blobs.get(0).creation.getTime() < this.fileAgeLimit) return null;
File f = this.blobs.get(0).location;
unmountBLOB(f, false);
return f;
}
public synchronized File[] unmountSmallest(long maxResultSize) {
if (this.blobs.size() < 2) return null;
File f0 = smallestBLOB(null, maxResultSize);
if (f0 == null) return null;
File f1 = smallestBLOB(f0, maxResultSize - f0.length());
if (f1 == null) return null;
unmountBLOB(f0, false);
unmountBLOB(f1, false);
return new File[]{f0, f1};
}
public synchronized File unmountSmallestBLOB(long maxResultSize) {
return smallestBLOB(null, maxResultSize);
}
public synchronized File smallestBLOB(File excluding, long maxsize) {
if (this.blobs.isEmpty()) return null;
File bestFile = null;
long smallest = Long.MAX_VALUE;
File f = null;
for (int i = 0; i < this.blobs.size(); i++) {
f = this.blobs.get(i).location;
if (excluding != null && f.getAbsolutePath().equals(excluding.getAbsolutePath())) continue;
if (f.length() < smallest) {
smallest = f.length();
bestFile = f;
}
if (i > 70 && smallest <= maxsize && smallest != Long.MAX_VALUE) break;
}
if (smallest > maxsize) return null;
return bestFile;
}
public synchronized File unmountOldestBLOB(boolean smallestFromFirst2) {
if (this.blobs.isEmpty()) return null;
int idx = 0;
if (smallestFromFirst2 && this.blobs.get(1).location.length() < this.blobs.get(0).location.length()) idx = 1;
return unmount(idx);
}
/**
* return the number of BLOB files in this array
* @return
*/
public synchronized int entries() {
return (this.blobs == null) ? 0 : this.blobs.size();
}
/**
* generate a new BLOB file name with a given date.
* This method is needed to generate a file name that matches to the name structure that is needed for parts of the array
* @param creation
* @return
*/
public synchronized File newBLOB(Date creation) {
//return new File(heapLocation, DateFormatter.formatShortSecond(creation) + "." + blobSalt + ".blob");
return new File(heapLocation, prefix + "." + my_SHORT_MILSEC_FORMATTER.format(creation) + ".blob");
}
public String name() {
return this.heapLocation.getName();
}
public void setMaxAge(long maxAge) {
this.repositoryAgeMax = maxAge;
this.fileAgeLimit = Math.min(oneMonth, maxAge / 10);
}
public void setMaxSize(long maxSize) {
this.repositorySizeMax = maxSize;
this.fileSizeLimit = Math.min(maxFileSize, maxSize / 100L);
executeLimits();
}
private void executeLimits() {
// check if storage limits are reached and execute consequences
if (blobs.isEmpty()) return;
// age limit:
while (!blobs.isEmpty() && System.currentTimeMillis() - blobs.get(0).creation.getTime() - this.fileAgeLimit > this.repositoryAgeMax) {
// too old
blobItem oldestBLOB = blobs.remove(0);
oldestBLOB.blob.close(false);
oldestBLOB.blob = null;
FileUtils.deletedelete(oldestBLOB.location);
}
// size limit
while (!blobs.isEmpty() && length() > this.repositorySizeMax) {
// too large
blobItem oldestBLOB = blobs.remove(0);
oldestBLOB.blob.close(false);
FileUtils.deletedelete(oldestBLOB.location);
}
}
/*
* return the size of the repository (in bytes)
*/
public synchronized long length() {
long s = 0;
for (int i = 0; i < blobs.size(); i++) s += blobs.get(i).location.length();
return s;
}
public ByteOrder ordering() {
return this.ordering;
}
private class blobItem {
Date creation;
File location;
BLOB blob;
public blobItem(Date creation, File location, BLOB blob) {
assert blob != null;
this.creation = creation;
this.location = location;
this.blob = blob;
}
public blobItem(int buffer) throws IOException {
// make a new blob file and assign it in this item
this.creation = new Date();
this.location = newBLOB(this.creation);
this.blob = (buffer == 0) ? new HeapModifier(location, keylength, ordering) : new Heap(location, keylength, ordering, buffer);
}
}
/**
* ask for the length of the primary key
* @return the length of the key
*/
public int keylength() {
return this.keylength;
}
/**
* clears the content of the database
* @throws IOException
*/
public synchronized void clear() throws IOException {
for (blobItem bi: blobs) {
bi.blob.clear();
bi.blob.close(false);
HeapWriter.delete(bi.location);
}
blobs.clear();
}
/**
* ask for the number of blob entries
* @return the number of entries in the table
*/
public synchronized int size() {
int s = 0;
for (blobItem bi: blobs) s += bi.blob.size();
return s;
}
public synchronized boolean isEmpty() {
for (blobItem bi: blobs) if (!bi.blob.isEmpty()) return false;
return true;
}
/**
* ask for the number of blob entries in each blob of the blob array
* @return the number of entries in each blob
*/
public synchronized int[] sizes() {
if (blobs == null) return new int[0];
int[] s = new int[blobs.size()];
int c = 0;
for (blobItem bi: blobs) s[c++] = bi.blob.size();
return s;
}
/**
* iterator over all keys
* @param up
* @param rotating
* @return
* @throws IOException
*/
public synchronized CloneableIterator<byte[]> keys(boolean up, boolean rotating) throws IOException {
assert rotating == false;
final List<CloneableIterator<byte[]>> c = new ArrayList<CloneableIterator<byte[]>>(blobs.size());
final Iterator<blobItem> i = blobs.iterator();
while (i.hasNext()) {
c.add(i.next().blob.keys(up, rotating));
}
return MergeIterator.cascade(c, this.ordering, MergeIterator.simpleMerge, up);
}
/**
* iterate over all keys
* @param up
* @param firstKey
* @return
* @throws IOException
*/
public synchronized CloneableIterator<byte[]> keys(boolean up, byte[] firstKey) throws IOException {
final List<CloneableIterator<byte[]>> c = new ArrayList<CloneableIterator<byte[]>>(blobs.size());
final Iterator<blobItem> i = blobs.iterator();
while (i.hasNext()) {
c.add(i.next().blob.keys(up, firstKey));
}
return MergeIterator.cascade(c, this.ordering, MergeIterator.simpleMerge, up);
}
/**
* check if a specific key is in the database
* @param key the primary key
* @return
* @throws IOException
*/
public synchronized boolean containsKey(byte[] key) {
blobItem bi = keeperOf(key);
return bi != null;
//for (blobItem bi: blobs) if (bi.blob.has(key)) return true;
//return false;
}
/**
* find the blobItem that holds the key
* if no blobItem is found, then return null
* @param key
* @return the blobItem that holds the key or null if no blobItem is found
*/
private blobItem keeperOf(final byte[] key) {
if (blobs.size() == 0) return null;
if (blobs.size() == 1) {
blobItem bi = blobs.get(0);
if (bi.blob.containsKey(key)) return bi;
return null;
}
// start a concurrent query to database tables
final CompletionService<blobItem> cs = new ExecutorCompletionService<blobItem>(executor);
int accepted = 0;
for (final blobItem bi : blobs) {
try {
cs.submit(new Callable<blobItem>() {
public blobItem call() {
if (bi.blob.containsKey(key)) return bi;
return null;
}
});
accepted++;
} catch (final RejectedExecutionException e) {
// the executor is either shutting down or the blocking queue is full
// execute the search direct here without concurrency
if (bi.blob.containsKey(key)) return bi;
}
}
// read the result
try {
for (int i = 0; i < accepted; i++) {
final Future<blobItem> f = cs.take();
//hash(System.out.println("**********accepted = " + accepted + ", i =" + i);
if (f == null) continue;
final blobItem index = f.get();
if (index != null) {
//System.out.println("*DEBUG SplitTable success.time = " + (System.currentTimeMillis() - start) + " ms");
return index;
}
}
//System.out.println("*DEBUG SplitTable fail.time = " + (System.currentTimeMillis() - start) + " ms");
return null;
} catch (final InterruptedException e) {
Thread.currentThread().interrupt();
} catch (final ExecutionException e) {
Log.logSevere("ArrayStack", "", e);
throw new RuntimeException(e.getCause());
}
//System.out.println("*DEBUG SplitTable fail.time = " + (System.currentTimeMillis() - start) + " ms");
return null;
}
/**
* retrieve the whole BLOB from the table
* @param key the primary key
* @return
* @throws IOException
*/
public byte[] get(byte[] key) throws IOException, RowSpaceExceededException {
if (blobs.size() == 0) return null;
if (blobs.size() == 1) {
blobItem bi = blobs.get(0);
return bi.blob.get(key);
}
blobItem bi = keeperOf(key);
return (bi == null) ? null : bi.blob.get(key);
/*
byte[] b;
for (blobItem bi: blobs) {
b = bi.blob.get(key);
if (b != null) return b;
}
return null;
*/
}
public byte[] get(Object key) {
if (!(key instanceof byte[])) return null;
try {
return get((byte[]) key);
} catch (IOException e) {
Log.logException(e);
} catch (RowSpaceExceededException e) {
Log.logException(e);
}
return null;
}
/**
* get all BLOBs in the array.
* this is useful when it is not clear if an entry is unique in all BLOBs in this array.
* @param key
* @return
* @throws IOException
*/
public Iterable<byte[]> getAll(byte[] key) throws IOException {
return new BlobValues(key);
}
public class BlobValues extends LookAheadIterator<byte[]> {
private final Iterator<blobItem> bii;
private final byte[] key;
public BlobValues(byte[] key) {
this.bii = blobs.iterator();
this.key = key;
}
protected byte[] next0() {
while (this.bii.hasNext()) {
BLOB b = this.bii.next().blob;
if (b == null) continue;
try {
byte[] n = b.get(key);
if (n != null) return n;
} catch (IOException e) {
Log.logSevere("ArrayStack", "", e);
return null;
} catch (RowSpaceExceededException e) {
continue;
}
}
return null;
}
}
/**
* retrieve the size of the BLOB
* @param key
* @return the size of the BLOB or -1 if the BLOB does not exist
* @throws IOException
*/
public synchronized long length(byte[] key) throws IOException {
long l;
for (blobItem bi: blobs) {
l = bi.blob.length(key);
if (l >= 0) return l;
}
return -1;
}
/**
* get all BLOBs in the array.
* this is useful when it is not clear if an entry is unique in all BLOBs in this array.
* @param key
* @return
* @throws IOException
*/
public Iterable<Long> lengthAll(byte[] key) throws IOException {
return new BlobLengths(key);
}
public class BlobLengths extends LookAheadIterator<Long> {
private final Iterator<blobItem> bii;
private final byte[] key;
public BlobLengths(byte[] key) {
this.bii = blobs.iterator();
this.key = key;
}
protected Long next0() {
while (this.bii.hasNext()) {
BLOB b = this.bii.next().blob;
if (b == null) continue;
try {
long l = b.length(key);
if (l >= 0) return Long.valueOf(l);
} catch (IOException e) {
Log.logSevere("ArrayStack", "", e);
return null;
}
}
return null;
}
}
/**
* retrieve the sizes of all BLOB
* @param key
* @return the size of the BLOB or -1 if the BLOB does not exist
* @throws IOException
*/
public synchronized long lengthAdd(byte[] key) throws IOException {
long l = 0;
for (blobItem bi: blobs) {
l += bi.blob.length(key);
}
return l;
}
/**
* write a whole byte array as BLOB to the table
* @param key the primary key
* @param b
* @throws IOException
* @throws RowSpaceExceededException
*/
public synchronized void insert(byte[] key, byte[] b) throws IOException {
blobItem bi = (blobs.isEmpty()) ? null : blobs.get(blobs.size() - 1);
/*
if (bi == null)
System.out.println("bi == null");
else if (System.currentTimeMillis() - bi.creation.getTime() > this.fileAgeLimit)
System.out.println("System.currentTimeMillis() - bi.creation.getTime() > this.maxage");
else if (bi.location.length() > this.fileSizeLimit)
System.out.println("bi.location.length() > this.maxsize");
*/
if ((bi == null) || (System.currentTimeMillis() - bi.creation.getTime() > this.fileAgeLimit) || (bi.location.length() > this.fileSizeLimit)) {
// add a new blob to the array
bi = new blobItem(buffersize);
blobs.add(bi);
}
assert bi.blob instanceof Heap;
bi.blob.insert(key, b);
executeLimits();
}
/**
* replace a BLOB entry with another
* @param key the primary key
* @throws IOException
* @throws RowSpaceExceededException
*/
public synchronized int replace(byte[] key, Rewriter rewriter) throws IOException, RowSpaceExceededException {
int d = 0;
for (blobItem bi: blobs) {
d += bi.blob.replace(key, rewriter);
}
return d;
}
/**
* replace a BLOB entry with another which must be smaller or same size
* @param key the primary key
* @throws IOException
* @throws RowSpaceExceededException
*/
public synchronized int reduce(byte[] key, Reducer reduce) throws IOException, RowSpaceExceededException {
int d = 0;
for (blobItem bi: blobs) {
d += bi.blob.reduce(key, reduce);
}
return d;
}
/**
* delete a BLOB
* @param key the primary key
* @throws IOException
*/
public synchronized void delete(final byte[] key) throws IOException {
long m = this.mem();
if (blobs.size() == 0) {
// do nothing
} else if (blobs.size() == 1) {
blobItem bi = blobs.get(0);
bi.blob.delete(key);
} else {
Thread[] t = new Thread[blobs.size() - 1];
int i = 0;
for (blobItem bi: blobs) {
if (i < t.length) {
// run this in a concurrent thread
final blobItem bi0 = bi;
t[i] = new Thread() {
public void run() {
try { bi0.blob.delete(key); } catch (IOException e) {}
}
};
t[i].start();
} else {
// no additional thread, run in this thread
try { bi.blob.delete(key); } catch (IOException e) {}
}
i++;
}
for (Thread s: t) try {s.join();} catch (InterruptedException e) {}
}
assert this.mem() <= m : "m = " + m + ", mem() = " + mem();
}
/**
* close the BLOB
*/
public synchronized void close(boolean writeIDX) {
for (blobItem bi: blobs) bi.blob.close(writeIDX);
blobs.clear();
blobs = null;
}
/**
* merge two blob files into one. If the second file is given as null,
* then the first file is only rewritten into a new one.
* @param f1
* @param f2 (may also be null)
* @param factory
* @param payloadrow
* @param newFile
* @param writeBuffer
* @return the target file where the given files are merged in
*/
public File mergeMount(File f1, File f2,
ReferenceFactory<? extends Reference> factory,
File newFile, int writeBuffer) {
if (f2 == null) {
// this is a rewrite
Log.logInfo("BLOBArray", "rewrite of " + f1.getName());
File resultFile = rewriteWorker(factory, this.keylength, this.ordering, f1, newFile, writeBuffer);
if (resultFile == null) {
Log.logWarning("BLOBArray", "rewrite of file " + f1 + " returned null. newFile = " + newFile);
return null;
}
try {
mountBLOB(resultFile, false);
} catch (IOException e) {
Log.logWarning("BLOBArray", "rewrite of file " + f1 + " successfull, but read failed. resultFile = " + resultFile);
return null;
}
Log.logInfo("BLOBArray", "rewrite of " + f1.getName() + " into " + resultFile);
return resultFile;
} else {
Log.logInfo("BLOBArray", "merging " + f1.getName() + " with " + f2.getName());
File resultFile = mergeWorker(factory, this.keylength, this.ordering, f1, f2, newFile, writeBuffer);
if (resultFile == null) {
Log.logWarning("BLOBArray", "merge of files " + f1 + ", " + f2 + " returned null. newFile = " + newFile);
return null;
}
try {
mountBLOB(resultFile, false);
} catch (IOException e) {
Log.logWarning("BLOBArray", "merge of files " + f1 + ", " + f2 + " successfull, but read failed. resultFile = " + resultFile);
return null;
}
Log.logInfo("BLOBArray", "merged " + f1.getName() + " with " + f2.getName() + " into " + resultFile);
return resultFile;
}
}
private static <ReferenceType extends Reference> File mergeWorker(
ReferenceFactory<ReferenceType> factory,
int keylength, ByteOrder order, File f1, File f2, File newFile, int writeBuffer) {
// iterate both files and write a new one
CloneableIterator<ReferenceContainer<ReferenceType>> i1 = null, i2 = null;
try {
i1 = new ReferenceIterator<ReferenceType>(f1, factory);
} catch (IOException e) {
Log.logSevere("ArrayStack", "cannot merge because input files cannot be read, f1 = " + f1.toString() + ": " + e.getMessage(), e);
return null;
}
try {
i2 = new ReferenceIterator<ReferenceType>(f2, factory);
} catch (IOException e) {
Log.logSevere("ArrayStack", "cannot merge because input files cannot be read, f2 = " + f2.toString() + ": " + e.getMessage(), e);
return null;
}
if (!i1.hasNext()) {
if (i2.hasNext()) {
HeapWriter.delete(f1);
if (f2.renameTo(newFile)) return newFile;
return f2;
}
HeapWriter.delete(f1);
HeapWriter.delete(f2);
return null;
} else if (!i2.hasNext()) {
HeapWriter.delete(f2);
if (f1.renameTo(newFile)) return newFile;
return f1;
}
assert i1.hasNext();
assert i2.hasNext();
File tmpFile = new File(newFile.getParentFile(), newFile.getName() + ".prt");
try {
HeapWriter writer = new HeapWriter(tmpFile, newFile, keylength, order, writeBuffer);
merge(i1, i2, order, writer);
writer.close(true);
} catch (IOException e) {
Log.logSevere("ArrayStack", "cannot writing or close writing merge, newFile = " + newFile.toString() + ", tmpFile = " + tmpFile.toString() + ": " + e.getMessage(), e);
HeapWriter.delete(tmpFile);
HeapWriter.delete(newFile);
return null;
} catch (RowSpaceExceededException e) {
Log.logSevere("ArrayStack", "cannot merge because of memory failure: " + e.getMessage(), e);
HeapWriter.delete(tmpFile);
HeapWriter.delete(newFile);
return null;
}
// we don't need the old files any more
HeapWriter.delete(f1);
HeapWriter.delete(f2);
return newFile;
}
private static <ReferenceType extends Reference> File rewriteWorker(
ReferenceFactory<ReferenceType> factory,
int keylength, ByteOrder order, File f, File newFile, int writeBuffer) {
// iterate both files and write a new one
CloneableIterator<ReferenceContainer<ReferenceType>> i = null;
try {
i = new ReferenceIterator<ReferenceType>(f, factory);
} catch (IOException e) {
Log.logSevere("ArrayStack", "cannot rewrite because input file cannot be read, f = " + f.toString() + ": " + e.getMessage(), e);
return null;
}
if (!i.hasNext()) {
FileUtils.deletedelete(f);
return null;
}
assert i.hasNext();
File tmpFile = new File(newFile.getParentFile(), newFile.getName() + ".prt");
try {
HeapWriter writer = new HeapWriter(tmpFile, newFile, keylength, order, writeBuffer);
rewrite(i, order, writer);
writer.close(true);
} catch (IOException e) {
Log.logSevere("ArrayStack", "cannot writing or close writing rewrite, newFile = " + newFile.toString() + ", tmpFile = " + tmpFile.toString() + ": " + e.getMessage(), e);
FileUtils.deletedelete(tmpFile);
FileUtils.deletedelete(newFile);
return null;
} catch (RowSpaceExceededException e) {
Log.logSevere("ArrayStack", "cannot rewrite because of memory failure: " + e.getMessage(), e);
FileUtils.deletedelete(tmpFile);
FileUtils.deletedelete(newFile);
return null;
}
// we don't need the old files any more
FileUtils.deletedelete(f);
return newFile;
}
private static <ReferenceType extends Reference> void merge(
CloneableIterator<ReferenceContainer<ReferenceType>> i1,
CloneableIterator<ReferenceContainer<ReferenceType>> i2,
ByteOrder ordering, HeapWriter writer) throws IOException, RowSpaceExceededException {
assert i1.hasNext();
assert i2.hasNext();
byte[] c1lh, c2lh;
ReferenceContainer<ReferenceType> c1, c2;
c1 = i1.next();
c2 = i2.next();
int e;
while (true) {
assert c1 != null;
assert c2 != null;
e = ordering.compare(c1.getTermHash(), c2.getTermHash());
if (e < 0) {
writer.add(c1.getTermHash(), c1.exportCollection());
if (i1.hasNext()) {
c1lh = c1.getTermHash();
c1 = i1.next();
assert ordering.compare(c1.getTermHash(), c1lh) > 0;
continue;
}
c1 = null;
break;
}
if (e > 0) {
writer.add(c2.getTermHash(), c2.exportCollection());
if (i2.hasNext()) {
c2lh = c2.getTermHash();
c2 = i2.next();
assert ordering.compare(c2.getTermHash(), c2lh) > 0;
continue;
}
c2 = null;
break;
}
assert e == 0;
// merge the entries
c1 = c1.merge(c2);
writer.add(c1.getTermHash(), c1.exportCollection());
c1lh = c1.getTermHash();
c2lh = c2.getTermHash();
if (i1.hasNext() && i2.hasNext()) {
c1 = i1.next();
assert ordering.compare(c1.getTermHash(), c1lh) > 0;
c2 = i2.next();
assert ordering.compare(c2.getTermHash(), c2lh) > 0;
continue;
}
c1 = null;
c2 = null;
if (i1.hasNext()) {
c1 = i1.next();
assert ordering.compare(c1.getTermHash(), c1lh) > 0;
}
if (i2.hasNext()) {
c2 = i2.next();
assert ordering.compare(c2.getTermHash(), c2lh) > 0;
}
break;
}
// catch up remaining entries
assert !(i1.hasNext() && i2.hasNext());
assert (c1 == null) || (c2 == null);
while (c1 != null) {
//System.out.println("FLUSH REMAINING 1: " + c1.getWordHash());
writer.add(c1.getTermHash(), c1.exportCollection());
if (i1.hasNext()) {
c1lh = c1.getTermHash();
c1 = i1.next();
assert ordering.compare(c1.getTermHash(), c1lh) > 0;
} else {
c1 = null;
}
}
while (c2 != null) {
//System.out.println("FLUSH REMAINING 2: " + c2.getWordHash());
writer.add(c2.getTermHash(), c2.exportCollection());
if (i2.hasNext()) {
c2lh = c2.getTermHash();
c2 = i2.next();
assert ordering.compare(c2.getTermHash(), c2lh) > 0;
} else {
c2 = null;
}
}
// finished with writing
}
private static <ReferenceType extends Reference> void rewrite(
CloneableIterator<ReferenceContainer<ReferenceType>> i,
ByteOrder ordering, HeapWriter writer) throws IOException, RowSpaceExceededException {
assert i.hasNext();
byte[] clh;
ReferenceContainer<ReferenceType> c;
c = i.next();
while (true) {
assert c != null;
writer.add(c.getTermHash(), c.exportCollection());
if (i.hasNext()) {
clh = c.getTermHash();
c = i.next();
assert ordering.compare(c.getTermHash(), clh) > 0;
continue;
}
break;
}
// finished with writing
}
public static void main(final String[] args) {
final File f = new File("/Users/admin/blobarraytest");
try {
//f.delete();
final ArrayStack heap = new ArrayStack(f, "test", NaturalOrder.naturalOrder, 12, 512 * 1024, false);
heap.insert("aaaaaaaaaaaa".getBytes(), "eins zwei drei".getBytes());
heap.insert("aaaaaaaaaaab".getBytes(), "vier fuenf sechs".getBytes());
heap.insert("aaaaaaaaaaac".getBytes(), "sieben acht neun".getBytes());
heap.insert("aaaaaaaaaaad".getBytes(), "zehn elf zwoelf".getBytes());
// iterate over keys
Iterator<byte[]> i = heap.keys(true, false);
while (i.hasNext()) {
System.out.println("key_b: " + UTF8.String(i.next()));
}
heap.delete("aaaaaaaaaaab".getBytes());
heap.delete("aaaaaaaaaaac".getBytes());
heap.insert("aaaaaaaaaaaX".getBytes(), "WXYZ".getBytes());
heap.close(true);
} catch (final IOException e) {
Log.logException(e);
}
}
}