org.hsqldb.persist.TableSpaceManagerBlocks Maven / Gradle / Ivy
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/* Copyright (c) 2001-2015, The HSQL Development Group
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package org.hsqldb.persist;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.lib.DoubleIntIndex;
/**
* Manages allocation of space for rows.
* Maintains a list of free file blocks with fixed capacity.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.3
* @since 2.3.0
*/
public class TableSpaceManagerBlocks implements TableSpaceManager {
DataSpaceManager spaceManager;
private final int scale;
final int mainBlockSize;
final int spaceID;
final int minReuse;
//
private DoubleIntIndex lookup;
private final int capacity;
private long requestGetCount;
private long releaseCount;
private long requestCount;
private long requestSize;
boolean isModified;
//
long freshBlockFreePos = 0;
long freshBlockLimit = 0;
int fileBlockIndex = -1;
/**
*
*/
public TableSpaceManagerBlocks(DataSpaceManager spaceManager, int tableId,
int fileBlockSize, int capacity,
int fileScale, int minReuse) {
this.spaceManager = spaceManager;
this.scale = fileScale;
this.spaceID = tableId;
this.mainBlockSize = fileBlockSize;
this.minReuse = minReuse;
lookup = new DoubleIntIndex(capacity, true);
lookup.setValuesSearchTarget();
this.capacity = capacity;
}
public boolean hasFileRoom(long blockSize) {
return freshBlockLimit - freshBlockFreePos > blockSize;
}
public void addFileBlock(long blockFreePos, long blockLimit) {
int released = (int) (freshBlockLimit - freshBlockFreePos);
if (released > 0) {
release(freshBlockFreePos / scale, released);
}
initialiseFileBlock(null, blockFreePos, blockLimit);
}
public void initialiseFileBlock(DoubleIntIndex spaceList,
long blockFreePos, long blockLimit) {
freshBlockFreePos = blockFreePos;
freshBlockLimit = blockLimit;
if (spaceList != null) {
spaceList.copyTo(lookup);
}
}
boolean getNewMainBlock(long rowSize) {
long blockCount = (mainBlockSize + rowSize) / mainBlockSize;
long blockSize = blockCount * mainBlockSize;
long position = spaceManager.getFileBlocks(spaceID, (int) blockCount);
if (position < 0) {
return false;
}
if (position != freshBlockLimit) {
long released = freshBlockLimit - freshBlockFreePos;
if (released > 0) {
release(freshBlockFreePos / scale, (int) released);
}
freshBlockFreePos = position;
freshBlockLimit = position;
}
freshBlockLimit += blockSize;
return true;
}
long getNewBlock(long rowSize, boolean asBlocks) {
if (asBlocks) {
rowSize = (int) ArrayUtil.getBinaryMultipleCeiling(rowSize,
DataSpaceManager.fixedBlockSizeUnit);
}
if (freshBlockFreePos + rowSize > freshBlockLimit) {
boolean result = getNewMainBlock(rowSize);
if (!result) {
throw Error.error(ErrorCode.DATA_FILE_IS_FULL);
}
}
long position = freshBlockFreePos;
if (asBlocks) {
position = ArrayUtil.getBinaryMultipleCeiling(position,
DataSpaceManager.fixedBlockSizeUnit);
long released = position - freshBlockFreePos;
if (released > 0) {
release(freshBlockFreePos / scale, (int) released);
freshBlockFreePos = position;
}
}
freshBlockFreePos += rowSize;
return position / scale;
}
public int getSpaceID() {
return spaceID;
}
synchronized public void release(long pos, int rowSize) {
isModified = true;
releaseCount++;
if (lookup.size() == capacity) {
resetList();
}
if (pos >= Integer.MAX_VALUE) {
return;
}
lookup.add(pos, rowSize / scale);
}
/**
* Returns the position of a free block or 0.
*/
synchronized public long getFilePosition(int rowSize, boolean asBlocks) {
requestGetCount++;
if (capacity == 0) {
return getNewBlock(rowSize, asBlocks);
}
if (asBlocks) {
rowSize = (int) ArrayUtil.getBinaryMultipleCeiling(rowSize,
DataSpaceManager.fixedBlockSizeUnit);
}
int index = -1;
int rowUnits = rowSize / scale;
if (rowSize >= minReuse && lookup.size() > 0) {
if (lookup.getValue(0) >= rowUnits) {
index = 0;
} else if (rowSize > Integer.MAX_VALUE) {
index = -1;
} else {
index = lookup.findFirstGreaterEqualKeyIndex(rowUnits);
}
}
if (index == -1) {
return getNewBlock(rowSize, asBlocks);
}
if (asBlocks) {
for (; index < lookup.size(); index++) {
long pos = lookup.getKey(index);
if (pos % (DataSpaceManager.fixedBlockSizeUnit / scale) == 0) {
break;
}
}
if (index == lookup.size()) {
return getNewBlock(rowSize, asBlocks);
}
}
// statistics for successful requests only - to be used later for midSize
requestCount++;
requestSize += rowSize;
int key = lookup.getKey(index);
int units = lookup.getValue(index);
int difference = units - rowUnits;
lookup.remove(index);
if (difference > 0) {
int pos = key + rowUnits;
lookup.add(pos, difference);
}
return key;
}
public void reset() {
if (freshBlockFreePos == 0) {
fileBlockIndex = -1;
} else {
fileBlockIndex = (int) (freshBlockFreePos / mainBlockSize);
}
spaceManager.freeTableSpace(spaceID, lookup, freshBlockFreePos,
freshBlockLimit, true);
freshBlockFreePos = 0;
freshBlockLimit = 0;
}
public long getLostBlocksSize() {
long total = freshBlockLimit - freshBlockFreePos
+ lookup.getTotalValues() * scale;
return total;
}
public boolean isDefaultSpace() {
return spaceID == DataSpaceManager.tableIdDefault;
}
public int getFileBlockIndex() {
return fileBlockIndex;
}
private void resetList() {
// dummy args for file block release
spaceManager.freeTableSpace(spaceID, lookup, 0, 0, false);
}
}