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*
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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.<p>
* Maintains a list of free file blocks with fixed capacity.<p>
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.0
* @since 2.3.0
*/
public class TableSpaceManagerBlocks implements TableSpaceManager {
DataSpaceManager spaceManager;
private final int scale;
int mainBlockSize;
int spaceID;
//
private DoubleIntIndex lookup;
private final int capacity;
private long releaseCount;
private long requestCount;
private long requestSize;
// reporting vars
boolean isModified;
//
long freshBlockFreePos = 0;
long freshBlockLimit = 0;
/**
*
*/
public TableSpaceManagerBlocks(DataSpaceManager spaceManager, int tableId,
int fileBlockSize, int capacity,
int fileScale) {
this.spaceManager = spaceManager;
this.scale = fileScale;
this.spaceID = tableId;
this.mainBlockSize = fileBlockSize;
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) {
this.freshBlockFreePos = blockFreePos;
this.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) {
freshBlockLimit += blockSize;
return true;
}
long released = freshBlockLimit - freshBlockFreePos;
if (released > 0) {
release(freshBlockFreePos / scale, (int) released);
}
freshBlockFreePos = position;
freshBlockLimit = position + 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) {
lookup.add(pos, rowSize);
}
}
/**
* Returns the position of a free block or 0.
*/
synchronized public long getFilePosition(long rowSize, boolean asBlocks) {
if (capacity == 0) {
return getNewBlock(rowSize, asBlocks);
}
if (asBlocks) {
rowSize = (int) ArrayUtil.getBinaryMultipleCeiling(rowSize,
DataSpaceManager.fixedBlockSizeUnit);
}
int index = -1;
if (lookup.size() > 0) {
if (lookup.getValue(0) >= rowSize) {
index = 0;
} else if (rowSize > Integer.MAX_VALUE) {
index = -1;
} else {
index = lookup.findFirstGreaterEqualKeyIndex((int) rowSize);
}
}
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 length = lookup.getValue(index);
int difference = length - (int) rowSize;
int key = lookup.getKey(index);
lookup.remove(index);
if (difference > 0) {
long pos = key + (rowSize / scale);
lookup.add(pos, difference);
}
return key;
}
public void reset() {
spaceManager.freeTableSpace(lookup, freshBlockFreePos,
freshBlockLimit, true);
freshBlockFreePos = 0;
freshBlockLimit = 0;
}
public long getLostBlocksSize() {
return lookup.getTotalValues();
}
public boolean isDefaultSpace() {
return spaceID == DataSpaceManager.tableIdDefault;
}
private void resetList() {
// dummy args for file block release
spaceManager.freeTableSpace(lookup, freshBlockFreePos,
freshBlockFreePos, false);
}
}