/** Read the page from the disk. */
private void read() {
data.reset();
data.readByte();
data.readShortInt();
trunk = data.readInt();
logKey = data.readInt();
}
/**
* Get the next row from the list.
*
* @return the next row
*/
public Row next() {
Row r;
if (file == null) {
r = list.get(index++);
} else {
if (listIndex >= list.size()) {
list.clear();
listIndex = 0;
Data buff = rowBuff;
buff.reset();
int min = Constants.FILE_BLOCK_SIZE;
file.readFully(buff.getBytes(), 0, min);
int len = buff.readInt() * Constants.FILE_BLOCK_SIZE;
buff.checkCapacity(len);
if (len - min > 0) {
file.readFully(buff.getBytes(), min, len - min);
}
while (true) {
r = readRow(buff);
if (r == null) {
break;
}
list.add(r);
}
}
index++;
r = list.get(listIndex++);
}
return r;
}
/** Read the page from the disk. */
private void read() {
data.reset();
data.readByte();
data.readShortInt();
for (int i = 0; i < pageCount; i += 8) {
int x = data.readByte() & 255;
used.setByte(i, x);
}
full = false;
}
/**
* Copy a String from a reader to an output stream.
*
* @param source the reader
* @param target the output stream
*/
public static void copyString(Reader source, OutputStream target) throws IOException {
char[] buff = new char[Constants.IO_BUFFER_SIZE];
Data d = new Data(null, new byte[3 * Constants.IO_BUFFER_SIZE]);
while (true) {
int l = source.read(buff);
if (l < 0) {
break;
}
d.writeStringWithoutLength(buff, l);
target.write(d.data, 0, d.pos);
d.reset();
}
}
/**
* Read a row from an input stream.
*
* @param in the input stream
* @param data a temporary buffer
* @return the row
*/
public static Row readRow(DataReader in, Data data) throws IOException {
long key = in.readVarLong();
int len = in.readVarInt();
data.reset();
data.checkCapacity(len);
in.readFully(data.getBytes(), len);
int columnCount = data.readVarInt();
Value[] values = new Value[columnCount];
for (int i = 0; i < columnCount; i++) {
values[i] = data.readValue();
}
Row row = new Row(values, Row.MEMORY_CALCULATE);
row.setKey(key);
return row;
}
@Override
public int addRows(ArrayList<Value[]> rows) {
if (sort != null) {
sort.sort(rows);
}
Data buff = rowBuff;
long start = file.getFilePointer();
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int bufferLen = 0;
for (Value[] row : rows) {
buff.reset();
buff.writeInt(0);
for (int j = 0; j < columnCount; j++) {
Value v = row[j];
buff.checkCapacity(buff.getValueLen(v));
buff.writeValue(v);
}
buff.fillAligned();
int len = buff.length();
buff.setInt(0, len);
if (maxBufferSize > 0) {
buffer.write(buff.getBytes(), 0, len);
bufferLen += len;
if (bufferLen > maxBufferSize) {
byte[] data = buffer.toByteArray();
buffer.reset();
file.write(data, 0, data.length);
bufferLen = 0;
}
} else {
file.write(buff.getBytes(), 0, len);
}
}
if (bufferLen > 0) {
byte[] data = buffer.toByteArray();
file.write(data, 0, data.length);
}
if (sort != null) {
ResultDiskTape tape = new ResultDiskTape();
tape.start = start;
tape.end = file.getFilePointer();
tapes.add(tape);
} else {
mainTape.end = file.getFilePointer();
}
rowCount += rows.size();
return rowCount;
}
private void readRow(ResultDiskTape tape) {
int min = Constants.FILE_BLOCK_SIZE;
Data buff = rowBuff;
buff.reset();
file.readFully(buff.getBytes(), 0, min);
int len = buff.readInt();
buff.checkCapacity(len);
if (len - min > 0) {
file.readFully(buff.getBytes(), min, len - min);
}
tape.pos += len;
Value[] row = new Value[columnCount];
for (int k = 0; k < columnCount; k++) {
row[k] = buff.readValue();
}
tape.buffer.add(row);
}
/**
* A record is added to a table, or removed from a table.
*
* @param session the session
* @param tableId the table id
* @param row the row to add
* @param add true if the row is added, false if it is removed
*/
void logAddOrRemoveRow(Session session, int tableId, Row row, boolean add) {
if (trace.isDebugEnabled()) {
trace.debug(
"log "
+ (add ? "+" : "-")
+ " s: "
+ session.getId()
+ " table: "
+ tableId
+ " row: "
+ row);
}
session.addLogPos(logSectionId, logPos);
logPos++;
Data data = dataBuffer;
data.reset();
int columns = row.getColumnCount();
data.writeVarInt(columns);
data.checkCapacity(row.getByteCount(data));
if (session.isRedoLogBinaryEnabled()) {
for (int i = 0; i < columns; i++) {
data.writeValue(row.getValue(i));
}
} else {
for (int i = 0; i < columns; i++) {
Value v = row.getValue(i);
if (v.getType() == Value.BYTES) {
data.writeValue(ValueNull.INSTANCE);
} else {
data.writeValue(v);
}
}
}
Data buffer = getBuffer();
buffer.writeByte((byte) (add ? ADD : REMOVE));
buffer.writeVarInt(session.getId());
buffer.writeVarInt(tableId);
buffer.writeVarLong(row.getKey());
if (add) {
buffer.writeVarInt(data.length());
buffer.checkCapacity(data.length());
buffer.write(data.getBytes(), 0, data.length());
}
write(buffer);
}
private void write(Data data) {
pageOut.write(data.getBytes(), 0, data.length());
data.reset();
}
private static void initBuffer(Data buff) {
buff.reset();
buff.writeInt(0);
}