Exemplo n.º 1
0
 private void flushBuffer(Data buff) {
   buff.checkCapacity(1);
   buff.writeByte((byte) 0);
   buff.fillAligned();
   buff.setInt(0, buff.length() / Constants.FILE_BLOCK_SIZE);
   file.write(buff.getBytes(), 0, buff.length());
 }
Exemplo n.º 2
0
 /**
  * Prepare a transaction.
  *
  * @param session the session
  * @param transaction the name of the transaction
  */
 void prepareCommit(Session session, String transaction) {
   if (trace.isDebugEnabled()) {
     trace.debug("log prepare commit s: " + session.getId() + ", " + transaction);
   }
   if (store.getDatabase().getPageStore() == null) {
     // database already closed
     return;
   }
   // store it on a separate log page
   int pageSize = store.getPageSize();
   pageOut.flush();
   pageOut.fillPage();
   Data buffer = getBuffer();
   buffer.writeByte((byte) PREPARE_COMMIT);
   buffer.writeVarInt(session.getId());
   buffer.writeString(transaction);
   if (buffer.length() >= PageStreamData.getCapacity(pageSize)) {
     throw DbException.getInvalidValueException("transaction name (too long)", transaction);
   }
   write(buffer);
   // store it on a separate log page
   flushOut();
   pageOut.fillPage();
   if (store.getDatabase().getFlushOnEachCommit()) {
     flush();
   }
 }
Exemplo n.º 3
0
 /**
  * Get the row at the given index.
  *
  * @param at the index
  * @return the row
  */
 Row getRowAt(int at) {
   Row r = rows[at];
   if (r == null) {
     if (firstOverflowPageId == 0) {
       r = readRow(data, offsets[at], columnCount);
     } else {
       if (rowRef != null) {
         r = rowRef.get();
         if (r != null) {
           return r;
         }
       }
       PageStore store = index.getPageStore();
       Data buff = store.createData();
       int pageSize = store.getPageSize();
       int offset = offsets[at];
       buff.write(data.getBytes(), offset, pageSize - offset);
       int next = firstOverflowPageId;
       do {
         PageDataOverflow page = index.getPageOverflow(next);
         next = page.readInto(buff);
       } while (next != 0);
       overflowRowSize = pageSize + buff.length();
       r = readRow(buff, 0, columnCount);
     }
     r.setKey(keys[at]);
     if (firstOverflowPageId != 0) {
       rowRef = new SoftReference<Row>(r);
     } else {
       rows[at] = r;
       memoryChange(true, r);
     }
   }
   return r;
 }
Exemplo n.º 4
0
 private void writeAllRows() {
   if (file == null) {
     Database db = session.getDatabase();
     String fileName = db.createTempFile();
     file = db.openFile(fileName, "rw", false);
     file.setCheckedWriting(false);
     file.seek(FileStore.HEADER_LENGTH);
     rowBuff = Data.create(db, Constants.DEFAULT_PAGE_SIZE);
     file.seek(FileStore.HEADER_LENGTH);
   }
   Data buff = rowBuff;
   initBuffer(buff);
   for (int i = 0, size = list.size(); i < size; i++) {
     if (i > 0 && buff.length() > Constants.IO_BUFFER_SIZE) {
       flushBuffer(buff);
       initBuffer(buff);
     }
     Row r = list.get(i);
     writeRow(buff, r);
   }
   flushBuffer(buff);
   file.autoDelete();
   list.clear();
   memory = 0;
 }
Exemplo n.º 5
0
 /** Write the header data. */
 void initWrite() {
   data = store.createData();
   data.writeByte((byte) Page.TYPE_STREAM_DATA);
   data.writeShortInt(0);
   data.writeInt(trunk);
   data.writeInt(logKey);
   remaining = store.getPageSize() - data.length();
 }
Exemplo n.º 6
0
 /**
  * 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);
 }
Exemplo n.º 7
0
 public String toString() {
   return "["
       + getPos()
       + "] stream data key:"
       + logKey
       + " pos:"
       + data.length()
       + " remaining:"
       + remaining;
 }
Exemplo n.º 8
0
 @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;
 }
Exemplo n.º 9
0
 private Data getBuffer() {
   if (writeBuffer.length() == 0) {
     return writeBuffer;
   }
   return store.createData();
 }
Exemplo n.º 10
0
 private void write(Data data) {
   pageOut.write(data.getBytes(), 0, data.length());
   data.reset();
 }