public void writeBytes(int record, ByteSequence bytes, boolean fixedSize) throws IOException {
synchronized (myLock) {
final int requiredLength = bytes.getLength();
final int currentCapacity = myRecordsTable.getCapacity(record);
final int currentSize = myRecordsTable.getSize(record);
assert currentSize >= 0;
if (requiredLength == 0 && currentSize == 0) return;
final long address;
if (currentCapacity >= requiredLength) {
address = myRecordsTable.getAddress(record);
} else {
myDataTable.reclaimSpace(currentCapacity);
int newCapacity =
fixedSize
? requiredLength
: myCapacityAllocationPolicy.calculateCapacity(requiredLength);
if (newCapacity < requiredLength) newCapacity = requiredLength;
address = myDataTable.allocateSpace(newCapacity);
myRecordsTable.setAddress(record, address);
myRecordsTable.setCapacity(record, newCapacity);
}
myDataTable.writeBytes(address, bytes.getBytes(), bytes.getOffset(), bytes.getLength());
myRecordsTable.setSize(record, requiredLength);
}
}
public void checkSanity(final int record) {
synchronized (myLock) {
final int size = myRecordsTable.getSize(record);
assert size >= 0;
final long address = myRecordsTable.getAddress(record);
assert address >= 0;
assert address + size < myDataTable.getFileSize();
}
}
protected byte[] readBytes(int record) throws IOException {
synchronized (myLock) {
final int length = myRecordsTable.getSize(record);
if (length == 0) return ArrayUtil.EMPTY_BYTE_ARRAY;
assert length > 0;
final long address = myRecordsTable.getAddress(record);
byte[] result = new byte[length];
myDataTable.readBytes(address, result);
return result;
}
}
private void compact(final String path) {
synchronized (myLock) {
LOG.info(
"Space waste in " + path + " is " + myDataTable.getWaste() + " bytes. Compacting now.");
long start = System.currentTimeMillis();
try {
File newDataFile = new File(path + ".storageData.backup");
FileUtil.delete(newDataFile);
FileUtil.createIfDoesntExist(newDataFile);
File oldDataFile = new File(path + DATA_EXTENSION);
DataTable newDataTable = new DataTable(newDataFile, myPool);
final int count = myRecordsTable.getRecordsCount();
for (int i = 1; i <= count; i++) {
final long addr = myRecordsTable.getAddress(i);
final int size = myRecordsTable.getSize(i);
if (size > 0) {
assert addr > 0;
final int capacity = myCapacityAllocationPolicy.calculateCapacity(size);
final long newaddr = newDataTable.allocateSpace(capacity);
final byte[] bytes = new byte[size];
myDataTable.readBytes(addr, bytes);
newDataTable.writeBytes(newaddr, bytes);
myRecordsTable.setAddress(i, newaddr);
myRecordsTable.setCapacity(i, capacity);
}
}
myDataTable.dispose();
newDataTable.dispose();
if (!FileUtil.delete(oldDataFile)) {
throw new IOException("Can't delete file: " + oldDataFile);
}
newDataFile.renameTo(oldDataFile);
myDataTable = new DataTable(oldDataFile, myPool);
} catch (IOException e) {
LOG.info("Compact failed: " + e.getMessage());
}
long timedelta = System.currentTimeMillis() - start;
LOG.info("Done compacting in " + timedelta + "msec.");
}
}
protected void appendBytes(int record, ByteSequence bytes) throws IOException {
final int delta = bytes.getLength();
if (delta == 0) return;
synchronized (myLock) {
int capacity = myRecordsTable.getCapacity(record);
int oldSize = myRecordsTable.getSize(record);
int newSize = oldSize + delta;
if (newSize > capacity) {
if (oldSize > 0) {
final byte[] newbytes = new byte[newSize];
System.arraycopy(readBytes(record), 0, newbytes, 0, oldSize);
System.arraycopy(bytes.getBytes(), bytes.getOffset(), newbytes, oldSize, delta);
writeBytes(record, new ByteSequence(newbytes), false);
} else {
writeBytes(record, bytes, false);
}
} else {
long address = myRecordsTable.getAddress(record) + oldSize;
myDataTable.writeBytes(address, bytes.getBytes(), bytes.getOffset(), bytes.getLength());
myRecordsTable.setSize(record, newSize);
}
}
}