@Override
public String toString() {
StringBuilder rv = new StringBuilder("#Block-").append(blockNum).append(":\n");
for (int i = 0; i < ConfigParameters.getInstance().getBufferSize(); i++)
rv.append(buffer.get(i));
return rv.toString();
}
/** Created by kostas on 4/16/14. */
public class Block {
private static final int bufferSize = ConfigParameters.getInstance().getBufferSize();
private static final boolean durableWrites = ConfigParameters.getInstance().isDurable();
private final BlockFile bf;
private final FileChannel channel;
private int blockNum;
private final ByteBuffer buffer;
private boolean dirty = false;
private boolean disposed = false;
private boolean newBlock;
public Block(int blockNum, ByteBuffer buffer, BlockFile bf, boolean newBlock) {
this.blockNum = blockNum;
this.buffer = buffer;
this.bf = bf;
this.channel = bf.getChannel();
this.newBlock = newBlock;
}
public int getBlockNum() {
return blockNum;
}
public ByteBuffer getBuffer() {
return buffer;
}
public void setBlockNum(int blockNum) {
this.dirty = true;
this.blockNum = blockNum;
}
public boolean isDirty() {
return dirty;
}
public void putInt(int index, int value) {
this.dirty = true;
this.buffer.putInt(index, value);
}
public int getInt(int index) {
return this.buffer.getInt(index);
}
public void putByte(int index, byte value) {
this.dirty = true;
this.buffer.put(index, value);
}
public byte getByte(int index) {
return this.buffer.get(index);
}
public FileChannel getChannel() {
return this.channel;
}
public boolean isDisposed() {
return disposed;
}
public void setDisposed(boolean disposed) {
this.disposed = disposed;
}
public boolean isNewBlock() {
return newBlock;
}
public void setNewBlock(boolean newBlock) {
this.newBlock = newBlock;
}
public void writeToFile() throws IOException {
assert this.blockNum >= 0;
assert this.dirty;
buffer.position(0);
channel.position(bufferSize * blockNum);
while (buffer.hasRemaining()) channel.write(buffer);
if (durableWrites) channel.force(true);
this.dirty = false;
}
public void commit() throws IOException {
this.bf.commitBlock(this);
}
public void invalidate() throws IOException {
this.bf.invalidateBlock(this);
}
public void forceDispose() throws IOException, InvalidBlockException {
this.bf.forceDispose(this);
}
public BlockFile getBlockFile() {
return this.bf;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Block block = (Block) o;
if (blockNum != block.blockNum) return false;
if (!channel.equals(block.channel)) return false;
return true;
}
@Override
public int hashCode() {
int result = channel.hashCode();
result = 31 * result + blockNum;
return result;
}
@Override
public String toString() {
StringBuilder rv = new StringBuilder("#Block-").append(blockNum).append(":\n");
for (int i = 0; i < ConfigParameters.getInstance().getBufferSize(); i++)
rv.append(buffer.get(i));
return rv.toString();
}
}
