public static void main(String[] args) throws Exception {
fc = new RandomAccessFile("test.dat", "rw").getChannel();
MappedByteBuffer out = fc.map(FileChannel.MapMode.READ_WRITE, 0, LENGTH);
for (int i = 0; i < LENGTH; i++) out.put((byte) 'x');
new LockAndModify(out, 0, 0 + LENGTH / 3);
new LockAndModify(out, LENGTH / 2, LENGTH / 2 + LENGTH / 4);
}
@Override
public void setChainHead(StoredBlock chainHead) throws BlockStoreException {
final MappedByteBuffer buffer = this.buffer;
if (buffer == null) throw new BlockStoreException("Store closed");
lock.lock();
try {
lastChainHead = chainHead;
byte[] headHash = chainHead.getHeader().getHash().getBytes();
buffer.position(8);
buffer.put(headHash);
} finally {
lock.unlock();
}
}
private void initNewStore(NetworkParameters params) throws Exception {
byte[] header;
header = HEADER_MAGIC.getBytes("US-ASCII");
buffer.put(header);
// Insert the genesis block.
lock.lock();
try {
setRingCursor(buffer, FILE_PROLOGUE_BYTES);
} finally {
lock.unlock();
}
Block genesis = params.getGenesisBlock().cloneAsHeader();
StoredBlock storedGenesis = new StoredBlock(genesis, genesis.getWork(), 0);
put(storedGenesis);
setChainHead(storedGenesis);
}
@Override
public void put(StoredBlock block) throws BlockStoreException {
final MappedByteBuffer buffer = this.buffer;
if (buffer == null) throw new BlockStoreException("Store closed");
lock.lock();
try {
int cursor = getRingCursor(buffer);
if (cursor == getFileSize()) {
// Wrapped around.
cursor = FILE_PROLOGUE_BYTES;
}
buffer.position(cursor);
Sha256Hash hash = block.getHeader().getHash();
notFoundCache.remove(hash);
buffer.put(hash.getBytes());
block.serializeCompact(buffer);
setRingCursor(buffer, buffer.position());
blockCache.put(hash, block);
} finally {
lock.unlock();
}
}