private void createNewStore(NetworkParameters params, File file) throws BlockStoreException {
// Create a new block store if the file wasn't found or anything went wrong whilst reading.
blockCache.clear();
try {
if (file.exists()) {
if (!file.delete())
throw new BlockStoreException("Could not delete old store in order to recreate it");
}
// Create fresh. The d makes writes synchronous.
this.file = new RandomAccessFile(file, "rwd");
this.channel = this.file.getChannel();
lock();
this.file.write(FILE_FORMAT_VERSION);
} catch (IOException e1) {
// We could not load a block store nor could we create a new one!
throw new BlockStoreException(e1);
}
try {
// Set up the genesis block. When we start out fresh, it is by definition the top of the
// chain.
Block genesis = params.genesisBlock.cloneAsHeader();
StoredBlock storedGenesis = new StoredBlock(genesis, genesis.getWork(), 0);
this.chainHead = storedGenesis.getHeader().getHash();
this.file.write(this.chainHead.getBytes());
put(storedGenesis);
} catch (VerificationException e1) {
throw new RuntimeException(e1); // Cannot happen.
} catch (IOException e) {
throw new BlockStoreException(e);
}
}
public synchronized void setChainHead(StoredBlock chainHead) throws BlockStoreException {
ensureOpen();
try {
this.chainHead = chainHead.getHeader().getHash();
// Write out new hash to the first 32 bytes of the file past one (first byte is version
// number).
channel.write(ByteBuffer.wrap(this.chainHead.getBytes()), 1);
} catch (IOException e) {
throw new BlockStoreException(e);
}
}
public synchronized void put(StoredBlock block) throws BlockStoreException {
ensureOpen();
try {
Sha256Hash hash = block.getHeader().getHash();
// Append to the end of the file.
Record.write(channel, block);
blockCache.put(hash, block);
} catch (IOException e) {
throw new BlockStoreException(e);
}
}
public static void write(FileChannel channel, StoredBlock block) throws IOException {
ByteBuffer buf = ByteBuffer.allocate(Record.SIZE);
buf.putInt(block.getHeight());
byte[] chainWorkBytes = block.getChainWork().toByteArray();
checkState(
chainWorkBytes.length <= CHAIN_WORK_BYTES, "Ran out of space to store chain work!");
if (chainWorkBytes.length < CHAIN_WORK_BYTES) {
// Pad to the right size.
buf.put(EMPTY_BYTES, 0, CHAIN_WORK_BYTES - chainWorkBytes.length);
}
buf.put(chainWorkBytes);
buf.put(block.getHeader().cloneAsHeader().feathercoinSerialize());
buf.position(0);
channel.position(channel.size());
if (channel.write(buf) < Record.SIZE) throw new IOException("Failed to write record!");
channel.position(channel.size() - Record.SIZE);
}