@Override public byte[] serializeWalletExtension() { lock.lock(); try { ClientState.StoredClientPaymentChannels.Builder builder = ClientState.StoredClientPaymentChannels.newBuilder(); for (StoredClientChannel channel : mapChannels.values()) { // First a few asserts to make sure things won't break checkState( channel.valueToMe.signum() >= 0 && channel.valueToMe.compareTo(NetworkParameters.MAX_MONEY) < 0); checkState( channel.refundFees.signum() >= 0 && channel.refundFees.compareTo(NetworkParameters.MAX_MONEY) < 0); checkNotNull(channel.myKey.getPubKey()); checkState(channel.refund.getConfidence().getSource() == TransactionConfidence.Source.SELF); final ClientState.StoredClientPaymentChannel.Builder value = ClientState.StoredClientPaymentChannel.newBuilder() .setId(ByteString.copyFrom(channel.id.getBytes())) .setContractTransaction(ByteString.copyFrom(channel.contract.bitcoinSerialize())) .setRefundTransaction(ByteString.copyFrom(channel.refund.bitcoinSerialize())) .setMyKey( ByteString.copyFrom(new byte[0])) // Not used, but protobuf message requires .setMyPublicKey(ByteString.copyFrom(channel.myKey.getPubKey())) .setValueToMe(channel.valueToMe.value) .setRefundFees(channel.refundFees.value); if (channel.close != null) value.setCloseTransactionHash(ByteString.copyFrom(channel.close.getHash().getBytes())); builder.addChannels(value); } return builder.build().toByteArray(); } finally { lock.unlock(); } }