A Batch Request for querying Coin and Tokens

[soharang]

Hi,

Is there any way to get coin and token balances in the same account with one query?

For example, I have ETH account and in there, three ERC20 Tokens A,B,C.
So far, to get all balances of them, I have to do 4 queries - one for ETH, and three for each token.

As far as I know, I can use BatchRequest for multiple request but I have no idea how to apply ERC20 balance query in it.

Thanks in advance.

[NickSneo]

You can use this class - https://github.com/web3j/web3j/blob/master/core/src/main/java/org/web3j/protocol/core/BatchRequest.java
Create a new BatchRequest, add requests to this and lastly use send function to send the batchRequest.

[soharang]

Thank you for caring my old query :)

[ShubhamChouksey123]

I have used batch call to the miner to simultaneously get a list of receipts. You can create similar for tokens or coins.

 public List<Object> getReceiptList(List<String> hashes) throws ServerInternalError {

        if (hashes == null || hashes.isEmpty()) {
            return Collections.emptyList();
        }

        BatchRequest batchRequest = web3j.newBatch();
        for (String hash : hashes) {
            batchRequest.add(web3j.ethGetTransactionReceipt(hash));
        }

        List<Object> listOfReceipt = new ArrayList<>(Collections.nCopies(hashes.size(), null));

        BatchResponse batchResponse;
        try {
            batchResponse = batchRequest.send();
        } catch (IOException e) {
            throw new ServerInternalError("Unable to connect to miner!");
        }
        List<? extends Response<?>> response = batchResponse.getResponses();

        if (response != null && !response.isEmpty()) {
            for (int i = 0; i < hashes.size(); i++) {
                Response<?> eachResp = response.get(i);
                if (eachResp instanceof EthGetTransactionReceipt ethGetTransactionReceipt) {
                    if (ethGetTransactionReceipt.getTransactionReceipt().isPresent()) {
                        listOfReceipt.set(i, ethGetTransactionReceipt.getTransactionReceipt().get());
                    }
                }
            }
        }

        return listOfReceipt;
    }