Examples with ScheduleId com.hedera.hashgraph.sdk.ScheduleId used on opensource projects

Example 6 with ScheduleId

use of com.hedera.hashgraph.sdk.ScheduleId in project hedera-sdk-java by hashgraph.

the class ScheduledTransferExample method main.

public static void main(String[] args) throws TimeoutException, PrecheckStatusException, ReceiptStatusException {
    Client client = Client.forName(HEDERA_NETWORK);
    // Defaults the operator account ID and key such that all generated transactions will be paid for
    // by this account and be signed by this key
    client.setOperator(OPERATOR_ID, OPERATOR_KEY);
    Objects.requireNonNull(client.getOperatorAccountId());
    /*
         * A scheduled transaction is a transaction that has been proposed by an account,
         * but which requires more signatures before it will actually execute on the Hedera network.
         *
         * For example, if Alice wants to transfer an amount of Hbar to Bob, and Bob has
         * receiverSignatureRequired set to true, then that transaction must be signed by
         * both Alice and Bob before the transaction will be executed.
         *
         * To solve this problem, Alice can propose the transaction by creating a scheduled
         * transaction on the Hedera network which, if executed, would transfer Hbar from
         * Alice to Bob.  That scheduled transaction will have a ScheduleId by which we can
         * refer to that scheduled transaction.  Alice can communicate the ScheduleId to Bob, and
         * then Bob can use a ScheduleSignTransaction to sign that scheduled transaction.
         *
         * Bob has a 30 minute window in which to sign the scheduled transaction, starting at the
         * moment that Alice creates the scheduled transaction.  If a scheduled transaction
         * is not signed by all of the necessary signatories within the 30 minute window,
         * that scheduled transaction will expire, and will not be executed.
         *
         * Once a scheduled transaction has all of the signatures necessary to execute, it will
         * be executed on the Hedera network automatically.  If you create a scheduled transaction
         * on the Hedera network, but that transaction only requires your signature in order to
         * execute and no one else's, that scheduled transaction will be automatically
         * executed immediately.
         */
    PrivateKey bobsKey = PrivateKey.generateED25519();
    AccountId bobsId = new AccountCreateTransaction().setReceiverSignatureRequired(true).setKey(bobsKey).setInitialBalance(new Hbar(10)).freezeWith(client).sign(bobsKey).execute(client).getReceipt(client).accountId;
    Objects.requireNonNull(bobsId);
    System.out.println("Alice's ID: " + client.getOperatorAccountId().toStringWithChecksum(client));
    System.out.println("Bob's ID: " + bobsId.toStringWithChecksum(client));
    AccountBalance bobsInitialBalance = new AccountBalanceQuery().setAccountId(bobsId).execute(client);
    System.out.println("Bob's initial balance:");
    System.out.println(bobsInitialBalance);
    TransferTransaction transferToSchedule = new TransferTransaction().addHbarTransfer(client.getOperatorAccountId(), new Hbar(-10)).addHbarTransfer(bobsId, new Hbar(10));
    System.out.println("Transfer to be scheduled:");
    System.out.println(transferToSchedule);
    /*
         * The payerAccountId is the account that will be charged the fee
         * for executing the scheduled transaction if/when it is executed.
         * That fee is separate from the fee that we will pay to execute the
         * ScheduleCreateTransaction itself.
         *
         * To clarify: Alice pays a fee to execute the ScheduleCreateTransaction,
         * which creates the scheduled transaction on the Hedera network.
         * She specifies when creating the scheduled transaction that Bob will pay
         * the fee for the scheduled transaction when it is executed.
         *
         * If payerAccountId is not specified, the account who creates the scheduled transaction
         * will be charged for executing the scheduled transaction.
         */
    ScheduleId scheduleId = new ScheduleCreateTransaction().setScheduledTransaction(transferToSchedule).setPayerAccountId(bobsId).execute(client).getReceipt(client).scheduleId;
    Objects.requireNonNull(scheduleId);
    System.out.println("The scheduleId is: " + scheduleId.toStringWithChecksum(client));
    /*
         * Bob's balance should be unchanged.  The transfer has been scheduled, but it hasn't been executed yet
         * because it requires Bob's signature.
         */
    AccountBalance bobsBalanceAfterSchedule = new AccountBalanceQuery().setAccountId(bobsId).execute(client);
    System.out.println("Bob's balance after scheduling the transfer (should be unchanged):");
    System.out.println(bobsBalanceAfterSchedule);
    /*
         * Once Alice has communicated the scheduleId to Bob, Bob can query for information about the
         * scheduled transaction.
         */
    ScheduleInfo scheduledTransactionInfo = new ScheduleInfoQuery().setScheduleId(scheduleId).execute(client);
    System.out.println("Info about scheduled transaction:");
    System.out.println(scheduledTransactionInfo);
    /*
         * getScheduledTransaction() will return an SDK Transaction object identical to the transaction
         * that was scheduled, which Bob can then inspect like a normal transaction.
         */
    Transaction<?> scheduledTransaction = scheduledTransactionInfo.getScheduledTransaction();
    // We happen to know that this transaction is (or certainly ought to be) a TransferTransaction
    if (scheduledTransaction instanceof TransferTransaction) {
        TransferTransaction scheduledTransfer = (TransferTransaction) scheduledTransaction;
        System.out.println("The scheduled transfer transaction from Bob's POV:");
        System.out.println(scheduledTransfer);
    } else {
        System.out.println("The scheduled transaction was not a transfer transaction.");
        System.out.println("Something has gone horribly wrong.  Crashing...");
        System.exit(-1);
    }
    new ScheduleSignTransaction().setScheduleId(scheduleId).freezeWith(client).sign(bobsKey).execute(client).getReceipt(client);
    AccountBalance balanceAfterSigning = new AccountBalanceQuery().setAccountId(bobsId).execute(client);
    System.out.println("Bob's balance after signing the scheduled transaction:");
    System.out.println(balanceAfterSigning);
    ScheduleInfo postTransactionInfo = new ScheduleInfoQuery().setScheduleId(scheduleId).execute(client);
    System.out.println("Info on the scheduled transaction, executedAt should no longer be null:");
    System.out.println(postTransactionInfo);
    // Clean up
    new AccountDeleteTransaction().setTransferAccountId(client.getOperatorAccountId()).setAccountId(bobsId).freezeWith(client).sign(bobsKey).execute(client).getReceipt(client);
    client.close();
}