Langkah 9 (opsional): Bersihkan sumber daya

Untuk menghapus buku besar

1. Kompilasi dan jalankan program berikut (DeleteLedger.java) untuk menghapus vehicle-registration buku besar Anda dan semua isinya.

   /*
    * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
    * SPDX-License-Identifier: MIT-0
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy of this
    * software and associated documentation files (the "Software"), to deal in the Software
    * without restriction, including without limitation the rights to use, copy, modify,
    * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
    * permit persons to whom the Software is furnished to do so.
    *
    * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
    * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
    * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    */
   
   package software.amazon.qldb.tutorial;
   
   import com.amazonaws.services.qldb.AmazonQLDB;
   import com.amazonaws.services.qldb.model.DeleteLedgerRequest;
   import com.amazonaws.services.qldb.model.DeleteLedgerResult;
   import com.amazonaws.services.qldb.model.ResourceNotFoundException;
   import com.amazonaws.services.qldb.model.UpdateLedgerRequest;
   import com.amazonaws.services.qldb.model.UpdateLedgerResult;
   
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   /**
    * Delete a ledger.
    *
    * This code expects that you have AWS credentials setup per:
    * http://docs.aws.amazon.com/java-sdk/latest/developer-guide/setup-credentials.html
    */
   public final class DeleteLedger {
       public static final Logger log = LoggerFactory.getLogger(DeleteLedger.class);
       public static final Long LEDGER_DELETION_POLL_PERIOD_MS = 20_000L;
       public static AmazonQLDB client = CreateLedger.getClient();
   
       private DeleteLedger() { }
   
       public static void main(String... args) throws Exception {
           try {
               setDeletionProtection(Constants.LEDGER_NAME, false);
   
               delete(Constants.LEDGER_NAME);
   
               waitForDeleted(Constants.LEDGER_NAME);
   
           } catch (Exception e) {
               log.error("Unable to delete the ledger.", e);
               throw e;
           }
       }
   
       /**
        * Send a request to the QLDB database to delete the specified ledger.
        *
        * @param ledgerName
        *              Name of the ledger to be deleted.
        * @return DeleteLedgerResult.
        */
       public static DeleteLedgerResult delete(final String ledgerName) {
           log.info("Attempting to delete the ledger with name: {}...", ledgerName);
           DeleteLedgerRequest request = new DeleteLedgerRequest().withName(ledgerName);
           DeleteLedgerResult result = client.deleteLedger(request);
           log.info("Success.");
           return result;
       }
   
       /**
        * Wait for the ledger to be deleted.
        *
        * @param ledgerName
        *              Name of the ledger being deleted.
        * @throws InterruptedException if thread is being interrupted.
        */
       public static void waitForDeleted(final String ledgerName) throws InterruptedException {
           log.info("Waiting for the ledger to be deleted...");
           while (true) {
               try {
                   DescribeLedger.describe(ledgerName);
                   log.info("The ledger is still being deleted. Please wait...");
                   Thread.sleep(LEDGER_DELETION_POLL_PERIOD_MS);
               } catch (ResourceNotFoundException ex) {
                   log.info("Success. The ledger is deleted.");
                   break;
               }
           }
       }
       
       public static UpdateLedgerResult setDeletionProtection(String ledgerName, boolean deletionProtection) {
           log.info("Let's set deletionProtection to {} for the ledger with name {}", deletionProtection, ledgerName);
           UpdateLedgerRequest request = new UpdateLedgerRequest()
                   .withName(ledgerName)
                   .withDeletionProtection(deletionProtection);
   
           UpdateLedgerResult result = client.updateLedger(request);
           log.info("Success. Ledger updated: {}", result);
           return result;
       }
   }
   

   catatan

   Jika perlindungan penghapusan diaktifkan untuk buku besar Anda, Anda harus menonaktifkannya terlebih dahulu sebelum Anda dapat menghapus buku besar menggunakan. QLDB API

2. Jika Anda mengekspor data jurnal pada langkah sebelumnya dan tidak lagi membutuhkannya, gunakan konsol Amazon S3 untuk menghapus bucket S3 Anda.

   Buka konsol Amazon S3 di. https://console.aws.amazon.com/s3/