Fase 6: Visualizzare la cronologia delle revisioni di un documento

Per visualizzare la cronologia delle revisioni

1. Esamina il seguente programma (QueryHistory.java).

   2.x

   /*
    * 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 java.io.IOException;
   import java.time.Instant;
   import java.time.temporal.ChronoUnit;
   
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import com.amazon.ion.IonValue;
   
   import software.amazon.qldb.Result;
   import software.amazon.qldb.TransactionExecutor;
   import software.amazon.qldb.tutorial.model.SampleData;
   import software.amazon.qldb.tutorial.model.VehicleRegistration;
   
   /**
    * Query a table's history for a particular set of documents.
    *
    * 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 QueryHistory {
       public static final Logger log = LoggerFactory.getLogger(QueryHistory.class);
       private static final int THREE_MONTHS = 90;
   
       private QueryHistory() { }
   
       /**
        * In this example, query the 'VehicleRegistration' history table to find all previous primary owners for a VIN.
        *
        * @param txn
        *              The {@link TransactionExecutor} for lambda execute.
        * @param vin
        *              VIN to find previous primary owners for.
        * @param query
        *              The query to find previous primary owners.
        * @throws IllegalStateException if failed to convert document ID to an {@link IonValue}.
        */
       public static void previousPrimaryOwners(final TransactionExecutor txn, final String vin, final String query) {
           try {
               final String docId = VehicleRegistration.getDocumentIdByVin(txn, vin);
   
               log.info("Querying the 'VehicleRegistration' table's history using VIN: {}...", vin);
               final Result result = txn.execute(query, Constants.MAPPER.writeValueAsIonValue(docId));
               ScanTable.printDocuments(result);
           } catch (IOException ioe) {
               throw new IllegalStateException(ioe);
           }
       }
   
       public static void main(final String... args) {
           final String threeMonthsAgo = Instant.now().minus(THREE_MONTHS, ChronoUnit.DAYS).toString();
           final String query = String.format("SELECT data.Owners.PrimaryOwner, metadata.version "
                                              + "FROM history(VehicleRegistration, `%s`) "
                                              + "AS h WHERE h.metadata.id = ?", threeMonthsAgo);
           ConnectToLedger.getDriver().execute(txn -> {
               final String vin = SampleData.VEHICLES.get(0).getVin();
               previousPrimaryOwners(txn, vin, query);
           });
           log.info("Successfully queried history.");
       }
   }
   

   1.x

   /*
    * Copyright 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.amazon.ion.IonValue;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   import software.amazon.qldb.QldbSession;
   import software.amazon.qldb.Result;
   import software.amazon.qldb.TransactionExecutor;
   import software.amazon.qldb.tutorial.model.SampleData;
   import software.amazon.qldb.tutorial.model.VehicleRegistration;
   
   import java.io.IOException;
   import java.time.Instant;
   import java.time.temporal.ChronoUnit;
   import java.util.Collections;
   import java.util.List;
   
   /**
    * Query a table's history for a particular set of documents.
    *
    * 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 QueryHistory {
       public static final Logger log = LoggerFactory.getLogger(QueryHistory.class);
       private static final int THREE_MONTHS = 90;
   
       private QueryHistory() { }
   
       /**
        * In this example, query the 'VehicleRegistration' history table to find all previous primary owners for a VIN.
        *
        * @param txn
        *              The {@link TransactionExecutor} for lambda execute.
        * @param vin
        *              VIN to find previous primary owners for.
        * @param query
        *              The query to find previous primary owners.
        * @throws IllegalStateException if failed to convert document ID to an {@link IonValue}.
        */
       public static void previousPrimaryOwners(final TransactionExecutor txn, final String vin, final String query) {
           try {
               final String docId = VehicleRegistration.getDocumentIdByVin(txn, vin);
               final List<IonValue> parameters = Collections.singletonList(Constants.MAPPER.writeValueAsIonValue(docId));
               log.info("Querying the 'VehicleRegistration' table's history using VIN: {}...", vin);
               final Result result = txn.execute(query, parameters);
               ScanTable.printDocuments(result);
           } catch (IOException ioe) {
               throw new IllegalStateException(ioe);
           }
       }
   
       public static void main(final String... args) {
           final String threeMonthsAgo = Instant.now().minus(THREE_MONTHS, ChronoUnit.DAYS).toString();
           final String query = String.format("SELECT data.Owners.PrimaryOwner, metadata.version "
                                              + "FROM history(VehicleRegistration, `%s`) "
                                              + "AS h WHERE h.metadata.id = ?", threeMonthsAgo);
           ConnectToLedger.getDriver().execute(txn -> {
               final String vin = SampleData.VEHICLES.get(0).getVin();
               previousPrimaryOwners(txn, vin, query);
           }, (retryAttempt) -> log.info("Retrying due to OCC conflict..."));
           log.info("Successfully queried history.");
       }
   }

   Nota

   • È possibile visualizzare la cronologia delle revisioni di un documento interrogando la sintassi incorporata Funzione di cronologia nella seguente.

     SELECT * FROM history( table_name [, `start-time` [, `end-time` ] ] ) AS h
     [ WHERE h.metadata.id = 'id' ]

   • L'ora di inizio e l'ora di fine sono entrambe opzionali. Sono valori letterali di Amazon Ion che possono essere indicati con backticks (). `...` Per ulteriori informazioni, consulta Interrogare Ion con PartiQL in Amazon QLDB.

   • Come best practice, qualifica una query cronologica con un intervallo di date (ora di inizio e ora di fine) e un ID del documento (). metadata.id QLDBelabora SELECT le interrogazioni nelle transazioni, che sono soggette a un limite di timeout delle transazioni.

     QLDBla cronologia è indicizzata in base all'ID del documento e al momento non è possibile creare indici cronologici aggiuntivi. Le interrogazioni cronologiche che includono l'ora di inizio e l'ora di fine ottengono il vantaggio della qualificazione per intervalli di date.

2. Compila ed esegui il QueryHistory.java programma con cui interrogare la cronologia delle revisioni del documento. VehicleRegistration VIN 1N4AL11D75C109151