Nozioni di base su PartiQL per DynamoDB

import java.util.ArrayList;
import java.util.List;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.ConditionalCheckFailedException;
import com.amazonaws.services.dynamodbv2.model.ExecuteStatementRequest;
import com.amazonaws.services.dynamodbv2.model.ExecuteStatementResult;
import com.amazonaws.services.dynamodbv2.model.InternalServerErrorException;
import com.amazonaws.services.dynamodbv2.model.ItemCollectionSizeLimitExceededException;
import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughputExceededException;
import com.amazonaws.services.dynamodbv2.model.RequestLimitExceededException;
import com.amazonaws.services.dynamodbv2.model.ResourceNotFoundException;
import com.amazonaws.services.dynamodbv2.model.TransactionConflictException;

public class DynamoDBPartiQGettingStarted {

    public static void main(String[] args) {
        // Create the DynamoDB Client with the region you want
        AmazonDynamoDB dynamoDB = createDynamoDbClient("us-west-1");

        try {
            // Create ExecuteStatementRequest
            ExecuteStatementRequest executeStatementRequest = new ExecuteStatementRequest();
            List<AttributeValue> parameters= getPartiQLParameters();

            //Create an item in the Music table using the INSERT PartiQL statement
            processResults(executeStatementRequest(dynamoDB, "INSERT INTO Music value {'Artist':?,'SongTitle':?}", parameters));

            //Retrieve an item from the Music table using the SELECT PartiQL statement.
            processResults(executeStatementRequest(dynamoDB, "SELECT * FROM Music  where Artist=? and SongTitle=?", parameters));

            //Update an item in the Music table using the UPDATE PartiQL statement.
            processResults(executeStatementRequest(dynamoDB, "UPDATE Music SET AwardsWon=1 SET AwardDetail={'Grammys':[2020, 2018]}  where Artist=? and SongTitle=?", parameters));

            //Add a list value for an item in the Music table.
            processResults(executeStatementRequest(dynamoDB, "UPDATE Music SET AwardDetail.Grammys =list_append(AwardDetail.Grammys,[2016])  where Artist=? and SongTitle=?", parameters));

            //Remove a list value for an item in the Music table.
            processResults(executeStatementRequest(dynamoDB, "UPDATE Music REMOVE AwardDetail.Grammys[2]   where Artist=? and SongTitle=?", parameters));

            //Add a new map member for an item in the Music table.
            processResults(executeStatementRequest(dynamoDB, "UPDATE Music set AwardDetail.BillBoard=[2020] where Artist=? and SongTitle=?", parameters));

            //Add a new string set attribute for an item in the Music table.
            processResults(executeStatementRequest(dynamoDB, "UPDATE Music SET BandMembers =<<'member1', 'member2'>> where Artist=? and SongTitle=?", parameters));

            //update a string set attribute for an item in the Music table.
            processResults(executeStatementRequest(dynamoDB, "UPDATE Music SET BandMembers =set_add(BandMembers, <<'newmember'>>) where Artist=? and SongTitle=?", parameters));

            //Retrieve an item from the Music table using the SELECT PartiQL statement.
            processResults(executeStatementRequest(dynamoDB, "SELECT * FROM Music  where Artist=? and SongTitle=?", parameters));

            //delete an item from the Music Table
            processResults(executeStatementRequest(dynamoDB, "DELETE  FROM Music  where Artist=? and SongTitle=?", parameters));
        } catch (Exception e) {
            handleExecuteStatementErrors(e);
        }
    }

    private static AmazonDynamoDB createDynamoDbClient(String region) {
        return AmazonDynamoDBClientBuilder.standard().withRegion(region).build();
    }

    private static List<AttributeValue> getPartiQLParameters() {
        List<AttributeValue> parameters = new ArrayList<AttributeValue>();
        parameters.add(new AttributeValue("Acme Band"));
        parameters.add(new AttributeValue("PartiQL Rocks"));
        return parameters;
    }

    private static ExecuteStatementResult executeStatementRequest(AmazonDynamoDB client, String statement, List<AttributeValue> parameters ) {
        ExecuteStatementRequest request = new ExecuteStatementRequest();
        request.setStatement(statement);
        request.setParameters(parameters);
        return client.executeStatement(request);
    }

    private static void processResults(ExecuteStatementResult executeStatementResult) {
        System.out.println("ExecuteStatement successful: "+ executeStatementResult.toString());

    }

    // Handles errors during ExecuteStatement execution. Use recommendations in error messages below to add error handling specific to
    // your application use-case.
    private static void handleExecuteStatementErrors(Exception exception) {
        try {
            throw exception;
        } catch (ConditionalCheckFailedException ccfe) {
            System.out.println("Condition check specified in the operation failed, review and update the condition " +
                                       "check before retrying. Error: " + ccfe.getErrorMessage());
        } catch (TransactionConflictException tce) {
            System.out.println("Operation was rejected because there is an ongoing transaction for the item, generally " +
                                       "safe to retry with exponential back-off. Error: " + tce.getErrorMessage());
        } catch (ItemCollectionSizeLimitExceededException icslee) {
            System.out.println("An item collection is too large, you\'re using Local Secondary Index and exceeded " +
                                       "size limit of items per partition key. Consider using Global Secondary Index instead. Error: " + icslee.getErrorMessage());
        } catch (Exception e) {
            handleCommonErrors(e);
        }
    }

    private static void handleCommonErrors(Exception exception) {
        try {
            throw exception;
        } catch (InternalServerErrorException isee) {
            System.out.println("Internal Server Error, generally safe to retry with exponential back-off. Error: " + isee.getErrorMessage());
        } catch (RequestLimitExceededException rlee) {
            System.out.println("Throughput exceeds the current throughput limit for your account, increase account level throughput before " +
                                       "retrying. Error: " + rlee.getErrorMessage());
        } catch (ProvisionedThroughputExceededException ptee) {
            System.out.println("Request rate is too high. If you're using a custom retry strategy make sure to retry with exponential back-off. " +
                                       "Otherwise consider reducing frequency of requests or increasing provisioned capacity for your table or secondary index. Error: " +
                                       ptee.getErrorMessage());
        } catch (ResourceNotFoundException rnfe) {
            System.out.println("One of the tables was not found, verify table exists before retrying. Error: " + rnfe.getErrorMessage());
        } catch (AmazonServiceException ase) {
            System.out.println("An AmazonServiceException occurred, indicates that the request was correctly transmitted to the DynamoDB " +
                                       "service, but for some reason, the service was not able to process it, and returned an error response instead. Investigate and " +
                                       "configure retry strategy. Error type: " + ase.getErrorType() + ". Error message: " + ase.getErrorMessage());
        } catch (AmazonClientException ace) {
            System.out.println("An AmazonClientException occurred, indicates that the client was unable to get a response from DynamoDB " +
                                       "service, or the client was unable to parse the response from the service. Investigate and configure retry strategy. "+
                                       "Error: " + ace.getMessage());
        } catch (Exception e) {
            System.out.println("An exception occurred, investigate and configure retry strategy. Error: " + e.getMessage());
        }
    }

}