Le traduzioni sono generate tramite traduzione automatica. In caso di conflitto tra il contenuto di una traduzione e la versione originale in Inglese, quest'ultima prevarrà.

# TryDax.java
<a name="DAX.client.TryDax.java"></a>

```
import java.util.Map;

import software.amazon.awssdk.services.dynamodb.DynamoDbAsyncClient;
import software.amazon.awssdk.services.dynamodb.model.AttributeDefinition;
import software.amazon.awssdk.services.dynamodb.model.AttributeValue;
import software.amazon.awssdk.services.dynamodb.model.BillingMode;
import software.amazon.awssdk.services.dynamodb.model.CreateTableRequest;
import software.amazon.awssdk.services.dynamodb.model.DeleteTableRequest;
import software.amazon.awssdk.services.dynamodb.model.DescribeTableRequest;
import software.amazon.awssdk.services.dynamodb.model.GetItemRequest;
import software.amazon.awssdk.services.dynamodb.model.KeySchemaElement;
import software.amazon.awssdk.services.dynamodb.model.KeyType;
import software.amazon.awssdk.services.dynamodb.model.PutItemRequest;
import software.amazon.awssdk.services.dynamodb.model.QueryRequest;
import software.amazon.awssdk.services.dynamodb.model.ScalarAttributeType;
import software.amazon.dax.ClusterDaxAsyncClient;
import software.amazon.dax.Configuration;

public class TryDax {
    public static void main(String[] args) throws Exception {
        DynamoDbAsyncClient ddbClient = DynamoDbAsyncClient.builder()
                .build();

        DynamoDbAsyncClient daxClient = null;
        if (args.length >= 1) {
            daxClient = ClusterDaxAsyncClient.builder()
                    .overrideConfiguration(Configuration.builder()
                            .url(args[0]) // e.g. dax://my-cluster.l6fzcv.dax-clusters.us-east-1.amazonaws.com
                            .build())
                    .build();
        }

        String tableName = "TryDaxTable";

        System.out.println("Creating table...");
        createTable(tableName, ddbClient);

        System.out.println("Populating table...");
        writeData(tableName, ddbClient, 100, 10);

        DynamoDbAsyncClient testClient = null;
        if (daxClient != null) {
            testClient = daxClient;
        } else {
            testClient = ddbClient;
        }

        System.out.println("Running GetItem and Query tests...");
        System.out.println("First iteration of each test will result in cache misses");
        System.out.println("Next iterations are cache hits\n");

        // GetItem
        getItemTest(tableName, testClient, 100, 10, 5);

        // Query
        queryTest(tableName, testClient, 100, 2, 9, 5);

        System.out.println("Deleting table...");
        deleteTable(tableName, ddbClient);
    }

    private static void createTable(String tableName, DynamoDbAsyncClient client) {
        try {
            System.out.println("Attempting to create table; please wait...");

            client.createTable(CreateTableRequest.builder()
                    .tableName(tableName)
                    .keySchema(KeySchemaElement.builder()
                            .keyType(KeyType.HASH)
                            .attributeName("pk")
                            .build(), KeySchemaElement.builder()
                            .keyType(KeyType.RANGE)
                            .attributeName("sk")
                            .build())
                    .attributeDefinitions(AttributeDefinition.builder()
                            .attributeName("pk")
                            .attributeType(ScalarAttributeType.N)
                            .build(), AttributeDefinition.builder()
                            .attributeName("sk")
                            .attributeType(ScalarAttributeType.N)
                            .build())
                    .billingMode(BillingMode.PAY_PER_REQUEST)
                    .build()).get();
            client.waiter().waitUntilTableExists(DescribeTableRequest.builder()
                    .tableName(tableName)
                    .build()).get();
            System.out.println("Successfully created table.");

        } catch (Exception e) {
            System.err.println("Unable to create table: ");
            e.printStackTrace();
        }
    }

    private static void deleteTable(String tableName, DynamoDbAsyncClient client) {
        try {
            System.out.println("\nAttempting to delete table; please wait...");
            client.deleteTable(DeleteTableRequest.builder()
                    .tableName(tableName)
                    .build()).get();
            client.waiter().waitUntilTableNotExists(DescribeTableRequest.builder()
                    .tableName(tableName)
                    .build()).get();
            System.out.println("Successfully deleted table.");

        } catch (Exception e) {
            System.err.println("Unable to delete table: ");
            e.printStackTrace();
        }
    }

    private static void writeData(String tableName, DynamoDbAsyncClient client, int pkmax, int skmax) {
        System.out.println("Writing data to the table...");

        int stringSize = 1000;
        StringBuilder sb = new StringBuilder(stringSize);
        for (int i = 0; i < stringSize; i++) {
            sb.append('X');
        }
        String someData = sb.toString();

        try {
            for (int ipk = 1; ipk <= pkmax; ipk++) {
                System.out.println(("Writing " + skmax + " items for partition key: " + ipk));
                for (int isk = 1; isk <= skmax; isk++) {
                    client.putItem(PutItemRequest.builder()
                            .tableName(tableName)
                            .item(Map.of("pk", attr(ipk), "sk", attr(isk), "someData", attr(someData)))
                            .build()).get();
                }
            }
        } catch (Exception e) {
            System.err.println("Unable to write item:");
            e.printStackTrace();
        }
    }

    private static AttributeValue attr(int n) {
        return AttributeValue.builder().n(String.valueOf(n)).build();
    }

    private static AttributeValue attr(String s) {
        return AttributeValue.builder().s(s).build();
    }

    private static void getItemTest(String tableName, DynamoDbAsyncClient client, int pk, int sk, int iterations) {
        long startTime, endTime;
        System.out.println("GetItem test - partition key 1-" + pk + " and sort keys 1-" + sk);

        for (int i = 0; i < iterations; i++) {
            startTime = System.nanoTime();
            try {
                for (int ipk = 1; ipk <= pk; ipk++) {
                    for (int isk = 1; isk <= sk; isk++) {
                        client.getItem(GetItemRequest.builder()
                                .tableName(tableName)
                                .key(Map.of("pk", attr(ipk), "sk", attr(isk)))
                                .build()).get();
                    }
                }
            } catch (Exception e) {
                System.err.println("Unable to get item:");
                e.printStackTrace();
            }
            endTime = System.nanoTime();
            printTime(startTime, endTime, pk * sk);
        }
    }

    private static void queryTest(String tableName, DynamoDbAsyncClient client, int pk, int sk1, int sk2, int iterations) {
        long startTime, endTime;
        System.out.println("Query test - partition key 1-" + pk + " and sort keys between " + sk1 + " and " + sk2);

        for (int i = 0; i < iterations; i++) {
            startTime = System.nanoTime();
            for (int ipk = 1; ipk <= pk; ipk++) {
                try {
                    // Pagination API for Query.
                    client.queryPaginator(QueryRequest.builder()
                            .tableName(tableName)
                            .keyConditionExpression("pk = :pkval and sk between :skval1 and :skval2")
                            .expressionAttributeValues(Map.of(":pkval", attr(ipk), ":skval1", attr(sk1), ":skval2", attr(sk2)))
                            .build()).items().subscribe((item) -> {
                    }).get();
                } catch (Exception e) {
                    System.err.println("Unable to query table:");
                    e.printStackTrace();
                }
            }
            endTime = System.nanoTime();
            printTime(startTime, endTime, pk);
        }
    }

    private static void printTime(long startTime, long endTime, int iterations) {
        System.out.format("\tTotal time: %.3f ms - ", (endTime - startTime) / (1000000.0));
        System.out.format("Avg time: %.3f ms\n", (endTime - startTime) / (iterations * 1000000.0));
    }
}
```