// snippet-sourcedescription:[ ]
// snippet-service:[dynamodb]
// snippet-keyword:[Java]
// snippet-sourcesyntax:[java]
// snippet-keyword:[Amazon DynamoDB]
// snippet-keyword:[Code Sample]
// snippet-keyword:[ ]
// snippet-sourcetype:[full-example]
// snippet-sourcedate:[ ]
// snippet-sourceauthor:[AWS]
// snippet-start:[dynamodb.java.trydax.TryDaxHelper] 

/**
 * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * This file is licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License. A copy of
 * the License is located at
 *
 * http://aws.amazon.com/apache2.0/
 *
 * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
*/
import java.util.Arrays;

import com.amazon.dax.client.dynamodbv2.AmazonDaxClientBuilder;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
import com.amazonaws.services.dynamodbv2.document.DynamoDB;
import com.amazonaws.services.dynamodbv2.document.Item;
import com.amazonaws.services.dynamodbv2.document.Table;
import com.amazonaws.services.dynamodbv2.model.AttributeDefinition;
import com.amazonaws.services.dynamodbv2.model.KeySchemaElement;
import com.amazonaws.services.dynamodbv2.model.KeyType;
import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput;
import com.amazonaws.services.dynamodbv2.model.ScalarAttributeType;
import com.amazonaws.util.EC2MetadataUtils;

 public class TryDaxHelper {

    private static final String region = EC2MetadataUtils.getEC2InstanceRegion();

    DynamoDB getDynamoDBClient() {
        System.out.println("Creating a DynamoDB client");
        AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
                .withRegion(region)
                .build();
        return new DynamoDB(client);
     }

    DynamoDB getDaxClient(String daxEndpoint) {
        System.out.println("Creating a DAX client with cluster endpoint " + daxEndpoint);
        AmazonDaxClientBuilder daxClientBuilder = AmazonDaxClientBuilder.standard();
        daxClientBuilder.withRegion(region).withEndpointConfiguration(daxEndpoint);
        AmazonDynamoDB client = daxClientBuilder.build();
        return new DynamoDB(client);
     }

     void createTable(String tableName, DynamoDB client) {
        Table table = client.getTable(tableName);
        try {
            System.out.println("Attempting to create table; please wait...");

            table = client.createTable(tableName,
                    Arrays.asList(
                            new KeySchemaElement("pk", KeyType.HASH),   // Partition key
                            new KeySchemaElement("sk", KeyType.RANGE)), // Sort key
                    Arrays.asList(
                            new AttributeDefinition("pk", ScalarAttributeType.N),
                            new AttributeDefinition("sk", ScalarAttributeType.N)),
                    new ProvisionedThroughput(10L, 10L));
            table.waitForActive();
            System.out.println("Successfully created table.  Table status: " +
                    table.getDescription().getTableStatus());

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

    void writeData(String tableName, DynamoDB client, int pkmax, int skmax) {
        Table table = client.getTable(tableName);
        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 (Integer ipk = 1; ipk <= pkmax; ipk++) {
                System.out.println(("Writing " + skmax + " items for partition key: " + ipk));
                for (Integer isk = 1; isk <= skmax; isk++) {
                     table.putItem(new Item()
                             .withPrimaryKey("pk", ipk, "sk", isk)
                             .withString("someData", someData));
                }
            }
        } catch (Exception e) {
            System.err.println("Unable to write item:");
            e.printStackTrace();
        }
    }

    void deleteTable(String tableName, DynamoDB client) {
        Table table = client.getTable(tableName);
        try {
            System.out.println("\nAttempting to delete table; please wait...");
            table.delete();
            table.waitForDelete();
            System.out.println("Successfully deleted table.");

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

}

// snippet-end:[dynamodb.java.trydax.TryDaxHelper]