dynamodb.CrudOperationsOnDynamoDBTable.java Source code

Introduction

Here is the source code for dynamodb.CrudOperationsOnDynamoDBTable.java

Source

// Copyright 2012-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// Licensed under the Apache License, Version 2.0.
package dynamodb;

import java.util.ArrayList;
import java.util.Iterator;

import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient;
import com.amazonaws.services.dynamodbv2.document.DynamoDB;
import com.amazonaws.services.dynamodbv2.document.Table;
import com.amazonaws.services.dynamodbv2.document.TableCollection;
import com.amazonaws.services.dynamodbv2.model.AttributeDefinition;
import com.amazonaws.services.dynamodbv2.model.CreateTableRequest;
import com.amazonaws.services.dynamodbv2.model.KeySchemaElement;
import com.amazonaws.services.dynamodbv2.model.KeyType;
import com.amazonaws.services.dynamodbv2.model.ListTablesResult;
import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput;
import com.amazonaws.services.dynamodbv2.model.TableDescription;

public class CrudOperationsOnDynamoDBTable {

    static DynamoDB dynamoDB = new DynamoDB(new AmazonDynamoDBClient(new ProfileCredentialsProvider()));

    static String tableName = "ExampleTable";

    public static void main(String[] args) throws Exception {

        createExampleTable();
        listMyTables();
        getTableInformation();
        updateExampleTable();
        deleteExampleTable();
    }

    static void createExampleTable() {

        try {
            System.out.println("Creating table ...");
            ArrayList<AttributeDefinition> attributeDefinitions = new ArrayList<AttributeDefinition>();
            attributeDefinitions.add(new AttributeDefinition().withAttributeName("Id").withAttributeType("N"));

            ArrayList<KeySchemaElement> keySchema = new ArrayList<KeySchemaElement>();
            keySchema.add(new KeySchemaElement().withAttributeName("Id").withKeyType(KeyType.HASH)); //Partition key
            CreateTableRequest request = new CreateTableRequest().withTableName(tableName).withKeySchema(keySchema)
                    .withAttributeDefinitions(attributeDefinitions).withProvisionedThroughput(
                            new ProvisionedThroughput().withReadCapacityUnits(5L).withWriteCapacityUnits(6L));

            System.out.println("Issuing CreateTable request for " + tableName);
            Table table = dynamoDB.createTable(request);

            System.out.println("Waiting for " + tableName + " to be created...this may take a while...");
            table.waitForActive();
            System.out.println(tableName + " table activated successfully ...");
            getTableInformation();

        } catch (Exception e) {
            System.err.println("CreateTable request failed for " + tableName);
            System.err.println(e.getMessage());
        }

    }

    static void listMyTables() {

        TableCollection<ListTablesResult> tables = dynamoDB.listTables();
        Iterator<Table> iterator = tables.iterator();

        System.out.println("Listing table names");

        while (iterator.hasNext()) {
            Table table = iterator.next();
            System.out.println(table.getTableName());
        }
    }

    static void getTableInformation() {

        System.out.println("Describing " + tableName);

        TableDescription tableDescription = dynamoDB.getTable(tableName).describe();
        System.out.format(
                "Name: %s:\n" + "Status: %s \n" + "Provisioned Throughput (read capacity units/sec): %d \n"
                        + "Provisioned Throughput (write capacity units/sec): %d \n",
                tableDescription.getTableName(), tableDescription.getTableStatus(),
                tableDescription.getProvisionedThroughput().getReadCapacityUnits(),
                tableDescription.getProvisionedThroughput().getWriteCapacityUnits());
    }

    static void updateExampleTable() {

        Table table = dynamoDB.getTable(tableName);
        System.out.println("Modifying provisioned throughput for " + tableName);

        try {
            table.updateTable(new ProvisionedThroughput().withReadCapacityUnits(6L).withWriteCapacityUnits(7L));

            table.waitForActive();
        } catch (final Exception e) {
            System.err.println("UpdateTable request failed for " + tableName);
            System.err.println(e.getMessage());
        }
    }

    static void deleteExampleTable() {

        Table table = dynamoDB.getTable(tableName);
        try {
            System.out.println("Issuing DeleteTable request for " + tableName);
            table.delete();

            System.out.println("Waiting for " + tableName + " to be deleted...this may take a while...");

            table.waitForDelete();
        } catch (final Exception e) {
            System.err.println("DeleteTable request failed for " + tableName);
            System.err.println(e.getMessage());
        }
    }

}