DocumentAPITableExample.java

/*
* Copyright 2014-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* 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
*
* or in the "license" file accompanying this file. 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.
*/
package com.amazonaws.codesamples.document;

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 DocumentAPITableExample {

    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 {

            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));

            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();

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

}