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Amazon DynamoDB
Developer Guide (API Version 2012-08-10)

TryDax.java

The TryDax.java file contains the main method. If you run the program with no command line parameters, it creates a DynamoDB client and uses that client for all API operations. If you specify a DAX cluster endpoint on the command line, the program also creates a DAX client and uses it for GetItem, Query and Scan operations.

You can modify the program in several ways. For example:

  • Use the DAX client instead of the DynamoDB client (see Step 4: Run the Sample Application).

  • Choose a different name for the test table.

  • Modify the number of items written by changing the helper.writeData parameters. The second parameter is the number of partition keys, and the third parameter is the number of sort keys. By default, the program uses 1-10 for partition key values, and 1-10 for sort key values, for a total of 100 items written to the table. (For more information, see TryDaxHelper.java)

  • Modify the number of GetItem, Query and Scan tests, and modify their parameters.

  • Comment out the lines containing helper.createTable and helper.deleteTable (if you do not want to create and delete the table each time you run the program).

Note

To run this program, you must include both the DAX Java client and the AWS SDK for Java in your classpath. See Step 4: Run the Sample Application for an example of setting your CLASSPATH variable.

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import com.amazonaws.services.dynamodbv2.document.DynamoDB; public class TryDax { public static void main(String[] args) throws Exception { TryDaxHelper helper = new TryDaxHelper(); TryDaxTests tests = new TryDaxTests(); DynamoDB ddbClient = helper.getDynamoDBClient(); DynamoDB daxClient = null; if (args.length >= 1) { daxClient = helper.getDaxClient(args[0]); } String tableName = "TryDaxTable"; System.out.println("Creating table..."); helper.createTable(tableName, ddbClient); System.out.println("Populating table..."); helper.writeData(tableName, ddbClient, 10, 10); DynamoDB testClient = null; if (daxClient != null) { testClient = daxClient; } else { testClient = ddbClient; } System.out.println("Running GetItem, Scan, 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 tests.getItemTest(tableName, testClient, 1, 10, 5); // Query tests.queryTest(tableName, testClient, 5, 2, 9, 5); // Scan tests.scanTest(tableName, testClient, 5); helper.deleteTable(tableName, ddbClient); } }