Dynamo DB

Archaius currently supports two different configurations for using Dynamo DB as a configuration source. One is a simple key value pair, in which you cannot have duplicate keys. The other makes use of deployment context so that you can specify overrides in what is currently a fairly limited way. The details of each are below:

Basic Configuration Source

Properties

In what probably amounts to overkill, these properties are themselves dynamic so you could change tables, etc on the fly if you wanted to.

Property	Description	Default Value
com.netflix.config.dynamo.tableName	Name of the dyanmo table with your properties	archaiusProperties
com.netflix.config.dynamo.keyAttributeName	Name of the attribute that contains the property Key	key
com.netflix.config.dynamo.valueAttributeName	Name of the attribute that contains the property Value	value

Table Setup

      KeySchemaElement key = new KeySchemaElement().withAttributeName("key").withAttributeType("S");
      KeySchema ks = new KeySchema().withHashKeyElement(key);
      
      // Provide the initial provisioned throughput values as Java long data types
      ProvisionedThroughput provisionedThroughput = new ProvisionedThroughput()
          .withReadCapacityUnits(1L)
          .withWriteCapacityUnits(1L);
      CreateTableRequest request = new CreateTableRequest()
          .withTableName(tableName)
          .withKeySchema(ks)
          .withProvisionedThroughput(provisionedThroughput);
      
      CreateTableResult result = client.createTable(request);

Creating a Configuration Source

You should do this in the bootstrap or initialization class for your application.

   //If you don't specify any credentials it should attempt to use the DefaultProviderChain
   private AmazonDynamoDB dynamo = new AmazonDynamoDBClient(awsCredentials);
   dynamo.setEndpoint(endpoint);

   private DynamoDbConfigurationSource source = new DynamoDbConfigurationSource(dynamo);
   private FixedDelayPollingScheduler scheduler = new FixedDelayPollingScheduler(0, pollFrequencySeconds.seconds.toInt, false);
   private DynamicConfiguration dynamicConfig = new DynamicConfiguration(source, scheduler);

   // add them in this order to make dynamicConfig override currentConfig
   finalConfig.addConfiguration(dynamicConfig);
   finalConfig.addConfiguration(currentConfig.asInstanceOf[AbstractConfiguration]);

   if (ConfigurationManager.isConfigurationInstalled) ConfigurationManager.loadPropertiesFromConfiguration(finalConfig)
   else ConfigurationManager.install(finalConfig);

Deployment Context Aware Configuration Source

In what probably amounts to overkill, these properties are themselves dynamic so you could change tables, etc on the fly if you wanted to.

Property	Description	Default Value
com.netflix.config.dynamo.tableName	Name of the dyanmo table with your properties	archaiusProperties
com.netflix.config.dynamo.keyAttributeName	Name of the attribute that contains the property Key	key
com.netflix.config.dynamo.valueAttributeName	Name of the attribute that contains the property Value	value
com.netflix.config.dynamo.contextKeyAttributeName	Name of the attribute that contains the contextKey	contextKey
com.netflix.config.dynamo.contextValueAttributeName	Name of the attribut that contains the contextValue	contextValue

Table Setup

      KeySchemaElement key = new KeySchemaElement().withAttributeName("key").withAttributeType("S");
      KeySchemaElement range = new KeySchemaElement().withAttributeName("contextKey").withAttributeType("S");

      KeySchema ks = new KeySchema().withHashKeyElement(hashKey).withRangeKeyElement(range);
      
      // Provide the initial provisioned throughput values as Java long data types
      ProvisionedThroughput provisionedThroughput = new ProvisionedThroughput()
          .withReadCapacityUnits(1L)
          .withWriteCapacityUnits(1L);
      CreateTableRequest request = new CreateTableRequest()
          .withTableName(tableName)
          .withKeySchema(ks)
          .withProvisionedThroughput(provisionedThroughput);
      
      CreateTableResult result = client.createTable(request);

Creating a Configuration Source

You should do this in the bootstrap or initialization class for your application.

 //If you don't specify any credentials it should attempt to use the DefaultProviderChain
 private AmazonDynamoDB dynamo = new AmazonDynamoDBClient(awsCredentials);
 dynamo.setEndpoint(endpoint);

 private DynamoDbConfigurationSource source = new DynamoDbConfigurationSource(dynamo);
 private FixedDelayPollingScheduler scheduler = new FixedDelayPollingScheduler(0, pollFrequencySeconds.seconds.toInt, false);
 private DynamicConfiguration dynamicConfig = new DynamicConfiguration(source, scheduler);

 // add them in this order to make dynamicConfig override currentConfig
 finalConfig.addConfiguration(dynamicConfig);
 finalConfig.addConfiguration(currentConfig.asInstanceOf[AbstractConfiguration]);

 if (ConfigurationManager.isConfigurationInstalled) ConfigurationManager.loadPropertiesFromConfiguration(finalConfig)
 else ConfigurationManager.install(finalConfig);

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