Building Serverless Architectures

Configuring environment variables for Lambda

We can implement this functionality in the repository-dynamodb module now. First of all, we have to remind you that all DynamoDB operations are carried out by an instance of com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper. This class is extendable and configurable. One of the configurations is a table name resolver class that implements the com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperConfig.TableNameResolver interface. What we are going to do is create a child class for DynamoDBMapper, configure it with our own table resolver, EnvironmentVariableTableNameResolver, and inject our own implementation of DynamoDBMapper wherever we need an instance of DynamoDBMapper.