code: public void retrieve(final String partitionKey, final String rowKey, final EntityResolver<?> resolver) {
          this.lockToPartitionKey(partitionKey);
          this.add(TableOperation.retrieve(partitionKey, rowKey, resolver));
      }
docs: Adds a table operation to retrieve an entity of the specified class type with the specified PartitionKey and
  RowKey to the batch operation.
  
  @param partitionKey
  A <code>String</code> containing the PartitionKey of the entity to retrieve.
  @param rowKey
  A <code>String</code> containing the RowKey of the entity to retrieve.
  @param resolver
  The {@link EntityResolver} implementation to project the entity to retrieve as a particular type in
  the result.