A precondition to check that data exists in a DynamoDB table.
A precondition to check that the DynamoDB table exists.
Checks whether a data node object exists.
The base trait of all preconditions.
Checks whether a key exists in an Amazon S3 data node.
A precondition to check that the Amazon S3 objects with the given prefix (represented as a URI) are present.
A Unix/Linux shell command that can be run as a precondition.
The base trait of all preconditions.
A precondition is a condition that must be met before the object can run. The activity cannot run until all its conditions are met.