Decorators

cloudify.decorators.operation(func=None, resumable=False, **kwargs)

This decorator is not required for operations to work.

Use this for readability, and to add additional markers for the function (eg. is it resumable).

cloudify.decorators.workflow(func=None, system_wide=False, resumable=False, **kwargs)

This decorator should only be used to decorate system wide workflows. It is not required for regular workflows.

cloudify.decorators.serial_operation(threshold=0, workflows=None, states=None, **op_kwargs)

Control order of multiple node instances of a single node template.

Normally, multiple node instance operations will be executed in parallel. However, some cases, like clusters require that cluster members are installed serially.

Parameters:

• threshold – Switch back to parallel execution after n node instances. Integer. 0: Never use parallel. Always straight serial. 1: After 1 node is installed, return to Parallel. Default. n + 1: After n node instances.

• workflows – List of workflows to apply serialization to. The default is [‘install’]. This means we scale will execute in parallel.

• states – List of states that the preceding node instance may be in before executing the current node instance. The default is [‘started’]. We will only continue to next instance after the preceding instance is in “started” state.

Raises:

CloudifySerializationRetry.

Returns:

decorator wrapper