Workflow Lifecycle

The lifecycle of a workflow consists of a set of states in which a workflow can be, as well as the transitions between the states.

Lifecycle diagram

The following diagram shows the lifecycle of a workflow, including the states and transitions between them. Note the following conventions:

• States are represented by rectangles. A description of the state is provided in the states section (below).
• Transitions are of the form state1 --> state2 : [_actor/component_, EventType | _attribute/result_].

stateDiagram-v2
    classDef goodState stroke:green
    classDef warningState stroke:orange
    classDef badState stroke:red

    [*] --> NEW : [Start]
    NEW --> VALID : [Validate | _valid_]
    NEW --> FAILED_SAFE : [Validate | _invalid_]
    VALID --> READY : [Conditions | _true_]
    VALID --> BLOCKED_WAITING: [Conditions | _false_]
    BLOCKED_WAITING --> READY : [Conditions | _true_]
    READY --> RESOURCE_DISCOVERY : [Discover]
    RESOURCE_DISCOVERY --> RESOURCES_DISCOVERED: [Discovered | _resources_]
    RESOURCES_DISCOVERED --> SCHEDULED : [Lock]
    RESOURCE_DISCOVERY --> FAILED_SAFE: [Discovered | _error_]
    SCHEDULED --> LOCKING : [Lock]
    LOCKING --> LOCKED : [Run]
    LOCKING --> SCHEDULED : [Unlock | _error_]
    LOCKED --> RUNNING : [Run]
    RUNNING --> ERROR: [error | _error_]
    RUNNING --> ERROR: [timeout | _error_]
    ERROR --> ROLLBACK: [canRollback | yes]
    ROLLBACK --> FAILED_SAFE: [success | yes]
    ROLLBACK --> FAILED_UNSAFE: [success | no]
    ERROR --> FAILED_UNSAFE: [canRollback | no]
    RUNNING --> COMPLETED: [success | _success_]    
    FAILED_UNSAFE --> FAILED_SAFE : [Rollback | _success_]
    FAILED_SAFE --> FAILED_SAFE_ACK 
    FAILED_UNSAFE --> FAILED_UNSAFE_ACK 
    COMPLETED --> COMPLETED_ACK 
    FAILED_SAFE_ACK --> [*]
    FAILED_UNSAFE_ACK --> [*]
    COMPLETED_ACK --> [*]

    class NEW goodState
    class READY goodState
    class VALID goodState
    class LOCKING goodState
    class LOCKED goodState
    class BLOCKED_WAITING goodState 
    class RESOURCE_DISCOVERY goodState
    class RESOURCES_DISCOVERED goodState
    class SCHEDULED goodState
    class RUNNING goodState
    class COMPLETED goodState
    class COMPLETED_ACK goodState
    class FAILED_SAFE warningState
    class ERROR warningState
    class ROLLBACK warningState
    class FAILED_UNSAFE badState
    class FAILED_UNSAFE_ACK badState
    class FAILED_SAFE_ACK warningState

States

NEW

Actions

Actions are the operations that alter the state of a workflow, eventually leading to a terminal state (COMPLETED or FAILED).

Start