# Package org.activiti.engine.runtime

Classes related to the `RuntimeService`.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  Clock | This interface provides full access to the clock
  ClockReader | This interface provides clock reading functionality
  Execution | Represent a 'path of execution' in a process instance.
  ExecutionQuery | Allows programmatic querying of `Execution`s.
  Job | Represents one job (timer, message, etc.).
  JobQuery | Allows programmatic querying of `Job`s.
  NativeExecutionQuery | Allows querying of `Execution`s via native (SQL) queries
  NativeProcessInstanceQuery | Allows querying of `ProcessInstance`s via native (SQL) queries
  ProcessInstance | Represents one execution of a `ProcessDefinition`.
  ProcessInstanceBuilder | Helper for starting new ProcessInstance.
  ProcessInstanceQuery | Allows programmatic querying of `ProcessInstance`s.

## Package org.activiti.engine.runtime Description

Classes related to the `RuntimeService`.

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