# Uses of Package
org.activiti.engine.history

- Packages that use org.activiti.engine.history
  Package | Description
  --- | ---
  org.activiti.engine | Public API of the Activiti engine. Typical usage of the API starts by the creation of a `ProcessEngineConfiguration` (typically based on a configuration file), from which a `ProcessEngine` can be obtained. Through the services obtained from such a `ProcessEngine`, BPM and workflow operation can be executed: `RepositoryService`: Manages `Deployment`s `RuntimeService`: For starting and searching `ProcessInstance`s `TaskService`: Exposes operations to manage human (standalone) `Task`s, such as claiming, completing and assigning tasks `IdentityService`: Used for managing `User`s, `Group`s and the relations between them `ManagementService`: Exposes engine admin and maintenance operations, which have no relation to the runtime exection of business processes `HistoryService`: Exposes information about ongoing and past process instances. `FormService`: Access to form data and rendered forms for starting new process instances and completing tasks.
  org.activiti.engine.history | Classes related to the `HistoryService`.
  org.activiti.engine.task | Classes related to the `TaskService`.

- Classes in org.activiti.engine.history used by org.activiti.engine
  Class and Description
  HistoricActivityInstanceQuery Programmatic querying for `HistoricActivityInstance`s.
  HistoricDetailQuery Programmatic querying for `HistoricDetail`s.
  HistoricIdentityLink Historic counterpart of `IdentityLink` that represents the current state if any runtime link.
  HistoricProcessInstanceQuery Allows programmatic querying of `HistoricProcessInstance`s.
  HistoricTaskInstanceQuery Allows programmatic querying for `HistoricTaskInstance`s.
  HistoricVariableInstanceQuery Programmatic querying for `HistoricVariableInstance`s.
  NativeHistoricActivityInstanceQuery Allows querying of `HistoricActivityInstanceQuery`s via native (SQL) queries
  NativeHistoricDetailQuery Allows querying of `HistoricDetail`s via native (SQL) queries
  NativeHistoricProcessInstanceQuery Allows querying of `HistoricTaskInstanceQuery`s via native (SQL) queries
  NativeHistoricTaskInstanceQuery Allows querying of `HistoricTaskInstanceQuery`s via native (SQL) queries
  NativeHistoricVariableInstanceQuery Allows querying of `HistoricVariableInstance`s via native (SQL) queries
  ProcessInstanceHistoryLogQuery Allows to fetch the `ProcessInstanceHistoryLog` for a process instance.

- Classes in org.activiti.engine.history used by org.activiti.engine.history
  Class and Description
  HistoricActivityInstanceQuery Programmatic querying for `HistoricActivityInstance`s.
  HistoricData
  HistoricDetail Base class for all kinds of information that is related to either a `HistoricProcessInstance` or a `HistoricActivityInstance`.
  HistoricDetailQuery Programmatic querying for `HistoricDetail`s.
  HistoricProcessInstanceQuery Allows programmatic querying of `HistoricProcessInstance`s.
  HistoricTaskInstanceQuery Allows programmatic querying for `HistoricTaskInstance`s.
  HistoricVariableInstanceQuery Programmatic querying for `HistoricVariableInstance`s.
  ProcessInstanceHistoryLog A trail of data for a given process instance.
  ProcessInstanceHistoryLogQuery Allows to fetch the `ProcessInstanceHistoryLog` for a process instance.

- Classes in org.activiti.engine.history used by org.activiti.engine.task
  Class and Description
  HistoricData

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