All Classes and Interfaces

Class	Description
Action	Action types recorded in HistoryRecord.
AddSignOperation	Add-sign action — appends additional approvers to the current step (v4 §8.5).
ApproveOperation	Approve action — marks the caller's task DONE+APPROVED, evaluates the step and either advances the instance (next step / END) or stays put for further approvals (v4 §8.2 / §8.3).
Assignee	Participant descriptor on a step.
AssigneeResolver	Resolves an assignee declaration into a concrete list of user IDs.
AssigneeType	Type discriminator of an Assignee.
BaseObservabilityFlowMetrics	FlowMetrics adapter that forwards every event into a MetricRegistry from opencode-base-observability.
CirculateOperation	Circulate (read-only notification) action — appends a history row and publishes a TaskCirculatedEvent; does not affect the workflow state (v4 §8.8).
Comment	Immutable comment attached to a task action.
ConcurrentFlowModificationException	Thrown on optimistic-lock version conflict during a concurrent update.
CurrentUserProvider	Supplies the current request's acting user id.
DefaultFlowDefinitionService	Default FlowDefinitionService backed by the supplied FlowRepository, DslParser, and DslValidator.
DefaultFlowInstanceService	Default FlowInstanceService implementation.
DefaultHistoryService	Default HistoryService implementation — delegates to the repository with an optional engine-side authorisation check.
DefaultTaskService	Default TaskService implementation.
DslParseException	Thrown when the JSON DSL fails structural or semantic validation.
DslParser	JSON DSL → FlowDefinition parser (v4 §4, §11).
DslValidator	Semantic / quota validator for parsed FlowDsl documents.
ExpressionEvaluator	Expression-evaluation SPI (optional).
FlowCompletedEvent	Domain event raised when a FlowInstance reaches a terminal status (InstanceStatus.COMPLETED / InstanceStatus.TERMINATED / InstanceStatus.WITHDRAWN).
FlowContext	Read-only context passed to every SPI implementation (AssigneeResolver, ExpressionEvaluator).
FlowDefinition	Deployed flow definition (immutable view of flow_definition row + parsed DSL).
FlowDefinitionException	Thrown when flow definition deployment or version management fails.
FlowDefinitionService	Flow-definition facade: deploy, list, deprecate.
FlowDsl	Raw JSON DSL top-level structure (v4 §4.1).
FlowDsl.AssigneeDsl	Single DSL assignee record.
FlowDsl.StepDsl	Single DSL step record (mirrors JSON object literally).
FlowDsl.TransitionDsl	Single DSL transition record.
FlowErrorCode	Catalogue of stable error codes for the opencode-base-flow module. opencode-base-flow 模块的稳定错误码目录。
FlowEventBusBridge	Cross-package bridge into the package-private FlowEventBus so the operation/ package can publish domain events without exposing the underlying bus type.
FlowException	Base exception for the opencode-base-flow module. opencode-base-flow 模块的异常基类。
FlowInstance	Running flow instance (mirrors flow_instance row).
FlowInstanceNotFoundException	Thrown when a flow instance lookup by id returns no row.
FlowInstanceService	Flow-instance facade: start, get, list, terminate.
FlowMetrics	Engine-facing metrics façade — v4 §9.1.
FlowMetricsFactory	Factory for FlowMetrics that auto-detects whether the optional opencode-base-observability module is available on the runtime classpath.
FlowRepository	Unified persistence contract for the flow engine; backed by either InMemoryFlowRepository (tests / demos) or JdbcFlowRepository (production, S4).
FlowStartedEvent	Domain event raised when a FlowInstance is started.
FlowStatus	Lifecycle status of a FlowDefinition.
H2Dialect	H2 database dialect (primary CI / contract-test backend).
HistoryRecord	Single immutable history entry (mirrors flow_history row).
HistoryService	History-timeline facade.
HistoryWriter	Internal append-only writer for HistoryRecords.
IllegalActionException	Thrown when an action is rejected by the engine's state machine.
InMemoryFlowRepository	Thread-safe, in-memory FlowRepository for unit tests, integration tests, and short-lived demos.
InputSanitizer	Package-private utility that sanitises and validates user-supplied text fields (comment / reason / userId) before the engine persists them, per design v4 §7.3.
InstanceStatus	Lifecycle status of a FlowInstance.
JdbcDialect	Vendor abstraction over the small set of column-type / SQL fragments that differ between MySQL, PostgreSQL and H2.
JdbcFlowRepository	JDBC-backed FlowRepository for MySQL, PostgreSQL and H2.
JsonExtrasBridge	Cross-package bridge into the package-private JsonExtras helper, so the operation/ package can serialise extra_json payloads without exposing the underlying helper type.
MySqlDialect	MySQL / MariaDB dialect.
NoOpFlowMetrics	Zero-cost default FlowMetrics — every method is an empty body.
PostgresDialect	PostgreSQL dialect.
RejectOperation	Reject action — v4 §8.4: targetStepId = "_INITIATOR_" → rollback to steps[0], cancel pending tasks, re-enter step 0 targetStepId = null → go to the previous approve/vote step inferred from history otherwise → must be a step id visited in history; jump there 驳回操作 —— 详见 v4 §8.4。
Step	Step (node) definition inside a FlowDefinition.
StepEntry	Shared helper that materialises a Step into one or more PENDING Task rows for an existing FlowInstance.
StepEvaluator	Evaluates whether a given Step has reached its terminal state given the current set of Tasks and VoteRecords in the repository.
StepEvaluator.StepEvaluation	Three-valued evaluation result.
StepType	Step (node) type.
Strategy	Approval / vote strategy that determines how a multi-assignee step decides "approved" / "rejected".
Task	Current or historical task (mirrors flow_task row).
TaskCirculatedEvent	Domain event raised when a task is circulated (read-only notification).
TaskNotFoundException	Thrown when a task lookup by id returns no row.
TaskOutcome	Outcome of a completed Task.
TaskService	Task-centric facade exposing the seven approval operations + todo / lookup.
TaskStatus	Lifecycle status of a Task.
TransferOperation	Transfer action — changes the assignee of a PENDING task (v4 §8.7).
Transition	Approval-path edge between two steps.
TransitionResolver	Resolves "where to go next" given a FlowDefinition and the current step, plus locates a sensible "previous approve / vote" target for reject.
VoteOperation	Vote action — records the user's vote, marks task DONE+APPROVED (i.e.
VoteOpinion	Vote opinion submitted at a StepType.VOTE step.
VoteRecord	Single vote cast at a StepType.VOTE step (mirrors flow_vote_record row).
WithdrawOperation	Withdraw action (v4 §8.6).