Class SequentialPlanner

java.lang.Object
dev.langchain4j.agentic.workflow.impl.SequentialPlanner
All Implemented Interfaces:
Planner
public class SequentialPlanner extends Object implements Planner

  • Constructor Details

    • SequentialPlanner

      public SequentialPlanner()

  • Method Details

    • init

      public void init(InitPlanningContext initPlanningContext)
      Specified by:
      init in interface Planner

    • nextAction

      public Action nextAction(PlanningContext planningContext)
      Description copied from interface: Planner
      Determines the next action to execute based on the result of the previous agent invocation.
      Specified by:
      nextAction in interface Planner
      Parameters:
      planningContext - the current planning context, including the previous agent's result
      Returns:
      the next action to execute

    • topology

      public AgenticSystemTopology topology()
      Description copied from interface: Planner
      Returns the topology of the agentic system managed by this planner.
      Specified by:
      topology in interface Planner
      Returns:
      the topology (defaults to AgenticSystemTopology.SEQUENCE)

    • terminated

      public boolean terminated()
      Description copied from interface: Planner
      Returns true if the planner has reached a terminal state and will not produce further actions.
      Specified by:
      terminated in interface Planner
      Returns:
      true if the planner is terminated

    • executionState

      public Map<String,Object> executionState()
      Description copied from interface: Planner
      Returns the planner's current execution state as a map of serializable values. This state is persisted to the AgenticScope after each agent invocation, enabling the planner to resume from the correct position after a crash.

      The returned state must be such that, when passed to Planner.restoreExecutionState(Map) and Planner.firstAction(PlanningContext) is called, the planner produces the correct resume action.

      Stateless planners (e.g., parallel, conditional) can use the default empty implementation.

      Specified by:
      executionState in interface Planner
      Returns:
      a map of state entries to persist, or an empty map if no state needs saving

    • restoreExecutionState

      public void restoreExecutionState(Map<String,Object> state)
      Description copied from interface: Planner
      Restores the planner's execution state from a previously saved map. Called by the execution loop before Planner.firstAction(PlanningContext) when recovering from a persisted scope.
      Specified by:
      restoreExecutionState in interface Planner
      Parameters:
      state - the previously saved execution state