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    Interface AnyValue<Value>

    Stores the last value received, assumes that if multiple values are received, they are all equal.

    Note: Unlike 'LastValue' if multiple nodes write to this channel in a single step, the values will be continuously overwritten.

    interface AnyValue<Value> {
        lc_graph_name: string;
        UpdateType: Value;
        value: [] | [Value];
        ValueType: Value;
        checkpoint(): Value;
        consume(): boolean;
        finish(): boolean;
        fromCheckpoint(checkpoint?: Value): AnyValue<Value>;
        get(): Value;
        isAvailable(): boolean;
        update(values: Value[]): boolean;
    }

    Type Parameters

    • Value
    Index

    Properties

    lc_graph_name UpdateType value ValueType

    Methods

    checkpoint consume finish fromCheckpoint get isAvailable update

    Properties

    lc_graph_name: string = "AnyValue"

    The name of the channel.

    UpdateType: Value
    value: [] | [Value] = []
    ValueType: Value

    Methods

    • Return a string representation of the channel's current state.

      Returns Value

      if the channel is empty (never updated yet), or doesn't support checkpoints.

    • Mark the current value of the channel as consumed. By default, no-op. A channel can use this method to modify its state, preventing the value from being consumed again.

      Returns True if the channel was updated, False otherwise.

      Returns boolean

    • Notify the channel that the Pregel run is finishing. By default, no-op. A channel can use this method to modify its state, preventing finish.

      Returns True if the channel was updated, False otherwise.

      Returns boolean

    • Return a new identical channel, optionally initialized from a checkpoint. Can be thought of as a "restoration" from a checkpoint which is a "snapshot" of the channel's state.

      Parameters

      • Optionalcheckpoint: Value

      Returns AnyValue<Value>

    • Return the current value of the channel.

      Returns Value

      if the channel is empty (never updated yet).

    • Return True if the channel is available (not empty), False otherwise. Subclasses should override this method to provide a more efficient implementation than calling get() and catching EmptyChannelError.

      Returns boolean

    • Update the channel's value with the given sequence of updates. The order of the updates in the sequence is arbitrary. This method is called by Pregel for all channels at the end of each step. If there are no updates, it is called with an empty sequence.

      Raises InvalidUpdateError if the sequence of updates is invalid. Returns True if the channel was updated, False otherwise.

      Parameters

      Returns boolean

      if the sequence of updates is invalid.

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