Package org.apache.ignite.table

Class ContinuousQueryOptions.Builder

java.lang.Object
org.apache.ignite.table.ContinuousQueryOptions.Builder
Enclosing class:
ContinuousQueryOptions
public static class ContinuousQueryOptions.Builder extends Object
Builder.

  • Constructor Details

    • Builder

      public Builder()

  • Method Details

    • pageSize

      public ContinuousQueryOptions.Builder pageSize(int pageSize)
      Sets the per-partition page size.

      Continuous Query polls every partition in a loop. This parameter controls the number of entries that will be requested from a single partition in one network call. Therefore, the maximum number of entries that the query may hold in memory at any given time is pageSize * partitions.

      Parameters:
      pageSize - Page size.
      Returns:
      This builder instance.

    • pollIntervalMs

      public ContinuousQueryOptions.Builder pollIntervalMs(int pollIntervalMs)
      Sets the poll interval in milliseconds.
      Parameters:
      pollIntervalMs - Poll interval in milliseconds.
      Returns:
      This builder instance.

    • eventTypes

      public ContinuousQueryOptions.Builder eventTypes(EnumSet<TableRowEventType> eventTypes)
      Sets the included event types.

      By default, all event types are included.

      Parameters:
      eventTypes - Included event types.
      Returns:
      This builder instance.

    • columnNames

      public ContinuousQueryOptions.Builder columnNames(@Nullable @Nullable Set<String> columnNames)
      Sets the column names to include in the result.

      By default, all columns are included. Excluding columns will reduce the amount of data transferred over the network.

      Excluded columns are still present in the resulting entries, but are set to null.

      Parameters:
      columnNames - Included column names. When null, all columns are included.
      Returns:
      This builder instance.

    • watermark

      public ContinuousQueryOptions.Builder watermark(@Nullable @Nullable ContinuousQueryWatermark watermark)
      Sets the starting watermark. When null, the query will start from the current time.

      Watermark can be obtained with ContinuousQueryWatermark.ofInstant(Instant), or from an event with TableRowEvent.watermark(). The latter allows resuming a query from a specific event (excluding said event, providing exactly-once semantics).

      Parameters:
      watermark - Watermark.
      Returns:
      This builder instance.

    • enableEmptyBatches

      public ContinuousQueryOptions.Builder enableEmptyBatches(boolean enableEmptyBatches)
      Sets the flag that indicates whether empty batches are enabled.

      When enabled, empty batches will be sent to the subscriber when there are no new events. This is useful for watermark updates (see TableRowEventBatch.watermark()).

      Parameters:
      enableEmptyBatches - True if empty batches are enabled, false otherwise.
      Returns:
      This builder instance.

    • build

      public ContinuousQueryOptions build()
      Builds the options.
      Returns:
      Continuous query options.