Package com.illumon.iris.db.v2.locations

Class TableLocationStateHolder

java.lang.Object
com.illumon.iris.db.v2.locations.TableLocationStateHolder
All Implemented Interfaces:
TableLocationState
Direct Known Subclasses:
CheckpointRecord
public class TableLocationStateHolder
extends Object
implements TableLocationState
Tool for generic multi-field "atomic" get/set of state values for a table location. NB: Possibly-concurrent usages should be externally synchronized.

  • Constructor Details

  • Method Details

    • getStateLock

      @NotNull public final Object getStateLock()
      Specified by:
      getStateLock in interface TableLocationState
      Returns:
      The Object that accessors should synchronize on if they want to invoke multiple getters with consistent results.

    • getSize

      public final long getSize()
      Specified by:
      getSize in interface TableLocationState
      Returns:
      The size of a table location:
      NULL_SIZE : Size information is unknown or does not exist for this table location
      >= 0 : The table location exists and has (possibly empty) data

    • getLastModifiedTimeMillis

      public final long getLastModifiedTimeMillis()
      Specified by:
      getLastModifiedTimeMillis in interface TableLocationState
      Returns:
      The last modified time for a table location, in milliseconds from the epoch:
      NULL_TIME : Modification time information is unknown or does not exist for this table location
      >= 0L : The time this table was last modified, in milliseconds from the UTC epoch

    • clearValues

      protected final void clearValues()
      Clear this holder, by reinitializing all fields to their "null" equivalents.

    • setValues

      public final boolean setValues​(long size, long lastModifiedTimeMillis)
      Set all state values.
      Parameters:
      size - The new size
      lastModifiedTimeMillis - The new modification time
      Returns:
      Whether any of the values changed

    • readValuesFrom

      public final boolean readValuesFrom​(@NotNull DataInput input) throws IOException
      Read all values from the supplied input into this state holder.
      Parameters:
      input - A input to read from
      Returns:
      Whether any of the values changed
      Throws:
      IOException