com.hazelcast.jet.core

## Class Partitioner.Default

- java.lang.Object
- - com.hazelcast.jet.core.Partitioner.Default

- All Implemented Interfaces:
    Partitioner<Object>, Serializable
  Enclosing interface:
    Partitioner<T>

      public static final class Partitioner.Default
      extends Object
      implements Partitioner<Object>

  Partitioner which applies the default Hazelcast partitioning strategy. Instances should be retrieved from `Partitioner.defaultPartitioner()`.
  See Also:
    Serialized Form

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface com.hazelcast.jet.core.Partitioner

      `Partitioner.Default`

  - ### Field Summary

    - ### Fields inherited from interface com.hazelcast.jet.core.Partitioner

      `HASH_CODE`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getPartition(Object item, int partitionCount)` Returns the partition ID of the given item.
    `void` | `init(DefaultPartitionStrategy defaultPartitioning)` Callback that injects the Hazelcast's default partitioning strategy into this partitioner so it can be consulted by the `Partitioner.getPartition(Object, int)` method.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface com.hazelcast.jet.core.Partitioner

      `defaultPartitioner`

- - ### Method Detail

    - #### init

          public void init(@Nonnull
                           DefaultPartitionStrategy defaultPartitioning)

      Description copied from interface: `Partitioner`
      Callback that injects the Hazelcast's default partitioning strategy into this partitioner so it can be consulted by the `Partitioner.getPartition(Object, int)` method.

      The creation of instances of the `Partitioner` type is done in user's code, but the Hazelcast partitioning strategy only becomes available after the partitioner is deserialized on each target member. This method solves the lifecycle mismatch.

      Specified by:
        `init` in interface `Partitioner<Object>`

    - #### getPartition

          public int getPartition(@Nonnull
                                  Object item,
                                  int partitionCount)

      Description copied from interface: `Partitioner`
      Returns the partition ID of the given item.
      Specified by:
        `getPartition` in interface `Partitioner<Object>`
        `partitionCount` - the total number of partitions in use by the underlying Hazelcast instance

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