AbstractJob.MappingJobImpl (Hazelcast Root 3.9.4 API)

java.lang.Object
- com.hazelcast.mapreduce.impl.AbstractJob.MappingJobImpl<EntryKey,Key,Value>

Type Parameters:

EntryKey - type of the original base key

Key - type of the key at that processing state

Value - type of the value at that processing state

All Implemented Interfaces:

MappingJob<EntryKey,Key,Value>

Enclosing class:

AbstractJob<KeyIn,ValueIn>
```
protected class AbstractJob.MappingJobImpl<EntryKey,Key,Value>
extends Object
implements MappingJob<EntryKey,Key,Value>
```
This class is just used to comply to the public DSL style API

Constructor Summary

Constructors
Modifier Constructor and Description

protected MappingJobImpl()

Constructors
Modifier	Constructor and Description
`protected`	`MappingJobImpl()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`MappingJob<EntryKey,Key,Value>`	`chunkSize(int chunkSize)` Defines the number of elements per chunk.
`<ValueOut> ReducingJob<EntryKey,Key,ValueOut>`	`combiner(CombinerFactory<? super Key,? super Value,? extends ValueOut> combinerFactory)` Defines the `CombinerFactory` for this task.
`MappingJob<EntryKey,Key,Value>`	`keyPredicate(KeyPredicate<? super EntryKey> predicate)` Defines the `KeyPredicate` implementation to preselect keys that the MapReduce task will be executed on.
`MappingJob<EntryKey,Key,Value>`	`onKeys(EntryKey... keys)` Defines keys to execute the mapper and a possibly defined reducer against.
`MappingJob<EntryKey,Key,Value>`	`onKeys(Iterable<? extends EntryKey> keys)` Defines keys to execute the mapper and a possibly defined reducer against.
`<ValueOut> ReducingSubmittableJob<EntryKey,Key,ValueOut>`	`reducer(ReducerFactory<? super Key,? super Value,? extends ValueOut> reducerFactory)` Defines the `ReducerFactory` for this task.
`JobCompletableFuture<Map<Key,List<Value>>>`	`submit()` Submits the task to Hazelcast and executes the defined mapper and reducer on all cluster nodes.
`<ValueOut> JobCompletableFuture<ValueOut>`	`submit(Collator<Map.Entry<Key,List<Value>>,ValueOut> collator)` Submits the task to Hazelcast, executes the defined mapper and reducer on all cluster nodes, and executes the collator before returning the final result.
`MappingJob<EntryKey,Key,Value>`	`topologyChangedStrategy(TopologyChangedStrategy topologyChangedStrategy)` Defines the strategy to handle topology changes while executing the map reduce job.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MappingJobImpl
```
protected MappingJobImpl()
```
- Method Detail
  - onKeys
```
public MappingJob<EntryKey,Key,Value> onKeys(Iterable<? extends EntryKey> keys)
```
    Description copied from interface: MappingJob
    
    Defines keys to execute the mapper and a possibly defined reducer against. If keys are known before submitting the task, setting them can improve execution speed.
    
    Specified by:
    
    onKeys in interface MappingJob<EntryKey,Key,Value>
    
    Parameters:
    
    keys - keys to be executed against
    
    Returns:
    
    instance of this Job with generics changed on usage
  - onKeys
```
public MappingJob<EntryKey,Key,Value> onKeys(EntryKey... keys)
```
    Description copied from interface: MappingJob
    
    Defines keys to execute the mapper and a possibly defined reducer against. If keys are known before submitting the task, setting them can improve execution speed.
    
    Specified by:
    
    onKeys in interface MappingJob<EntryKey,Key,Value>
    
    Parameters:
    
    keys - keys to be executed against
    
    Returns:
    
    instance of this Job with generics changed on usage
  - keyPredicate
```
public MappingJob<EntryKey,Key,Value> keyPredicate(KeyPredicate<? super EntryKey> predicate)
```
    Description copied from interface: MappingJob
    
    Defines the KeyPredicate implementation to preselect keys that the MapReduce task will be executed on. Preselecting keys can speed up the job massively.
    This method can be used in conjunction with MappingJob.onKeys(Iterable) or MappingJob.onKeys(Object...) to define a range of known and evaluated keys.
    
    Specified by:
    
    keyPredicate in interface MappingJob<EntryKey,Key,Value>
    
    Parameters:
    
    predicate - predicate implementation to be used to evaluate keys
    
    Returns:
    
    instance of this Job with generics changed on usage
  - chunkSize
```
public MappingJob<EntryKey,Key,Value> chunkSize(int chunkSize)
```
    Description copied from interface: MappingJob
    
    Defines the number of elements per chunk. Whenever the chunk size is reached and a ReducerFactory is defined, the chunk will be sent to the nodes that are responsible for the emitted keys.
    Please note, that chunks are deactivated when no ReducerFactory is defined
    
    Specified by:
    
    chunkSize in interface MappingJob<EntryKey,Key,Value>
    
    Parameters:
    
    chunkSize - the number of elements per chunk
    
    Returns:
    
    instance of this Job with generics changed on usage
  - topologyChangedStrategy
```
public MappingJob<EntryKey,Key,Value> topologyChangedStrategy(TopologyChangedStrategy topologyChangedStrategy)
```
    Description copied from interface: MappingJob
    
    Defines the strategy to handle topology changes while executing the map reduce job. For further information see TopologyChangedStrategy.
    
    Specified by:
    
    topologyChangedStrategy in interface MappingJob<EntryKey,Key,Value>
    
    Parameters:
    
    topologyChangedStrategy - strategy to use
    
    Returns:
    
    instance of this Job with generics changed on usage
  - combiner
```
public <ValueOut> ReducingJob<EntryKey,Key,ValueOut> combiner(CombinerFactory<? super Key,? super Value,? extends ValueOut> combinerFactory)
```
    Description copied from interface: MappingJob
    
    Defines the CombinerFactory for this task. This method is not idempotent and is callable only one time. Further calls result in an IllegalStateException thrown telling you to not change the internal state.
    
    Specified by:
    
    combiner in interface MappingJob<EntryKey,Key,Value>
    
    Type Parameters:
    
    ValueOut - type of the combined value
    
    Parameters:
    
    combinerFactory - CombinerFactory to build Combiner
    
    Returns:
    
    instance of this Job with generics changed on usage
  - reducer
```
public <ValueOut> ReducingSubmittableJob<EntryKey,Key,ValueOut> reducer(ReducerFactory<? super Key,? super Value,? extends ValueOut> reducerFactory)
```
    Description copied from interface: MappingJob
    
    Defines the ReducerFactory for this task. This method is not idempotent and is callable only one time. Further calls result in an IllegalStateException thrown telling you to not change the internal state.
    
    Specified by:
    
    reducer in interface MappingJob<EntryKey,Key,Value>
    
    Type Parameters:
    
    ValueOut - type of the reduced value
    
    Parameters:
    
    reducerFactory - ReducerFactory to build Reducers
    
    Returns:
    
    instance of this Job with generics changed on usage
  - submit
```
public JobCompletableFuture<Map<Key,List<Value>>> submit()
```
    Description copied from interface: MappingJob
    
    Submits the task to Hazelcast and executes the defined mapper and reducer on all cluster nodes.
    
    Specified by:
    
    submit in interface MappingJob<EntryKey,Key,Value>
    
    Returns:
    
    JobCompletableFuture to wait for mapped and possibly reduced result
  - submit
```
public <ValueOut> JobCompletableFuture<ValueOut> submit(Collator<Map.Entry<Key,List<Value>>,ValueOut> collator)
```
    Description copied from interface: MappingJob
    
    Submits the task to Hazelcast, executes the defined mapper and reducer on all cluster nodes, and executes the collator before returning the final result.
    
    Specified by:
    
    submit in interface MappingJob<EntryKey,Key,Value>
    
    Type Parameters:
    
    ValueOut - type of the collated value
    
    Parameters:
    
    collator - collator to use after map and reduce
    
    Returns:
    
    JobCompletableFuture to wait for mapped and possibly reduced result

Class AbstractJob.MappingJobImpl<EntryKey,Key,Value>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

MappingJobImpl

Method Detail

onKeys

onKeys

keyPredicate

chunkSize

topologyChangedStrategy

combiner

reducer

submit

submit