K
- type of the key of the IMapV
- type of the value of the IMappublic class MapKeyValueSource<K,V> extends KeyValueSource<K,V> implements IdentifiedDataSerializable, PartitionIdAware
KeyValueSource
implementation is used in
KeyValueSource.fromMap(com.hazelcast.core.IMap)
to generate a default
implementation based on a Hazelcast IMap
.Constructor and Description |
---|
MapKeyValueSource(String mapName) |
Modifier and Type | Method and Description |
---|---|
void |
close() |
Map.Entry<K,V> |
element()
Returns the current index element
Calls to this method won't change state.
|
int |
getFactoryId()
Returns DataSerializableFactory factory ID for this class.
|
int |
getId()
Returns type identifier for this class.
|
String |
getMapName() |
boolean |
hasNext()
Called to request if at least one more key-value pair is available from this
data source.
|
K |
key()
Returns the current index key for
KeyPredicate analysis. |
boolean |
open(NodeEngine nodeEngine)
This method is called before accessing the key-value pairs of this KeyValueSource.
|
void |
readData(ObjectDataInput in)
Reads fields from the input stream
|
boolean |
reset()
This method resets all internal state to be a new instance.
|
void |
setPartitionId(int partitionId)
Sets the partition ID to the implementing instance it is executed against
|
void |
writeData(ObjectDataOutput out)
Writes object fields to output stream
|
fromList, fromMap, fromMultiMap, fromSet, getAllKeys, getAllKeys0, isAllKeysSupported
public MapKeyValueSource(String mapName)
public String getMapName()
public boolean open(NodeEngine nodeEngine)
KeyValueSource
open
in class KeyValueSource<K,V>
nodeEngine
- nodeEngine of this cluster nodepublic void close() throws IOException
close
in interface Closeable
close
in interface AutoCloseable
IOException
public boolean hasNext()
KeyValueSource
hasNext
in class KeyValueSource<K,V>
public K key()
KeyValueSource
KeyPredicate
analysis. This is called
to prevent a possible deserialization of unneeded values because the key is not
interesting for the running mapreduce algorithm.
Calls to this method won't change state.key
in class KeyValueSource<K,V>
KeyPredicate
analysispublic Map.Entry<K,V> element()
KeyValueSource
element
in class KeyValueSource<K,V>
public boolean reset()
KeyValueSource
PartitionIdAware
.KeyValueSource.open(com.hazelcast.spi.NodeEngine)
and Closeable.close()
is called multiple times with the other methods between open(...) and close().reset
in class KeyValueSource<K,V>
public void setPartitionId(int partitionId)
PartitionIdAware
setPartitionId
in interface PartitionIdAware
partitionId
- current partition IDpublic void writeData(ObjectDataOutput out) throws IOException
DataSerializable
writeData
in interface DataSerializable
out
- outputIOException
- if an I/O error occurs. In particular,
an IOException
may be thrown if the
output stream has been closed.public void readData(ObjectDataInput in) throws IOException
DataSerializable
readData
in interface DataSerializable
in
- inputIOException
- if an I/O error occurs. In particular,
an IOException
may be thrown if the
input stream has been closed.public int getFactoryId()
IdentifiedDataSerializable
getFactoryId
in interface IdentifiedDataSerializable
public int getId()
IdentifiedDataSerializable
getId
in interface IdentifiedDataSerializable
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