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Oracle® Coherence Java API Reference Release 3.7.1.0 E22843-01 |
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java.lang.Object
com.tangosol.util.Base
com.tangosol.util.BitHelper
com.tangosol.util.ExternalizableHelper
com.tangosol.net.partition.DefaultKeyPartitioningStrategy
public class DefaultKeyPartitioningStrategy
DefaultKeyPartitioningStrategy provides a simple strategy for assigning keys to partitions which is based on the hash code of keys in internal (serialized to Binary) form.
Nested Class Summary |
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Nested classes/interfaces inherited from interface com.tangosol.net.partition.KeyPartitioningStrategy |
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KeyPartitioningStrategy.PartitionAwareKey |
Field Summary | |
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protected PartitionedService |
m_service The PartitionedService that this strategy is bound to. |
Constructor Summary | |
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DefaultKeyPartitioningStrategy() Default constructor. |
Method Summary | |
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static int |
calculateBasePartition(PartitionedService service, java.lang.Object oKey) Determine the partition to which the given key should be assigned for the specified PartitionService. |
static int |
calculateKeyPartition(PartitionedService service, java.lang.Object oKey) Determine the partition to which the given key should be assigned for the specified PartitionService, taking into consideration the associations provided by the service's KeyAssociator. |
PartitionSet |
getAssociatedPartitions(java.lang.Object oKey) Determine the set of partitions that all keys associated with the specified key are assigned to. |
int |
getKeyPartition(java.lang.Object oKey) Determine the partition to which a particular key should be assigned. |
void |
init(PartitionedService service) Initialize the KeyPartitioningStrategy and bind it to the specified PartitionedService. |
Methods inherited from class com.tangosol.util.BitHelper |
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countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString |
Field Detail |
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protected PartitionedService m_service
Constructor Detail |
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public DefaultKeyPartitioningStrategy()
Method Detail |
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public void init(PartitionedService service)
init
in interface KeyPartitioningStrategy
service
- the PartitionedService that this strategy is being bound topublic int getKeyPartition(java.lang.Object oKey)
In general, implementations are expected to respect the associations provided by the service's KeyAssociator in such a way that keys that return the same associated key
would be assigned to the same partition. Furthermore, implementations are also expected to respect explicit partition-assignments dictated by the KeyPartitioningStrategy.PartitionAwareKey
interface. Naturally, those two interfaces should not be combined for a given key.
The resulting partition must be in the range [0..N-1], where N is the value returned from PartitionedService.getPartitionCount()
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getKeyPartition
in interface KeyPartitioningStrategy
oKey
- a key in its Object formPartitionedService.getPartitionOwner(int)
public PartitionSet getAssociatedPartitions(java.lang.Object oKey)
getKeyPartition
method.getAssociatedPartitions
in interface KeyPartitioningStrategy
oKey
- a key in its Object formpublic static int calculateKeyPartition(PartitionedService service, java.lang.Object oKey)
The resulting partition will be in the range [0..N), where N is the value returned from the PartitionedService.getPartitionCount()
method.
service
- the PartitionedServiceoKey
- a key in its original (Object) formatpublic static int calculateBasePartition(PartitionedService service, java.lang.Object oKey)
The resulting partition will be in the range [0..N), where N is the value returned from the PartitionedService.getPartitionCount()
method.
service
- the PartitionedServiceoKey
- a key in its original (Object) format
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Oracle® Coherence Java API Reference Release 3.7.1.0 E22843-01 |
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