org.apache.shardingsphere.elasticjob.infra.handler.sharding.impl

Class AverageAllocationJobShardingStrategy

java.lang.Object

org.apache.shardingsphere.elasticjob.infra.handler.sharding.impl.AverageAllocationJobShardingStrategy

All Implemented Interfaces:

JobShardingStrategy, TypedSPI

public final class AverageAllocationJobShardingStrategy
extends Object
implements JobShardingStrategy

Sharding strategy which for average by sharding item.

If the job server number and sharding count cannot be divided, the redundant sharding item that cannot be divided will be added to the server with small sequence number in turn. For example: 1. If there are 3 job servers and the total sharding count is 9, each job server is divided into: 1=[0,1,2], 2=[3,4,5], 3=[6,7,8]; 2. If there are 3 job servers and the total sharding count is 8, each job server is divided into: 1=[0,1,6], 2=[2,3,7], 3=[4,5]; 3. If there are 3 job servers and the total sharding count is 10, each job server is divided into: 1=[0,1,2,9], 2=[3,4,5], 3=[6,7,8].

Constructor Summary

Constructors

Constructor and Description
AverageAllocationJobShardingStrategy()

Method Summary

Modifier and Type	Method and Description
String	getType() Get type.
Map<JobInstance,List<Integer>>	sharding(List<JobInstance> jobInstances, String jobName, int shardingTotalCount) Sharding job.

Methods inherited from class java.lang.Object

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

Constructor Detail

AverageAllocationJobShardingStrategy

public AverageAllocationJobShardingStrategy()

Method Detail

sharding

public Map<JobInstance,List<Integer>> sharding(List<JobInstance> jobInstances,
                                               String jobName,
                                               int shardingTotalCount)

Description copied from interface: JobShardingStrategy

Sharding job.

Specified by:

sharding in interface JobShardingStrategy

Parameters:

jobInstances - all job instances which participate in sharding

jobName - job name

shardingTotalCount - sharding total count

Returns:

sharding result

getType

public String getType()

Description copied from interface: TypedSPI

Get type.

Specified by:

getType in interface TypedSPI

Returns:

type