org.apache.flink.connector.jdbc.xa

接口 XidGenerator

所有超级接口:

AutoCloseable, Serializable

@Internal
public interface XidGenerator
extends Serializable, AutoCloseable

Xid generator.

方法概要

限定符和类型	方法和说明
boolean	belongsToSubtask(Xid xid, org.apache.flink.api.common.functions.RuntimeContext ctx)
default void	close()
Xid	generateXid(org.apache.flink.api.common.functions.RuntimeContext runtimeContext, long checkpointId) Generate new Xid.
default void	open()
static XidGenerator	semanticXidGenerator() Creates a XidGenerator that generates xids from: job id subtask index checkpoint id four random bytes generated using SecureRandom) Each created XidGenerator instance MUST be used for only one Sink instance (otherwise Xids could collide).

方法详细资料

generateXid

Xid generateXid(org.apache.flink.api.common.functions.RuntimeContext runtimeContext,
                long checkpointId)

Generate new Xid. Requirements for generated Xids:

• Global Transaction Id MUST be unique across Flink job, and probably across Xids generated by other jobs and applications - depends on the usage of this class
• SHOULD be immutable
• SHOULD override hashCode and equals

参数:

runtimeContext - can be used for example to derive global transaction id

checkpointId - can be used for example to derive global transaction id

open

default void open()

belongsToSubtask

boolean belongsToSubtask(Xid xid,
                         org.apache.flink.api.common.functions.RuntimeContext ctx)

返回:

true if the provided transaction belongs to this subtask

close

default void close()

指定者:

close 在接口中 AutoCloseable

semanticXidGenerator

static XidGenerator semanticXidGenerator()

Creates a XidGenerator that generates xids from:

1. job id
2. subtask index
3. checkpoint id
4. four random bytes generated using SecureRandom)

Each created XidGenerator instance MUST be used for only one Sink instance (otherwise Xids could collide).