Package me.ahoo.cosid.test.machine.lease

Class MixedLeaseFormatSpec

java.lang.Object

me.ahoo.cosid.test.machine.lease.MixedLeaseFormatSpec

public abstract class MixedLeaseFormatSpec
extends Object

Compatibility kit for the upgrade from 3.4: 3.4 instances (the 3.4 machine id distributor of a backend, writing the 3.4 format) and 4.0 instances (a LeaseStoreMachineIdDistributor on the backend's MachineLeaseStore) sharing one namespace never hold the same machine id, and each takes over the other's expired and released machine ids.

Constructor Summary

Constructors

Constructor	Description
MixedLeaseFormatSpec()

Method Summary

Modifier and Type	Method	Description
void	eachFormatTakesOverTheOthersExpiredLease()
void	eachFormatTakesTheOthersReleasedMachineId()
void	randomDistributeAndRevertNeverShareMachineIds()
void	releasedThenTakenBy34WithTheSameTimestampIsNotTakenAgain()	A 3.4 instance with a host clock behind takes a machine id that 4.0 released and writes back the very same timestamp: 4.0 must not take it from that live 3.4 owner, even though the 4.0 owner's last renewal is older than the safe guard.
protected abstract void	takeReleasedAs34WithTheSameTimestamp(String namespace, int machineId, String instanceId)	Do what a 3.4 instance whose host clock is behind does when it takes a released machine id: give it to instanceId and write back the very same last timestamp, in the 3.4 format.
protected abstract MachineIdDistributor	v34()	A new 3.4 distributor, with its own local state storage.
protected abstract MachineIdDistributor	v40()	A new 4.0 distributor on the lease store, with its own local state storage.

Methods inherited from class java.lang.Object

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

Constructor Details

MixedLeaseFormatSpec

public MixedLeaseFormatSpec()

Method Details

v34

protected abstract MachineIdDistributor v34()

A new 3.4 distributor, with its own local state storage.

v40

protected abstract MachineIdDistributor v40()

A new 4.0 distributor on the lease store, with its own local state storage.

takeReleasedAs34WithTheSameTimestamp

protected abstract void takeReleasedAs34WithTheSameTimestamp(String namespace,
 int machineId,
 String instanceId)

Do what a 3.4 instance whose host clock is behind does when it takes a released machine id: give it to instanceId and write back the very same last timestamp, in the 3.4 format.

randomDistributeAndRevertNeverShareMachineIds

@Test
public void randomDistributeAndRevertNeverShareMachineIds()

eachFormatTakesOverTheOthersExpiredLease

@Test
public void eachFormatTakesOverTheOthersExpiredLease()
                                              throws InterruptedException

Throws:

InterruptedException

eachFormatTakesTheOthersReleasedMachineId

@Test
public void eachFormatTakesTheOthersReleasedMachineId()

releasedThenTakenBy34WithTheSameTimestampIsNotTakenAgain

@Test
public void releasedThenTakenBy34WithTheSameTimestampIsNotTakenAgain()
                                                              throws InterruptedException

A 3.4 instance with a host clock behind takes a machine id that 4.0 released and writes back the very same timestamp: 4.0 must not take it from that live 3.4 owner, even though the 4.0 owner's last renewal is older than the safe guard.

Throws:

InterruptedException