org.apache.ignite.internal.processors.cache

Class PartitionUpdateCounterVolatileImpl

java.lang.Object

org.apache.ignite.internal.processors.cache.PartitionUpdateCounterVolatileImpl

All Implemented Interfaces:

Iterable<long[]>, PartitionUpdateCounter

public class PartitionUpdateCounterVolatileImpl
extends Object
implements PartitionUpdateCounter

Partition update counter for volatile caches.

Doesn't track gaps in update sequence because it's not needed for volatile caches (because their state is lost on node failure).

In this mode LWM and HWM are non distinguishable.

Constructor Summary

Constructors

Constructor and Description
PartitionUpdateCounterVolatileImpl(CacheGroupContext grp)

Method Summary

Modifier and Type	Method and Description
Object	comparableState()
CacheGroupContext	context()
PartitionUpdateCounter	copy()
boolean	empty()
boolean	equals(Object o)
GridLongList	finalizeUpdateCounters() Flushes pending update counters closing all possible gaps.
long	get() Get LWM.
@Nullable byte[]	getBytes()
long	highestAppliedCounter() Returns highest applied update counter.
void	init(long initUpdCntr, @Nullable byte[] cntrUpdData) Restores update counter state.
long	initial()
Iterator<long[]>	iterator()
long	next() Increment LWM by 1.
long	next(long delta) Increment LWM by delta.
long	reserve(long delta) Increment HWM by delta.
long	reserved() Returns HWM.
void	reset() Reset counter internal state to zero.
void	resetInitialCounter() Reset the initial counter value to zero.
boolean	sequential()
String	toString()
void	update(long val) Sets update counter to absolute value.
boolean	update(long start, long delta) Applies counter update out of range.
void	updateInitial(long start, long delta)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

PartitionUpdateCounterVolatileImpl

public PartitionUpdateCounterVolatileImpl(CacheGroupContext grp)

Parameters:

grp - Group.

Method Detail

init

public void init(long initUpdCntr,
                 @Nullable
                 @Nullable byte[] cntrUpdData)

Restores update counter state.

Specified by:

init in interface PartitionUpdateCounter

Parameters:

initUpdCntr - LWM.

cntrUpdData - Counter updates raw data.

initial

public long initial()

Specified by:

initial in interface PartitionUpdateCounter

get

public long get()

Get LWM.

Specified by:

get in interface PartitionUpdateCounter

Returns:

Current LWM.

next

public long next()

Increment LWM by 1.

Specified by:

next in interface PartitionUpdateCounter

Returns:

New LWM.

update

public void update(long val)

Sets update counter to absolute value. All missed updates will be discarded.

Specified by:

update in interface PartitionUpdateCounter

Parameters:

val - Absolute value.

update

public boolean update(long start,
                      long delta)

Applies counter update out of range. Update ranges must not intersect.

Specified by:

update in interface PartitionUpdateCounter

Parameters:

start - Start (<= lwm).

delta - Delta.

Returns:

True if update was actually applied.

updateInitial

public void updateInitial(long start,
                          long delta)

Specified by:

updateInitial in interface PartitionUpdateCounter

Parameters:

start - Counter.

delta - Delta.

finalizeUpdateCounters

public GridLongList finalizeUpdateCounters()

Flushes pending update counters closing all possible gaps.

Specified by:

finalizeUpdateCounters in interface PartitionUpdateCounter

Returns:

Even-length array of pairs [start, end] for each gap.

reserve

public long reserve(long delta)

Increment HWM by delta.

Specified by:

reserve in interface PartitionUpdateCounter

Parameters:

delta - Delta.

Returns:

New HWM.

next

public long next(long delta)

Increment LWM by delta.

Specified by:

next in interface PartitionUpdateCounter

Parameters:

delta - Delta.

Returns:

New LWM.

sequential

public boolean sequential()

Specified by:

sequential in interface PartitionUpdateCounter

Returns:

True if counter has no missed updates.

getBytes

@Nullable
public @Nullable byte[] getBytes()

Specified by:

getBytes in interface PartitionUpdateCounter

reset

public void reset()

Reset counter internal state to zero.

Specified by:

reset in interface PartitionUpdateCounter

resetInitialCounter

public void resetInitialCounter()

Reset the initial counter value to zero.

Specified by:

resetInitialCounter in interface PartitionUpdateCounter

equals

public boolean equals(Object o)

Overrides:

equals in class Object

reserved

public long reserved()

Returns HWM.

Specified by:

reserved in interface PartitionUpdateCounter

Returns:

Current HWM.

highestAppliedCounter

public long highestAppliedCounter()

Returns highest applied update counter.

Specified by:

highestAppliedCounter in interface PartitionUpdateCounter

Returns:

Highest applied counter.

empty

public boolean empty()

Specified by:

empty in interface PartitionUpdateCounter

Returns:

True if counter has not seen any update.

iterator

public Iterator<long[]> iterator()

Specified by:

iterator in interface Iterable<long[]>

Specified by:

iterator in interface PartitionUpdateCounter

Returns:

Iterator for pairs [start, range] for each out-of-order update in the update counter sequence.

toString

public String toString()

Overrides:

toString in class Object

context

public CacheGroupContext context()

Specified by:

context in interface PartitionUpdateCounter

Returns:

Cache group context.

copy

public PartitionUpdateCounter copy()

Specified by:

copy in interface PartitionUpdateCounter

Returns:

A deep copy of current instance.

comparableState

public Object comparableState()

Specified by:

comparableState in interface PartitionUpdateCounter

Returns:

Comparable counter state.