org.apache.ignite.spi.checkpoint.noop

Class NoopCheckpointSpi

java.lang.Object

org.apache.ignite.spi.IgniteSpiAdapter

org.apache.ignite.spi.checkpoint.noop.NoopCheckpointSpi

All Implemented Interfaces:

CheckpointSpi, IgniteSpi

@IgniteSpiNoop
 @IgniteSpiMultipleInstancesSupport(value=true)
public class NoopCheckpointSpi
extends IgniteSpiAdapter
implements CheckpointSpi

No-op implementation of CheckpointSpi. This is default implementation since 4.5.0 version.

Field Summary

Fields inherited from class org.apache.ignite.spi.IgniteSpiAdapter

ignite, igniteInstanceName

Constructor Summary

Constructors

Constructor and Description
NoopCheckpointSpi()

Method Summary

Modifier and Type	Method and Description
@Nullable byte[]	loadCheckpoint(String key) Loads checkpoint from storage by its unique key.
boolean	removeCheckpoint(String key) This method instructs the checkpoint provider to clean saved data for a given key.
boolean	saveCheckpoint(String key, byte[] state, long timeout, boolean overwrite) Saves checkpoint to the storage.
void	setCheckpointListener(CheckpointListener lsnr) Sets the checkpoint listener.
NoopCheckpointSpi	setName(String name) Sets SPI name.
void	spiStart(@Nullable String igniteInstanceName) This method is called to start SPI.
void	spiStop() This method is called to stop SPI.
String	toString()

Methods inherited from class org.apache.ignite.spi.IgniteSpiAdapter

addTimeoutObject, assertParameter, checkConfigurationConsistency0, clientFailureDetectionTimeout, configInfo, createSpiAttributeName, failureDetectionTimeout, failureDetectionTimeoutEnabled, failureDetectionTimeoutEnabled, getConsistentAttributeNames, getExceptionRegistry, getLocalNode, getName, getNodeAttributes, getSpiContext, ignite, initFailureDetectionTimeout, injectables, injectResources, isNodeStopping, onBeforeStart, onClientDisconnected, onClientReconnected, onContextDestroyed, onContextDestroyed0, onContextInitialized, onContextInitialized0, registerMBean, removeTimeoutObject, started, startInfo, startStopwatch, stopInfo, unregisterMBean

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.ignite.spi.IgniteSpi

getName, getNodeAttributes, onClientDisconnected, onClientReconnected, onContextDestroyed, onContextInitialized

Constructor Detail

NoopCheckpointSpi

public NoopCheckpointSpi()

Method Detail

spiStart

public void spiStart(@Nullable
                     @Nullable String igniteInstanceName)
              throws IgniteSpiException

This method is called to start SPI. After this method returns successfully kernel assumes that SPI is fully operational.

Specified by:

spiStart in interface IgniteSpi

Parameters:

igniteInstanceName - Name of Ignite instance this SPI is being started for (null for default Ignite instance).

Throws:

IgniteSpiException - Throws in case of any error during SPI start.

spiStop

public void spiStop()
             throws IgniteSpiException

This method is called to stop SPI. After this method returns kernel assumes that this SPI is finished and all resources acquired by it are released.

Note that this method can be called at any point including during recovery of failed start. It should make no assumptions on what state SPI will be in when this method is called.

Specified by:

spiStop in interface IgniteSpi

Throws:

IgniteSpiException - Thrown in case of any error during SPI stop.

loadCheckpoint

@Nullable
public @Nullable byte[] loadCheckpoint(String key)
                                          throws IgniteSpiException

Loads checkpoint from storage by its unique key.

Specified by:

loadCheckpoint in interface CheckpointSpi

Parameters:

key - Checkpoint key.

Returns:

Loaded data or null if there is no data for a given key.

Throws:

IgniteSpiException - Thrown in case of any error while loading checkpoint data. Note that in case when given key is not found this method will return null.

saveCheckpoint

public boolean saveCheckpoint(String key,
                              byte[] state,
                              long timeout,
                              boolean overwrite)

Saves checkpoint to the storage.

Specified by:

saveCheckpoint in interface CheckpointSpi

Parameters:

key - Checkpoint unique key.

state - Saved data.

timeout - Every intermediate data stored by checkpoint provider should have a timeout. Timeout allows for effective resource management by checkpoint provider by cleaning saved data that are not needed anymore. Generally, the user should choose the minimum possible timeout to avoid long-term resource acquisition by checkpoint provider. Value 0 means that timeout will never expire.

overwrite - Whether or not overwrite checkpoint if it already exists.

Returns:

true if checkpoint has been actually saved, false otherwise.

removeCheckpoint

public boolean removeCheckpoint(String key)

This method instructs the checkpoint provider to clean saved data for a given key.

Specified by:

removeCheckpoint in interface CheckpointSpi

Parameters:

key - Key for the checkpoint to remove.

Returns:

true if data has been actually removed, false otherwise.

setCheckpointListener

public void setCheckpointListener(CheckpointListener lsnr)

Sets the checkpoint listener.

Specified by:

setCheckpointListener in interface CheckpointSpi

Parameters:

lsnr - The listener to set or null.

setName

public NoopCheckpointSpi setName(String name)

Sets SPI name.

Overrides:

setName in class IgniteSpiAdapter

Parameters:

name - SPI name.

Returns:

this for chaining.

toString

public String toString()

Overrides:

toString in class Object