org.gridgain.grid.spi

Interface GridSpi

All Known Subinterfaces:

GridAuthenticationSpi, GridCheckpointSpi, GridCollisionSpi, GridCommunicationSpi<T>, GridDeploymentSpi, GridDiscoverySpi, GridEventStorageSpi, GridFailoverSpi, GridIndexingSpi, GridLoadBalancingSpi, GridSecureSessionSpi, GridSwapSpaceSpi

All Known Implementing Classes:

GridAdaptiveLoadBalancingSpi, GridAlwaysFailoverSpi, GridCacheCheckpointSpi, GridFifoQueueCollisionSpi, GridFileSwapSpaceSpi, GridJdbcCheckpointSpi, GridJobStealingCollisionSpi, GridJobStealingFailoverSpi, GridLocalDeploymentSpi, GridMemoryEventStorageSpi, GridNeverFailoverSpi, GridNoopAuthenticationSpi, GridNoopCheckpointSpi, GridNoopCollisionSpi, GridNoopIndexingSpi, GridNoopSecureSessionSpi, GridNoopSwapSpaceSpi, GridPriorityQueueCollisionSpi, GridRoundRobinLoadBalancingSpi, GridSharedFsCheckpointSpi, GridSpiAdapter, GridTcpCommunicationSpi, GridTcpDiscoverySpi, GridWeightedRandomLoadBalancingSpi

public interface GridSpi

This interface defines life-cycle of SPI implementation. Every SPI implementation should implement this interface. Kernal will not load SPI that doesn't implement this interface.

Grid SPI's can be injected using IoC (dependency injection) with grid resources. Both, field and method based injection are supported. The following grid resources can be injected:

• GridLoggerResource
• GridLocalNodeIdResource
• GridHomeResource
• GridMBeanServerResource
• GridExecutorServiceResource
• GridMarshallerResource
• GridSpringApplicationContextResource
• GridSpringResource
• GridAddressResolverResource

Refer to corresponding resource documentation for more information.

Method Summary

Methods

Modifier and Type	Method and Description
String	getName() Gets SPI name.
Map<String,Object>	getNodeAttributes() This method is called before SPI starts (before method spiStart(String) is called).
void	onContextDestroyed() Callback invoked prior to stopping grid before SPI context is destroyed.
void	onContextInitialized(GridSpiContext spiCtx) Callback invoked when SPI context is initialized.
void	spiStart(String gridName) This method is called to start SPI.
void	spiStop() This method is called to stop SPI.

Method Detail

getName

String getName()

Gets SPI name.

Returns:

SPI name.

getNodeAttributes

Map<String,Object> getNodeAttributes()
                                     throws GridSpiException

This method is called before SPI starts (before method spiStart(String) is called). It allows SPI implementation to add attributes to a local node. Kernal collects these attributes from all SPI implementations loaded up and then passes it to discovery SPI so that they can be exchanged with other nodes.

Returns:

Map of local node attributes this SPI wants to add.

Throws:

GridSpiException - Throws in case of any error.

spiStart

void spiStart(@Nullable
            String gridName)
              throws GridSpiException

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

Parameters:

gridName - Name of grid instance this SPI is being started for (null for default grid).

Throws:

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

onContextInitialized

void onContextInitialized(GridSpiContext spiCtx)
                          throws GridSpiException

Callback invoked when SPI context is initialized. SPI implementation may store SPI context for future access.

This method is invoked after spiStart(String) method is completed, so SPI should be fully functional at this point. Use this method for post-start initialization, such as subscribing a discovery listener, sending a message to remote node, etc...

Parameters:

spiCtx - Spi context.

Throws:

GridSpiException - If context initialization failed (grid will be stopped).

onContextDestroyed

void onContextDestroyed()

Callback invoked prior to stopping grid before SPI context is destroyed. Once this method is complete, grid will begin shutdown sequence. Use this callback for de-initialization logic that may involve SPI context. Note that invoking SPI context after this callback is complete is considered illegal and may produce unknown results.

If GridSpiAdapter is used for SPI implementation, then it will replace actual context with dummy no-op context which is usually good-enough since grid is about to shut down.

spiStop

void spiStop()
             throws GridSpiException

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.

Throws:

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