org.apache.ignite.internal

Class IgniteServicesImpl

java.lang.Object

org.apache.ignite.internal.AsyncSupportAdapter

org.apache.ignite.internal.IgniteServicesImpl

All Implemented Interfaces:

Externalizable, Serializable, IgniteServices, IgniteAsyncSupport

public class IgniteServicesImpl
extends AsyncSupportAdapter
implements IgniteServices, Externalizable

IgniteCompute implementation.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.ignite.internal.AsyncSupportAdapter

curFut

Constructor Summary

Constructors

Constructor and Description
IgniteServicesImpl() Required by Externalizable.
IgniteServicesImpl(GridKernalContext ctx, ClusterGroupAdapter prj, boolean async)

Method Summary

Methods

Modifier and Type	Method and Description
void	cancel(String name) Cancels service deployment.
void	cancelAll() Cancels all deployed services.
ClusterGroup	clusterGroup() Gets the cluster group to which this GridServices instance belongs.
void	deploy(ServiceConfiguration cfg) Deploys multiple instances of the service on the grid according to provided configuration.
void	deployClusterSingleton(String name, Service svc) Deploys a cluster-wide singleton service.
void	deployKeyAffinitySingleton(String name, Service svc, String cacheName, Object affKey) Deploys one instance of this service on the primary node for a given affinity key.
void	deployMultiple(String name, Service svc, int totalCnt, int maxPerNodeCnt) Deploys multiple instances of the service on the grid.
void	deployNodeSingleton(String name, Service svc) Deploys a per-node singleton service.
void	readExternal(ObjectInput in)
protected Object	readResolve() Reconstructs object on unmarshalling.
<T> T	service(String name) Gets deployed service with specified name.
Collection<ServiceDescriptor>	serviceDescriptors() Gets metadata about all deployed services.
<T> T	serviceProxy(String name, Class<? super T> svcItf, boolean sticky) Gets a remote handle on the service.
<T> Collection<T>	services(String name) Gets all deployed services with specified name.
IgniteServices	withAsync() Gets instance of this component with asynchronous mode enabled.
void	writeExternal(ObjectOutput out)

Methods inherited from class org.apache.ignite.internal.AsyncSupportAdapter

createAsyncInstance, createFuture, future, future, isAsync, saveOrGet

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.ignite.lang.IgniteAsyncSupport

future, isAsync

Constructor Detail

IgniteServicesImpl

public IgniteServicesImpl()

Required by Externalizable.

IgniteServicesImpl

public IgniteServicesImpl(GridKernalContext ctx,
                  ClusterGroupAdapter prj,
                  boolean async)

Parameters:

ctx - Kernal context.

prj - Projection.

async - Async support flag.

Method Detail

clusterGroup

public ClusterGroup clusterGroup()

Gets the cluster group to which this GridServices instance belongs.

Specified by:

clusterGroup in interface IgniteServices

Returns:

Cluster group to which this GridServices instance belongs.

deployNodeSingleton

public void deployNodeSingleton(String name,
                       Service svc)

Deploys a per-node singleton service. Ignite will guarantee that there is always one instance of the service running on each node. Whenever new nodes are started within the underlying cluster group, Ignite will automatically deploy one instance of the service on every new node.

This method is analogous to calling deployMultiple(name, svc, 0, 1) method.

Specified by:

deployNodeSingleton in interface IgniteServices

Parameters:

name - Service name.

svc - Service instance.

deployClusterSingleton

public void deployClusterSingleton(String name,
                          Service svc)

Deploys a cluster-wide singleton service. Ignite will guarantee that there is always one instance of the service in the cluster. In case if grid node on which the service was deployed crashes or stops, Ignite will automatically redeploy it on another node. However, if the node on which the service is deployed remains in topology, then the service will always be deployed on that node only, regardless of topology changes.

Note that in case of topology changes, due to network delays, there may be a temporary situation when a singleton service instance will be active on more than one node (e.g. crash detection delay).

This method is analogous to calling deployMultiple(name, svc, 1, 1) method.

Specified by:

deployClusterSingleton in interface IgniteServices

Parameters:

name - Service name.

svc - Service instance.

deployMultiple

public void deployMultiple(String name,
                  Service svc,
                  int totalCnt,
                  int maxPerNodeCnt)

Deploys multiple instances of the service on the grid. Ignite will deploy a maximum amount of services equal to 'totalCnt' parameter making sure that there are no more than 'maxPerNodeCnt' service instances running on each node. Whenever topology changes, Ignite will automatically rebalance the deployed services within cluster to make sure that each node will end up with about equal number of deployed instances whenever possible.

Note that at least one of 'totalCnt' or 'maxPerNodeCnt' parameters must have value greater than 0.

This method is analogous to the invocation of IgniteServices.deploy(org.apache.ignite.services.ServiceConfiguration) method as follows:

     GridServiceConfiguration cfg = new GridServiceConfiguration();

     cfg.setName(name);
     cfg.setService(svc);
     cfg.setTotalCount(totalCnt);
     cfg.setMaxPerNodeCount(maxPerNodeCnt);

     grid.services().deploy(cfg);
 

Specified by:

deployMultiple in interface IgniteServices

Parameters:

name - Service name.

svc - Service instance.

totalCnt - Maximum number of deployed services in the grid, 0 for unlimited.

maxPerNodeCnt - Maximum number of deployed services on each node, 0 for unlimited.

deployKeyAffinitySingleton

public void deployKeyAffinitySingleton(String name,
                              Service svc,
                              @Nullable
                              String cacheName,
                              Object affKey)

Deploys one instance of this service on the primary node for a given affinity key. Whenever topology changes and primary node assignment changes, Ignite will always make sure that the service is undeployed on the previous primary node and deployed on the new primary node.

Note that in case of topology changes, due to network delays, there may be a temporary situation when a service instance will be active on more than one node (e.g. crash detection delay).

This method is analogous to the invocation of IgniteServices.deploy(org.apache.ignite.services.ServiceConfiguration) method as follows:

     GridServiceConfiguration cfg = new GridServiceConfiguration();

     cfg.setName(name);
     cfg.setService(svc);
     cfg.setCacheName(cacheName);
     cfg.setAffinityKey(affKey);
     cfg.setTotalCount(1);
     cfg.setMaxPerNodeCount(1);

     grid.services().deploy(cfg);
 

Specified by:

deployKeyAffinitySingleton in interface IgniteServices

Parameters:

name - Service name.

svc - Service instance.

cacheName - Name of the cache on which affinity for key should be calculated, null for default cache.

affKey - Affinity cache key.

deploy

public void deploy(ServiceConfiguration cfg)

Deploys multiple instances of the service on the grid according to provided configuration. Ignite will deploy a maximum amount of services equal to cfg.getTotalCount() parameter making sure that there are no more than cfg.getMaxPerNodeCount() service instances running on each node. Whenever topology changes, Ignite will automatically rebalance the deployed services within cluster to make sure that each node will end up with about equal number of deployed instances whenever possible.

If cfg.getAffinityKey() is not null, then Ignite will deploy the service on the primary node for given affinity key. The affinity will be calculated on the cache with cfg.getCacheName() name.

If cfg.getNodeFilter() is not null, then Ignite will deploy service on all grid nodes for which the provided filter evaluates to true. The node filter will be checked in addition to the underlying cluster group filter, or the whole grid, if the underlying cluster group includes all the cluster nodes.

Note that at least one of 'totalCnt' or 'maxPerNodeCnt' parameters must have value greater than 0.

Here is an example of creating service deployment configuration:

     GridServiceConfiguration cfg = new GridServiceConfiguration();

     cfg.setName(name);
     cfg.setService(svc);
     cfg.setTotalCount(0); // Unlimited.
     cfg.setMaxPerNodeCount(2); // Deploy 2 instances of service on each node.

     grid.services().deploy(cfg);
 

Specified by:

deploy in interface IgniteServices

Parameters:

cfg - Service configuration.

cancel

public void cancel(String name)

Cancels service deployment. If a service with specified name was deployed on the grid, then Service.cancel(org.apache.ignite.services.ServiceContext) method will be called on it.

Note that Ignite cannot guarantee that the service exits from Service.execute(org.apache.ignite.services.ServiceContext) method whenever Service.cancel(org.apache.ignite.services.ServiceContext) is called. It is up to the user to make sure that the service code properly reacts to cancellations.

Supports asynchronous execution (see IgniteAsyncSupport).

Specified by:

cancel in interface IgniteServices

Parameters:

name - Name of service to cancel.

cancelAll

public void cancelAll()

Cancels all deployed services.

Note that depending on user logic, it may still take extra time for a service to finish execution, even after it was cancelled.

Supports asynchronous execution (see IgniteAsyncSupport).

Specified by:

cancelAll in interface IgniteServices

serviceDescriptors

public Collection<ServiceDescriptor> serviceDescriptors()

Gets metadata about all deployed services.

Specified by:

serviceDescriptors in interface IgniteServices

Returns:

Metadata about all deployed services.

service

public <T> T service(String name)

Gets deployed service with specified name.

Specified by:

service in interface IgniteServices

Type Parameters:

T - Service type

Parameters:

name - Service name.

Returns:

Deployed service with specified name.

serviceProxy

public <T> T serviceProxy(String name,
                 Class<? super T> svcItf,
                 boolean sticky)
               throws IgniteException

Gets a remote handle on the service. If service is available locally, then local instance is returned, otherwise, a remote proxy is dynamically created and provided for the specified service.

Specified by:

serviceProxy in interface IgniteServices

Parameters:

name - Service name.

svcItf - Interface for the service.

sticky - Whether or not Ignite should always contact the same remote service or try to load-balance between services.

Returns:

Either proxy over remote service or local service if it is deployed locally.

Throws:

IgniteException - If failed to create service proxy.

services

public <T> Collection<T> services(String name)

Gets all deployed services with specified name.

Specified by:

services in interface IgniteServices

Type Parameters:

T - Service type.

Parameters:

name - Service name.

Returns:

all deployed services with specified name.

withAsync

public IgniteServices withAsync()

Gets instance of this component with asynchronous mode enabled.

Specified by:

withAsync in interface IgniteServices

Specified by:

withAsync in interface IgniteAsyncSupport

Overrides:

withAsync in class AsyncSupportAdapter

Returns:

Instance of this component with asynchronous mode enabled.

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

readResolve

protected Object readResolve()
                      throws ObjectStreamException

Reconstructs object on unmarshalling.

Returns:

Reconstructed object.

Throws:

ObjectStreamException - Thrown in case of unmarshalling error.