org.gcube.common.core.state

Class GCUBEStatefulResource<RESOURCEID>

java.lang.Object

org.gcube.common.core.utils.handlers.GCUBEServiceClientImpl

org.gcube.common.core.state.GCUBEStatefulResource<RESOURCEID>

Type Parameters:

RESOURCEID - the type of the resource identifier.

All Implemented Interfaces:

GCUBEServiceClient, org.globus.wsrf.Resource

Direct Known Subclasses:

GCUBELocalResource, GCUBEWSResource

public abstract class GCUBEStatefulResource<RESOURCEID>
extends GCUBEServiceClientImpl
implements org.globus.wsrf.Resource

Partial implementation of stateful entities managed by gCube services. In particular, a GCUBEStatefulResource is an identifiable, initialisable, and removable entity.

Author:

Fabio Simeoni (University of Strathclyde)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	GCUBEStatefulResource.LOCK Enumeration of the lock types associated with the resource.
static class	GCUBEStatefulResource.TaskContext Used internally to group contextual information about launched tasks.

Field Summary

Fields

Modifier and Type	Field and Description
protected GCUBELog	logger Instance logger.
protected static org.apache.axis.components.uuid.UUIDGen	uuidGen String generator for local resource identifiers.

Constructor Summary

Constructors

Constructor and Description
GCUBEStatefulResource()

Method Summary

Methods

Modifier and Type	Method and Description
RESOURCEID	getID() Returns the resource identifier.
GCUBEReadWriteLock	getLock() Returns a GCUBEReadWriteLock to grant synchronised access to the resource.
Map<String,GCUBEStatefulResource.TaskContext>	getScheduledTasks() Returns the tasks associated with the resource.
GCUBEScope	getScope() Returns the scope in which interactions ought to take place.
abstract GCUBEServiceContext	getServiceContext() Returns the context of the service associated with the resource.
protected abstract void	initialise(RESOURCEID id, Object... params) Used internally to initialise the resource with a given identifier and from given parameters.
<T> void	launchTask(String taskName, GCUBEHandler<T> task, Long delay, GCUBEScheduledHandler.Mode mode) Launches a scheduled task associated with the WS-Resource.
protected void	onRemove() Invoked by GCUBEResourceHome in the process of removing the resource.
void	setID(RESOURCEID id) Invoked by the GCUBEResourceHome of the resource to set its identifier.
void	setPersistenceDelegate(GCUBEPersistenceDelegate<RESOURCEID,? extends GCUBEStatefulResource<RESOURCEID>> delegate) Invoked by the GCUBEResourceHome of the resource to set the GCUBEPersistenceDelegate that is responsible for the serialisation and deserialisation of the resource to and from long-term storage.
void	stopTask(String taskName) Stops a scheduled task associated with the resource.
void	store() Serialises the resource to long term storage using its associated GCUBEPersistenceDelegate.

Methods inherited from class org.gcube.common.core.utils.handlers.GCUBEServiceClientImpl

getPortTypeMap, setPortTypeMap

Methods inherited from class java.lang.Object

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

Field Detail

uuidGen

protected static final org.apache.axis.components.uuid.UUIDGen uuidGen

String generator for local resource identifiers.

logger

protected final GCUBELog logger

Instance logger.

Constructor Detail

GCUBEStatefulResource

public GCUBEStatefulResource()

Method Detail

getID

public RESOURCEID getID()

Returns the resource identifier.

Returns:

the identifier.

setID

public void setID(RESOURCEID id)

Invoked by the GCUBEResourceHome of the resource to set its identifier.

Parameters:

id - the identifier.

initialise

protected abstract void initialise(RESOURCEID id,
              Object... params)
                            throws Exception

Used internally to initialise the resource with a given identifier and from given parameters.

Parameters:

id - the identifier, or null if a new one should be generated.

params - (optional) the initialisation parameters.

Throws:

Exception - if the resource could not be initialised.

getServiceContext

public abstract GCUBEServiceContext getServiceContext()

Returns the context of the service associated with the resource.

Returns:

the context.

setPersistenceDelegate

public void setPersistenceDelegate(GCUBEPersistenceDelegate<RESOURCEID,? extends GCUBEStatefulResource<RESOURCEID>> delegate)

Invoked by the GCUBEResourceHome of the resource to set the GCUBEPersistenceDelegate that is responsible for the serialisation and deserialisation of the resource to and from long-term storage.

Parameters:

delegate - the delegate.

store

public void store()

Serialises the resource to long term storage using its associated GCUBEPersistenceDelegate.

Throws:

org.globus.wsrf.ResourceException - if the resource could not be serialised.

onRemove

protected void onRemove()
                 throws org.globus.wsrf.ResourceException

Invoked by GCUBEResourceHome in the process of removing the resource.

Throws:

org.globus.wsrf.ResourceException - if the resource could not be removed.

getLock

public GCUBEReadWriteLock getLock()

Returns a GCUBEReadWriteLock to grant synchronised access to the resource.

Client threads are responsible for releasing the lock when they are finished with the resource. (typically from within a finally block).

Returns:

the lock.

See Also:

GCUBEReadWriteLock

launchTask

public <T> void launchTask(String taskName,
                  GCUBEHandler<T> task,
                  Long delay,
                  GCUBEScheduledHandler.Mode mode)
                throws Exception

Launches a scheduled task associated with the WS-Resource.

Parameters:

taskName - the unique name of the task.

task - the task.

delay - the time interval between two runs of the task, in seconds.

mode - the eager or lazy scheduling mode of the task.

Throws:

Exception - if the task could not be launched.

getScheduledTasks

public Map<String,GCUBEStatefulResource.TaskContext> getScheduledTasks()

Returns the tasks associated with the resource.

Returns:

the task, indexed by name.

stopTask

public void stopTask(String taskName)
              throws Exception

Stops a scheduled task associated with the resource.

Parameters:

taskName - the name of the task.

Throws:

Exception - if the task could not be stopped.

getScope

public GCUBEScope getScope()

Returns the scope in which interactions ought to take place. This is used by service handler to inject endpoints into the cache in a scope-sensitive manner.

Typically, this is delegated to a GCUBEScopeManager .

Specified by:

getScope in interface GCUBEServiceClient

Overrides:

getScope in class GCUBEServiceClientImpl

Returns:

the scope, or null if interactions should not to be scoped.