Package org.yamcs.parameter

Class ParameterWithIdRequestHelper

java.lang.Object

org.yamcs.parameter.ParameterWithIdRequestHelper

All Implemented Interfaces:

ParameterConsumer

public class ParameterWithIdRequestHelper
extends Object
implements ParameterConsumer

This sits in front of the ParameterRequestManager and implements subscriptions based on NamedObjectId taking care to send to the consumers the parameters with the requested id. A client can request in fact the same parameter with two different names and they will get it twice each time. In addition it can also provide updates on parameter expirations. TODO: impose some subscription limits

Constructor Summary

Constructors

Constructor	Description
ParameterWithIdRequestHelper(ParameterRequestManager prm, ParameterWithIdConsumer listener)

Method Summary

Modifier and Type	Method	Description
void	addItemsToRequest(int subscriptionId, List<Yamcs.NamedObjectId> idList, User user)
int	addRequest(List<Yamcs.NamedObjectId> idList, boolean checkExpiration, User user)
int	addRequest(List<Yamcs.NamedObjectId> idList, User user)
static ParameterWithId	checkName(ParameterRequestManager prm, Yamcs.NamedObjectId id)
static List<ParameterWithId>	checkNames(ParameterRequestManager prm, List<Yamcs.NamedObjectId> idList)
ParameterRequestManager	getPrm()
List<ParameterValueWithId>	getValuesFromCache(int subscriptionId)	retrieve the subscribed values from cache
List<ParameterValueWithId>	getValuesFromCache(List<Yamcs.NamedObjectId> idList, User user)	Retrieve a list of parameter values from cache.
void	quit()
void	removeItemsFromRequest(int subscriptionId, List<Yamcs.NamedObjectId> parameterIds, User user)
void	removeRequest(int subscriptionId)
List<Yamcs.NamedObjectId>	selectPrm(ParameterRequestManager prm, User user)
int	subscribeAll(User user)
List<Yamcs.NamedObjectId>	switchPrm(ParameterRequestManager newPrm, User user)	Change processor and return the list of parameters that were valid in the old processor and are not anymore
void	unselectPrm()
void	updateItems(int subscriptionId, List<ParameterValue> items)	Called from when new parameters are available to be sent to clients

Methods inherited from class java.lang.Object

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

Constructor Details

ParameterWithIdRequestHelper

public ParameterWithIdRequestHelper(ParameterRequestManager prm,
 ParameterWithIdConsumer listener)

Method Details

addRequest

public int addRequest(List<Yamcs.NamedObjectId> idList,
 User user)
               throws InvalidIdentification,
NoPermissionException

Throws:

InvalidIdentification

NoPermissionException

addRequest

public int addRequest(List<Yamcs.NamedObjectId> idList,
 boolean checkExpiration,
 User user)
               throws InvalidIdentification,
NoPermissionException

Throws:

InvalidIdentification

NoPermissionException

addItemsToRequest

public void addItemsToRequest(int subscriptionId,
 List<Yamcs.NamedObjectId> idList,
 User user)
                       throws InvalidIdentification,
NoPermissionException

Throws:

InvalidIdentification

NoPermissionException

checkName

public static ParameterWithId checkName(ParameterRequestManager prm,
 Yamcs.NamedObjectId id)
                                 throws InvalidIdentification

Throws:

InvalidIdentification

checkNames

public static List<ParameterWithId> checkNames(ParameterRequestManager prm,
 List<Yamcs.NamedObjectId> idList)
                                        throws InvalidIdentification

Throws:

InvalidIdentification

removeRequest

public void removeRequest(int subscriptionId)

removeItemsFromRequest

public void removeItemsFromRequest(int subscriptionId,
 List<Yamcs.NamedObjectId> parameterIds,
 User user)
                            throws NoPermissionException

Throws:

NoPermissionException

getPrm

public ParameterRequestManager getPrm()

subscribeAll

public int subscribeAll(User user)
                 throws NoPermissionException

Throws:

NoPermissionException

getValuesFromCache

public List<ParameterValueWithId> getValuesFromCache(int subscriptionId)

retrieve the subscribed values from cache

Parameters:

subscriptionId -

Returns:

getValuesFromCache

public List<ParameterValueWithId> getValuesFromCache(List<Yamcs.NamedObjectId> idList,
 User user)
                                              throws InvalidIdentification,
NoPermissionException

Retrieve a list of parameter values from cache. This call does not block.

Parameters:

idList -

user -

Returns:

Throws:

InvalidIdentification

NoPermissionException

updateItems

public void updateItems(int subscriptionId,
 List<ParameterValue> items)

Called from when new parameters are available to be sent to clients

Specified by:

updateItems in interface ParameterConsumer

unselectPrm

public void unselectPrm()

selectPrm

public List<Yamcs.NamedObjectId> selectPrm(ParameterRequestManager prm,
 User user)
                                    throws NoPermissionException

Throws:

NoPermissionException

switchPrm

public List<Yamcs.NamedObjectId> switchPrm(ParameterRequestManager newPrm,
 User user)
                                    throws NoPermissionException

Change processor and return the list of parameters that were valid in the old processor and are not anymore

Throws:

NoPermissionException

quit

public void quit()