Package org.snmp4j.agent
Interface MOServer
- All Known Implementing Classes:
DefaultMOServer
public interface MOServer
The managed object server interface defines the services that a repository
of managed objects needs to provide for a command responder.
- Version:
- 2.1
- Author:
- Frank Fock
-
Method Summary
Modifier and TypeMethodDescriptionvoid
addContext
(org.snmp4j.smi.OctetString context) Adds the supplied context to the server.void
addContextListener
(ContextListener listener) Adds a context listener to the server.void
addLookupListener
(MOServerLookupListener listener, ManagedObject mo) Adds a managed object lookup listener for the supplied managed object to this managed object server.org.snmp4j.smi.OctetString[]
Returns the contexts known by the server.org.snmp4j.smi.OctetString[]
getRegisteredContexts
(ManagedObject managedObject) Returns the contexts for which the suppliedManagedObject
has been registered.boolean
isContextSupported
(org.snmp4j.smi.OctetString context) Checks whether the supplied context is supported (registered) by this server.iterator()
Return a read-onlyIterator
over the content of this server.boolean
lock
(Object owner, ManagedObject managedObject) Locks a ManagedObject by the supplied owner.boolean
lock
(Object owner, ManagedObject managedObject, long timeoutMillis) Locks a ManagedObject by the supplied owner.Lookup the first (lexicographically ordered) managed object that matches the supplied query.lookup
(MOQuery query, LockRequest lockRequest) Lookup the first (lexicographically ordered) managed object that matches the supplied query.void
register
(ManagedObject mo, org.snmp4j.smi.OctetString context) Registers a managed object for the specified context.void
removeContext
(org.snmp4j.smi.OctetString context) Removes a context from the server.void
removeContextListener
(ContextListener listener) Removes a previously added context listener.boolean
removeLookupListener
(MOServerLookupListener listener, ManagedObject mo) Removes a managed object lookup listener for the specified managed object.boolean
unlock
(Object owner, ManagedObject managedObject) Unlocks a ManagedObject that has been locked by the specified owner.unregister
(ManagedObject mo, org.snmp4j.smi.OctetString context) Removes the registration of the supplied managed object for the specified context.
-
Method Details
-
addContextListener
Adds a context listener to the server. The listener will be informed about context insertion and removal.- Parameters:
listener
- aContextListener
instance to be informed about context changes.
-
removeContextListener
Removes a previously added context listener.- Parameters:
listener
- aContextListener
instance.
-
addContext
void addContext(org.snmp4j.smi.OctetString context) Adds the supplied context to the server. The server however may silently ignore the request if local constraints do not allow to add the context (although this should be an exception case only).- Parameters:
context
- anOctetString
representing the context name to add.
-
removeContext
void removeContext(org.snmp4j.smi.OctetString context) Removes a context from the server. Removing a context does not remove any managed objects from the server's registry.- Parameters:
context
- nOctetString
representing the context name to remove.
-
register
void register(ManagedObject mo, org.snmp4j.smi.OctetString context) throws DuplicateRegistrationException Registers a managed object for the specified context. A managed object can be registered for more than one context.- Parameters:
mo
- aManagedObject
instance.context
- the context name for which to register themo
ornull
if the managed oject is to be registered for all contexts (including the default context).- Throws:
DuplicateRegistrationException
- if the registration conflicts (i.e. overlaps) with an already existing registration.
-
unregister
Removes the registration of the supplied managed object for the specified context.- Parameters:
mo
- aManagedObject
instance.context
- the context name for which to unregister themo
ornull
if the managed object is to be unregistered for all contexts (including the default context). In the latter case however, explicit registrations for a particular context will not be removed!- Returns:
- the removed
ManagedObject
instance ornull
if the removal failed.
-
addLookupListener
Adds a managed object lookup listener for the supplied managed object to this managed object server. AMOServerLookupListener
is called before the managed object is returned bylookup(MOQuery query)
.- Parameters:
listener
- aMOServerLookupListener
instance, for example a managed object that needs to update its state whenever it has been looked upmo
- theManagedObject
that triggers theMOServerLookupEvent
to be fired when it has been looked up.
-
removeLookupListener
Removes a managed object lookup listener for the specified managed object.- Parameters:
listener
- aMOServerLookupListener
instance.mo
- theManagedObject
that triggered theMOServerLookupEvent
to be fired when it has been looked up.- Returns:
true
if the listener could be removed orfalse
if such a listener is not registered.
-
lookup
Lookup the first (lexicographically ordered) managed object that matches the supplied query. No locking will be performed, regardless of the setMOLockStrategy
.- Parameters:
query
- aMOQuery
instance.- Returns:
- the
ManagedObject
that matches the query andnull
if no such object exists.
-
lookup
Lookup the first (lexicographically ordered) managed object that matches the supplied query. Locking will be performed according to the setMOLockStrategy
before the lookup listener is fired. CAUTION: To make sure that the acquired lock is released after the using of the managed object has been finished, theunlock(Object, ManagedObject)
method must be called then.- Parameters:
query
- aMOQuery
instance.lockRequest
- theLockRequest
that holds the lock owner and the timeout for acquiring a lock and returns whether a lock has been acquired or not on behalf of this lookup operation.- Returns:
- the
ManagedObject
that matches the query andnull
if no such object exists. - Since:
- 2.4.0
-
iterator
Iterator<Map.Entry<MOScope,ManagedObject>> iterator()Return a read-onlyIterator
over the content of this server. The iterator is thread safe and can be used while the server is being modified. The remove operation of the iterator is not supported.- Returns:
- the
Iterator
on the Map.Entry instances managed by this server. EachEntry
consists of anMOScope
key instance and a correspondingManagedObject
value instance. If theManagedObject
has been registered for a specific context, then aMOContextScope
is returned as key, otherwise the managed objects ownMOScope
is returned.
-
lock
Locks a ManagedObject by the supplied owner. Once a ManagedObject is locked, a lookup attempt will block until it is unlocked or a predefined timeout occurs.- Parameters:
owner
- an Object.managedObject
- the ManagedObject to lock.- Returns:
true
if the lock could be acquired,false
otherwise, i.e. if an InterruptedException has occurred.
-
lock
Locks a ManagedObject by the supplied owner. Once a ManagedObject is locked, a lookup attempt will block until it is unlocked or a predefined timeout occurs.- Parameters:
owner
- an Object.managedObject
- the ManagedObject to lock.timeoutMillis
- the number of 1/1000 seconds to wait for the lock. 0 or less disables the timeout and waits forever until the lock is released by the current owner.- Returns:
true
if the lock could be acquired,false
otherwise, i.e. if an InterruptedException or timeout has occurred.- Since:
- 1.3
-
unlock
Unlocks a ManagedObject that has been locked by the specified owner. If the ManagedObject is currently locked by another owner this method returns silently.Note: In debug log mode a message is locked if the lock owner does not match the current lock owner.
- Parameters:
owner
- an Object.managedObject
- the ManagedObject to unlock. IfmanagedObject
isnull
then this call has no effect.- Returns:
true
if the lock has been found and released successfully,false
otherwise.
-
getContexts
org.snmp4j.smi.OctetString[] getContexts()Returns the contexts known by the server.- Returns:
- an array of context names.
-
isContextSupported
boolean isContextSupported(org.snmp4j.smi.OctetString context) Checks whether the supplied context is supported (registered) by this server.- Parameters:
context
- a context name.- Returns:
true
if the context is support (thus has previously added byaddContext(org.snmp4j.smi.OctetString)
) andfalse
otherwise.
-
getRegisteredContexts
Returns the contexts for which the suppliedManagedObject
has been registered.- Parameters:
managedObject
- aManagedObject
instance.- Returns:
- an array of context strings, for which
managedObject
has been registered. If themanagedObject
has been registered for all contexts, anull
element is included in the array. - Since:
- 1.4
-