Building Your Event-Driven Architecture : Universal Messaging Administration Guide : Universal Messaging Enterprise Manager : Administration Using Enterprise Manager : Scheduling : Universal Messaging Scheduling : Tasks
Universal Messaging Scheduling : Tasks
Tasks are executed by either time based (calendar, see Universal Messaging Scheduling : Calendar Triggers Schedules) or conditional triggers (see Universal Messaging Scheduling : Conditional Triggers). There are a number of tasks that can be executed by the Universal Messaging Scheduling engine. Each task corresponds to a unit of work that performs an operation on the desired object within a Universal Messaging realm.
This section will discuss the available tasks that can be declared within a Universal Messaging scheduling script :
*Task Expressions
*Store Tasks
*Interface Tasks
*Memory Tasks
*Counter Tasks
*Timer Tasks
*Config Tasks
To view examples of scheduling scripts, see Scheduler Examples.
Task Expressions
Task expressions are comprised of the object on which you wish to perform the operation, and the required parameters. For more information on the grammar for task expressions, please see the writing scripts help file (see Universal Messaging Scheduling : Writing Schedule Scripts). The following sections will describe the task objects and the parameters required to perform them. The example below demonstrates both Interface, Logger and Counter tasks.
scheduler realmInterfaceSchedule {

declare Interface myNHP ("nhp0");
declare Counter myCounter("myExhaustedThreads");

when (myNHP.idleThreads == 0) {

Logger.report("NHP0 Interface has no idles Threads");
myCounter.inc();

}

when (myCounter >= 5) {

Logger.report("Increasing the accept thread count on NHP0");
myNHP.threads("+10");
myCounter.reset();

}

}
Store Tasks - Channel / Queue operations
Store tasks can be used by first of all declaring the desired object as in the following syntax:
declare Store myChannel("/customer/sales");
The table below lists those tasks available on a Store object, such that the task expression will look like :
when (myChannel.numOfEvents < 100) {

myChannel.maintain();

}
Task Object
Syntax
Description
maintain
Store.maintain("*");
Store.maintain("/customer/sales");
myChannel.maintain();
Perform maintenance on a channel so that any purged events are removed from the channel or queue event store.
publish
myChannel.publish("Byte array data",
"tag", "key1=value1:key2:value2" );
Publish an event to the channel / queue, using the given byte array, event tag and event dictionary values.
purge
myChannel.purge();
myChannel.purge(0, 100000);
myChannel.purge(0, 10000,
"key1 = 'value1'");
Purge all events on a channel, or events between a start and end eid, or using a purge filter.
createChannel
myChannel.createChannel(0, 0, "P");
Create the channel using the name it was declared as, and the ttl, capacity and type specified in the parameters
createQueue
myChannel.createQueue(0, 0, "P");
Create the queue using the name it was declared as, and the ttl, capacity and type specified in the parameters
Interface Tasks - Universal Messaging Interface operations
Interface tasks are operations that can be performed on all interfaces or individually declared interfaces. To declare an interface use the following syntax as an example:
declare Interface myNHP("nhp0");
The table below lists those tasks that can be executed on an Interface object, such that the task expression will look like :
when (myNHP.connections > 1000) {

myNHP.threads("+10");

}
Task Object
Syntax
Description
stop
myNHP.stop();
Interface.stop("nhp0");
Stop the interface
start
myNHP.start();
Interface.start("nhp0");
Start The interface
stopAll
Interface.stopAll();
Stop all interfaces on the realm
startAll
Interface.startAll();
Start all interfaces on the realm
authTime
myNHP.authTime(20000);
myNHP.authTime("+10000");
Set the interface authentication time to a value, or increase / decrease it by a value.
backlog
myNHP.backlog(200);
myNHP.backlog("+100");
Set the interface backlog time to a value, or increase / decrease it by a value.
autoStart
myNHP.autoStart("true");
myNHP.autoStart("false");
Set whether an interface is automatically started when the realm is started.
advertise
myNHP.advertise("true");
myNHP.advertise("false");
Set whether an interface is available to clients using the admin API.
certificateValidation
myNHP.certificateValidation("true");
myNHP.certificateValidation("false");
Set whether an interface (SSL) requires clients to provide a certificate to authenticate.
threads
myNHP.threads(10);
myNHP.threads("+10");
Set the interface accept threads to a value or increase / decrease it by a value.
MemoryManager Triggers - Universal Messaging JVM Memory Management operations
MemoryManager triggers are declared using the following syntax as an example:
declare MemoryManager mem;
The table below lists those triggers that can be evaluated on the memory management object, such that the task expression will look like :
when (mem.freeMemory < 1000000) {

}
Task Object
Syntax
Description
flush
mem.flush(true);
mem.flush(false);
Cause the JVM to call garbage collection, and optionally release used memory
Counter Tasks - Counter tasks
Counter tasks allow you to increment, decrement, set and reset a local counter within the Universal Messaging scheduling engine. Counter tasks are declared using the following syntax as an example:
declare Counter counter1 ("myCounter");
The counter task can be executing by referencing the Counter object itself, and calling one of a number of available tasks. The basic counter task expression will look like :
when ( counter1 > 5) {

counter1.reset();

}
The table below shows the tasks that can be executed on the Counter task.
Task Object
Syntax
Description
dec
counter1.dec()
Decrement the counter by 1
inc
counter1.inc()
Increment the counter by 1
set
counter1.set(5)
Set the counter to a value
reset
counter1.reset()
Reset the counter to 0
Timer Tasks - Timer operations
Timer tasks allow you to start, stop and reset the timer. Time tasks are declared using the following syntax as an example:
declare Timer reportTimer ("myTimer");
The timer task can be executed by referencing the timer object itself, such that the task expression will look like :
when ( reportTimer == 60 ) {

reportTimer.reset();

}
The table below shows the tasks that can be executed on the Counter task.
Task Object
Syntax
Description
start
reportTimer.start()
Start the timer
inc
reportTimer.stop()
Stop the timer
reset
reportTimer.reset()
Reset the timer
Config Tasks - Channel / Queue based triggers
Config tasks can be used to set any configuration value available in the Config panel for a realm. Any configuration value can be used as part of a trigger task expression. Config tasks are declared using the following syntax as an example (below example refers to the 'GlobalValues' configuration group:
declare Config myGlobal ("GlobalValues");
declare Config myAudit ("AuditSettings");
declare Config myClientTimeout ("ClientTimeoutValues");
declare Config myCluster ("ClusterConfig");
declare Config myEventStorage ("EventStorage");
declare Config myFanout ("FanoutValues");
declare Config myJVM ("JVMManagement");
declare Config myJoinConfig ("JoinConfig");
declare Config myRecovery ("RecoveryDaemon");
declare Config myTXMgr ("TransactionManager");
The table below lists those tasks that can be evaluated on a config object, such that the task expression will look like :
when (myGlobal.MaxNoOfConnections == -1) {

myGlobal.MaxNoOfConnections(1000);

}
Trigger Object
Syntax
Description
GlobalValues
SchedulerPoolSize
myGlobal.SchedulerPoolSize(2);
The number of threads assigned to the scheduler
MaxNoOfConnections
myGlobal.MaxNoOfConnections(-1);
Sets the maximum concurrent connections to the server, -1 indicates no restriction
StatusUpdateTime
myGlobal.StatusUpdateTime(60000);
The number of ms between status events being written to disk
StatusBroadcast
myGlobal.StatusBroadcast(2000);
The number of ms between status events being published
fLoggerLevel
myGlobal.fLoggerLevel(4);
The server logging level
NHPTimeout
myGlobal.NHPTimeout(2000);
The number of milliseconds the server will wait for client authentication
NHPScanTime
myGlobal.NHPScanTime(10000);
The number of milliseconds that the server will wait before scanning for client timeouts
HandshakeTimeout
myGlobal.HandshakeTimeout(12000);
The number of milliseconds that the server will wait for the session to be established
StampDictionary
myGlobal.StampDictionary(true);
Place Universal Messaging details into the dictionary (true/false)
ExtendedMessageSelector
myGlobal.ExtendedMessageSelector (true);
If true, allows the server to use the extended message selector syntax (true/false)
ServerTime
myGlobal.ServerTime(true);
Allow the server to send the current time to the clients (true/false)
SecureHandshake
myGlobal.SecureHandshake(true);
Performs a security handshake when connecting into a cluster
ConnectionDelay
myGlobal.ConnectionDelay(2000);
When the server has exceeded the connection count, how long to hold on to the connection before disconnecting
SupportVersion2Clients
myGlobal.SupportVersion2Clients (true);
Allow the server to support older clients (true/false)
SendRealmSummaryStats
myGlobal.SendRealmSummaryStats (true);
If true sends the realms status summary updates (true/false)
AuditSettings
RealmMaintenance
myAudit.RealmMaintenance (false);
Log to the audit file any realm maintenance activity
InterfaceManagement
myAudit.InterfaceManagement (false);
Log to the audit file any interface management activity
ChannelMaintenance
myAudit.ChannelMaintenance (false);
Log to the audit file any channel maintenance activity
QueueMaintenance
myAudit.QueueMaintenance (false);
Log to the audit file any queue maintenance activity
ServiceMaintenance
myAudit.ServiceMaintenance (false);
Log to the audit file any service maintenance activity
JoinMaintenance
myAudit.JoinMaintenance(false);
Log to the audit file any join maintenance activity
RealmSuccess
myAudit.RealmSuccess(false);
Log to the audit file any successful realm interactions
ChannelSuccess
myAudit.ChannelSuccess(false);
Log to the audit file any successful channel interactions
QueueSuccess
myAudit.QueueSuccess(false);
Log to the audit file any successful queue interactions
ServiceSuccess
myAudit.ServiceSuccess(false);
Log to the audit file any successful realm interactions
JoinSuccess
myAudit.JoinSuccess(false);
Log to the audit file any successful join interactions
RealmFailure
myAudit.RealmFailure(false);
Log to the audit file any unsuccessful realm interactions
ChannelFailure
myAudit.ChannelFailure(false);
Log to the audit file any unsuccessful channel interactions
QueueFailure
myAudit.QueueFailure(false);
Log to the audit file any unsuccessful queue interactions
ServiceFailure
myAudit.ServiceFailure(false);
Log to the audit file any unsuccessful service interactions
JoinFailure
myAudit.JoinFailure(false);
Log to the audit file any unsuccessful join interactions
RealmACL
myAudit.RealmACL(false);
Log to the audit file any unsuccessful realm acl interactions
ChannelACL
myAudit.ChannelACL(false);
Log to the audit file any unsuccessful channel acl interactions
QueueACL
myAudit.QueueACL(false);
Log to the audit file any unsuccessful queue acl interactions
ServiceACL
myAudit.ServiceACL(false);
Log to the audit file any unsuccessful service acl interactions
ClientTimeoutValues
EventTimeout
myClientTimeout.EventTimeout (10000);
The amount of ms the client will wait for a response from the server
DisconnectWait
myClientTimeout.DisconnectWait (30000);
The maximum amount of time to wait when performing an operation when disconnected before throwing session not connected exception
TransactionLifeTime
myClientTimeout.TransactionLifeTime (10000);
The default amount of time a transaction is valid before being removed from the tx store
KaWait
myClientTimeout.KaWait(10000);
The amount of time the client will wait for keep alive interactions between server before acknowledging disconnected state
LowWaterMark
myClientTimeout.LowWaterMark (200);
The low water mark for the connection internal queue. When this value is reached the outbound internal queue will again be ready to push event to the server
HighWaterMark
myClientTimeout.HighWaterMark (500);
The high water mark for the connection internal queue. When this value is reached the internal queue is temporarily suspended and unable to send events to the server. This provides flow control between publisher and server.
QueueBlockLimit
myClientTimeout.QueueBlockLimit (5000);
The maximum number of milliseconds a queue will have reached HWM before notifying listeners
QueueAccessWaitLimit
myClientTimeout.QueueAccessWaitLimit (10000);
The maximum number of milliseconds it should take to gain access to a queue to push events before notifying listeners
QueuePushWaitLimit
myClientTimeout.QueuePushWaitLimit (12000);
The maximum number of milliseconds it should take to gain access to a queue and to push events before notifying listeners
ClusterConfig
HeartBeatInterval
myCluster.HeartBeatInterval (60000);
Heart Beat interval in milliseconds
SeparateLog
myCluster.SeparateLog(true);
Create a separate log file for cluster events
EventsOutStanding
myCluster.EventsOutStanding (10);
Number of events outstanding
EventStorage
CacheAge
myEventStorage.CacheAge(360000);
The time in ms that cached events will be kept in memory for
ThreadPoolSize
myEventStorage.ThreadPoolSize(2);
The number of threads allocated to perform the management task on the channels
ActiveDelay
myEventStorage.ActiveDelay(1000);
The time in milliseconds that an active channel will delay between scans
IdleDelay
myEventStorage.IdleDelay(60000);
The time in milliseconds that an idle channel will delay between scans
FanoutValues
ConcurrentUser
myFanout.ConcurrentUser(5);
The number of client threads allowed to execute concurrently in the server
KeepAlive
myFanout.KeepAlive(60000);
The number of milliseconds between the server will wait before sending a heartbeat
QueueHighWaterMark
myFanout.QueueHighWaterMark(500);
The number of events in a client output queue before the server stops sending events
QueueLowWaterMark
myFanout.QueueLowWaterMark(200);
The number of events in the clients queue before the server resumes sending events
MaxBufferSize
myFanout.MaxBufferSize(1024000);
The maximum buffer size that the server will accept
OutputBlockSize
myFanout.OutputBlockSize(200);
The size of the output block size
PublishDelay
myFanout.PublishDelay(100);
How long to delay the publisher when subscribers queue start to fill, in milliseconds
RoundRobinDelivery
myFanout.RoundRobinDelivery(true);
Use a round robin approach to event delivery (true/false)
PublishExpiredEvents
myFanout.PublishExpiredEvents(true);
Publish expired events at server startup (true/false)
JoinConfig
MaxEventsPerSchedule
myJoinConfig.MaxEventsPerSchedule (200);
Number of events that will be sent to the remote server in one run
MaxQueueSizeToUse
myJoinConfig.MaxQueueSizeToUse (50);
The maximum events that will be queued on behalf of the remote server
ActiveThreadPoolSize
myJoinConfig.ActiveThreadPoolSize (4);
The number of threads to be assigned for the join recovery
IdleThreadPoolSize
myJoinConfig.IdleThreadPoolSize (2);
The number of threads to manage the idle and reconnection to remote servers
RecoveryDaemon
ThreadPool
myRecovery.ThreadPool(5);
Number of threads to use for client recovery
EventsPerBlock
myRecovery.EventsPerBlock(300);
The number of events to send in one block
TransactionManager
MaxTransactionTime
myTXMgr.MaxTransactionTime (1000);
Time in milliseconds that a transaction will be kept active
MaxEventsPerTransaction
myTXMgr.MaxEventsPerTransaction (1000);
The maximum number of events per transaction, a 0 indicates no limit
TTLThreshold
myTXMgr.TTLThreshold(1000);
The minimum time in milliseconds, below which the server will not store the Transaction ID
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