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void DeliverMessage(string theAddress, string theMessage) { // send message... } public string LookupAddress(string theRecipientName) { if (recipients.ContainsKey(theRecipientName) ) return recipients[theRecipientName] as string; else { // lookup recipient's address in Directory Service string address = DirectoryService.Lookup(theRecipientName); recipients.Add(theRecipientName, address); return address; } } // this method executes on the incoming thread. If the sender // is in the same process, it will execute on the sender's thread public void SendMessage(string theRecipientName, string theMessage) { // get recipient's address string address = LookupAddress(theRecipientName); // add incoming message to queue QueuedItem item = new QueuedItem(address, theMessage); lock(incomingMessages) { incomingMessages.Enqueue(item); } } } Listing 8-6. Queuing Messages in the Messaging Component, in VB .NET Imports System.Threading Public Class MessageQueue ' items of this type are put in the queue Class QueuedItem Public address As String ' address of recipient Public message As String ' message to deliver Public Sub New(ByVal theAddress As String, ByVal theMessage As String) address = theAddress message = theMessage End Sub End Class Private recipients As New Hashtable Private incomingMessages As New Queue Private deliveryThread As Thread ' key is name, value is address ' the message queue ' handles delivery to recipients

You can only disable a window if no job uses that window or if the window isn t open. If the window is open, you can disable it by using the DISABLE procedure with the FORCE=TRUE attribute. You can drop a window by using the DROP_WINDOW procedure. If a job associated with a window is running, a DROP_WINDOW procedure will continue to run through to completion, and the window is disabled after the job completes. If you set the job s STOP_ON_WINDOW_CLOSE attribute to TRUE, however, the job will immediately stop when you drop an associated window. If you use the FORCE=TRUE setting, you ll disable all jobs that use that window.

You can map each Scheduler job class to a specific resource consumer group. A resource plan is assigned to a resource consumer group, and thus indirectly to each job class as well, by the Database Resource Manager. The active resource plan (as determined by the currently open window) will apportion resources to groups, giving different levels of resources to different jobs, based on their job class. The Scheduler works closely with the Database Resource Manager to ensure proper resource allocation to the jobs. The Scheduler will start a job only if there are enough resources to run it. Within each Scheduler window, you can have several jobs running, with varying degrees of priority. You can prioritize jobs at two levels class and job. The prioritization at the class level is based on the resources allocated to each resource consumer group by the currently active resource plan. For example, the FINANCE_JOBS class might rank higher than the ADMIN_JOBS class, based on the resource allocations dictated by its active resource plan. Within the FINANCE_JOBS and ADMIN_JOBS classes, there will be several individual jobs. Each of these jobs has a job priority, which can range from 1 to 5, with 1 being the highest priority. You can use the SET_ATTRIBUTES procedure to change the job priority of any job, as shown here: SQL> BEGIN dbms_scheduler.SET_ATTRIBUTE( NAME => 'test_job', ATTRIBUTE => 'job_priority', VALUE => 1); END; The default job priority for a job is 3, which you can verify with the following query: SQL> SELECT job_name, job_priority FROM dba_scheduler_jobs; JOB_NAME JOB_PRIORITY ------------------------------ --------------------ADV_SQLACCESS1523128 3 ADV_SQLACCESS5858921 3 GATHER_STATS_JOB 3 PURGE_LOG 3 TEST_JOB03 3 TEST_JOB1 3 6 rows selected SQL>

When you have more than one job within the same class scheduled for the same time, the job_priority of the individual jobs determines which job starts first.

Private _stopDeliveryRequested As Boolean Public Sub StopDelivery() _stopDeliveryRequested = True End Sub Public Sub New() deliveryThread = New Thread(New ThreadStart(AddressOf MessageProcessor)) deliveryThread.Start() End Sub Sub MessageProcessor() While Not _stopDeliveryRequested ProcessNextMessage() Thread.Sleep(10) 'pause for 10 ms End While End Sub ' this method executes on the outgoing thread Sub ProcessNextMessage() Dim item As QueuedItem If incomingMessages.Count = 0 Then Return SyncLock (incomingMessages) item = DirectCast(incomingMessages.Dequeue(), QueuedItem) End SyncLock DeliverMessage(item.address, item.message) End Sub Sub DeliverMessage(ByVal theAddress As String, ByVal theMessage As String) ' send message... End Sub Public Function LookupAddress(ByVal theRecipientName As String) As String If (recipients.ContainsKey(theRecipientName) ) Then Return CStr(recipients(theRecipientName) ) Else ' lookup recipient's address in Directory Service Dim address As String = DirectoryService.Lookup(theRecipientName) recipients.Add(theRecipientName, address) Return address End If End Function ' this method executes on the incoming thread. If the sender ' is in the same process, it will execute on the sender's thread Public Sub SendMessage(ByVal theRecipientName As String, _ ByVal theMessage As String) ' get recipient's address Dim address As String = LookupAddress(theRecipientName) ' add incoming message to queue Dim item As New QueuedItem(address, theMessage)