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Figure 13-17. The wiring diagram of the Parts Scheduling system The system uses class Router to encapsulate access to the remote message queues. Router contains no business logic. When an incoming message is posted to the AsapOrders queue, Router fires an event to FormMain. The event notification is sent on a background thread and contains a WorkOrder as the payload. FormMain gives the WorkOrder to WorkerPartsList, which stores the order in a Hashtable. FormMain runs a timer with one-second ticks. On each tick, FormMain checks WorkerPartsList for new orders. If any are found, they are added to the ListView on the right side of FormMain.

You manually adjusted the column widths and applied formatting to the cells in your pivot table. However, your pivot table formatting is lost when you refresh the pivot table or change the pivot table layout. Even changing the report filter causes the formatting to be lost. This example is based on the LoseFormat.xlsx workbook.

in this book use an OCI driver on a 10g Release 1 database, but the basic concepts should remain the same with a thin driver.

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// class FormMain public class FormMain : System.Windows.Forms.Form { // // manages connections to incoming and outgoing message queues Router router; // manages a list of scheduled parts WorkerPartsList partsList = new WorkerPartsList(); public FormMain() { InitializeComponent(); System.Threading.Thread.CurrentThread.Name = "User Interface"; router = new Router(); router.OnMessage += new Router.MessageHandler(HandleOrder); Thread partsListMonitor = new Thread(new ThreadStart(CheckPartsList)); partsListMonitor.IsBackground = true; partsListMonitor.Name = "PartsListMonitor"; partsListMonitor.Start(); DisplayScheduledParts(); ShowVehiclesReadyForAssembly(); } bool removingPartsFromPartsList; void CheckPartsList() { while (true) { ArrayList workOrdersReady = partsList.GetWorkToAssemble(); if (workOrdersReady == null) { Thread.Sleep(100); continue; } else { // lock out DisplayScheduledParts from running temporarily removingPartsFromPartsList = true; // send all ready WorkOrders to next queue foreach (WorkOrder workOrder in workOrdersReady) { partsList.Remove(workOrder); router.SubmitForAssembly(workOrder); }

Proxy authentication allows you to connect on behalf of another user without supplying the user s password (provided appropriate privileges have been granted to enable this). The way proxy authentication works is simple. You create an OCI connection pool consisting of connections of the proxy user account. Then you can create sessions on top of these physical connections for the individual database users (as demonstrated in the previous chapter). This solves the problem of password management simply by not requiring the proxied user s password. For example, assume that the proxy account is called midtier, and you want to create two sessions of db_clerk1 and one session of db_manager1 on top of a single physical connection from the pool of midtier connections. Figure 15-4 shows one such proxy connection carrying three of these sessions.

removingPartsFromPartsList = false; } } } //

Most formatting can be preserved if you change the Format options in the PivotTable Options dialog box. 1. Right-click a cell in the pivot table, and then choose PivotTable Options. 2. On the Layout & Format tab, in the Format options, remove the check mark from Autofit Column Widths on Update. This prevents the column width from changing, if you have manually adjusted it. 3. Add a check mark to Preserve Cell Formatting on Update, and then click OK. Then, when you apply formatting, do the following: 1. Ensure that Enable Selection is turned on (as shown in Figure 4-7). 2. Unless you want to format a single cell, use the pivot table selection technique to select the elements you want to format (point to the top or left edge of the element, and then click when the black arrow appears).

Single Proxy Connection Carrying Three Sessions midtier Connection db_clerk1 Session db_clerk1 Session db_manager1 Session

[STAThread] static void Main() { Application.Run(new FormMain()); } private void HandleOrder(WorkOrder theWorkOrder) { // a WorkerOrder has arrived. Add three parts for it, with // hard-coded delivery dates if (theWorkOrder == null) return; // pretend the work order has three parts partsList.AddPart(theWorkOrder, "Part 1", DateTime.Now.AddSeconds(3)); partsList.AddPart(theWorkOrder, "Part 2", DateTime.Now.AddSeconds(6)); partsList.AddPart(theWorkOrder, "Part 3", DateTime.Now.AddSeconds(9)); } private void timerUpdatePartsScheduled_Tick(object sender, System.EventArgs e) { DisplayScheduledParts(); ShowVehiclesReadyForAssembly(); } int scheduledPartsDisplayed = 0; private void DisplayScheduledParts() { if (removingPartsFromPartsList) return; // can't display the list while it's being changed if (scheduledPartsDisplayed == partsList.TotalNumberOfScheduledParts) return; listViewPartsSchedule.Items.Clear(); foreach (ArrayList parts in partsList.List.Values) { foreach (ScheduledPart part in parts) { ListViewItem item = new ListViewItem(part.workOrder.Id); item.SubItems.Add(part.part); item.SubItems.Add(part.deliveryDate.ToString("yyyy-MM-dd HH:mm:ss")); listViewPartsSchedule.Items.Add(item); }

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