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Using an isolation level that s too restrictive results in the locking of resources. When many clients contend for the same resource, they must block until it s their turn. This leads to a natural bottleneck and scalability problem that results in both high latency and reduced overall throughput. So, how can we solve this concurrency problem One solution is to use the optimistic locking design pattern. Optimistic locking isn t locking in the traditional sense. Instead, we assume that no other client is trying to access the same data at the same time. Then, at transaction commit time, we let the database resolve whether the data has been altered by another transaction. If it has, we throw an exception and roll back our transaction. In other words, we are being optimistic that the data hasn t been touched until we need to commit. How does this work How does this avoid table-level locks Well, to use optimistic locking, we have to use a special feature of Java Persistence. The first thing we need to do is model our Account for use in the BankEJB:

Customer myCustomer = dbContext.Customers.Single( cust => cust.CustomerID == 29531); myCustomer.SalesOrderHeaders.Load(); Console.WriteLine(myCustomer.SalesOrderHeaders.Count);

By default, a criteria query returns only the root entity in this case, the Items in the query result. Let s summarize with a full example:

namespace Exercise_13_3 { interface IConvertible { string ConvertToCSharp(string stringToConvert); string ConvertToVB(string stringToConvert); } interface ICodeChecker : IConvertible { bool CheckCodeSyntax(string stringToCheck, string whichLang); }

public void penDown(int x, int y) { if (exitButton.pressed(x,y)){ Graphics.playSound(Graphics.SOUND_CONFIRMATION); System.exit(0); } else if (getButton.pressed(x,y)) { symbolField.loseFocus(); if ((symbolField.getText().length() > 0) && (checkSymbol())) { Graphics.playSound(Graphics.SOUND_STARTUP); String sym = symbolField.getText().toUpperCase(); //later on, get the price from a quote service here int[] price = {75, 55}; //later on, store the price in the database here resultsBox.setText("The price of " + sym + " is $" + price[0] + "." + price[1]); resultsBox.paint(); }

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In the previous examples, you ve added content to a single OCG. This content is visible if the status of the group is on and invisible when it s off. Consider more complex visibility possibilities, with content not belonging directly to a specific layer, but where the visibility depends on the states of different layers.

For example, you might write a class like the one in the following code. It contains a static class called ExtendMyData, which contains a static method called Average, which implements the additional functionality. Notice that the method takes an instance of MyData as a parameter. static class ExtendMyData Instance of MyData class { public static double Average( MyData md ) { return md.Sum() / 3; } } Use the instance of MyData.

The Review model object contains the address and phone number for a restaurant and a link to the full online review. Using ReviewDetail Activity, the user can open the menu and choose to display a map with directions to the restaurant, call the restaurant, or view the full review in a web browser. To allow all of these actions to take place, ReviewDetail launches built-in Android applications through implicit Intent calls. In our new code, we initialize an Intent class instance B so it can be used later by the menu cases. If the user selects the MENU_WEB_REVIEW menu button, we create a new instance of the Intent variable by passing in an action and data. For the action, we use the String constant Intent.ACTION_VIEW, which has the value android.app. action.VIEW. You can use either the constant or the value, but sticking to constants helps ensure that you don t mistype the name. Other common actions are Intent. ACTION_EDIT, Intent.ACTION_INSERT, and Intent.ACTION_DELETE. For the data component of the Intent, we use Uri.parse(link) to create a Uri. We ll look at Uri in more detail in the next section; for now, just know that this allows the correct component to answer the startActivity(Intent i) request C and render the resource identified by the Uri. We don t directly declare any particular Activity or Service for the Intent; we simply say we want to VIEW http://somehost/somepath. Android s late-binding mechanism will interpret this request at runtime, most likely by launching the device's built-in browser. ReviewDetail also handles the MENU_MAP_REVIEW menu item. We initialize the Intent to use Intent.ACTION_VIEW again, but this time with a different type of Uri: "geo:0,0 q=" + street_address D. This combination of VIEW and geo scheme

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