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By making collectionsSequence the base class, the isinstance() test will now return True Furthermore, we will be required to implement __init__() (or __new__()), __getitem__(), and __len__() (which we do) The collectionsSequence ABC also provides concrete (ie, nonabstract) implementations for __contains__(), __iter__(), __reversed__(), count(), and index() In the case of SortedList, we reimplement them all, but we could have used the ABC versions if we wanted to, simply by not reimplementing them We cannot make SortedList a subclass of collectionsMutableSequence even though the list is mutable because SortedList does not have all the methods that a collectionsMutableSequence must provide, such as __setitem__() and append() (The code for this SortedList is in SortedListAbcpy We will see an alternative approach to making a SortedList into a collectionsSequence in the Metaclasses subsection) Now that we have seen how to make a custom class t in with the standard ABCs, we will turn to another use of ABCs: to provide an interface promise for our own custom classes We will look at three rather different examples to cover different aspects of creating and using ABCs We will start with a very simple example that shows how to handle readable/writable properties The class is used to represent domestic appliances Every appliance that is created must have a read-only model string and a readable/writable price We also want to ensure that the ABC s __init__() is reimplemented Here s the ABC (from Appliancepy); we have not shown the import

Technically, the methods just discussed set only the current displayable of class Display During the lifecycle of the application the current Displayable never again is null after it has been initially set at application startup The current Displayable is made visible by the device software referred to as application management software (AMS) in MIDP Specification (see Section 192, "MIDP System Software") The current Displayable is visible when the application is in the foreground

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service identity before establishing a secure channel between client and service This validation protects against man-in-the-middle and spoo ng attacks

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There often are, however, situations when the application management software moves the application to the background, and thus the current Displayable is not actually visible The current Displayable does not change in these cases Applications are commonly moved to background upon system events such as incoming calls in a phone device or upon certain other system notifications When the application management software decides that the application can again be brought to the foreground, the current Displayable is simply made visible

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Encryption Using SSL SSL is a convenient, secure way to encrypt communications It s well understood by IT organizations, it is rewall friendly, and there are many management and performance tools on the market Using SSL with enables the broadest reach of a secure Web service SSL requires a digital certi cate with an asymmetrical (public/private) key to establish an encrypted pathway After it is established, SSL uses this pathway, with a more ef cient symmetric encryption algorithm, to encrypt messages going both ways on the channel A digital certi cate can be obtained from a number of sources There are public entities, such as Verisign, that issue certi cates for testing and production purposes Windows Server itself ships with a certi cate issuing service, so you can generate your own certi cates that can be trusted by your organization or partners In addition, NET ships with a utility, MakeCert, which generates certi cates for testing purposes

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The application can determine whether a Displayable is visible on the display by calling the method isShown In the case of Canvas and CustomItem, the showNotify and hideNotify methods are called when the component is made visible and is hidden, respectively Applications need to override showNotify and hideNotify methods in Canvas or CustomItem subclasses to be able receive these notifications

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