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Evolution is a natural part of any contract. Over time, everything becomes obsolete, insufficient, or broken. APIs and SPIs are not exceptions. It s better to be prepared for evolution and to plan for it, avoiding the mistakes that would otherwise be difficult to undo. In the case of an API that offers methods to clients, there are no problems with additions. Adding new methods to remove a file from a playlist cannot break binary compatibility. It can simply please clients of the new version of XMMS s API. They have more possibilities, more choices, and they can either use them or not. This is a win-win strategy for extending client APIs. In the case of APIs for providers, the situation is exactly the opposite. Adding new methods to an interface that others must provide effectively breaks all existing implementations because they have not implemented them! On the other hand, it s acceptable and valid to stop calling, thus essentially removing a method from this kind of interface. If the operation flow was not part of the contract, not calling one method would not break much.

A crude but effective trick when powering 5V circuitry from a 6V battery is to put one or two diodes in series with the supply. The typical forward voltage drop of 0.4V per diode brings the 6V down to a more ideal 5.2V and you get reverse polarity protection for free.

The JVM can load classes that don t implement all methods of the interfaces that they implement without linkage errors. The error occurs later, when a missing method is called. Then a java.lang. AbstractMethodError is raised when the call to the undefined method is made. Although not recommended by this book, this can be acceptable if the caller of the method is also adding it. Then it can always surround the call with a proper exception catch.

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For these readily available cells, there are also rechargeable equivalents which we d encourage you to consider to reduce landfill. Bear in mind that the base cell voltage is lower for nickel-cadmium (NiCd) or nickel-metal hydride (NiMH) cells at 1.25V per cell, so an AA NiCd will provide around 1.3V when fully charged versus 1.5 1.6V for an alkaline. Sealed lead acid (SLA) batteries are an attractive option. While heavier, they have, depending on size, the ability to supply several amps for a few hours or more good if you re building a robot, for example. The strength of SLA batteries can be a weakness if things go wrong that same ability to provide high currents can result in melted wires or circuit boards if things go amiss. Accordingly, we strongly encourage you to put a fuse in the circuit, as near the battery as practicable, if you use an SLA. Constructing your own charger circuit is beyond the scope of this book, but good resources are available on the Internet. For most applications, it s likely to be simpler to just swap the batteries out into a commercial charger.

In addition to the methods you ve already seen all() and filter() it has a large number of other methods that can return single specific objects, return lists of objects, return other data structures corresponding to data stored by a model, change the ordering used to return results, and handle a variety of other useful tasks Full documentation of the database API and all of its methods and options is available online at wwwdjangoprojectcom/documentation/db-api/ If you don t specify a manager for your model, Django adds one and calls it objects (this happens automatically for any class that subclasses djangodbmodelsModel) However, you re free to attach a manager with any name you like, and if you do, Django won t bother with the automatic default objects manager For example, you could define a model like so: class MyModel(modelsModel): name = models.

The path of evolution depends on the type of interface: additions to an API are acceptable, while removing functionality is not. In SPIs removals are allowed, while additions are not. When producing a contract, you must understand which pieces form part of the API that clients will call and which pieces are part of the SPI that will extend the functionality that you are writing. The biggest mistake that you can make is to mix API and SPI together within a single class. If you do that, you have not created any room for evolution. Adding a method is forbidden because of the contract for SPIs and removing is forbidden because of the contract for APIs. Always separate your API from your SPI.

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