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An adapter is an interface converter. It can be an independent hardware interface device, allowing hardware or electronic interfaces to be connected with other hardware or electronic interfaces, or it can be an information interface. For example: power adapter, tripod base adapter, USB and serial port adapter, etc.

Basic meaning

In a computer, an adapter is usually built into a card (or an external card) that can be inserted into a slot on the motherboard. The adapter information in the card is exchanged with the processor and the devices supported by the adapter.

The power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances. It is generally composed of shell, power transformer and rectifier circuit. It can be divided into AC output type and DC output type according to its output type; According to the connection mode, it can be divided into wall inserting type and desktop type. The power adapter is particularly important for mobile PCs because they do not have batteries.

The power adapter of most mobile PCs can automatically detect 100~240V AC (50/60Hz). Basically, all mobile PCs have an external power supply, which is connected to the host with a single line. This can reduce the size and weight of the host. Only a few models have a built-in power supply in the host. There is a nameplate on the power adapter, which indicates power, input/output voltage, current and other indicators. Pay special attention to the range of input voltage, which is called "travel power adapter".

When MBeans are registered to the MBean server, they need protocols to interoperate with these MBeans and retrieve information for requests from the management application. This is enabled through the protocol adapter, which can convert management application data into standard protocol information.

The protocol adapters supported by multi protocol proxy include SNMP, TL1, RMI, CORBA, HTTP and HTML adapters.

In the actual development process, we often encounter such things. We have developed a base class based on the preliminary requirements, and only in the development process did we learn about the detailed requirements or changes in requirements. However, the interfaces in the development work have already been defined and have been coded on a large scale. At this time, changing the definition of the interface will result in many repetitive modifications in the coding, and may further lead to semantic errors or logic errors caused by incomplete modifications. Semantic errors can still be found in the compilation phase. Once a logical error occurs, the consequences will be very serious, even enough to cause the system to crash. At this point, you need to use the adapter pattern design method.

Adaptation mode

In computer programming, the adapter pattern (sometimes called a wrapper style or wrapper) adapts the interface of a class to what the user expects. An adaptation allows classes that usually cannot work together because of incompatible interfaces to work together, by wrapping the class's own interface in an existing class.

The adapter pattern is mainly used when the methods defined in the interface cannot meet the customer's needs, or when the name of the method defined in the interface or the method interface conflicts with the customer's needs.

Two types of patterns: object adapter pattern - in this adapter pattern, an adapter holds an instance of the class it wraps. In this case, the adapter calls the physical entity of the wrapped object. Class adapter pattern - In this adapter pattern, adapters inherit from implemented classes (generally multiple inheritance).

The adapter does not have the data rate conversion function.

In computer programming, adapters include container adapters, iterator adapters, functional adapters, etc.

How to use adapter mode:

A class inherits the interface and the known class at the same time, and uses the methods and properties defined in the known class to implement the definition in the interface (mainly using the method of overloading the interface methods). Use this class as the base class of other business classes, that is, this class adapts to interfaces and known classes. If the known class changes, just modify the class adapter to meet the implementation of the interface.

Adapter type: needle adapter

In April 2016, released a new generation of wireless display adapter in China: Wireless Display Adapter V2. According to Microsoft, the adapter has been further optimized and improved in terms of improving device compatibility, reducing signal delay, and small and portable design, while fully retaining the advantages of the previous generation's lightweight and easy-to-use products. Even in the non network environment, it can still be used smoothly, and is an indispensable companion for modern meetings and life entertainment.

purpose

A laboratory centrifuge can usually be equipped with multiple rotors with different capacities. When the same centrifuge needs to be equipped with two rotors of the same type but with different capacities, it can be considered to put an adapter in the large capacity test tube hole to reach the test tube hole suitable for small capacity test tubes. In this way, only the large capacity rotor and a set of adapters can meet the requirements, which can avoid the complex process of disassembly when replacing the rotor, It also saves money, because the price of a set of adapters is far lower than that of a rotor.

A host adapter or a host bus adapter (HBA) is a computer hardware that takes a computer as the host system and connects to other networks or storage devices. The term mainly refers to devices that connect SCSI, Fibre Channel, or eSATA devices. However, devices that connect IDE, Ethernet, FireWire, USB, or other systems may also be referred to as host adapters.