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There aren t many ways of fixing problems of this kind First, you might try to define a policy ; that is, add into the Javadoc a huge warning that the implementors of the class have to guarantee consistency In fact, this is better than nothing at all I can assure you, though, that this doesn t really help Maybe it will lower the number of broken implementations by half A huge number will remain and potentially your problems will increase Whenever a client encounters a broken instance, its code is broken, usually with a nondescriptive exception, such as NullPointerException or ArrayIndexOutOfBoundsException To maximize your despair, any information about the broken implementation will be missing, even the relevant class name So, you receive a failure message, but discovering what actually failed might take hours, or sometimes years That s how it goes all the time.

The ID-12 reader module works with Unique tags that output a 5-byte identification code, so normally we would only need tagBytes to be a five-element array However, we ve defined it as having six elements because after reading the tag the sketch calculates the checksum value to make sure there were no read errors, and the checksum is then added to the end as a sixth element The tagValue array is an array of characters, and it needs to be 10 elements long because once the 5byte tag value is converted to an ASCII string it expands to 10 characters As you can see by looking at the list of tags in allowedTags ealier in the program, each one of them is 10 characters long.

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Defining policies is good for the blame game, but not for fixing actual problems A more promising approach is to write a TCK As advocated in the section Test Compatibility Kit in 9, every modular library should be equipped with a test suite that implementors can use to verify that their provided implementations are correct This works, but under one condition only: that all implementors actually run the tests I don t want to sound skeptical, but I m fairly certain that a significant portion of an API s users simply provide the implementation and skip running the tests In the end, they want to be clueless and they want to ignore instructions as far as possible They simply want to get their job done Learning how to set a TCK up is an additional and annoying obstacle, the first to be ignored.

void loop() { byte i = 0; byte val = 0; byte checksum = 0; byte bytesRead = 0; byte tempByte = 0; byte tagBytes[6]; char tagValue[11]; Reading from the RFID module is done with the SoftwareSerial library, which unfortunately doesn t have an equivalent to the Serialavailable() function This means the sketch can t loop indefinitely and check for characters available from the serial port each time it loops through: instead it blocks on waiting for the next character from the port every time it calls rfidread() That s the reason this simple version of the system can t accept commands from the host via the serial console If you sent a command to it, the sketch wouldn t see it until after the next tag read when it loops through and accesses the serial port buffer.

Only those who have burned their fingers in the past know the danger of playing with matches However, in this context you need to spend several days hunting a mysterious bug and then finding that it would have been discovered after only a few minutes by running a.

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