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The method you ll use in views to determine whether submitted data is valid or not is called is_valid() and is defined on the base Form class that all Django forms derive from. Inside the Form class, is_valid() touches off the form s validation routines, in a specific order, by calling full_clean() (another method defined in the base Form class in django.newforms; see Figure 9-1).

It then calls eeprom_write_block() and passes it the parameters to be stored, telling it to start at address 0 (the start of the EEPROM) and giving it the number of bytes that need to be stored It then calls eeprom_write_word() and tells it to begin at the address after the end of the params block and write the CRC value void params_save(void) { uint16_t crc; byte *p; crc=0; p=(byte*)¶ms; for(byte i=0; i<sizeof(params_t); i++) crc+=p[i]; eeprom_write_block((const void*)¶ms, (void*)0, sizeof(params_t)); eeprom_write_word((uint16_t*)sizeof(params_t), crc); } Pulling the config parameters out of EEPROM at startup is really just the same process run in reverse The params_load() function defines some variables, then calls eeprom_read_block() starting at address 0 to fetch the params stored in EEPROM It then reads the stored CRC value using eeprom_read_word(), and then, just as before, it walks through the params to calculate the actual CRC.

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It was no help to show them their code and prove that it was incorrect to start with, or that it had violated the documentation all along It used to work; now it doesn t And it s your fault! We tried to fix the most visible misuses of the API ourselves But we couldn t find them all, because just like a star that doesn t know who is observing it, we were unable to find all the places that incorrectly mixed javaioFile with FileObject Instead, we provided a migration guide that explained how to map the old bad code patterns to new and better ones It still wasn t enough and the complaints were endless In the middle of the release cycle we decided to give up We didn t want to lose our performance enhancements However, the complaints had become overwhelming.

Finally, the stored CRC is compared to the calculated CRC, and if they are equal the program knows everything is good and overwrites the existing params global variable with the values loaded from EEPROM..

We needed to achieve the performance enhancements in a more compatible way We then chose two different techniques to do that In case of potential divergence between caches and the state of the disk, we performed the refresh If there were no signs of such a distinction, we kept the new behavior; that is, we didn t touch the disk at all To do so, we needed to identify the symptoms of potential improper combinations of javaioFile and the FileSystem API We did that with a little help from javalangSecurityManager Desynchronizing caches can only occur if you create or delete a file on disk You can do this either from inside the Java runtime or with external tools, such as /bin/rm However, Java provides a sandbox execution environment and can prevent these two operations if unsecured code performs them.

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