Share a quick JSON (anti) serialized open source Project Jil

We don't lack a JSON serialization library, but we don't have a very good library, which is very important for a Web site. Today, I found Jil.

He's an open source code: Https://github.com/kevin-montrose/Jil

On his homepage There is a detailed description of its performance, I do not repeat here, his most important feature is the performance, emit that certainly not less, when want to let him beyond the other Kuguang a emit certainly not, he has a lot of other optimizations.

• Public buffers

To introduce the pressure of GC, he used a function buffer such as Builder.commoncharbuffer, Builder.commonstringbuffer is also such an application.

• Inline

Many of the methods are labeled [MethodImpl (methodimploptions.aggressiveinlining)] so that the compiler can inline as much as possible.

• Reduce calculations

For example, to convert int to string, the original code is written in this way.

1 [MethodImpl (methodimploptions.aggressiveinlining)]2         Static void_customwriteint (TextWriter writer,intNumberChar[] buffer)3         {4             //Gotta special case This, we can ' t negate it5             if(Number = =int. MinValue)6             {7Writer. Write ("-2147483648");8                 return;9             }Ten  One             varPTR = inlineserializer<Object. Charbuffersize-1; A  -             varcopy =Number ; -             if(Copy <0) the             { -copy =-copy; -             } -  +              Do -             { +                 varIX = copy%Ten; ACopy/=Ten; at  -BUFFER[PTR] = (Char)('0'+ix); -ptr--; -} while(Copy! =0); -  -             if(Number <0) in             { -BUFFER[PTR] ='-'; toptr--; +             } -  theWriter. Write (buffer, PTR +1, inlineserializer<Object. Charbuffersize-1-ptr); *}

I think it's a good thing, but they're still making progress and changing it like this:

1 [MethodImpl (methodimploptions.aggressiveinlining)]2         Static void_customwriteint (TextWriter writer,intNumberChar[] buffer)3         {4             varPTR = inlineserializer<Object. Charbuffersize-1;5 6             UINTcopy;7             if(Number >=0)8copy = (UINT) number;9             ElseTen             { OneWriter. Write ('-'); Acopy =1+ (UINT)~Number ; -             } -  the              Do -             { -                 varIX = copy% -; -Copy/= -; +  -                 varchars =Digitpairs[ix]; +buffer[ptr--] =chars. Second; Abuffer[ptr--] =chars. First; at} while(Copy! =0); -  -             if(Buffer[ptr +1] =='0') -++ptr; -  -Writer. Write (buffer, PTR +1, inlineserializer<Object. Charbuffersize-1-ptr); in}

Among them, what is that digitpairs?

1 structtwodigits2         {3              Public ReadOnly CharFirst ;4              Public ReadOnly CharSecond;5 6              PublicTwodigits (CharFirstCharsecond)7             {8First =First ;9Second =second;Ten             } One         } A  -         Private Static ReadOnlytwodigits[] Digitpairs; -  the         StaticMethods () -         { -Digitpairs =Newtwodigits[ -]; -              for(varI=0; I < -; ++i) +Digitpairs[i] =NewTwodigits ((Char)('0'+ (I/Ten)), (Char)+('0'+ (i%Ten))); -}

Is the idea very high?

• Reduce judgment

The original method was this.

1 Static BOOLIswhitespace (intc)2         {3             //perHttp://www.ietf.org/rfc/rfc4627.txt4             //insignificant whitespace in JSON is defined as5             //\u0020-space6             //\u0009-tab7             //\u000a-new Line8             //\u000d-carriage return9 Ten             return Onec = =0x20|| Ac = =0x09|| -c = =0x0A|| -c = =0x0D; the}

Can change, haha, in fact, I want to change, do not know right? Because I think most of the time is not blank, so I have to judge 4 times to return, and I changed to this:

1 Static BOOLIswhitespace (intc)2         {3             //perHttp://www.ietf.org/rfc/rfc4627.txt4             //insignificant whitespace in JSON is defined as5             //\u0020-space6             //\u0009-tab7             //\u000a-new Line8             //\u000d-carriage return9 Ten             return OneC <0x21&& ( Ac = =0x20|| -c = =0x09|| -c = =0x0A|| thec = =0x0D); -}