letterform anatomy

Anatomy for Netty 3.2Today, Netty's encoder and decoder (coder its essence or handler) are used to analyze the Netty provided by coder to select or implement my own coder.1. Why do encoder and decoder?As we all know, the network transmits the byte stream, and our object-oriented programming operation is object or basic data type, so we need to convert the object or the basic type to byte before transmitting.The byte is then converted to an object or b

Foreword: PetShop is an example, Microsoft uses it to show. NET Enterprise system development ability. There are many in the industry. NET and the Java EE dispute, many data is from Microsoft's PetShop and Sun's petstore. This argument inevitably has a strong commercial color, for our developers, there is no need to pay too much attention. However, PetShop with the release of the continuous update, to now based on the PetShop4.0 of. Net 2.0, the whole design gradually matured and elegant, but th

the initialization of a session object was established, because it is a new interview. So now there's no data in the session. The session is then read and written in the form of a key/value pair (do not forget that the session has all the dictionary operations), and then save the session by using the Save method. Assuming that the user is not new to the interview, then also according to the above process, only the session initialization when the previous data is taken out to save in the instanc

logical operators logical operators used in [] and test logical operators used in [[]] Description -A And and, both ends are true, then true -O || Or OR, at both ends there is a true and true ! ! Not non, the opposite is true Tips:！ Inverse: A logical value that is opposite to a logical value-A Chinese meaning and (and ): Two logical values are true, the return value is true, and the

Integer two-dollar comparison operator The comparer used in [] and test The comparer used in (()) and [[]] Description -eq = = or = Equal abbreviations, equal -ne != Not equal abbreviations, unequal -gt > Greater than greater than -ge >= Greater than or equal to greater equal -lt Less than than similar -le Less than or equal to

Include/asm/io.h#define OUTB (Value,port) __asm__ ("Outb%%al,%%dx":: "A" (value), "D" (port))//macro definition OUTB with assembly implements write value at port address ports value// The register used is AL, a byte length, and port ports uses a 2byte length address to mark the Register, note that the register here uses a # define INB (port) ({unsigned char _v; __asm__ volatile ("inb %%dx,%%al ":" =a "(_v):" D "(port); _v; })//Here INB is read into a byte-length data at port ports. The read-in d

After my analysis of the spring source code, @PathVariable must use caution, it does make your URL beautiful, but it sacrificed a lot of performance.Spring first in mapping match, match not to start to go @pathvariable fuzzy matchSee Spring Source code abstracthandlermethodmapping 289 Lineprivate void Addmatchingmappings (collectionThis article is from the "Program Ape de banana" blog, please be sure to keep this source http://qiyubin.blog.51cto.com/3642349/1643451Spring Source code

combination of rtti in a language to understand the implementation of the better. In Java, there are: type conversion, class type class, instanceof embodies the rtti.class type Java.lang.ClassClass is an abstraction of all classes and interfaces, such as the name of a class, the interface that a class implements, methods, properties, and so on. You can get information about a class by using the object's class object. This is not a detailed introduction, there are separate blog additions.Class L

, implement Comparable IntegerClass wraps a value of a primitive type in an object int . An Integer object of type contains a int field of type. In addition, the class provides several methods that can be int String converted between types and types, as well as int other constants and methods that are useful when handling types. 39, Internalerror class, error Starting from 1.0 there are Inherit Virtualmachineerror This exception indicates some unexpected internal er

; default: Throw NewNotSupportedException (nameof (options). Mode)); }}View CodeAs shown above, it is the entire process of injecting services and instantiating services. We builserviceprovider call the ServiceProvider class based on the Iservicecollection extension method, and then instantiate the related service.In addition to implementing serviceprovider in this way, there is a defaultserviceproviderfactory in the default ASP. NET Core framework. However, this factory class is f

of all classes, called Metaclass, the Meta class in Python.Leave a question here????????????????????[object.h]#ifdef Py_TRACE_REFS #define _PyObject_EXTRA_INIT 0,0,#else #define _PyObject_EXTRA_INIT#endif#define PyObject_HEAD_INIT(type) _PyObject_EXTRA_INIT 1, typeForeign article: #define学习The \ Backslash extends the definition to the next line, the compiler converts multiple physical rows into a logical line, and deletes the \ symbol#define预处理器指令以 # As the beginning of a line, the ins

only a super scientist who has made outstanding contributions, but is also recognized as a leader in the field of research. As the traditional mainstream of the computer, the database only three Turing Award winners, are the famous characters, the creation of their own era. E.f.codd, one of the big Three, died in 2003, and the father of the database, Bachman, had retired and left academia, and the current study only remaining only Jim Gray: Charles W. Bachman (1973)--databaseEdgar Frank Codd (1

. For the purpose of each function, here's what I do: 1234 USAGE#该函数负责提示用户如何正确使用该脚本start#该函数负责启动脚本stop#该函数负责停止监控脚本restart#该函数负责重启监控脚本 The following script is used:The whole idea of the script is to start a dead loop through the while:;d o statement;done, and then control the cycle interval of the dead loop through sleep in the dead loop. In the specified cycle interval, the log is changed by taking the length of the MySQL slow log as a record point, and then when

endsRegationcolumns for processing, for example, the main logic is as follows: Select AVG (order_id) from T_order processed into select AVG (order_id) [Token (, COUNT (order_id) as Sha rding_gen_1, SUM (order_id) as Sharding_gen_2)] from [Token (T_order)] mostly complements SUM and Count Mysqldeletevisitor Update mysqldeletestatement processing logic adds the current table name and its alias to Routecontext feel and abstractmysqlvisitor the Sqlexprtablesource processing logic has a repeating p

Anatomy of SQL Server sixth to avoid regressions in system tests for Orcamdfhttp://improve.dk/avoiding-regressions-in-orcamdf-by-system-testing/The risk of bugs is increasing as I continue to add new features and new data structures to support the Orcamdf softwareEspecially when I develop a large unknown function, I can't estimate the structure and the structure of the association, in order to reduce the risk, testing is very necessaryUnit TestUnit te

Source code Anatomy of the Django REST Framework authentication method By the Django CBV mode flow, you can know the url匹配完成后，会执行自定义的类中的as_view方法 . If there is no definition in the custom class as_view方法 , depending on the inheritance of classes in the object-oriented class, you can会执行其父类View中的as_view方法 在Django的View的as_view方法中，又会调用dispatch方法。 Now look at the Django Restframework certification process Django Restframework is a Django-based framew

Original: Anatomy of SQL Server end article about Internals Viewer source codeAnatomy of SQL Server end article about Internals Viewer source codeYou may have used the Internals viewer software.Widget for viewing SQL Server Internal Data page Internals ViewerBut don't know how many people have seen his source code?The author put the source code on the CodePlex website, but this source code only supports SQL2008 and below, does not support SQL2008R2Lat

Label:The original: Anatomy of SQL Server sixth to avoid regressions in the system test of OrcamdfAnatomy of SQL Server sixth to avoid regressions in system tests for Orcamdfhttp://improve.dk/avoiding-regressions-in-orcamdf-by-system-testing/The risk of bugs is increasing as I continue to add new features and new data structures to support the Orcamdf softwareEspecially when I develop a large unknown function, I can't estimate the structure and the st

1. jdbc as a starting point 1.1 re-implemented several JDBC interfacesImplement Javax.sql.DataSource Interface ShardingdatasourceImplement Java.sql.Connection Interface ShardingconnectionImplement Java.sql.Statement ShardingstatementImplement Java.sql.PreparedStatement ShardingpreparedstatementImplement Java.sql.ResultSet AbstractshardingresultsetThe re-implemented pattern is the adapter patternSee the following mind map for specific implementation analysis1.2 Processing of aggregation compariso

* values of all segments within the Smaps file is the amount of shared memory that is process accurate!The sum of the private_* values of all the segments in the Smaps file is the total amount of exclusive memory that is process accurate!3 SummaryThrough the above analysis, we can get the following conclusions:The L Top command parses/PROC/L Virt is the total amount of virtual memory requested.L RES is the sum of the physical memory used by the process.L SHR is the sum of the physical memory "ma