Blog notes finishing [...] continually updated

Java basic summary

• Java basic grammar summary

  Win10 including mounting JDK8, data type variables, operators, array

• Why do you need to define data types? ? ?

• Java object-oriented features summary

  Encapsulation, inheritance, polymorphism

• Dynamic reference memory - a set of defined set && precise - Generic

  Java collections, also known as container, can be dynamically referenced objects stored in the container. (Flexible and scalable)

  What is a generic?

  Parameterized type! ! !
  What is a parameterized type? ? ?
  The specific type (e.g., String, Integer) Parameter abstracted.

• Data write API - IO stream

  It refers IO Input and Output, the main aim is to achieve the transfer of data between storage media. [Flow: a data stream, the flow stream in analogy]

• && && reflection enumeration class notes

  In the example of the need for a class or a plurality of relatively fixed and when using enumeration class.

  Annotation is actually a code of special markers , these markers can be compiled, class loading, it is read runtime and executes the corresponding processing.

  Reflection Reflection API allows a program to make any type of internal information by means of operation, and internal properties and methods of any object can be directly operated. (Highest authority)

MySQL Notes

• MySQL basic summary

  Including MySQL introduced, under Linux installation MySQL remote connections, MySQL common commands, data types, operators

• MySQL table design specifications

  Common specifications include the design of the table, such as the prohibition pictures stored in the database, such as large binary data files, such as the three major paradigms

• MySQL indexing and development specifications

  The single table index is preferably not more than 5, the index is preferably added to the where clause

JVM notes

• JVM memory structure

  Memory structure including thread public and private thread, the thread which includes public heap, the method area, runtime constant pool, private thread stack, including virtual machine, native method stacks and program counter

• GC collection algorithm && GC collector

  Including labeling algorithm: reachability analysis algorithm, GC Roots object, four, garbage collection algorithm, suitable for old age mark sweep algorithm and tags to organize algorithm for the young generation of replication algorithm and the "local conditions" generational algorithm

  Including seven kinds of collector, single-threaded recovered Serial and Serial Old collector, multi-threaded Parallel Scavenge collector and Parallel Old and popular CMS and G1 collector.

  jdk8 default Parallel Scavenge new generation collector and recycler years old Parallel Old

• JVM parameters && command tool

  JVM tuning object is to ensure that certain a certain case as much as possible to reduce the number of GC

  Recommended arranged to stack memory and heap memory initialization maximum set to the same value, increased memory space element

  VisualVM visualization tool for monitoring the operation of the JVM

• JVM class loading mechanism

  Process involves loading class loading, verification, preparation, resolution, initialization

  In order to avoid repeated loading class, JVM using parents delegation model, priority will be submitted to the parent class loader class loader loading the class to avoid repeated loading, class unified

SpringBoot notes

• SpringBoot——HelloWorld

  Micro service monomer is used in business development to a certain size evolution strategy.

  Including SpringBoot project build process engineering, RestController complex notes, pom dependency analysis and simple deployment.

• SpringBoot - Web development (static resource mapping)

  WebMVCAutoConfiguration static mapping rules, custom favicon, banner

• [ SpringBoot - Web Development (using Thymeleaf template engine)]

  thymeleaf jump rule, CRUD test

• SpringBoot integrated Druid connection pool

  Connection pooling by omitting (multiplexing) the process of creation and destruction connected connection (three-way handshake and the four-way handshake when destroyed when the TCP connection is established), thereby improving performance.

  Arrogant Druid (claimed on the GitHub Wiki is the best Java language database connection pool)

• SpringBoot integrated Redis cache

  Enhance access efficiency duplicate access to data.

  Redis application scenarios (for data is repeatedly accessed)

  • Page cache (images, CSS, html and other static data) - hot data
  • Current list
  • Leaderboard
  • counter
  • session storage

SpringCloud notes

• Service registration component --Eureka build high availability clusters

  Micro unified call service

• Ribbon implement client load balancing

  Implementation of the client load balancing

• Fuse Hystrix

  Hystrix is an implementation of fault tolerance components. [Abandoned the vehicle and insurance handsome]

• Fuse monitoring Turbine

  The server monitoring the amount of requests

• Nginx + Zuul cluster to achieve high availability gateway

  • Nginx load balancing by polling
  • Zuul achieve high availability through clustering

• && link tracking service monitoring service

  When a request is not available or slow down, the need for timely investigation and the failure point of service has become a major storm micro-service maintenance.

• Distributed Configuration Center Apollo - QuickStart

  Apollo addition to the full-featured, in the domestic popularity is quite extensive

Design Patterns notes

• Design Mode entry notes (1.1)

  Is a design pattern for code design of lessons learned , the main scenario is in building large applications on

• Seven principles of design patterns (1.2)

  The purpose of design principles is to build a more stable and robust software, around seven principles of loose coupling and scalability to expand.

• UML class diagram (1.3)

  Five relationships of dependency by some examples

• Create a schema ---- singleton (2.1)

  Singleton defined: in the software system, an object instance of a class has only one. [DoubleCheck, static inner classes, enumeration]

• ---- factory pattern to create a schema (2.2)

  Plant is used to produce, whereas in Java, is used to produce object instance

• Create a schema ---- prototype model (2.3)

  In simple terms, by copying create objects the way. (Copied object can be understood as a template)

  Deep Copy: copy the type of problem solving reference.

• Create a schema ---- builder mode (2.4)

  In simple terms, the builder pattern to create objects + = attribute assignment.

  Builder mode for creating class contains a number of parameters and require customized case.

• Create a schema summary (2.x)

  As the name suggests, creates the focal point in a Model of how to create objects can be separated to maximize the creation and use of objects and thus reduce the coupling system.

• Structural model ---- Decorator (3.1)

  Mode decorative purposes - the core portion and the decorative portion may be freely combined. '

Architecture design reading notes

• "Architecture school from scratch," notes - Part 1: concepts and basic

  Suitable better than the industry-leading.

  Simple is better than complex.

  Evolution than in one step.

• "Architecture school from scratch," notes - Part II: high-performance and high-availability architecture model

  Storage, computing, high-performance and high-availability common strategies

• Notes "from scratch learning architecture" - Part III: scalable architecture model

  The evolution of a layered architecture, SOA, micro Services Architecture

• "Architecture school from scratch," notes - Part IV: Architecture combat

  Weigh the essence of technology in business and the cost of seeking a balance between.