Use incremental construction framework to speed up the compilation of the Java class library

Use incremental construction framework to speed up the compilation of the Java class library Overview: In large Java projects, compiling the entire code library may take a lot of time, especially when the project contains many dependent and complex class libraries.In order to improve the speed of compilation, an incremental construction framework can be used to compile the changed code files, not to compile the entire project every time. Incremental construction is a compilation strategy that only compiles the modified source code file after the last compilation.The following is the basic working principle of incremental construction framework: 1. Tracking file changes: Incrementing the construction framework will monitor the source code file and the change of the dependent library.It records the timestamp or hash value of each file and compares with the records in the last compilation. 2. Recognition change: When the file changes are detected, the incremental construction framework will marked the changing files as "dirty files".It can determine whether the file has been changed based on the modification time stamp, hash value or other inspection mechanisms of the file. 3. Re -compilation: Once the dirty files are marked, the incremental construction framework will only compile these dirty files and dependent files related to them.This can be achieved by building the internal mechanism of the system. 4. Update output: When the compilation is completed, the incremental construction framework will update the update file in the output directory.These files are the latest binary files that can be used to build items or use them as libraries. The advantage of using incremental construction framework: The use of incremental construction framework can bring the following advantages: 1. Improve the speed of compilation: Only compile the changed files to avoid re -constructing the entire project.This can greatly reduce compilation time and improve development efficiency. 2. Reduce resource consumption: Only compile and change files can also reduce the system resources (such as CPU and memory) required for compilation, so that developers can use resources more effectively on other tasks. 3. Improve the development cycle: Fast increase in incremental construction can make developers look at the effect of changes to the source code faster, thereby accelerating the iterative and debugging process. Example code: The following is a simple example code, showing how to use Apache Maven and Jrebel plugins to achieve incremental construction and automatically reload the update class: pom.xml file configuration: <build> <plugins> <!-Maven-compiler-plugin configuration-> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.1</version> <configuration> <source>1.8</source> <target>1.8</target> <fork>true</fork> <compilerArgs> <arg>-noverify</arg> </compilerArgs> </configuration> </plugin> <!-jrebel plugin configuration-> <plugin> <groupId>org.zeroturnaround</groupId> <artifactId>jrebel-maven-plugin</artifactId> <version>1.1.7</version> <executions> <execution> <id>generate-rebel-xml</id> <phase>process-resources</phase> <goals> <goal>generate</goal> </goals> </execution> </executions> </plugin> </plugins> </build> Through the above configuration, Maven will use incremental construction strategies during the compilation process.The Jrebel plug -in will automatically generate the Jrebel configuration file (Rebel.xml) to achieve automatic loading and reloading of Class. in conclusion: By using incremental construction frameworks, it can greatly shorten the compilation time of the Java class library and improve development efficiency.Regardless of the use of existing incremental construction tools, or using the construction system and plug -in, incremental construction technology is a key optimization of large Java projects.