构建缓存与增量编译

  第一次 mvn package(依赖与插件已在本地仓库)    3.1 秒
  第二次 mvn package(什么都没改)         2.8 秒  ['Nothing to compile - all classes are up to date.', 'Nothing to compile - all classes are up to date.', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.528 s -- in demo.AllTest', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0']
  只改 C3.java 之后 mvn package           3.1 秒  ['Compiling 8 source files with javac [debug release 21] to target/classes', 'Compiling 1 source file with javac [debug release 21] to target/test-classes', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.531 s -- in demo.AllTest', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0']
  mvn clean package                      3.1 秒  ['Compiling 8 source files with javac [debug release 21] to target/classes', 'Compiling 1 source file with javac [debug release 21] to target/test-classes', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.530 s -- in demo.AllTest', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0']
  mvn package -Dmaven.test.skip=true(不编译测试也不跑)     1.0 秒

  第一次(存入缓存)clean verify            3.2 秒  ['Attempting to restore project demo:shopapp from build cache', 'Compiling 8 source files with javac [debug release 21] to target/classes', 'Compiling 1 source file with javac [debug release 21] to target/test-classes', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.537 s -- in demo.AllTest', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0', 'Saved Build to local file: <实验目录>']
  本地缓存目录:2 个文件,共 14 KB;顶层 ['v1.1']
  第二次 clean verify(命中缓存)          1.2 秒  ['Attempting to restore project demo:shopapp from build cache', 'Found cached build, restoring demo:shopapp from cache by checksum cac438de9184007e0a70dc3795e022cbb0a1add0499b5f7ba4ccdd31b6e42855']
  命中缓存时被跳过的插件执行: ['resources:resources', 'compiler:compile', 'resources:testResources', 'compiler:testCompile', 'surefire:test', 'jar:jar'] ;日志里出现 Tests run 吗: False
  改 C5.java 之后 clean verify(未命中)    3.2 秒  ['Attempting to restore project demo:shopapp from build cache', 'Compiling 8 source files with javac [debug release 21] to target/classes', 'Compiling 1 source file with javac [debug release 21] to target/test-classes', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.537 s -- in demo.AllTest', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0', 'Saved Build to local file: <实验目录>']
  再来一次 clean verify(新版本已缓存)    1.2 秒  ['Attempting to restore project demo:shopapp from build cache', 'Found cached build, restoring demo:shopapp from cache by checksum 1dc4a5afea92a9b868998c2cf3b703a566dc9f57b02e7c899786d6d4aea1d53c', 'Skipping plugin execution (cached): resources:resources', 'Skipping plugin execution (cached): compiler:compile', 'Skipping plugin execution (cached): resources:testResources', 'Skipping plugin execution (cached): compiler:testCompile']
  同样的命令但 -Dmaven.build.cache.enabled=false    3.2 秒  ['Cache disabled by command line flag, project will be built fully and not cached', 'Compiling 8 source files with javac [debug release 21] to target/classes', 'Compiling 1 source file with javac [debug release 21] to target/test-classes', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.539 s -- in demo.AllTest', 'Tests run: 1, Failures: 0, Errors: 0, Skipped: 0']
  缓存目录现有 4 个文件;其中 buildinfo.xml 个数 2
  buildinfo.xml 里的关键字段: ['hashFunction', 'artifact', 'executions'] ;大小 10519 字符