Ngrinder 源码之Maven 项目

Ngrinder支持Maven结构的测试脚本。使用ScriptHandlerFactory来个脚本选择处理器handler，目前有JythonScriptHandler， GroovyScriptHandler和GroovyMavenProjectHandler三种。 ScriptHandlerFactory初始化的时候会按各个handler的order和displayOrder排序（升序）。

    public void init() {
        // Sort by the order of scriptHandlers..
        Collections.sort(scriptHandlers, new Comparator<ScriptHandler>() {
            @Override
            public int compare(ScriptHandler o1, ScriptHandler o2) {
                return o1.order().compareTo(o2.order());
            }
        });
 
        // Sort by the order of scriptHandlers..
 
        visibleHandlers = newArrayList();
        for (ScriptHandler each : this.scriptHandlers) {
            if (!(each instanceof NullScriptHandler)) {
                visibleHandlers.add(each);
            }
        }
        Collections.sort(visibleHandlers, new Comparator<ScriptHandler>() {
            @Override
            public int compare(ScriptHandler o1, ScriptHandler o2) {
                return o1.displayOrder().compareTo(o2.displayOrder());
            }
        });
 
    }
然后选择handler的时候按order升序，找到第一个canHandler为true的处理器返回。

    public ScriptHandler getHandler(FileEntry fileEntry) {
        for (ScriptHandler handler : scriptHandlers) {
            if (handler.canHandle(fileEntry)) {
                return handler;
            }
        }
        // Actually nothing is reach here.
        throw processException("no matching handler for " + fileEntry.getPath());
    }

MavenScriptProjectHandler 判断canhandle就是看根目录下有没有.pom文件

return getFileEntryRepository().hasOne(fileEntry.getCreatedUser(), getBasePath(path) + "/pom.xml");

Maven项目运行时，maven里面依赖的包会自动拷贝到./lib文件夹下

    @Override
    protected void prepareDistMore(Long testId, User user, FileEntry script, File distDir,
                                   PropertiesWrapper properties, ProcessingResultPrintStream processingResult) {
        String pomPathInSVN = PathUtils.join(getBasePath(script), "pom.xml");
        MavenCli cli = new MavenCli();
        processingResult.println("\nCopy dependencies by running 'mvn dependency:copy-dependencies"
                + " -DoutputDirectory=./lib -DexcludeScope=provided'");
 
        int result = cli.doMain(new String[]{ // goal specification
                "dependency:copy-dependencies", // run dependency goal
                "-DoutputDirectory=./lib", // to the lib folder
                "-DexcludeScope=provided" // but exclude the provided
                // library
        }, distDir.getAbsolutePath(), processingResult, processingResult);
        boolean success = (result == 0);
        if (success) {
            processingResult.printf("\nDependencies in %s was copied.\n", pomPathInSVN);
            LOGGER.info("Dependencies in {} is copied into {}/lib folder", pomPathInSVN, distDir.getAbsolutePath());
        } else {
            processingResult.printf("\nDependencies copy in %s is failed.\n", pomPathInSVN);
            LOGGER.info("Dependencies copy in {} is failed.", pomPathInSVN);
        }
        // Then it's not necessary to include pom.xml anymore.
        FileUtils.deleteQuietly(new File(distDir, "pom.xml"));
        processingResult.setSuccess(result == 0);
    }

这里有两个注意的地方。
1) Ngrinder使用MavenCli来运行maven命令，所以跟本机的maven环境不一样，如果有特殊的maven setting要配置的话要手动给maven指定setting.xml的位置。

public static final File DEFAULT_GLOBAL_SETTINGS_FILE =
        new File( System.getProperty( "maven.home", System.getProperty( "user.dir", "" ) ), "conf/settings.xml" );

ngrinder通过获取环境变量maven.home来查找setting.xml， 可以启动的时候加参数-Dmaven.home=xxxxx来指定maven 的配置。

2) Ngrinder会把pom文件里面的provided scope的依赖包自动过滤掉，所以对于一些会导致包冲突的artifact可以用scope来exclude掉。

标签：xml,maven,pom,handler,Maven,源码,Ngrinder,ScriptHandler,processingResult
来源： https://www.cnblogs.com/xidianzxm/p/11606485.html