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本文主要研究一下PowerJob的ContainerTemplateGenerator
ContainerTemplateGenerator
tech/powerjob/server/core/container/ContainerTemplateGenerator.java
代码语言：javascript复制public class ContainerTemplateGenerator {
private static final String ORIGIN_FILE_NAME = "oms-template-origin";
/**
* 生成 container 的模版文件
* @param group pom group标签
* @param artifact pom artifact标签
* @param name pom name标签
* @param packageName 包名
* @param javaVersion Java版本
* @return 压缩包
* @throws IOException 异常
*/
public static File generate(String group, String artifact, String name, String packageName, Integer javaVersion) throws IOException {
String workerDir = OmsFileUtils.genTemporaryWorkPath();
File originJar = new File(workerDir "tmp.jar");
String tmpPath = workerDir "/unzip/";
// CentOS 7 上 getResource 会报 FileNotFoundException，原因不详...
try (InputStream is = ContainerTemplateGenerator.class.getClassLoader().getResourceAsStream(ORIGIN_FILE_NAME ".zip")) {
Objects.requireNonNull(is, "generate container template failed, can't find zip file in classpath.");
FileUtils.copyInputStreamToFile(is, originJar);
}
ZipFile zipFile = new ZipFile(originJar);
zipFile.extractAll(tmpPath);
String rootPath = tmpPath ORIGIN_FILE_NAME;
// 1. 修改 pom.xml （按行读，读取期间更改，然后回写）
String pomPath = rootPath "/pom.xml";
String line;
StringBuilder buffer = new StringBuilder();
try (BufferedReader br = new BufferedReader(new FileReader(pomPath))) {
while ((line = br.readLine()) != null) {
if (line.contains("<groupId>groupId</groupId>")) {
buffer.append(" <groupId>").append(group).append("</groupId>");
}else if (line.contains("<artifactId>artifactId</artifactId>")) {
buffer.append(" <artifactId>").append(artifact).append("</artifactId>");
}else if (line.contains("<name>name</name>")) {
buffer.append(" <name>").append(name).append("</name>");
}else if (line.contains("<maven.compiler.source>")) {
buffer.append(" <maven.compiler.source>").append(javaVersion).append("</maven.compiler.source>");
}else if (line.contains("<maven.compiler.target>")) {
buffer.append(" <maven.compiler.target>").append(javaVersion).append("</maven.compiler.target>");
} else {
buffer.append(line);
}
buffer.append(System.lineSeparator());
}
}
OmsFileUtils.string2File(buffer.toString(), new File(pomPath));
// 2. 新建目录
String packagePath = StringUtils.replace(packageName, ".", "/");
String absPath = rootPath "/src/main/java/" packagePath;
FileUtils.forceMkdir(new File(absPath));
// 3. 修改 Spring 配置文件
String resourcePath = rootPath "/src/main/resources/";
String springXMLPath = resourcePath ContainerConstant.SPRING_CONTEXT_FILE_NAME;
buffer.setLength(0);
try (BufferedReader br = new BufferedReader(new FileReader(springXMLPath))) {
while ((line = br.readLine()) != null) {
if (line.contains("<context:component-scan base-package="")) {
buffer.append(" <context:component-scan base-package="").append(packageName).append(""/>");
}else {
buffer.append(line);
}
buffer.append(System.lineSeparator());
}
}
OmsFileUtils.string2File(buffer.toString(), new File(springXMLPath));
// 4. 写入 packageName，便于容器加载用户类
String propertiesPath = resourcePath ContainerConstant.CONTAINER_PROPERTIES_FILE_NAME;
String properties = ContainerConstant.CONTAINER_PACKAGE_NAME_KEY "=" packageName;
OmsFileUtils.string2File(properties, new File(propertiesPath));
// 5. 再打包回去
String finPath = tmpPath "template.zip";
ZipFile finZip = new ZipFile(finPath);
finZip.addFolder(new File(rootPath));
// 6. 删除源文件
FileUtils.forceDelete(originJar);
return finZip.getFile();
}
}ContainerTemplateGenerator的generate方法提供了生成外置动态加载的代码模版，它从classpath读取oms-template-origin.zip文件，然后解压到临时目录，之后按行读取pom.xml文件，替换掉group、name、javaVersion信息，接着在src/main/java下面写入包名对应的目录，然后替换src/main/resources/oms-worker-container-spring-context.xml中base-package的包名，在oms-worker-container.properties中写入PACKAGE_NAME，然后重新打包为template.zip
downloadContainerTemplate
tech/powerjob/server/web/controller/ContainerController.java
代码语言：javascript复制 @PostMapping("/downloadContainerTemplate")
public void downloadContainerTemplate(@RequestBody GenerateContainerTemplateRequest req, HttpServletResponse response) throws IOException {
File zipFile = ContainerTemplateGenerator.generate(req.getGroup(), req.getArtifact(), req.getName(), req.getPackageName(), req.getJavaVersion());
OmsFileUtils.file2HttpResponse(zipFile, response);
}downloadContainerTemplate方法调用的就是ContainerTemplateGenerator.generate来生成模版代码
小结
PowerJob的ContainerTemplateGenerator的generate方法提供了生成外置动态加载的代码模版，它主要是新建包目录，替换了里头的pom.xml以及src/main/resources/oms-worker-container-spring-context.xml中base-package的包名，在oms-worker-container.properties中写入PACKAGE_NAME。
