Method _install

ZezeJava/ZezeJava/src/main/java/Zeze/Hot/HotManager.java:530–593

@param namespace module name @return HotModule @throws Exception error

(String namespace, HotTransaction txn)

	 * @throws Exception error
	 */
	private HotModule _install(String namespace, HotTransaction txn) throws Exception {
		var moduleSrc = Path.of(distributeDir, namespace + ".jar").toFile();
		var interfaceSrc = Path.of(distributeDir, namespace + ".interface.jar").toFile();
		if (!moduleSrc.exists() || !interfaceSrc.exists())
			throw new RuntimeException("distributes not ready.");

		// 安装 interface
		var interfaceDst = Path.of(workingDir, "interfaces", namespace + ".interface.jar").toFile().getCanonicalFile();
		{
			var oldI = jars.remove(interfaceDst);
			if (null != oldI)
				oldI.close();
		}
		var interfaceDstBackup = Path.of(workingDir, "interfaces", namespace + ".interface.jar.backup").toFile();
		if (!interfaceDst.renameTo(interfaceDstBackup))
			throw new RuntimeException("backup interface.jar fail. " + interfaceDst + " -> " + interfaceDstBackup);
		// 从备份恢复，并且重新加载旧文件。
		txn.whileRollback(() -> {
			if (interfaceDstBackup.renameTo(interfaceDst))
				putJar(interfaceDst);
			else
				logger.error("restore interface backup fail {} -> {}", interfaceDstBackup, interfaceDst);
		});
		// 提交的时候删除备份
		txn.whileCommit(() -> Files.deleteIfExists(interfaceDstBackup.toPath()));
		throwIfMatch("install1");

		if (!interfaceSrc.renameTo(interfaceDst))
			throw new RuntimeException("rename fail. " + interfaceSrc + "->" + interfaceDst);
		putJar(interfaceDst);
		txn.whileRollback(() -> {
			if (!interfaceDst.renameTo(interfaceSrc))
				logger.error("uninstall interface {} -> {} fail", interfaceDst, interfaceSrc);
		});
		throwIfMatch("install2");

		// 安装 module
		var moduleDst = Path.of(workingDir, "modules", namespace + ".jar");
		var moduleDstBackup = Path.of(workingDir, "modules", namespace + ".jar.backup").toFile();
		if (!moduleDst.toFile().renameTo(moduleDstBackup))
			throw new RuntimeException("backup module.jar fail. " + moduleDst + " -> " + moduleDstBackup);

		txn.whileRollback(() -> {
			if (!moduleDstBackup.renameTo(moduleDst.toFile()))
				logger.error("restore module backup fail {} -> {}", moduleDstBackup, moduleDst);
			// module.jar 不用预先装载，在旧HotModule重启的时候会用本来的文件名重新打开。
		});
		txn.whileCommit(() -> Files.deleteIfExists(moduleDstBackup.toPath()));
		throwIfMatch("install3");

		var moduleDstFile = moduleDst.toFile();
		if (!moduleSrc.renameTo(moduleDstFile))
			throw new RuntimeException("rename fail. " + moduleSrc + "->" + moduleDst);

		txn.whileRollback(() -> {
			if (!moduleDstFile.renameTo(moduleSrc))
				logger.error("uninstall module {} -> {} fail", moduleDstFile, moduleSrc);
		});